Quick Answer
There is no reliable universal 100kW on-grid inverter price in India. Compare dated, itemized quotations for the exact model and complete commissioned scope. Normalize GST, freight, unloading, controls, protection, SCADA, testing, warranty remedy, spares, and service. Approve the purchase only after the inverter passes project-specific DC, AC, PCC, thermal, and grid-compliance checks.
A 100kW on-grid inverter price in India is meaningful only when the buyer defines what the quoted amount must deliver. A bare inverter at a warehouse differs from one delivered to a factory. A commissioned package at the plant’s point of common coupling is another purchase. Their prices should not be compared as if they were equal.
Industrial buyers also face a topology choice. One 100 kW class string inverter can reduce equipment count, while several smaller units can divide roof zones and limit the output lost during one failure. The lower purchase price can therefore create the higher operating risk. The right decision depends on the site, not a national price table.
This guide sets out a tender method for procurement teams, plant engineers, engineering, procurement, and construction contractors, and asset owners. It does not publish an unsupported rupee range. Start with the full 100 kW solar plant cost guide if the entire plant is still being budgeted. Use the industrial EPC comparison guide when the inverter is part of a turnkey contract.
Quick Answer
There is no reliable universal 100kW on-grid inverter price in India. Compare dated, itemized quotations for the exact model and complete commissioned scope. Normalize GST, freight, unloading, controls, protection, SCADA, testing, warranty remedy, spares, and service. Approve the purchase only after the inverter passes project-specific DC, AC, PCC, thermal, and grid-compliance checks.
In this guide:
- How to define the priced object before asking suppliers for a quote
- How to compare one 100 kW unit with distributed smaller units
- Which DC, MPPT, AC, PCC, protection, and thermal checks belong in the tender
- How export control, communications, and SCADA change the commissioned cost
- Which India compliance documents require exact-model verification
- How to compare warranty remedy, spares, response time, and lifecycle cost
- How to run a bid-leveling exercise and close factory and site acceptance
What Is a Defensible 100kW On-Grid Inverter Price in India?
A defensible price is the total evaluated cost of an exact, compatible, commissioned, documented, and supportable inverter package. It has a quotation date, delivery location, tax basis, scope boundary, validity period, payment milestones, and signed deviations. It is not a screenshot, an online dealer figure, or an unqualified price per watt.
The buyer should define the meaning of 100 kW. It may mean active AC output, 100 kVA of apparent power, a “100K” model name, or an aggregate rating. Those values can differ. Reactive-power operation, temperature derating, grid voltage, and manufacturer definitions can also change usable active power.
The phrase “inverter price” often hides 4 different commercial boundaries:
- Bare equipment: inverter only, normally without site services or external controls.
- Delivered equipment: inverter plus packaging, freight, transit insurance, and delivery to an agreed point.
- Installed package: delivered equipment plus mounting, cabling terminations, auxiliaries, and installation labour.
- Commissioned and supported package: installed package plus settings, grid and export-control tests, SCADA integration, training, handover records, warranty registration, spares, and contracted service.
Only the fourth boundary lets an industrial owner compare the cost of reaching operation. Even then, the tender must state which upstream and downstream equipment remains in the engineering, procurement, and construction contractor’s scope.
Procurement rule
Never issue a request that says only “100 kW on-grid inverter required.” Attach a schedule covering equipment, controls, tests, documents, logistics, and service.
Why a national rupee range is unreliable
Inverter offers move with the exact series, stock position, currency exposure, order volume, channel level, credit terms, delivery distance, tax treatment, and service commitment. Two offers with the same headline capacity can contain different equipment. Compare tracker counts, input-current limits, communications, export controls, surge-protection arrangements, and warranty remedies.
A quote may look cheaper because it excludes the data logger, energy meter, weather station interface, remote-monitoring licence, commissioning visit, freight, unloading, or replacement labour. Another supplier may bundle those items. Publishing one number without these boundaries creates false precision.
This is why the answer to “what is the current price?” should be a current tender exercise. Ask at least 3 technically qualified bidders to answer the same schedule. Record the date and validity of every offer. If procurement takes longer than the validity window, obtain a written refresh before award.
