This page is for installers and EPC teams in India choosing solar proposal software. Short answer: for subsidy line, state DISCOM tariff and WhatsApp sending, from a sales app, pick QuickEstimate; for subsidy line plus a 3D proposal your customer can spin on a phone, pick SolarERP 3D.
If you quote Indian homes, your proposal needs three things: the PM Surya Ghar subsidy line, your electricity tariff, and a price in rupees. PM Surya Ghar is the central government subsidy scheme for home rooftop solar. A DISCOM is the power distribution company that serves your area. On the product pages we read, only two tools say they work out the subsidy on the proposal. They are QuickEstimate (its site now says Quickest Solar CRM) and SolarERP 3D. QuickEstimate also states WhatsApp sending and a free plan. SolarERP 3D states a list of 73 DISCOMs and a 3D proposal link your customer opens on a phone. QuickEstimate is a partner of SurgePV. OpenSolar’s core app is free, but you enter the subsidy by hand.
This is a desk comparison of what each vendor publishes, checked October 2026. We have not run side-by-side tests. Local rules below come from Indian government documents. Tool facts come from each vendor’s own site. For the wider rules, see our India solar compliance guide. This page covers proposal tools for rooftop and small commercial work. Design tools are on our India design list.
Criteria used: PM Surya Ghar subsidy line, DISCOM or state tariff in the quote, WhatsApp sending, rupee price, free plan or trial, design behind the proposal.
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Best-For Picks for India
- Subsidy line, state DISCOM tariff and WhatsApp sending, from a sales app: QuickEstimate. Its pages state all three. It has a free plan with 1 user and 10 proposals per month. Its own SurgePV page calls the product “deliberately shallow on engineering”. It is a partner of SurgePV.
- Subsidy line plus a 3D proposal your customer can spin on a phone: SolarERP 3D. Its site states 73 DISCOMs in 36 states and union territories. The price of the 3D add-on is not published.
- Free core app with WhatsApp sharing: OpenSolar. You enter the PM Surya Ghar subsidy by hand as a size-based incentive. API Access and connectors are charged from 16 April 2026.
- CAPEX and OPEX proposals with month-by-month output: Reslink. CAPEX means you buy the system. OPEX means you pay for power under a service contract. Its pricing page shows dollar prices.
- A published rupee price list: Arka360 or iSolar. Arka360 lists a sales proposal on every plan, plus 18% GST. iSolar lists Rs 25,000 per tenant per year after a free 7-day trial.
- Roof model to bill of materials and proposal in one product, priced per user: SurgePV. It documents roof modeling, shading, yield, financial modeling, bill of materials and proposals. Ask in a demo how it handles the subsidy line. Its published scope does not state one.
India Solar Proposal Software Comparison Table
Listed alphabetically. This is not a ranking; pick by the situation above. Prices checked October 2026 on each vendor’s own page.
| Tool | Best for | Price | Free or paid | Decisive scope fact |
|---|---|---|---|---|
| Arka360 | Rupee price list, proposal on every plan | Rs 46,000 to Rs 1,00,000 per year plus 18% GST (first rupee table) | Paid | Subsidy line not stated on pages we read |
| iSolar | Design, proposal and CRM, one annual price | Rs 25,000 per tenant per year | Free 7-day trial, then paid | Proposal with ROI, payback, SLD and BOM |
| OpenSolar | Free quoting, WhatsApp sharing | Core app free of charge; API Access and connectors charged from 16 April 2026 | Free core app, paid API and connectors | Subsidy entered by hand |
| QuickEstimate | Subsidy, DISCOM tariff and WhatsApp in the quote | Free; Pro Rs 6,999 per user per year (minimum 3 users) | Free and paid | Partner of SurgePV; vendor says engineering is shallow |
| Reslink | CAPEX and OPEX proposals | $2,000 to $10,000 per year by project size (dollar sign, currency not named; excluding taxes) | Paid | Subsidy not stated on product pages |
| SolarERP 3D | Subsidy line and 3D proposal link | 3D is an add-on; no price found | Start free, then paid | 73 DISCOMs stated |
| SurgePV | Roof model to BOM and proposal, per user | $1,899 per user per year (1 user), in US dollars | Paid, guided demo | No subsidy line stated |
India Proposal Matrix
Each cell is Documented, Partial or Not stated, based on the vendor pages we read in October 2026. Documented means the vendor’s own product, pricing or help page states it. Partial means the page states a related item, or only the vendor’s blog says it. Not stated means the pages we read do not mention it. There are no scores or weights.
