Most homeowners and business owners get 2–3 solar quotes and pick the cheapest one. That is the single fastest way to end up with a substandard system, missing warranty, or — in the worst case — a contractor who disappears after installation. Across 10,000+ installations at Heaven Green Energy, our team has reviewed thousands of competitor quotes. The same ten red flags appear again and again, and they cost buyers anywhere from ₹30,000 to ₹5 lakh in extra costs, repairs, or lost subsidies.
Key takeaway. A solar quote with missing panel model numbers, no inverter brand specification, a vague “25-year warranty” without a manufacturer warranty card, or no MNRE empanelment number should be rejected immediately. In India 2026, a legitimate solar quote specifies every component by exact model, includes BIS (Bureau of Indian Standards) certification numbers, names the DISCOM for net metering, and provides a signed warranty commitment letter. Heaven Green Energy provides all of this as standard in every quotation.
This guide goes through each red flag in detail so you know exactly what to ask for — and what to walk away from.
Why Indian Solar Quotes Are So Variable
India’s solar market has over 10,000 registered solar companies and another 50,000+ informal installers who operate without MNRE empanelment. The range in quality is extreme: a premium MNRE-empanelled EPC company uses Tier-1 panels, BIS-certified inverters, and provides genuine manufacturer warranties. An informal installer may use off-spec panels, uncertified inverters, and issue a warranty that is effectively worthless.
The problem for buyers is that both types of companies can produce a similar-looking quote at very different prices. A 5 kW system might be quoted at ₹2,00,000 by one company and ₹3,20,000 by another — and without knowing the specific components, you can’t tell which is better value.
The cost breakdown guide for solar panels explains how legitimate system costs are structured. Use that as a baseline when reading quotes.
💡 Fast tip
Use the "3-Quote Verification Method": get three quotes from MNRE-empanelled installers only (verify empanelment at the MNRE portal), ensure all three specify the exact same panel model and wattage, then compare apples to apples on price.
Red Flag 1: No Panel Model Number or Brand
The red flag: The quote says “330W solar panel” or “Tier-1 solar panels” without specifying the brand and exact model number.
Why it matters: Vague panel specifications allow the installer to substitute a lower-quality panel after you sign the contract. “Tier-1” is a financial term (from Bloomberg NEF’s bankability list) — it does not mean “high performance.” A Tier-1 rating can apply to a 20-year-old panel design.
What to demand: The quote must specify the exact panel model — for example, “Adani Solar 545W Mono PERC, Model AS-M672-BH-545” or “Waaree WS-530 Bifacial TOPCon.” This model number must appear in the BIS certification database and the MNRE’s Approved List of Models and Manufacturers (ALMM).
Red Flag 2: Inverter Brand and Model Missing
The red flag: The quote mentions “3 kW solar inverter” without naming the brand or model.
Why it matters: The inverter is the most failure-prone component in a solar system. Cheap no-brand inverters fail within 3–7 years. A Sungrow, ABB, SMA, or Havells inverter with a 5-year manufacturer warranty is fundamentally different from an unknown brand with a verbal “2-year” promise.
What to demand: Exact brand, model, efficiency rating (>97% acceptable), and warranty period (minimum 5 years standard; extended to 10 years with buyback warranty option). The inverter must carry BIS certification under IS 16221 Part 1/Part 2.
Red Flag 3: “25-Year Warranty” Without a Manufacturer Warranty Card
The red flag: The quote or sales pitch says “25-year warranty included” but offers no manufacturer warranty card, no warranty document number, and no process for claiming it.
Why it matters: This is one of the most common deceptions in Indian solar. A 25-year “company warranty” issued by a 3-year-old startup installer is worthless — the company will not exist in 25 years. The genuine 25-year warranty is a linear power output guarantee from the panel manufacturer (Adani Solar, Waaree, Vikram Solar, etc.), backed by the manufacturer’s balance sheet.
What to demand: A physical or digital manufacturer warranty card for each panel batch, showing the manufacturer’s warranty terms (typically: 10-year product warranty + 25-year 80.6% output guarantee). The warranty must be from the manufacturer, not the installer.
For details on what a legitimate solar panel warranty should include, see our solar panel warranty explained guide.
Red Flag 4: No MNRE Empanelment Number
The red flag: The quote has no MNRE empanelment number for the installation company.