Build One Price Boundary Before Comparing Bids
The owner should issue one commercial schedule that separates every material cost. A bidder may enter zero where an item is included elsewhere, but it should not leave a line blank. Blank lines become variation claims after the purchase order.
| Price line | What the bidder must state | Common comparison error |
|---|---|---|
| Exact inverter model | Full model code, hardware revision, country of origin, and quantity | Comparing a family name with an exact model |
| Base equipment | Inverter and factory-supplied standard parts | Assuming optional switches or connectors are included |
| Data and controls | Logger, meter, gateway, export controller, licences, SIM, and cloud terms | Treating monitoring as free for the asset life |
| External protection | AC and DC devices outside the inverter, panels, relays, and interfaces | Counting an internal device twice or omitting an external one |
| Communications | RS485, Ethernet, fibre converters, cables, switches, and protocol mapping | Assuming “Modbus ready” means commissioned SCADA integration |
| Logistics | Packaging, freight, transit insurance, unloading, lifting, and storage | Comparing ex-warehouse and delivered prices |
| Site services | Supervision, installation, settings, testing, and commissioning | Assuming a remote phone call equals commissioning |
| Documentation | Datasheets, certificates, manuals, drawings, settings, reports, and as-builts | Accepting generic brochures instead of project records |
| Training | Operator and maintenance sessions, materials, and attendance records | Leaving training until the end of the project |
| Warranty | Term, remedy, labour, travel, freight, lifting, and re-commissioning | Comparing years rather than the cost to restore operation |
| Spares | Mandatory and optional spares, price validity, storage conditions, and lead time | Buying a spare without firmware and commissioning support |
| Service | Response, remote diagnosis, site attendance, restoration, escalation, and reporting | Accepting “best effort” with no measurable milestone |
| Tax and finance | GST basis, input-credit assumptions, withholding, credit days, and interest | Mixing tax-inclusive and tax-exclusive bids |
| Exclusions | Every owner, EPC, and third-party responsibility | Discovering exclusions after equipment delivery |
The tender should state the Incoterm or delivery basis in plain language even for domestic supply. Define the exact delivery point, who unloads, who provides the crane or forklift, who inspects shipping damage, and when risk transfers. An inverter delivered at a security gate is not the same as an inverter placed on its final plinth or wall.
Price validity and change control
Set a quotation validity period and require a formula for any permitted escalation. Avoid open wording such as “price may change based on market conditions.” Name any permitted currency or commodity index. Also state its base date, adjustment interval, and cap.
Freeze the exact model at award. A substitution should need written technical and commercial approval. The substitute must repeat every affected calculation and document check. The supplier should disclose any change to connectors, current limits, firmware, communication hardware, certificates, cooling method, dimensions, weight, or warranty process.
The purchase order should also define what happens if the quoted model becomes unavailable. A right to propose an “equivalent” unit is too broad. Equivalence must be proven against the approved data schedule, and the owner should retain the right to reject it without cost.
One 100 kW Inverter or Distributed Smaller Units?
Neither architecture wins every project. A single unit can reduce equipment count and communication interfaces. Distributed units can align with separate roof blocks and preserve some output during a fault. The tender should request both options when the site supports both, then compare annual energy, electrical work, downtime exposure, and lifecycle support.
| Decision factor | One 100 kW class unit | Distributed smaller units |
|---|---|---|
| Failure consequence | One inverter fault can remove the full connected block | One fault normally removes only its assigned block |
| Roof zoning | Long DC routes may be required when arrays are dispersed | Units can sit closer to separate array groups |
| AC distribution | Fewer inverter feeders | More feeders, breakers, and terminations |
| MPPT allocation | Depends on one model’s tracker and input arrangement | Trackers can be assigned by roof or operating group |
| Maintenance access | One main service location | More equipment locations to inspect |
| Communications | Fewer devices and data addresses | More devices, addresses, and network points |
| Spare strategy | A full power-stage spare may be expensive or impractical | One common smaller spare may cover several positions |
| Partial availability | Limited when the unit is out of service | Remaining units may continue if the system is designed for it |
| Expansion | May require another large block | Smaller blocks can be added in stages, subject to approvals |
| Commercial comparison | Fewer equipment lines | More units, but possibly lower restoration exposure |
The decision should use the plant’s downtime value. A warehouse with stable daytime demand may tolerate one outage differently from a process facility whose solar system participates in export control or demand management. The owner should state the value of lost generation and any production interaction, then include it in the evaluated cost.