| Tool | Subsidy line | DISCOM or state tariff | WhatsApp sending | Rupee price | Free plan or trial | Design behind the proposal |
|---|---|---|---|---|---|---|
| Arka360 | Not stated | Partial (utility rate finder listed; no DISCOM list) | Not stated | Documented (rupees plus 18% GST) | Not stated | Documented (3D, shading, CAD export; SLD export on Premium) |
| iSolar | Not stated | Partial (DISCOM-aware workflows; no list) | Not stated | Documented (tax not stated) | Documented (7 days) | Documented (design studio, SLD, BOM) |
| OpenSolar | Partial (entered by hand) | Partial (custom tariffs; no DISCOM list) | Documented | Not published (core app free) | Documented (core app) | Documented (flat RCC roofs, SLD template, BOM) |
| QuickEstimate | Documented | Documented (state DISCOM tariff) | Documented | Documented (GST status not stated) | Documented (free plan) | Partial (sizing and generation estimate; vendor says shallow on engineering) |
| Reslink | Partial (blog only) | Partial (blog only) | Not stated | Not published (dollar sign, currency not named) | Partial (page description says free trial available; FAQ offers a demo) | Documented (3D, SLD, BOM) |
| SolarERP 3D | Documented | Documented (73 DISCOMs) | Documented | Partial (CRM plans in rupees plus GST; 3D add-on, no price found) | Documented (start free) | Documented (3D, SLD, BOM) |
| SurgePV | Not stated | Not stated | Not stated | Not published (USD) | Not stated (guided demo) | Documented (roof model, shading, BOM) |
Three things stand out. Of the pages we read, only two vendors state a subsidy calculation on their product pages. No vendor page we read states a check of module origin against the scheme’s domestic content rules. Rupee prices are the exception, not the rule. A tool that does not state an item may still support it, so ask each vendor to quote one real Indian job.
Tool Entries
Arka360
Best for: teams that want a rupee price list with a sales proposal on every plan, and a vendor with an office in Bengaluru.
Not the right choice if: you need a PM Surya Ghar line described on a product page. The product, pricing and India pages we read do not mention it. The same goes for WhatsApp sending. Arka360’s blog has posts about the scheme, but the software pages say nothing on it.
What the vendor documents: its pricing page lists a sales proposal on every plan. It also lists a shading report, 3D visualization, PV layout CAD export and a generation report. SLD export is listed under Premium. CRM is listed as an add-on. Its installers page says proposals include financial breakdowns, ROI calculations and 3D visualizations. It adds that each proposal has an interactive QR code. Customers use it to view their layout on their rooftop. Its India page says sales teams can make proposals with energy analysis and financials in minutes.
Price (checked October 2026): the first rupee table on the pricing page lists Lite at Rs 7,500 a month or Rs 46,000 a year, Basic at Rs 11,500 or Rs 70,000, and Premium at Rs 16,500 or Rs 1,00,000. Each is plus 18% GST. Lite covers 360 residential projects. The same page also shows dollar plans.
Limitations: the India pricing page shows a second set of figures: Rs 56,000, Rs 80,000 and Rs 1,10,000 a year plus 18% GST. Ask which set applies to you. A webinar banner dated 9 January 2025 is still on the pricing page.
