Evaluate Solar Installer Credibility 2026 — 12-Point Score

A rooftop solar system is a 25-year asset, but roughly one in four solar installers in India disappears within five years of registration. When a fly-by-night EPC (Engineering, Procurement and Construction) contractor shuts shop, the homeowner is left with orphaned warranties, no service contact, and a depreciating system that nobody will diagnose. The ₹ amount at risk is not small — a typical 5 kW residential install carries ₹2.6–₹3 lakh of capital plus a ₹78,000 PM Suryaghar subsidy claim that can be clawed back if the system fails inspection. Installer credibility is the single largest determinant of whether your investment performs for 25 years or falls silent in year three. This guide gives you a repeatable, document-led process to evaluate any solar installer in 2026 — built from the patterns we see across 10,000+ Heaven Green Energy installations in the last decade.

Direct answer. To evaluate solar installer credibility in 2026, run a 12-point scorecard: MNRE empanelment, ALMM panel access, BIS inverter listing, active GSTIN, EPFO compliance, three years of MCA21 filings, verifiable past project count, portal and Google ratings, documented warranty handling, a named escalation contact, balance-sheet stability, and founding year. An installer scoring 9 or higher across these twelve credibility points is statistically far less likely to vanish before your warranty window closes.

This is not a vibe-check. Every point on the scorecard maps to a public government portal or a document the installer can produce on request. If they refuse, that itself is a data point — and a strong signal to walk away before signing the purchase order.

Why Installer Credibility Is the #1 Decision in Solar

When prospective customers ask us what they should optimise for — price, panel brand, or warranty — our consistent answer is none of the above. The single most predictive variable for long-term rooftop solar success is whether the installer is still in business in year ten. Panels and inverters from tier-1 manufacturers like Adani, Waaree, or Tata are interchangeable; the legal entity that warranted, installed, and commissioned the system is not. If that entity is dissolved, your warranty is functionally worthless — manufacturer pass-through warranties exist on paper but require an authorised service partner to file the claim, and most homeowners cannot navigate the MNRE escalation pipeline alone.

The market structure compounds this. India’s rooftop solar market expanded from roughly 4 GW of cumulative installs in 2020 to over 17 GW by end-2025, and the PM Suryaghar scheme has pulled thousands of new installers into the residential category. Many of these new entrants are repackaged electrical contractors with no balance-sheet depth, no EPFO-registered field staff, and no formal warranty handling process. They quote low because they have zero overhead — and they exit low when the after-sales workload hits.

A 2024 study by the National Institute of Solar Energy on rooftop solar service quality found that complaint resolution time correlates strongly with installer age — companies founded before 2018 resolve service tickets in an average of 6 working days, while sub-3-year-old entities take 21 days or longer, with a 12% rate of unresolved complaints after 60 days. The lesson is uncomfortable but clear: cheap quotes from new players carry hidden costs that surface five to seven years after commissioning, when the original sales conversation is long forgotten.

The 12-point scorecard below was built to surface those hidden costs early — at the quote stage, before any payment changes hands. Every check is free, takes under 15 minutes, and uses publicly available government portals. If you only do five things from this guide, make sure they are the GST, EPFO, MCA21, MNRE empanelment, and Google rating checks. They alone will filter out the bottom 40% of unstable installers in your shortlist.

The 12-Point Installer Credibility Scorecard

This is the named framework we use internally and recommend to any homeowner or commercial buyer evaluating a solar quote. Score each item out of one — total score out of twelve. Nine or above is hire-grade. Six to eight warrants deeper diligence and reference calls. Five or below should be declined regardless of price. The scorecard works for residential and commercial buyers alike, with weighting differences noted where relevant.