A transparent downtime calculation
Use a hypothetical calculation, not an invented case study. Assume option A has one inverter serving the full block. Option B has 4 equal units. If one unit in option B is unavailable, 75 percent of that block’s nominal inverter capacity remains available, subject to plant controls and other constraints. If option A fails, none of its connected DC power can convert until restoration.
The calculation still needs site-specific energy profiles. Lost energy is not nameplate power multiplied by 24 hours. Use the expected hourly or sub-hourly generation during the outage window. Apply clipping, curtailment, grid availability, and the actual repair duration. Then multiply only the lost, usable energy by the applicable economic value.
This analysis often changes the award. The lower equipment quote may not remain cheaper after expected downtime, spare holding, extra switchgear, and service response are included.
Verify DC Strings and MPPTs Before Accepting a Price
The maximum power point tracker, or MPPT, controls a group of photovoltaic strings around its best operating point. A tender must prove that the offered inverter’s trackers, inputs, voltage limits, and current limits suit the selected modules and array groups. Read the MPPT definition and design role before approving a schedule built only around total kilowatts.
A supplier should return a string schedule for each inverter. The schedule should identify the module model and quantity per string. It should map strings to inputs, trackers, roof groups, orientation, tilt, shade class, cable route, and polarity. Link every value to the exact module and inverter documents used.
Cold-voltage gate
Module open-circuit voltage rises as cell temperature falls. The engineer should calculate the maximum string open-circuit voltage at the project’s lowest design cell temperature, using the module’s stated temperature coefficient. The result must remain within the inverter’s maximum DC voltage and all connected equipment limits.
Do not use the annual average temperature. Use the project’s design basis and record the source. Add the required engineering margin under the applicable standard, authority, and company procedure. A string that passes at standard test conditions can fail the cold-voltage check.
Hot-voltage gate
Operating voltage falls as modules heat. The engineer should calculate the string’s expected operating voltage at the highest design cell temperature. That voltage must sit within the relevant MPPT operating range, including any full-power range stated by the manufacturer.
This distinction matters because a wide MPPT window does not necessarily mean full rated output across the whole window. Ask the bidder to identify the full-power voltage range separately. If the datasheet does not state it, require written manufacturer clarification tied to the exact model.
Current and short-circuit gate
Modern modules can carry higher operating and short-circuit currents than older designs. Check maximum operating current per input and per tracker. Check permitted short-circuit current separately. Confirm whether multiple strings share an input and how the manufacturer defines those limits.
Connector ratings, cable ratings, fuses, combiner equipment, and isolators must match the final design. Never accept “supports high-current modules” without the numbers and the exact calculation.
MPPT allocation gate
Put strings with similar orientation, tilt, shading, module type, and electrical behaviour on the same tracker unless an engineered exception is documented. Combining unlike groups can force the tracker toward a compromise operating point.
Use solar design software to maintain the layout, string schedule, inverter selection, and bill of materials in one controlled model. Run solar shadow analysis software before final tracker allocation when buildings, vents, equipment, parapets, or other obstructions affect the roof.
DC oversizing and clipping
The direct-current array rating may exceed the inverter’s alternating-current rating, but the acceptable ratio is project-specific. More DC capacity can improve inverter use during lower-irradiance hours. It can also increase clipping during high-output periods, raise input-current demands, and change thermal behaviour.
The tender should state the proposed DC-to-AC ratio, expected clipping method, weather source, simulation interval, module degradation assumption, availability, and curtailment. A supplier’s maximum permitted oversizing is a hardware limit or marketing statement, not an automatic design target.
Engineer the AC Side, PCC, and Protection as One System
The point of common coupling, or PCC, is the project’s defined grid-interaction point. A compatible inverter still fails if the AC network, switchgear, transformer, protection, or PCC controls do not suit it.
The owner should provide the latest single-line diagram, transformer data, switchboard ratings, and conductor details. Add fault information, protection settings, demand, metering, operating voltage, and planned plant changes. The engineer should verify records in the field where necessary.