Vendor link: arka360.com.
iSolar
Best for: Indian EPC companies that want design, proposal, SLD, bill of materials and CRM under one published annual price. An SLD is a single line diagram, a simple drawing of how the system is wired. A bill of materials (BOM) is a parts list. CRM is software for customer and sales records.
Not the right choice if: you need a PM Surya Ghar line or WhatsApp sending stated before you sign up. The pages we read do not mention them. They also name no DISCOMs.
What the vendor documents: its home page lists branded proposals with ROI, payback, SLD, BOM and roof layout. It lists a design studio with roof detection, shading analysis, layout and simulation. It also lists a rule-based engine with validations for solar, electrical and DISCOM requirements, and a CRM. Its FAQ says it supports state and DISCOM-aware workflows. It says SLD and BOM outputs come from the saved design and equipment choices.
Price (checked October 2026): the pricing page lists a free 7-day trial, then “₹25,000 / year” for tenant-wide access. That covers design and simulation, proposals, BOM and SLD, and CRM and reporting. It says annual payments are non-refundable once processed. It does not say whether tax is extra.
Limitations: the home page footer and its latest-updates note are dated 2025. Confirm the product is current. The customer counts on that page are the vendor’s own figures, and we have not used them.
Vendor link: isolar.co.in.
OpenSolar
Best for: small installers who want a free core app that sends proposals on WhatsApp and shows customers an interactive 3D view.
Not the right choice if: you need the subsidy worked out automatically. The vendor’s help article shows how to set the incentive up by hand. It is also not right if you need a DISCOM list inside the tool (the pages we read state none).
What the vendor documents: its India page describes one-click proposal sharing on WhatsApp. It also describes an interactive 3D view inside the online proposal. The same page lists elevated structures for flat RCC roofs. RCC means reinforced concrete. A second help article describes an India SLD template, and its Auto BOM page describes a parts list built from the design. The first help article sets up the subsidy as a size-based incentive. The tiers are Rs 30,000 per kW from 0 kW, Rs 18,000 per kW from 2 kW and nothing from 3 kW. The cap is Rs 78,000. The article also says to recalculate projects already in progress.
Price (checked October 2026): the core app is free of charge for solar professionals, per the vendor. From 16 April 2026 the vendor charges for API Access (a way for other software to connect) and supported connectors. Its 16 February 2026 post says so. No rupee price is published.
Limitations: you must enter and update the subsidy tiers yourself. The pages we read name no DISCOM list.
Vendor link: opensolar.com.
QuickEstimate
QuickEstimate is a commercial partner of SurgePV. Both are in the Heaven Group, as QuickEstimate’s own SurgePV page says. Its site now calls the product Quickest Solar CRM.
Best for: installers who sell from a phone and want the subsidy, state tariff and WhatsApp sending in one quote, with a free plan to start.
Not the right choice if: you need engineering depth. The vendor’s own SurgePV page calls the product “deliberately shallow on engineering”. It says there is no automated data sync with SurgePV. It is also not right for a solo user who needs more than 10 proposals a month, because the free plan stops there.
What the vendor documents: its proposal page lists PM Surya Ghar auto-calculation, a panel and inverter library, branded PDFs, WhatsApp and email sending, and one-click revisions. It says subsidy rates are updated weekly from MNRE and state DISCOM notices. That is the vendor’s claim, and we have not checked it. Its FAQ says the subsidy and DISCOM tariff are applied by the customer’s state. It lists iOS and Android apps. The proposal page FAQ also says the free plan PDF carries “Powered by Quickest Solar CRM”, while Pro is white-labeled.
Price (checked October 2026): the pricing page lists Free at ₹0 for 1 user and 10 proposals a month. Pro is ₹6,999 per user per year, billed yearly, with a minimum of 3 users, which is ₹20,997 a year (3 × 6,999). Enterprise is custom for 25+ users. The page does not say whether prices include GST. It says tax invoices carry GST.
Limitations: the subsidy calculation is the vendor’s own, so check its figures against the rules below. The pages we read name no module-origin check.