#	Credibility Point	Where to Verify	Pass Threshold
1	MNRE empanelment	pmsuryaghar.gov.in vendor search	Listed in your state
2	ALMM panel access	Manufacturer contract / PO copy	Tier-1 ALMM brand
3	BIS inverter listing	BIS portal + product label	IS 16221 / IS 16169
4	GSTIN active	services.gst.gov.in	Active, < 6 months filing gap
5	EPFO compliance	epfindia.gov.in establishment search	Registered, current ECR
6	MCA21 filings	mca.gov.in master data	AOC-4 and MGT-7 for 3 years
7	Past installation count	Vendor disclosure + sample POs	≥ 500 residential or ≥ 50 commercial
8	Average rating	PM Suryaghar + Google	≥ 4.2 across both, ≥ 100 reviews
9	Warranty handling history	Resolved-ticket evidence	Documented 3+ cases
10	Escalation path	Named senior leader	Direct mobile or email
11	Financial stability	Balance-sheet trend (MCA21)	Positive net worth, 3-yr revenue growth
12	Founding year	CIN incorporation date	Founded before 2020 ideal

1. MNRE Empanelment

The Ministry of New and Renewable Energy maintains the master list of vendors authorised to install systems under PM Suryaghar: Muft Bijli Yojana. Check the installer name on pmsuryaghar.gov.in under the state vendor search. If they are not listed, they cannot legally claim the ₹78,000 subsidy on your behalf — the application will fail at Stage 2. For a deeper look at why empanelment rank matters, see why PM Suryaghar rank matters.

2. ALMM Panel Access

The Approved List of Models and Manufacturers (ALMM) is the MNRE-curated whitelist of solar modules that pass quality and origin checks. An empanelled installer must have either a direct supply contract or an authorised distributor relationship with an ALMM tier-1 manufacturer. Ask for a sample purchase order copy. Installers without ALMM access source from grey-market imports — these panels fail DISCOM inspection and forfeit the subsidy.

3. BIS Inverter Listing

The Bureau of Indian Standards (BIS) maintains conformity certifications for solar inverters under IS 16221 (Part 2) and IS 16169. The installer’s quoted inverter model must appear on the BIS register. Cross-check the model number on the inverter datasheet against the BIS portal — Sungrow, Growatt, Solis, and Microtek tier-1 models are all listed. Sub-tier brands frequently fail this check.

4. GST Registration

A legitimate solar EPC must be registered for Goods and Services Tax (GST). Ask for the 15-digit GSTIN (Goods and Services Tax Identification Number) and verify on the GST portal search. The status must show “Active” and the last return filing date must be within the current quarter. An installer with a six-month filing gap is in compliance trouble — and likely cannot raise valid tax invoices for your accelerated-depreciation claim if you are a commercial buyer.

5. EPFO Compliance

Employees’ Provident Fund Organisation (EPFO) registration is the single strongest signal that the installer employs real, salaried field staff — not freelance subcontractors paid in cash. Search the establishment name on the EPFO Unified Portal under “Establishment Search”. Active monthly ECR (Electronic Challan-cum-Return) filings of 10 or more employees indicate a real workforce. No EPFO registration = no permanent installation crew = no continuity for warranty service.

6. MCA21 Financial Filings

The Ministry of Corporate Affairs (MCA) operates MCA21, the registry of every Private Limited and Limited company in India. Search the installer’s legal name to retrieve the Corporate Identification Number (CIN). Request the last three years of AOC-4 (Annual Financial Statement) and MGT-7 (Annual Return) filings — both are public. Late filings or “Strike Off” status are large red flags. The MOA (Memorandum of Association) should explicitly list solar EPC as a business activity.

7. Past Installation Count

Ask the installer for total installation count to date, broken down by residential and commercial. A residential-focused installer with under 500 commissioned systems lacks the field repetitions to handle edge cases — odd roof angles, shading workarounds, DISCOM-specific net meter quirks. A commercial installer with under 50 industrial projects has not yet seen the load-side failure modes that emerge at 100+ kW. Heaven Green Energy has crossed 10,000 installations across 25+ cities since 2015.