AC current and conductor checks
Calculate output current using the offered inverter’s rated voltage, apparent-power limits, and power-factor operating requirements. Check cables and busbars for continuous current, grouping, ambient temperature, enclosure temperature, installation method, voltage drop, short-circuit withstand, termination ratings, and future loading.
The inverter terminal may accept a large conductor, but that does not prove the entire route is adequate. Record the selected cable, route length, installation condition, terminal method, and calculated losses. Include the final values in the as-built dossier.
Switchgear and isolation
The tender should identify every required breaker, switch, isolator, fuse, contactor, surge protective device, and protection relay. State whether each device is inside the inverter, factory-supplied separately, provided by the panel builder, or provided by the EPC.
Internal protection does not automatically replace an external device required by the electrical design, authority, or isolation procedure. Request a coordination table that names device ratings, curves or settings, interrupting capacity, discrimination objective, and the responsible designer.
Fault level and transformer interaction
Review the existing transformer’s rating, vector group, impedance, tap position, loading, and protection. Check the switchboard’s fault rating and any change at the PCC. For a deeper procurement check, use the commercial solar transformer sizing guide.
Inverter fault contribution differs from a synchronous generator. The engineer must use the manufacturer’s stated behaviour and an accepted study method. Do not apply a generic multiplier or assume zero contribution.
Protection settings and anti-islanding
Anti-islanding is the inverter’s action to stop energizing an electrical island after the qualifying grid supply is lost. The exact functions, thresholds, delays, reconnection logic, and coordination must match applicable rules and the distribution licensee’s approved settings.
The CEA distributed-generation connectivity regulations provide national technical context. The project must also follow the current state, distribution-licensee, electrical-inspector, and connection-specific requirements. Obtain written approval rather than copying settings from another site.
Price Export Control, Communications, and SCADA Explicitly
Export control limits power flow at a defined measurement point. It requires more than an inverter menu setting. A working scheme can include a revenue-grade or control meter, current transformers, voltage signals, controller, communication path, fail-safe logic, inverter commands, protection, and witnessed tests.
Read the export-limit control guide before drafting this part of the tender. State whether the requirement is zero export, a fixed export ceiling, an import-maintenance target, or another approved operating rule. Define the measurement point and permitted response.
Questions for the export-control bidder
- Which meter, current transformers, controller, and logger are required?
- Which party supplies, installs, configures, seals, and tests them?
- What happens after meter, controller, communication, or inverter failure?
- Does the scheme fail to a safe output limit, stop generation, or continue at the last command?
- What is the response and settling requirement accepted by the distribution licensee?
- How are multiple inverters coordinated?
- How is reverse power tested without risking the facility process?
- Which settings are password-protected, and who owns the credentials?
- Which alarms reach the operator, and how are they escalated?
Avoid one unsupported response-time number in a generic national tender. The distribution licensee and project engineer should define the applicable acceptance limit. The supplier should prove it during a witnessed site test.
SCADA scope
Supervisory control and data acquisition, or SCADA, is the monitoring and control layer used by operators. “SCADA compatible” is not a deliverable. Require a point list, protocol, register map, update rate, timestamps, units, scaling, quality flags, alarms, commands, user roles, network architecture, and test procedure.
The SCADA for solar reference explains the boundary between inverter data and plant-level operations. Your tender should state whether the inverter connects to an owner SCADA, an EPC gateway, a manufacturer cloud, or more than one system.
At minimum, decide whether the owner needs:
- DC voltage and current by input, string, or tracker where supported
- AC voltage, current, power, reactive power, power factor, and frequency
- daily and lifetime energy values with a defined reset and retention method
- operating state, derating state, alarms, warnings, and trip codes
- grid and protection settings with read or write permissions
- export-controller values and command status
- enclosure, heat-sink, or internal temperatures where exposed by the model
- firmware and hardware identification
- event timestamps synchronized to the owner standard
Cloud monitoring terms need a commercial review. Define licence duration, telecom charges, retention, exports, account ownership, access, password handover, data location, privacy, and exit rights. Include application programming interface access when required. The inverter should not become operationally opaque when a free portal plan changes.
Check Temperature, Derating, Enclosure, and Physical Access
Nameplate power does not guarantee continuous output at every site condition. Ask for the exact model’s power-temperature curve, voltage-dependent full-power range, altitude limits, cooling method, clearance, air-flow requirements, acoustic data where relevant, and environmental restrictions.