Why it matters: MNRE empanelment is mandatory for any installer claiming PM Suryaghar subsidy. If your installer is not empanelled, your subsidy application will be rejected and you lose up to ₹78,000. Additionally, non-empanelled installers have not passed MNRE’s technical compliance checks.
What to demand: The installer’s MNRE Channel Partner / EPC empanelment number, verifiable at the PM Suryaghar portal or MNRE website. Heaven Green Energy’s empanelment numbers are available on our about page.
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No HSN Code Breakup in the Quote — A legitimate quote lists each component with its HSN code and GST separately. Without this, you cannot claim ITC (if eligible) and cannot audit the GST calculation. See our [GST on solar guide](/blog/gst-on-solar) for what to look for.
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No Net Metering Mention — If the quote doesn't address net metering application, DISCOM coordination, or bidirectional meter cost, the installer either doesn't offer this or plans to charge extra later. Net metering application support must be explicitly included in the scope of work.
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Unrealistically Low Prices — A 5 kW system quoted below ₹2,00,000 in 2026 is almost certainly using non-ALMM panels, uncertified inverters, or undersized wiring. MNRE's benchmark for 5 kW is ₹2,10,000 (pre-GST). Anything significantly below suggests component substitution or missing scope items.
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Mounting Structure Material Not Specified — Cheap GI (galvanised iron) mounting structures rust within 5–7 years in coastal and humid environments. Pre-galvanized or hot-dip galvanised steel or anodised aluminium should be specified. A quote that only says "mounting structure included" tells you nothing.
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DC Cable Specification Missing — Solar DC cables carry high-voltage DC current and must meet IS 694 / IEC 60227 standards with UV resistance. A quote that doesn't specify cable cross-section (4 mm² or 6 mm²) and whether it's solar-grade (double-insulated) may be using substandard wiring that creates fire risk.
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No AMC or Post-Installation Support Plan — After installation, your system needs annual cleaning, inverter monitoring, and connection checks. A quote with no mention of post-installation support or AMC options signals that the installer plans to disappear after payment. A good EPC company offers at minimum a 1-year AMC and paid AMC options thereafter.
⚠️ Watch out
In states where PM Suryaghar subsidy applications are filed through a portal (not directly by the homeowner), some installers file applications with incorrect system specifications to match the cheapest panel they can source — not the panel they actually install. This is subsidy fraud and can result in subsidy clawback from the homeowner.
The Solar Quote Verification Checklist
Use the Solar Quote Integrity Check before signing any contract. Your quote must have all of the following:
| Checklist Item | Required? | Action if Missing |
|---|---|---|
| Exact panel brand and model number | Mandatory | Reject quote |
| Panel ALMM listing verification | Mandatory (PM Suryaghar) | Verify at mnre.gov.in |
| Panel BIS certificate (IS 14286) | Mandatory | Ask for certificate copy |
| Inverter brand and model number | Mandatory | Reject quote |
| Inverter BIS certificate (IS 16221) | Mandatory | Ask for certificate copy |
| Manufacturer warranty card process | Mandatory | Get sample warranty card |
| MNRE installer empanelment number | Mandatory (for subsidy) | Verify at pmsuryaghar.gov.in |
| HSN-code GST breakup | Mandatory (for ITC) | Ask for revised quote |
| Net metering application scope | Mandatory | Confirm in writing |
| Mounting structure material spec | Mandatory | Ask for hot-dip galvanised |
| DC cable specification | Mandatory | Ask for IS 694 compliant |
| Payment terms (milestone-linked) | Mandatory | Never pay 100% upfront |
| Post-installation AMC terms | Strongly advised | Negotiate minimum 1-year |
On payment terms: Legitimate solar contractors typically take 30–40% advance, 50–60% on material delivery to site, and 10% on commissioning. Never pay 100% upfront. An installer demanding full payment before installation is a significant financial risk.
How to Verify a Quote Without Being a Technical Expert
You don’t need to be a solar engineer to do basic verification. Here is the 3-Step Quote Check for homeowners:
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MNRE Empanelment Check. Go to the PM Suryaghar portal (pmsuryaghar.gov.in) and search for the installer’s company name or GSTIN in the empanelled vendor list. If they don’t appear, they cannot file your subsidy application.
