How to Choose a Solar Installer in India: What to Check Before Signing
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Why Installer Choice Is the Most Important Solar Decision
The quality of your solar experience — from installation accuracy to post-commissioning support — depends more on your installer than on the panels themselves. A good installer with average panels will outperform a poor installer with premium equipment. Getting this choice right is worth the extra time.
Step 1: Start With Empanelment Verification
If you plan to apply for PM Surya Ghar subsidy or set up net metering, your installer must be empanelled by your DISCOM (Electricity Distribution Company). Check empanelment directly at pmsuryaghar.gov.in — do not rely on the installer’s claim alone.
For installations where subsidy is not a concern (commercial systems, off-grid systems), empanelment is less critical but DISCOM registration still helps for smoother net metering approvals.
Step 2: Request a Detailed Written Quotation
A serious installer will provide a formal written quotation that includes:
- Specific panel brand and model with rated wattage per panel
- Inverter brand and model (on-grid, hybrid, or off-grid)
- Total system capacity in kWp
- Estimated annual generation in kWh
- Complete cost breakdown — panels, inverter, mounting structure, wiring, installation, GST
- Net metering application assistance — whether included and at what cost
- Warranty terms for panels, inverter, and workmanship
If a quotation only shows a total price with “solar system,” it is not adequate. Request the breakdown — if the installer refuses, walk away.
Step 3: Verify Equipment Quality
You do not need to be a technical expert to check the basics:
Panels: Ask for the datasheet of the panel model being quoted. Look for Tier-1 manufacturers (Waaree, Adani, Tata, Vikram Solar, Renewsys, and international brands like JA Solar or Longi). Check the panel’s efficiency rating and warranty terms on the manufacturer’s website.
Inverter: The inverter is the system’s brain. Ask for the brand and model. Common reliable brands in India include Sungrow, Growatt, Delta, SMA, and ABB/Fimer. Check that it is compatible with your grid’s voltage and has appropriate certifications (BIS, IEC).
Mounting structure: Should be hot-dip galvanized or aluminium to resist rust. Ask about the gauge of the structure and how it is fixed to your roof — proper waterproofing at mounting points is important.
Step 4: Check the Payment Terms
A milestone-based payment structure protects you from non-delivery and poor workmanship:
- 10–20% on contract signing
- 60–70% on delivery of materials to your premises
- Remaining 10–20% after commissioning and net metering approval
Avoid any installer who asks for 80–100% upfront. This is the single most common pattern in solar fraud cases.
Step 5: Ask About After-Sales Support
Solar panels last 25+ years but inverters and connections require periodic attention. Ask:
- What is the AMC (Annual Maintenance Contract) cost, and what does it cover?
- How quickly will you respond to a service call if the system stops working?
- Is monitoring (app-based or otherwise) included?
- Who handles warranty claims — you or the installer?
An installer who cannot answer these questions clearly has probably not thought through their service model.
Step 6: Verify References
Ask for contact details of two or three customers who had similar systems installed in the last 12–18 months. Ask those customers:
- Was the installation completed on the promised timeline?
- Did any issues arise, and how were they handled?
- Is the system generating as estimated?
- Would you use this installer again?
A reputable installer will provide references without hesitation.
Red Flags to Avoid
- Pressure to sign and pay within 24–48 hours (“subsidy deadline” urgency tactics)
- No written quotation or refusal to specify equipment models
- Full payment demanded upfront
- No mention of net metering or DISCOM coordination
- Cannot provide DISCOM empanelment proof
- No manufacturer warranty documentation offered
For more buyer protection guidance, see our dedicated Solar Buyer Protection page, which includes a full pre-contract checklist.
Frequently Asked Questions
How many quotes should I get before choosing an installer?
Get at least two to three detailed quotes. This helps you understand market pricing for your system size and location, and lets you compare equipment, warranties, and service terms — not just the headline price.
What is DISCOM empanelment and why does it matter?
DISCOM empanelment means the installer is approved by your local electricity distribution company to install grid-connected solar. If you want to apply for PM Surya Ghar subsidy or net metering, your installer must be empanelled. Always verify empanelment directly on pmsuryaghar.gov.in.
Should I pay the full amount upfront?
No. A milestone-based payment schedule is standard practice. A typical structure is 10–20% on signing, 60–70% on delivery of materials, and the balance on commissioning. Avoid any installer who demands full payment before installation begins.
What warranty should a solar system come with?
Solar panels from reputable manufacturers typically carry 25–30 year performance warranties and 10–12 year product warranties. Inverters usually carry 5–10 year warranties. Ask your installer to provide written warranty documents from the manufacturer — not just a verbal promise.
Can I check an installer's past work?
Yes. Ask for references from recent customers with similar system sizes in your area. A reputable installer should be willing to connect you with satisfied past customers. You can also check Google reviews, but independently verifying a few installations is more reliable.