Temperature and altitude
Compare ambient temperature with the temperature at the installed location. A shaded, ventilated wall and a sun-exposed metal enclosure create different operating conditions. Roofs near process exhausts, cooling towers, or hot equipment need a separate review.
Do not quote a generic derating percentage. Use the offered model’s current document and the project’s design temperatures. Model the expected hourly effect on available AC power. If altitude derating applies, include it in the same calculation.
Enclosure and corrosion
An ingress-protection rating addresses defined dust and water tests. It does not prove suitability for direct sun, flooding, salt, ammonia, chemical vapour, condensation, or a specific corrosive process environment. Ask the manufacturer to state installation restrictions and warranty exclusions for the actual location.
Provide a canopy only if the manufacturer permits it and the design maintains required airflow, heat rejection, clearances, access, and fire safety. A badly designed enclosure can raise temperature and worsen the condition it was meant to solve.
Weight, lifting, and maintenance space
Record packaged and unpackaged dimensions and weights. Define the delivery route, doorway and stair limits, roof access, lifting points, crane or hoist plan, temporary storage, and final mounting method. Confirm that maintenance panels, fans, filters, terminals, and replaceable parts remain accessible.
The tender should price a future removal path. If replacement needs a crane, shutdown, scaffold, roof opening, or special permit, include those costs in the warranty and lifecycle review.
Build an India Compliance Evidence Gate
Compliance should be checked against the exact model, the current legal position, the project connection, and the procurement date. A logo on a brochure is not enough. The owner needs traceable records linking the offered hardware and software to valid documents.
The Bureau of Indian Standards Scheme II page lists solar product categories and notified standards. Its inverter entries include safety and anti-islanding references. The BIS uniform test-report page also lists inverter test references, including IS 16169:2019 for islanding prevention and IS 17980:2022 for MPPT efficiency.
The tender team should verify:
- exact model code and every suffix
- registered manufacturer and factory identity
- standard number and edition
- registration, licence, or report number as applicable
- issue, validity, and expiry dates
- laboratory and accreditation details
- model-family or series coverage
- hardware and firmware applicability
- listed ratings and operating modes
- any conditions, exclusions, or later amendments
The MNRE 2025 series-approval notice is useful dated context for inverter testing under the goods order. It was a draft-guideline consultation notice. Do not treat that page alone as final proof that a particular model is accepted for a project.
ALMM does not certify inverters
The MNRE Approved List of Models and Manufacturers concerns photovoltaic modules and cells. It does not rank, list, or certify solar inverters. Reject a bid that uses “ALMM-listed inverter” as proof.
Module procurement may still need an ALMM review when the project or scheme requires it. Keep that check in the module schedule. Do not transfer it to the inverter.
Electrical safety evidence
The CEA safety regulations, 2023 include solar provisions covering lightning and overvoltage protection, combiner overcurrent and isolation protection, earth-fault protection, and insulation monitoring. The project engineer should map the applicable provisions to the design, supplied devices, settings, inspection, and test records.
This article cannot replace the distribution licensee’s current process or a qualified engineer’s approval. State rules, supply voltage, metering arrangement, plant capacity, export mode, inspector jurisdiction, and connection agreement can change the required submissions and tests.
Compare Warranty Remedy, Spares, and Service SLA
A long warranty headline does not tell the owner how generation will be restored. Compare the remedy in writing. A parts-only warranty can leave the owner paying diagnosis, travel, freight, lifting, replacement labour, reinstallation, settings, and recommissioning.
Warranty schedule
Require the bidder to answer each item:
- warranty provider’s exact legal entity and service contact
- start date, registration process, and required commissioning records
- covered inverter, accessories, logger, controller, meter, and communications hardware
- covered parts, labour, travel, freight, removal, lifting, and reinstallation
- repair, advance replacement, or return-to-depot remedy
- ownership of replaced equipment and defective parts
- exclusions for grid events, environment, installation, firmware, and third-party control
- proof required for a claim and maximum time to acknowledge it
- remote diagnosis, site attendance, restoration, and closure milestones
- effect of approved firmware updates, spare replacement, or system expansion
- warranty transfer when the asset owner changes
- remedy if the provider or local service partner changes
Service-level agreement
An SLA, or service-level agreement, should define measurable times from a timestamped event. Separate response, diagnosis, site attendance, temporary restoration, final restoration, and root-cause report. A 2-hour response that only confirms receipt has little operational value.