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ALMM Panel Check. Go to MNRE’s official ALMM list at mnre.gov.in. Search for the panel model number from the quote. If it’s not listed, it does not qualify for PM Suryaghar subsidy and may not be compliant with DISCOM technical requirements.
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Manufacturer Warranty Check. Call the panel manufacturer’s customer care (Adani Solar: 1800-572-2364; Waaree: 1800-123-5665) and ask if the model in your quote has an active 25-year output warranty. You can also verify panel BIS certification on the BIS product certification portal using the manufacturer’s licence number. This confirms you’re getting a genuine product, not a grey-market import.
Pros and Cons of Taking the Cheapest Solar Quote
- Lower upfront outlay — frees capital in the short term
- May still work for a few years if basic components are functional
- Non-ALMM panels forfeit PM Suryaghar subsidy (up to ₹78,000 lost)
- Cheap inverters fail in 3–5 years — replacement ₹30,000–₹80,000
- No warranty means no recourse for panel degradation
- Missing MNRE empanelment means DISCOM may reject net metering
How Heaven Green Energy Quotations Are Different
Every Heaven Green Energy quotation includes:
- Exact panel model with ALMM listing confirmation
- Inverter model with BIS certificate number
- Manufacturer warranty card process (physical cards delivered on commissioning)
- Our MNRE empanelment number (verifiable at MNRE portal)
- HSN code GST breakup for every component
- Net metering application scope included
- Milestone-linked payment schedule (never 100% upfront)
- 5-year warranty on workmanship + manufacturer warranty passthrough
- 1-year AMC included in every installation
Use our how to choose a solar contractor guide for a broader framework on selecting the right EPC.
- Residential Solar — PM Suryaghar-compliant installation with full ALMM + BIS documentation.
- Commercial Solar — detailed HSN-code invoices for ITC claims.
- Solar Calculator — check if the quoted system size matches your actual needs.
- Contact our team — get a verified quote within 48 hours.
Get a free site assessment. Our engineers visit within 24 hours and send a complete, itemised quote — no hidden fees, no component substitution, no pressure. Get your free quote →
Frequently Asked Questions
How do I verify if a solar installer is MNRE-empanelled?
Go to the PM Suryaghar portal and use the “Find a Vendor” feature to search by state, city, or installer name. You can also check the MNRE website directly at mnre.gov.in under the empanelled vendor list. If the installer doesn’t appear, they are not empanelled and cannot file your PM Suryaghar subsidy application.
What is the ALMM list and why does it matter for my solar panels?
The ALMM (Approved List of Models and Manufacturers) is a list maintained by MNRE of solar panels that have passed quality and technical compliance tests. Panels on the ALMM list are mandatory for PM Suryaghar subsidy-eligible installations. If your installer quotes a panel not on the ALMM list, your subsidy application will be rejected. Check the current ALMM list at MNRE’s website before agreeing to any panel specification.
Should I pay the full amount upfront for solar installation?
Never. A legitimate solar installation follows a milestone-linked payment schedule: typically 30–40% advance, 50% on material delivery, and the remaining 10% on commissioning and documentation handover. Installers who demand 100% payment upfront should be avoided — this is the most common way homeowners lose money to fly-by-night operators.
What should a 5 kW solar quote include in India in 2026?
A complete 5 kW solar quote in 2026 should include: exact panel brand/model (ALMM-listed), number of panels and total wattage, inverter brand/model (BIS-certified), mounting structure material and type, DC cable specification, ACDB/DCDB specifications, net metering application support, installer’s MNRE empanelment number, manufacturer warranty card process, GST breakup with HSN codes, and total installed cost inclusive of all taxes.
Is the cheapest solar quote always the worst quality?
Not always — but the gap between the cheapest and best value is rarely as large as it seems, because the price difference usually comes from using non-ALMM panels or cheaper inverters rather than genuine efficiency gains. A quote ₹10,000 cheaper than the average may use panels without BIS certification or an inverter without a manufacturer warranty. Check the component specification, not just the total price.
What questions should I ask a solar installer before signing?
Ask: (1) What is your MNRE empanelment number? (2) Is this panel model on the ALMM list? (3) Which BIS certification does the inverter carry? (4) How do I claim the manufacturer warranty if a panel fails in year 10? (5) What is included in the net metering application process? (6) What is the payment schedule? (7) What AMC do you offer after the first year? Read our questions to ask solar installer guide for the complete 15-question checklist.