Vendor link: quickestimate.co.
Reslink
Best for: Indian EPC companies whose sales staff design on a phone. They get CAPEX and OPEX proposals with month-by-month output, and a battery in the same proposal.
Not the right choice if: you need a subsidy calculation described on a product or pricing page. It appears only in Reslink’s blog posts. It is also not right if you need a rupee price list, because the pricing page shows dollar prices and no rupee price.
What the vendor documents: its proposal page lists CAPEX and OPEX proposals with month-by-month output and loss breakdown. It lists a battery priced in the same proposal, 25-year projections, and engineering drawings from the 3D model. Its scorecard blog post says the software works out the PM Surya Ghar subsidy from system size and flags equipment against ALMM and DCR rules. ALMM is MNRE’s Approved List of Models and Manufacturers for solar modules. DCR is the domestic content requirement. Those are the vendor’s blog claims, and we have not checked them.
Price (checked October 2026): the pricing page lists yearly plans with a dollar sign, excluding taxes. It does not name the currency, and Reslink’s terms say fees are billed in Indian rupees. Starter, up to 100 kW, is $2,000. Scaler, up to 500 kW, is $3,000. Builder, up to 5 MW, is $5,000. Developer, up to 100 MW, is $10,000. Its FAQ says you can request a demo. The page description says “Free trial available”.
Limitations: each plan caps project size. The page description says “Starting at ₹4,000/month”, and no plan card shows it. The page’s hidden structured data lists rupee plans that do not match the visible dollar plans. Get a rupee quote in writing.
Vendor link: reslink.org.
SolarERP 3D
Best for: Indian installers who want the subsidy line, a DISCOM picklist and a customer-facing 3D proposal link from one design. It also suits teams that may use SolarERP’s CRM.
Not the right choice if: you need a published price for the 3D tool. SolarERP says 3D is an add-on per company, and we found no figure. It is also not right if you want a long public track record, because the 3D site is new.
What the vendor documents: its 3D site says the proposal includes the PM Surya Ghar subsidy, GST, loan EMI (the monthly loan payment), payback and 25 years of savings. It describes an A4 PDF with a QR code to the 3D model and a web link that opens on any phone with no app. The link has WhatsApp and call buttons, and you see when the customer opens it. It lists 73 DISCOMs in 36 states and union territories. It also lists flat RCC roofs with parapets, tanks and stair cabins, and an SLD and BOM from the same design. It states the subsidy as Rs 30,000 per kW up to 2 kW and Rs 18,000 for the third kW. The cap is Rs 78,000, with an uplift for special-category states. It says you can override it.
Price (checked October 2026): the 3D site says “Start designing free”, with no card. The SolarERP site lists CRM plans per company per month, plus GST. The Starter plan adds customers, projects, surveys and proposals. It is ₹6,000 a month for up to 10 users. It says SolarERP 3D is an add-on per company. We found no price for the add-on.
Limitations: the DISCOM names are the vendor’s list, not a regulator’s. The subsidy amounts match the MNRE annexure below, but we have not checked its calculation.
Vendor link: 3d.solarerp.in.
SurgePV
SurgePV is our product.
Best for: teams that want roof modeling, shading, yield, financial modeling, bill of materials and proposals in one product, priced per user. They will confirm the Indian lines in a demo.
Not the right choice if: you want a self-serve trial (SurgePV offers a guided demo). It is also not right if you need a rupee price in writing before you talk to sales. This page quotes US dollars, and the pricing page shows rupee amounts to visitors in India. Skip it too if you need a subsidy line stated on the vendor’s page today (QuickEstimate and SolarERP 3D state one). Outputs support design and documentation. They do not replace approval by the responsible engineer, authority, lender or utility. SurgePV’s published product scope does not list a CRM. Monitoring and ERP are outside its scope.
What the vendor documents: 3D roof modeling, array layout, shading analysis and energy-yield modeling. It also lists financial modeling, electrical workflow support, bill-of-materials output and proposal generation. See solar proposal software for the product page.