Set severity classes. A full outage, repeated protection trip, export-control failure, communication loss, and cosmetic defect should not share one deadline. Define business hours, holidays, remote-access conditions, site-entry rules, and escalation contacts.
The supplier should state service locations, staff or partner model, diagnostic tools, and spare stock. Verify these statements during bid evaluation. Do not convert a map or sales promise into assumed coverage.
Spare strategy
The right spare package depends on topology and repair method. It may include communication boards, fans, filters, surge protective devices, connectors, auxiliary supplies, control boards, or a complete inverter. Obtain manufacturer storage conditions, shelf-life constraints, firmware requirements, and replacement procedures.
A spare that cannot be commissioned without a remote vendor account is not independently usable. Define who holds credentials, who can authorize replacement, and how a spare is kept compatible with the live fleet.
Compare Lifecycle Cost, Not Only Purchase Price
Lifecycle cost adds purchase, integration, operating, failure, and replacement effects over the evaluation period. It should include only transparent inputs. Do not hide uncertain values behind one unexplained net-present-cost result.
Use the generation and financial tool to compare the energy and cash-flow effect of topology, clipping, derating, availability, and replacement assumptions. Keep the commercial model linked to the approved engineering case.
A practical evaluation can include:
| Cost or value | Evidence needed | Treatment |
|---|---|---|
| Initial package price | Signed itemized quote | Use the normalized tax and delivery basis |
| External equipment | Approved bill of materials | Add items excluded from the inverter quote |
| Installation and commissioning | EPC work breakdown | Include shutdown, lifting, and tests |
| Monitoring and data | Licence and telecom schedule | Include renewals over the evaluation period |
| Planned maintenance | Manufacturer and O&M schedule | Include labour, access, and consumables |
| Spare holding | Spare list and commercial offer | Include storage and obsolescence risk |
| Expected downtime | Energy profile and restoration assumptions | Test more than one failure case |
| Replacement exposure | Warranty remedy and service evidence | Show covered and owner-paid cases |
| Efficiency and clipping | Reproducible simulation | Use the exact model and array |
| Residual value | Documented policy | Use zero when no evidence supports a value |
Hypothetical bid-leveling example
Assume 3 bids arrive. This is a method example, not a market price statement.
- Bid A includes the inverter, logger, export controller, commissioning, and 2 site visits. Freight and unloading are excluded.
- Bid B includes delivery and unloading, but excludes the export meter, SCADA mapping, and replacement labour.
- Bid C includes the full delivered and commissioned package, a spare communication board, and a defined restoration SLA.
First, place every bid into the same price schedule. Add a budgetary allowance only where procurement has written evidence. Mark uncertain exclusions as commercial risk, not zero. Next, apply technical pass or fail gates. A low price cannot compensate for failed voltage, current, PCC, certificate, or protection requirements.
Then score only the technically compliant bids. Weighting can cover evaluated cost, annual energy, partial availability, warranty remedy, service capability, documentation, delivery, and contractual deviations. Publish the scoring rules before opening commercial bids when the organization’s procurement policy requires it.
The final recommendation should show why the selected bid creates the lowest risk-adjusted cost. It should also list unresolved assumptions and the person authorized to close each one.
Issue an Owner-Controlled Tender Schedule
The request for proposal should make missing information visible. Give every bidder the same workbook or returnable schedule. Lock cells where the owner defines a requirement. Use a deviation column beside every technical and commercial clause.
Part 1: owner data
Provide available electricity bills, interval-load data, demand, operating shifts, and planned expansion. Add transformer and switchboard records, the single-line diagram, fault and protection information, and export requirements. Include site conditions, layout, access, communications, cybersecurity, and shutdown windows.
Label the reliability of each input. “As-built drawing available” and “old drawing to be field-verified” are different design bases. Require bidders to list surveys and studies needed before final approval.
Part 2: bidder technical return
Request the exact model datasheet, manual, certificates, test reports, declaration, and firmware information. Add the DC, MPPT, AC, derating, loss, protection, communications, export-control, SCADA, physical, and auxiliary-power schedules.