8. Average Rating

Pull the installer’s rating from two independent sources: the PM Suryaghar national portal and Google Maps / Google Business Profile. Both should be ≥ 4.2 with a minimum of 100 reviews. Single-source 5-star ratings on a brand-new Google profile are highly suspect — fake reviews are easy to spot from review velocity and reviewer-profile depth. Cross-checking with our Suryaghar vendor verification guide catches manipulated listings.

9. Warranty Handling History

Past behaviour is the only reliable predictor of future warranty response. Ask for three documented warranty cases — what failed, when, how it was resolved, and the time to close. Reputable installers maintain a warranty ledger and can share redacted summaries. Vague answers (“we handle warranties same-day”) with no specifics indicate no real process. The full list of questions to put to any installer at this stage is in our questions to ask solar installer checklist.

10. Escalation Path

If your monthly generation drops 20% and the field engineer ignores your call for a week, who do you escalate to? A credible installer names a senior leader — a director, COO, or service head — with direct mobile or email. Anonymous “support@” escalations get lost. Heaven Green Energy publishes a named senior escalation contact for every commissioned customer with a documented first-response SLA of under 48 hours.

11. Financial Stability

Pull the AOC-4 balance sheet from MCA21 for the last three years. Look for positive net worth, year-on-year revenue growth, and current ratio above 1.2. Loss-making installers with deteriorating ratios are statistically at higher dissolution risk inside five years. For commercial buyers signing 25-year O&M contracts, this check is non-negotiable.

12. Founding Year

The CIN incorporation date is on every MCA21 master-data page. Older is better — companies founded before 2020 have weathered the GST transition, COVID supply shocks, and the 2022 BCD tariff disruption, all of which exposed weak balance sheets. A pre-2018 founding year combined with positive net worth is the single strongest survival signal in the Indian rooftop solar market. Heaven Green Energy was founded in 2015 and has navigated every major regulatory shift since.

Documents to Request and What They Reveal

Before signing any purchase order, request a small bundle of documents from the installer. These are the same documents we hand to every prospective customer who asks — none are confidential, and refusal to share them is itself diagnostic. The matrix below maps each document to what it tells you about installer credibility.

Document	What It Reveals	Watch For
MNRE empanelment certificate	Authorised to claim PM Suryaghar subsidy	Expired or state-mismatched certificate
GST registration certificate	Legal entity, tax compliance	Recent registration, mismatched address
EPFO registration letter	Real employee base	Missing or proprietorship-only filings
MCA21 AOC-4 (last 3 yrs)	Financial stability	Losses, negative net worth, late filings
MCA21 MGT-7 (last 3 yrs)	Ownership and director continuity	Director churn, undisclosed subsidiaries
Sample warranty card	Warranty terms and pass-through chain	Vague terms, no manufacturer co-sign
Past PO list (5–10 redacted)	Real installation history	Identical addresses or fabricated PO numbers
BIS inverter test certificate	Compliance with IS 16221 / IS 16169	Generic certificate without model number
ALMM panel supply contract	Tier-1 module access	Distributor-of-distributor chains
Insurance policy (CGL / WC)	Liability coverage	No coverage = no compensation if injury occurs on-site

A common error here is accepting brochures and website screenshots in place of original certificates. The MNRE empanelment certificate is a signed PDF with a verifiable certificate number — ask for the original. The MCA21 documents are downloadable from the MCA portal for ₹100 per filing; if the installer charges you for them, they are testing whether you will actually verify. A proper installer will share them at no cost as part of the diligence package.

For commercial buyers, add three more documents: latest income tax return acknowledgement, professional indemnity insurance policy, and sample completion certificate from a comparable-sized past project. These are standard in B2B procurement but rarely requested in residential — yet residential buyers absorb the same financial risk.

Online Portals to Cross-Check

The single biggest advantage homeowners have in 2026 is that nearly every credibility data point is available on a free government portal. Spending 15 minutes across these five portals filters out the bottom 40% of unstable installers in your shortlist. We use the same portals on every supplier diligence cycle at Heaven Green Energy.