Price (checked October 2026): $1,899 per user per year for 1 user, $1,499 per user for 3 seats, $1,299 per user for 5 seats, in US dollars.
Limitations: results depend on source data, assumptions and equipment models. The pricing page and published scope do not state a PM Surya Ghar calculation, a DISCOM tariff list or WhatsApp sending.
Vendor link: surgepv.com.
Indian Rules That Shape a Proposal
The subsidy line. The Ministry of New and Renewable Energy (MNRE) sets the central amounts for homes. The first 2 kWp of capacity gets Rs 30,000 per kWp (kilowatts of rated panel power). The next 1 kWp gets Rs 18,000. Nothing is added beyond 3 kWp. Special category states get Rs 33,000 and Rs 19,800 (MNRE annexure hosted by PIB, file dated 7 August 2024). So a 2 kWp home gets 2 × Rs 30,000 = Rs 60,000. A 3 kWp home gets 2 × Rs 30,000 + 1 × Rs 18,000 = Rs 78,000. In a special category state, 3 kWp gets 2 × Rs 33,000 + 1 × Rs 19,800 = Rs 85,800. A PIB release of 28 July 2026 mentions “higher central financial assistance for the first two kWp”. It gives no new amounts (PIB, 28 July 2026). The national portal blocked our automated reads, so check the current slab at pmsuryaghar.gov.in before you print a figure. Our PM Surya Ghar guide explains the portal steps. Its payout and loan passages differ from the PIB figures on this page. Follow PIB.
GST on solar. PIB says the GST Council cut GST on renewable energy devices from 12% to 5%. The new rate took effect on 22 September 2025. PIB’s example is a 3 kW rooftop system that becomes cheaper by about Rs 9,000 to Rs 10,500 (PIB, 17 September 2025). Show the rate and the date on the quote. Other items on a job, such as services, may carry a different rate. Ask your tax adviser.
Domestic modules. PIB says the scheme requires solar modules and cells made in India (PIB factsheet, March 2025). A later release says integration with the DCR portal ensures domestic content compliance (PIB, 4 August 2026). None of the seven vendors’ product or pricing pages we read states such a check. Reslink’s blog says it flags equipment. Check the module in your quote against the scheme’s list before you send it.
Loans. PIB says collateral-free loans from nationalized banks are offered at the repo rate plus 50 basis points. That is 5.75% a year for the present, over 10 years (PIB, 28 July 2026). An earlier PIB factsheet gave about 7%. Use the newest figure and date it. A loan line also needs the lender’s own terms.
Approval steps. Rules changed in February 2024. Systems up to 10 kW are exempt from the technical feasibility study. For larger systems the study time fell from 20 to 15 days, and approval is deemed given if the study is late. The DISCOM must commission a rooftop system within 15 days, down from 30 (PIB, 23 February 2024). PIB also says 32 states and union territories have removed application and net metering charges (PIB, 4 August 2026). Net metering counts the power you send to the grid against the power you take. Our DISCOM grid connection guide gives longer wait times that differ from PIB. Follow PIB, and check your state’s order for limits and export rates.
Regulator pointer. The Ministry of New and Renewable Energy (mnre.gov.in) runs the rooftop scheme. Your state electricity commission and your DISCOM set net metering terms and export rates.
What to Check in a Demo
Ask each vendor to quote one real 3 kW home from your last month of leads. Look for five things. They are the subsidy line, the GST rate and date, the DISCOM or state tariff, the module on the quote, and the loan line. Then ask how the proposal reaches the customer. Where a vendor does not publish an item on the pages we read, the matrix says Not stated. A demo is the place to confirm it.
How We Ordered These Tools
SurgePV publishes this page and is a vendor on this list. Its entry uses the same vendor-page sources and template as every other tool here.
We did not rank these tools. They are listed alphabetically, and the best-for picks come from the matrix above.