Require the bidder to identify every feature that depends on an optional device, licence, firmware version, cloud service, or third-party component. Optional functions should not appear in a compliance response unless priced and included.
Part 3: bidder commercial return
Use the itemized price boundary from this guide. Include payment milestones, validity, taxes, delivery, delays, liquidated damages where approved, bank guarantees if required, insurance, warranty remedy, spares, SLA, training, documentation, and exclusions.
Tie payments to evidence. Reasonable milestones can include approved documents, successful factory checks where specified, verified delivery, mechanical completion, energized tests, acceptance, and complete handover. The legal team should approve the final structure.
Part 4: deviation schedule
State that silence means compliance only if procurement policy permits that interpretation. A safer method requires a signed response to every clause. No bidder should bury exceptions in a brochure, email, or quotation footnote.
After technical clarification, freeze the final deviation schedule. Incorporate it into the purchase order. Oral promises should not influence award.
Keep the tender model and proposal aligned
Build the approved array, inverter, yield, and financial case before turning it into a controlled customer or investment document.
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Use solar proposal software only after the technical and financial assumptions are controlled. A polished proposal cannot correct an unverified inverter or an incomplete tender boundary.
How to Review a Qbits 100 kW Class Offer
Qbits Energy is a related portfolio company. Its official catalogue publishes 100 kW class on-grid series, but the page is a manufacturer-published source, not independent evidence. Availability, exact specifications, compliance, warranty, price, and service must be confirmed for the offered model and project.
Review the Qbits on-grid inverter catalogue. Request the exact datasheet, manual, certificates, model-specific test evidence, commercial offer, warranty terms, service plan, and project references. Do not transfer a specification from another rating in the same family.
Disclosure: SurgePV and Qbits Energy have a commercial relationship. This guide does not independently test or rank Qbits products. Apply the same pass or fail gates, tender schedule, reference checks, and lifecycle-cost method to Qbits and every other bidder.
A Qbits offer should pass these gates before commercial scoring:
- Exact model and hardware revision are identified.
- Cold and hot string calculations pass with the selected modules.
- Input current, short-circuit current, connectors, and MPPT allocation pass.
- Rated AC output and any derating suit the site and grid voltage.
- PCC, protection, anti-islanding, and reconnection requirements pass.
- Export-control hardware and failure behaviour are defined where needed.
- SCADA points, protocol, credentials, and data terms are accepted.
- Exact-model compliance documents are valid and applicable.
- Logistics, installation, commissioning, and acceptance are priced.
- Warranty remedy, spares, response, attendance, and restoration are contracted.
If another supplier provides stronger compatible evidence or lower evaluated lifecycle cost, select that supplier. A portfolio relationship should never override the tender gates.
Close Factory and Site Acceptance Before Final Payment
Acceptance converts promises into evidence. The contract should distinguish document approval, factory checks, delivery inspection, installation checks, pre-energization tests, energized tests, reliability observation where required, and final handover.
Factory evidence
Factory acceptance scope depends on order value, risk, and procurement policy. It may include identity, routine-test, visual, firmware, hardware, accessory, communication, settings, and packaging checks. Agree any witness tests before manufacture.
Do not request a factory test that the supplier cannot perform or that has no acceptance criterion. Define method, instrument, tolerance, witness, record, and consequence of failure. Review third-party test reports separately from order-specific routine tests.
Delivery inspection
Check packaging, shock or tilt indicators where used, model, serial number, quantity, accessories, physical damage, storage requirements, and documents. Photograph condition before unloading and after placement. Record any damage before signing an unconditional delivery receipt.
Pre-energization checks
The responsible engineer should approve mounting, clearances, ventilation, labels, cables, connectors, torque records, polarity, insulation, and earthing. The check should also cover surge protection, isolation, breakers, panels, auxiliary power, communications, settings, export-control wiring, and emergency procedures.
Follow the manufacturer manual and approved project method. Testing itself can create hazards. Only qualified personnel should conduct it under the site’s permit and isolation system.
Energized acceptance
Witness startup, grid synchronization, operating values, alarms, trip functions, and reconnection. Test required reactive-power commands, active-power control, export-control behaviour, SCADA points, time synchronization, remote access, and safe shutdown.