Portal	URL	What to Check	Time
PM Suryaghar vendor search	pmsuryaghar.gov.in	MNRE empanelment, state coverage, rating	3 min
MCA21 master data	mca.gov.in	CIN, founding year, AOC-4, MGT-7, director list	5 min
GST search	services.gst.gov.in	GSTIN active status, filing recency	2 min
EPFO establishment search	epfindia.gov.in	EPFO registration, ECR filings	2 min
BIS Manak Online	manakonline.in / bis.gov.in	Inverter conformity certificate by model	3 min

PM Suryaghar vendor search is the fastest first filter — type the installer name in the state vendor list. If they are not listed, the conversation ends here for any subsidy-eligible install.

MCA21 master data is the deepest source. Search by company name to pull the CIN, then click “View Public Documents” to access the AOC-4 (financial statements) and MGT-7 (annual return) filings. These cost ₹100 each but give you three years of audited financials — invaluable for a 25-year decision.

GST search confirms the installer’s GSTIN is active and that returns have been filed in the current quarter. A “suspended” status means the installer cannot legally issue tax invoices, which destroys any commercial buyer’s depreciation claim.

EPFO establishment search is the most-overlooked check. Type the installer’s legal name to confirm EPFO registration. The number of monthly contributors approximates the field workforce — 50+ contributors is a healthy mid-sized installer, 100+ is established.

BIS Manak Online validates the inverter model on the quote. Type the model number; if it does not appear in the IS 16221 conformity register, reject the quote outright.

Run the 15-minute portal sweep before any payment. If the installer fails any portal check, request a written explanation in 48 hours. No response or vague response = move to your next shortlist option. Get a free verified quote from Heaven Green →

This sweep also catches identity fraud — installers who present themselves under one brand name while operating a different legal entity. The legal name on the GSTIN must match the legal name on the MCA21 CIN must match the legal name on the EPFO registration. Mismatches here usually indicate a shell-company structure designed to limit liability if things go wrong.

Past Project Reference Calls — What to Ask

Document checks tell you the installer exists and is solvent. Reference calls tell you what their customers actually experience two, three, and five years post-installation. This is the most under-used step in the credibility evaluation — most buyers skip it because it feels awkward to cold-call strangers. Do not skip it. A 20-minute reference call surfaces information no document ever will.

Ask the installer for three references spanning different ages: one installation under one year old, one between two and four years old, and one beyond five years. The five-year reference is the most valuable — it tells you how the installer handles the inverter mid-life service interval, the panel cleaning cycle drop, and any net meter recalibration with the DISCOM.

For each reference, run a structured 6-question script. Do not let the conversation drift into general satisfaction — that yields nothing actionable.

1. What system size and what year was it commissioned? Pin the timeline so you know what warranty window they are in.
2. What is your monthly generation in kWh, and how does that compare to the installer’s pre-sale promise? Generation shortfall is the most common hidden complaint.
3. Have you raised any service tickets? If yes, what was the response time and resolution time? Average resolution under 7 days is healthy; over 21 days is concerning.
4. Has the installer ever asked for additional money after the original purchase order? Mid-project price hikes are a hallmark of weak installers.
5. Did the installer handle the DISCOM and PM Suryaghar coordination, or did you have to? Strong installers own the entire workflow.
6. Would you hire this installer again for a second project? The single most predictive question — un-thinkable yes vs hedged yes tells you everything.

Cross-reference the answers with the installer’s own claim about average installation generation, average ticket resolution time, and complaint volume. Discrepancies of more than 15% indicate the installer is overstating performance. For a deeper drill into the full vetting playbook, see how to choose a solar contractor and the related how to choose solar installer guide.

A common credibility evaluation mistake here is accepting only references the installer hands to you. Those references are pre-coached and statistically biased toward positive feedback. Augment them with independent references — search Google Maps for the installer’s brand name within 5 km of your address, find a commissioned system in the photos, and call that homeowner directly. Most are happy to share their unfiltered experience.