- Subsidy line: buyers compare quotes after subsidy. We did not assess whether any tool’s calculation is correct.
- DISCOM or state tariff: the tariff drives the savings figure. We did not assess how any tool models export.
- WhatsApp sending: many Indian customers reply on WhatsApp. We did not assess delivery or read-receipt accuracy.
- Rupee price: a rupee price shows what an Indian buyer will pay, and a tax line shows how the vendor bills. We did not assess discounts or negotiated quotes.
- Free plan or trial: a free plan lets a small team test the workflow. We did not assess the limits of any plan beyond what its page states.
- Design behind the proposal: a proposal is only as good as the design under it. We did not assess how accurate any tool’s design is.
Sources and Dates
Vendor pages were read in October 2026. They are Arka360 (pricing, India pricing, installers page), iSolar (pricing, home page), OpenSolar (India, free and the help article above), QuickEstimate (pricing, proposal page, FAQ, SurgePV page), Reslink (proposal, pricing), SolarERP (3D site, main site) and SurgePV (pricing). Government sources are the PIB releases and the MNRE annexure linked above. The PM Surya Ghar portal (pmsuryaghar.gov.in) blocked our automated requests, so we did not read it directly. Several vendor sites load their text with scripts, and we read them in a browser. The OpenSolar help center blocked our command-line tool, and we read it in a browser too. Sunbase and Zoho CRM are not compared here. The Sunbase product pages we read do not mention India, and its India claims sit in a blog post. We did not assess Zoho CRM.
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Frequently Asked Questions
What is the best solar proposal software in India?
It depends on what the quote must show. On the product pages we read, only QuickEstimate and SolarERP 3D say they work out the PM Surya Ghar subsidy on the proposal. QuickEstimate also states WhatsApp sending and a free plan. SolarERP 3D states a list of 73 DISCOMs and a 3D proposal link. OpenSolar’s core app is free, but you enter the subsidy by hand. QuickEstimate is a partner of SurgePV.
Does proposal software calculate the PM Surya Ghar subsidy?
Some does. QuickEstimate and SolarERP 3D say so on their own pages. OpenSolar’s help article shows how to enter the subsidy by hand. Reslink’s blog says its software works it out, but its product pages do not. The central amounts in the MNRE annexure are Rs 30,000 per kWp (kilowatt of rated panel power) for the first 2 kWp and Rs 18,000 for the next 1 kWp, with none beyond 3 kWp. Check any tool’s figure yourself.
How much does solar proposal software cost in India?
Prices come in different currencies. QuickEstimate has a free plan and a Pro plan at Rs 6,999 per user per year, with a minimum of 3 users. iSolar lists Rs 25,000 per tenant per year after a 7-day trial. Arka360 lists plans in rupees plus 18% GST on its pricing page. Reslink shows dollar prices. SolarERP prices its CRM plans per company per month, and its 3D tool is an add-on with no price we found. OpenSolar’s core app is free. SurgePV lists 1,899 US dollars per user per year for one user.
Is there free solar proposal software in India?
Yes, with limits. QuickEstimate’s free plan gives 1 user and 10 proposals per month. OpenSolar says its core app is free for solar professionals, and it charges for API Access and supported connectors from 16 April 2026. SolarERP 3D says you can start designing free with no card. iSolar offers a free 7-day trial. Read each plan’s limits before you build your sales process on it.
What should an Indian solar proposal say about GST and loans?
State the GST rate you used and the date. PIB says GST on renewable energy devices fell from 12% to 5% from 22 September 2025. For loans, PIB says collateral-free loans from nationalized banks cost the repo rate plus 50 basis points. That is 5.75% a year for the present, over 10 years. Rates change, so date the figure on the proposal.
Does proposal software guarantee DISCOM approval?
No. A proposal tool can list the drawings and figures a DISCOM may ask for. It does not approve anything. PIB says systems up to 10 kW are exempt from the technical feasibility study. Your DISCOM and state still set the forms, fees and limits. Check them before you promise a date.
