Verify the business
Confirm the legal business name, current contact details, physical service area, responsible person, and any registration or certification the company claims.
Compare the same scope
Ask every bidder for the same panel, inverter, battery, structure, protection, wiring, labor, paperwork, tax, and transport breakdown.
Keep written evidence
Save the signed quote, model numbers, serial numbers, invoices, warranty terms, payment milestones, commissioning report, and monitoring access.
01
Identity and claim checks
Ask for the exact legal or trading name, office and service addresses, responsible contact, tax or business registration details when claimed, and recent customer references. Verify claimed certificates, brand authorizations, memberships, and registrations directly with the organization that issued them. A logo on a quotation is not independent proof.
02
Site survey and system design
A serious proposal should account for recent electricity bills, daytime and nighttime usage, roof dimensions, shade, structure condition, cable route, earthing, backup circuits, future load, and local utility requirements. Ask who designed the system and who is responsible for electrical and structural safety.
03
Itemized bill of materials
Require the exact panel model and quantity, inverter model and rating, usable battery capacity where applicable, mounting structure specification, DC and AC breakers, surge protection, isolators, earthing, cable brands and sizes, monitoring equipment, labor, transport, taxes, and filing charges. Do not compare quotes using only a total price or rupees per kW.
04
Warranties and after-sales support
Separate manufacturer product warranties from installer workmanship warranties. Confirm the warrantor, start date, exclusions, claim documents, visit charges, response time, and who handles a manufacturer claim. Keep invoices and serial-number records for every major component.
05
Net-billing and utility paperwork
Ask exactly which application steps, drawings, inspections, fees, meter work, and follow-ups are included. Eligibility, approval, timing, tariff treatment, and export credit are controlled by the relevant authorities and utility; an installer should not present approval or savings as guaranteed.
06
Contract, payments, and handover
Use a written scope with milestones, completion criteria, change-order rules, delay handling, cancellation terms, and warranty contacts. Link payments to agreed deliverables. At handover, collect test results, equipment records, manuals, monitoring credentials, photographs, warranty documents, and a final paid invoice.
Safety comes before price
Solar installations involve high-voltage DC, AC wiring, roof work, batteries, fire risk, and utility interconnection. Use appropriately qualified professionals and obtain a site-specific design before installation.
Create one system estimate before requesting quotes.
Use the same bill, usage, city, system type, and backup assumptions when you brief each installer. That makes differences in equipment and scope easier to identify.