Common Credibility Verification Mistakes

Across our customer onboarding conversations, the same five mistakes show up repeatedly when buyers attempt installer due diligence on their own. Each one materially weakens the verification. Watch for them in your own process — and in the processes of any consultant doing this on your behalf.

1. 1
   Trusting the vendor's own website testimonials. Website testimonials are unverified. Always back-verify three through independent Google Maps searches or PM Suryaghar portal ratings before weighting them.
2. 2
   Skipping the EPFO check. An installer without EPFO registration is using subcontracted labour with no payroll continuity. When a senior technician leaves, the institutional knowledge to service your system leaves with them.
3. 3
   Treating MNRE empanelment as sufficient. Empanelment is a necessary minimum, not a credibility certificate. Roughly 60% of empanelled vendors have under three years of operating history. Empanelment must be combined with the other 11 checks.
4. 4
   Ignoring the inverter sub-brand. Many installers headline a tier-1 panel brand while quoting a tier-3 inverter — the inverter is the failure-prone component. Verify the inverter on the BIS register independently of the panel.
5. 5
   Optimising for the lowest quote. The lowest quote in your shortlist almost always comes from the installer with the weakest balance sheet. A ₹15,000 saving on a 3 kW system is irrelevant if the installer dissolves in year four. Weight the scorecard, not the quote.
6. 6
   Not asking for warranty handling case studies. Every credible installer has resolved warranty cases — and is willing to share three redacted examples. The absence of any documented case is the absence of any real process.

For an exhaustive list of red flags hidden inside a typical solar quote — pricing, warranty terms, equipment substitutions — read our red flags in solar quote breakdown. It pairs cleanly with this scorecard at the contract-review stage.

Online vs In-Person Vetting

Should you run the full scorecard remotely from the portal sweep, or visit the installer’s office and a completed site in person? Both have a role. Here is how to weight them.

Verdict. Use the online portal sweep as the first filter — run it across your full 5–7 installer shortlist in one afternoon. Drop anyone failing more than two of the 12 scorecard points. Then do one in-person visit with the top two — see the warehouse, meet a senior leader, and visit one commissioned installation. The two methods together catch ~95% of credibility risks that either alone would miss.

For commercial buyers, an additional layer applies: a formal site audit at one of the installer’s industrial reference sites, ideally a system that has been running for 3+ years. This is the only way to assess workmanship aging on metal structures, cable management, and earthing systems exposed to monsoon and dust cycles.

How Heaven Green Energy Demonstrates Credibility

We hold ourselves to the same 12-point scorecard we recommend to our customers. Every credibility check above has a corresponding public artefact we are happy to share at the quote stage — usually before you ask. Here is how Heaven Green Energy maps to the scorecard.

• MNRE empanelment — listed in all 25+ operating cities; India’s #1 ranked PM Suryaghar installer on the national portal.
• ALMM panel access — direct supply contracts with Adani, Waaree, and Tata; never grey-market imports.
• BIS inverter listing — exclusively Sungrow, Growatt, and Solis inverters on the IS 16221 register.
• GST registration — active GSTIN with no filing gap since incorporation.
• EPFO compliance — 120+ permanent employees on EPFO ECR, monthly filings up to date.
• MCA21 filings — all three years of AOC-4 and MGT-7 publicly available on the MCA portal; available on request.
• Past installations — 10,000+ commissioned systems since 2015 across 25+ cities.
• Average rating — 4.6+ on PM Suryaghar portal and 4.7+ on Google across multiple locations, hundreds of reviews each.
• Warranty handling — documented warranty resolution ledger with average closure under 7 working days.
• Escalation path — named senior leader for every customer, < 48 hour first-response SLA.
• Financial stability — positive net worth and growing revenue across the last three audited years.
• Founding year — operational since 2015, weathered every major regulatory shift in Indian solar.