Record the grid conditions during each test. A function that was not exercised should remain open, not be marked passed. Where a test depends on conditions that cannot be created safely, agree an approved simulation or later test method.
Handover dossier
Final payment should require a complete, indexed dossier containing:
- approved datasheet, manual, certificates, and compliance matrix
- model, hardware, firmware, and serial-number register
- approved single-line diagram and final DC string schedule
- cable, protection, earthing, and settings schedules
- export-control architecture, settings, and witnessed results
- SCADA point list, network drawing, credentials, and data ownership record
- inspection, torque, insulation, polarity, continuity, and commissioning records
- training material and attendance
- warranty registration and claim procedure
- spare register and storage instructions
- service contacts, escalation matrix, and SLA clock definitions
- approved as-built drawings and change record
The dossier should be stored in the owner’s controlled document system. A link that only the EPC can access is not a handover.
Final Buying Decision
The best 100 kW inverter tender is not the cheapest quotation. It is the lowest evaluated cost among offers that pass the site’s technical, compliance, safety, operations, and support gates.
Take these actions before award:
- Freeze the project data, price boundary, exact model, and deviation schedule.
- Obtain qualified approval for strings, MPPTs, AC network, PCC, protection, export control, thermal design, and compliance evidence.
- Compare commissioned price, downtime exposure, warranty remedy, spares, service, data terms, and acceptance obligations over the chosen evaluation period.
Keep the project on hold if any exact-model certificate, design input, grid setting, warranty remedy, or scope boundary remains unresolved. A delayed purchase order is cheaper than an incompatible inverter installed at an operating factory.
Frequently Asked Questions
What is the price of a 100kW on-grid inverter in India?
There is no responsible universal price. Ask at least 3 qualified suppliers for dated, itemized quotations against the same exact model and scope. Normalize delivery, GST, controls, protection, commissioning, warranty remedy, spares, and service. Compare the total evaluated cost, not a dealer’s bare equipment number.
What should a 100kW inverter tender include?
Include the design basis, exact model, DC and AC schedules, MPPT allocation, and PCC requirements. Also define protection, export control, SCADA, environmental conditions, logistics, tests, documents, warranty remedy, spares, training, service levels, taxes, exclusions, and deviations.
Is one 100kW inverter better than multiple smaller inverters?
Neither topology is always better. One unit can reduce equipment count and communications interfaces, but it concentrates downtime. Distributed units may fit separate roof zones and provide partial availability, but they add AC circuits, data points, and spare types. Compare both against the site’s layout, strings, PCC, access, and restoration plan.
How many solar panels can connect to a 100kW inverter?
Panel count cannot be set from inverter power alone. The engineer must check open-circuit voltage at the site’s lowest design temperature and operating voltage at high cell temperature. Input current, short-circuit current, MPPT allocation, connector limits, permitted DC oversizing, and the exact inverter manual also govern the count.
Does a 100kW on-grid inverter provide backup during a power cut?
A standard grid-following on-grid inverter normally stops energizing the grid after a qualifying outage or abnormal grid condition. Do not assume backup or island operation. Backup requires a separately designed architecture with compatible controls, protection, storage or another source, transfer logic, and written approval for the intended operating mode.
Which certificates should a 100kW inverter supplier provide in India?
Require exact-model evidence against the standards and orders applicable on the procurement date, plus the distribution licensee’s accepted grid functions and settings. Check the BIS record, test-report identity, model-family coverage, validity, issuing laboratory, firmware or hardware applicability, and any project-specific approval. Do not accept a generic brand certificate.
Are solar inverters included in the MNRE ALMM list?
No. MNRE’s Approved List of Models and Manufacturers is a framework for solar photovoltaic modules and cells, not an inverter ranking or proof of inverter approval. Evaluate inverter compliance through the applicable BIS, MNRE goods-order, CEA, distribution-licensee, and project requirements.
How should warranty and service be compared for a 100kW inverter?
Compare the remedy, not only the headline term. Define registration, start date, covered work, exclusions, and claim evidence. Price labour, travel, freight, lifting, replacement, reinstallation, and commissioning. Set response, attendance, restoration, escalation, spare, data-access, and missed-milestone terms.
