Answer
Choose a rooftop solar installation company only after it measures the site and supplies a traceable design, exact equipment, structural and electrical scope, approval responsibilities, realistic generation assumptions, separate warranties, evidence-based payment stages, and an after-sales route. Compare qualified bids against one brief where alternatives are available. The cheapest total is not meaningful until capacities, exclusions, taxes, utility work, labour, monitoring, and warranty costs are normalized.
A rooftop solar installation company should manage one accountable chain from survey and design through procurement, construction, utility coordination, testing, handover and service. A sales quote without that chain is not a complete offer.
Scope before price
Compare the same DC/AC capacity, equipment models, structure, cables, protection, approvals, taxes, exclusions, monitoring, tests, warranty labour and handover. Only then does total price mean anything.
Verify company and project route
Match the legal entity across quotation, contract, invoice, bank beneficiary and warranty. Confirm the electricity licensee, consumer category and approval route from the latest bill. For Indian projects, establish the current scheme and utility route before relying on vendor status. The National Portal vendor directory and its FAQ could not be retrieved in this review. Use the MNRE rooftop programme page to locate official information, then confirm the applicable current portal and DISCOM process. This review verifies no installer entry, application, subsidy, or approval. Retain control of your account and recovery details; do not send an installer your password or OTP.
Ask who performs the survey, design, structural review, electrical work, installation and service. Subcontracting is not automatically wrong, but the contracted company must remain accountable.
Demand design and model-level evidence
The survey should record roof type and condition, usable area, shade, drainage, waterproofing, access, wind exposure, inverter location, cable routes, meter, connection, earthing and distribution equipment. Uncertain or elevated structures need review appropriate to the risk. Request a reviewed layout, shade assessment, structural basis, and single-line electrical diagram before accepting the equipment and installation scope.
Freeze full module and inverter models, quantities, serial handover, structure grade/sections/coating, cables, isolation, surge and overcurrent protection, earthing and monitoring ownership. Build a project-specific product applicability register. MNRE’s ALMM resources concern PV module/cell models, not installer competence or inverter approval. Check relevant exact-product registration through BIS resources; a valid product record does not approve the site design, seller, or installation.
Keep one approved layout, string schedule, and equipment register with a revision owner. A solar designing platform is a preparation tool; the project reviewer must check that its outputs match the released documents. Require written approval for substitutions.
Rebuild production and economics
Require weather source, geometry, shade, temperature, soiling, mismatch, cable, inverter, clipping, availability and degradation assumptions. Compare bids using the same weather, measurement boundary, loss definitions, and financial perspective; one energy and financial modeling workflow can organize that comparison. Do not double-count losses already embedded in modeled AC energy. A forecast is not a guarantee unless the contract defines measurement, weather adjustment, exclusions and remedy.
Commercial sites also need interval or representative load, operating hours, self-consumption, export and applicable tariff assumptions. Residential subsidy must not be applied to business economics.
Contract for evidence and support
Assign design, applications, corrections, inspection, metering, commissioning and handover. Negotiate payment evidence for the contracted scope: approved design, verified delivery, installation, tests, applicable utility milestones, working monitoring, and corrected documents. Do not make a supply-only contractor responsible for unrelated utility timing by implication.
Separate module product/performance, inverter, mounting/corrosion, workmanship, roof, monitoring and service warranties. State labour, travel, freight, removal and reinstallation. Ask for ticket, escalation, response, site-visit and spare terms.
Disclosure: SurgePV and Heaven Green Energy have a common commercial relationship. This is a relevant provider, not an independent ranking.
Heaven Green Energy offers rooftop EPC. Its services page describes residential and C&I installation. Treat coverage, scale and performance statements as company claims. Verify its site design, exact models, eligibility, local references, exclusions, warranty labour and service route. It may not fit every roof or project.
Normalize every rooftop bid. Build one design and evidence brief in the SurgePV demo workflow.
Red flags
- No measured survey or model numbers
- Customer portal control or OTP requested
- Structure and protection called merely “standard”
- Generation has no stated inputs
- Payment is front-loaded before tests and handover
- One long warranty hides component and labour exclusions
- No named service or escalation process
Frequently asked questions
How do I choose a rooftop solar installation company?
Compare qualified companies against one site-specific brief; choose a practical shortlist for the project rather than a universal minimum. Verify legal identity and local eligibility, then score survey, engineering, exact equipment, safety, approvals, generation assumptions, contract, warranties and service.
What should a rooftop solar quotation include?
It should include DC and AC capacity, exact models and quantities, layout, structure, cables and protection, generation inputs, approval work, taxes, exclusions, schedule, payment evidence, warranties and handover documents.
Is the cheapest rooftop solar company the best choice?
No. A low price may omit engineering, safe access, protection, approvals, warranty labour or service. Normalize the scope and risk before comparing price.
What warranties should I request?
Request separate module product and performance, inverter, mounting/corrosion, workmanship, roof-penetration, monitoring and service terms, including labour, travel, freight and reinstallation.
Can Heaven Green Energy install rooftop solar?
Heaven Green offers rooftop EPC services. Verify its current service coverage, eligibility, proposed design, equipment, contract, warranties and local support against other qualified bidders.
Sources
Primary research and reference material used for this desk-research article.
Where this fits
This article is part of SurgePV's Solar Installation hub, which works through the topic from first principles to the decisions a project team actually has to make.