Match these against the services that fit your project:

• Residential Solar — 1–10 kW rooftop systems with PM Suryaghar subsidy handled end-to-end.
• Solar EPC Services — turnkey commercial and industrial delivery with performance guarantees.
• Contact Heaven Green — request the full credibility document bundle along with your quote.

If you want a single starting point, our how to choose solar installer guide consolidates the buyer’s-side checklist, and the Suryaghar vendor verification walkthrough shows the portal sweep with screenshots.

Frequently Asked Questions

How many of the 12 credibility points must an installer pass to be considered safe?

Nine or above is the hire-grade threshold. The non-negotiable five are MNRE empanelment, active GSTIN, EPFO compliance, three years of MCA21 filings, and a Google rating of 4.2 or higher. An installer passing these five but failing on warranty handling history or founding year may still be acceptable for a smaller residential install, but we would not recommend them for a commercial 25-year contract.

Is MNRE empanelment alone enough to verify a solar installer’s credibility?

No. MNRE empanelment is a necessary minimum but not a sufficient credibility certificate. Roughly 60% of empanelled vendors have under three years of operating history, and empanelment does not assess financial stability, EPFO compliance, or warranty handling. Always pair the empanelment check with the other 11 points on the scorecard — particularly the MCA21 financial filings and the EPFO establishment search.

How can I verify the installer’s GSTIN is active and in good standing?

Go to services.gst.gov.in and use the “Search Taxpayer” function with the 15-digit GSTIN provided by the installer. The page shows current registration status, principal place of business, and the last return filing date. The status must read “Active”. The last filing date must be within the current GST quarter. Suspended or cancelled GSTINs indicate the installer cannot raise valid tax invoices, which destroys any commercial buyer’s input-tax-credit or depreciation claim.

What is the EPFO check and why does it matter for solar installation?

EPFO (Employees’ Provident Fund Organisation) registration is a public record of the installer’s permanent employee base. Search the installer’s legal name on the EPFO Unified Portal under Establishment Search. The number of monthly Electronic Challan-cum-Return (ECR) contributors approximates the salaried workforce. No EPFO registration means the installer relies on subcontracted labour with no payroll continuity — when a senior technician leaves, the institutional knowledge to service your system goes with them.

How do I read the MCA21 filings to assess financial stability?

Search the installer’s legal name on mca.gov.in to retrieve the CIN (Corporate Identification Number). Click “View Public Documents” and download the AOC-4 (Annual Financial Statement) for the last three years — each filing costs ₹100. In the balance sheet, look for positive net worth, year-on-year revenue growth, and a current ratio above 1.2. Negative net worth, declining revenue, or “Strike Off” status are large red flags for any installer asked to honour a 25-year warranty.

What should I do if an installer refuses to share verification documents?

Refusal is itself a data point — and a strong signal to walk away before any payment changes hands. The MNRE empanelment certificate, MCA21 filings, GST certificate, and EPFO registration are all public or semi-public documents. A credible installer treats sharing them as a normal part of the quote process. If an installer claims confidentiality on documents that are publicly searchable on government portals, they are signalling that something on those documents does not stand up to scrutiny.

How many past customer references should I call before signing the purchase order?

A minimum of three, spanning different installation ages: one under one year old, one between two and four years, and one beyond five years. The five-year reference is the most valuable — it tells you how the installer handles mid-life inverter service, panel cleaning drop-off, and net meter recalibration. Run the structured 6-question script from this guide on each call rather than open-ended satisfaction questions. Also call one independent reference you sourced yourself from Google Maps, not from the installer’s list.

Does the 12-point scorecard apply to commercial solar buyers the same way as residential?

The framework is the same, but the weighting shifts. Commercial buyers should weight financial stability (point 11), past installation count (point 7), and EPFO compliance (point 5) more heavily because the contract value and the O&M tail are larger. Commercial buyers should also add three diligence items not on the residential scorecard: latest income tax return acknowledgement, professional indemnity insurance policy, and an on-site audit of a comparable industrial reference project that has been running for at least three years.