Published 15 July 2026 · GenSolar Energy

Current price bands

A 1 kW residential system in Tamil Nadu runs roughly Rs 75,000 to Rs 90,000. A 2 kW system lands between Rs 1,35,000 and Rs 1,60,000. The most common size, 3 kW, ranges from Rs 1,90,000 to Rs 2,30,000. A 5 kW system is typically Rs 3,00,000 to Rs 3,60,000 and 10 kW falls between Rs 5,80,000 and Rs 6,80,000. Per-kilowatt cost drops as size increases because the inverter, cabling, labour and paperwork are largely fixed.

What moves the price

Four things account for most of the variation: panel brand and cell technology, inverter make, mounting structure height, and cable run length. An elevated structure that preserves terrace usability adds fabrication cost. A long DC run from a rear terrace to a front meter board adds cable and conduit. Coastal sites in Besant Nagar, Thiruvanmiyur or Kelambakkam need anti-corrosion treatment. None of these are optional extras invented at billing time — insist that they appear in the quote before you sign.

Tier-1 mono PERC vs TOPCon or bifacial modules
String inverter brand and warranty term
Standard vs elevated or canopy structure
Distance between array and meter board

Net cost after subsidy

Apply the PM Surya Ghar slab and the picture changes sharply. A 3 kW system quoted at Rs 2,10,000 receives Rs 78,000 back into the customer's bank account after commissioning. Against a household that was paying Rs 3,500 to Rs 4,500 a month to TANGEDCO, that puts payback in the three to four year range on an asset with a 25-year module performance warranty.

Where cheap quotes hide cost

Very low quotes usually cut somewhere specific: non-ALMM modules that disqualify you from the subsidy, an undersized or off-brand inverter, thin structural sections that rust within a few monsoons, or no net-metering liaison at all. Compare quotes on the module model number, inverter model number, structure specification and what happens in year three when something needs service.