3kW Solar System Price in India (2026)
| System Type | Gross Cost | Subsidy | Net Cost |
|---|
| On-grid | ₹1,56,600 – ₹1,91,400 | ₹78,000 | ₹78,600 – ₹1,13,400 |
| Hybrid (with battery) | ₹1,94,400 – ₹2,37,600 | ₹78,000 | ₹1,16,400 – ₹1,59,600 |
| Off-grid | ₹2,29,500 – ₹2,80,500 | ₹0 | ₹2,29,500 – ₹2,80,500 |
State top-ups in Delhi, Uttar Pradesh and Assam reduce the net cost further; the calculator above applies them
when you pick your state. For a full quote-style breakdown, use the
solar panel cost calculator.
What Can a 3kW Solar System Run?
A 3kW system generates about 11.5 units a day (346 units a month) in a typical Indian city. That
comfortably powers a complete mid-size household: fans, lights, fridge, TV, washing machine and a 1.5 ton inverter AC for several hours a day. It is India's most popular home size, matching bills of ₹2,200 to ₹3,200 and capturing the full ₹78,000 subsidy.
3kW Solar System Quick Specs
- Panels: 6 × 550W modules (fewer with 600 – 620W panels)
- Roof area: 240 – 300 sq. ft. of shadow-free space
- Generation: ~11.5 units/day, ~346 units/month, ~4,205 units/year
- Inverter: 3 kW string or hybrid inverter
- Payback: typically 3 – 6 years after subsidy, then 20+ years of low-cost power
Is 3kW the Right Size for You?
The 3kW system is India's default for a reason: it matches the 300 to 390 unit consumption of a typical one-AC household, and it is the smallest size that captures the entire ₹78,000 central subsidy, giving it the best subsidy-per-rupee on the market. Bills of ₹2,200 to ₹3,200 a month are the fit zone. Wrong-fit signs: two ACs running daily or a bill above ₹4,000, where 5kW serves better; or a sub-₹1,500 bill, where 3kW would mostly export at ₹3 a unit.
Worked Example: A 3kW System in Nashik
A Nashik home installs 3kW on-grid at about ₹1,74,000 gross. The full ₹78,000 subsidy applies, leaving a net
cost near ₹96,000. At the city's 4.9 peak sun hours the system produces
about 11.8 units a day (353 a month), trimming up to ₹2,700
off the monthly bill at the local ₹8.5 tariff. Run the calculator above with your own city to see
how these numbers shift with sun hours and state subsidies.
From 3kW Estimate to Installation
- Confirm the size against your usage with the
solar system size calculator; the right kW comes from your
units, not from a page you happened to land on.
- Check the connection. Most DISCOMs allow 3kW on single phase; a few ask for three phase above 3 to 4kW, so this size usually avoids that upgrade entirely.
- Collect three 3kW quotes and compare them line by line against the
cost calculator's gross range; quotes far below it are cutting
something you will miss later.
- Apply on the national portal before installing, use a registered vendor, and expect the
subsidy by bank transfer a few weeks after inspection.
3kW Mistakes to Avoid
- Letting the subsidy cap decide against your usage. If you consume 450+ units, buying 3kW "for the subsidy" leaves a third of your bill intact; the subsidy is identical at 5kW.
- Sizing from the mildest bill of the year. The one-AC home that fits 3kW on annual average may need 4kW if the AC count is about to grow.
- Treating the subsidy as an invoice discount. You pay the gross ₹1.6 to ₹1.9 lakh first; the ₹78,000 returns by bank transfer after inspection.
- Accepting a "3kW" quote of 5 × 545W panels. That is 2.7kW. Six modern panels or five 620W ones make a true 3kW; multiply it out on every quote.
How These 3kW Numbers Are Calculated
Daily units = 3 kW × Peak sun hours × 0.8
Net cost = Gross cost − Subsidy
Monthly saving ≈ Monthly units × Your tariff × 0.9
Assumptions
- Cost: on-grid ₹58,000/kW, hybrid ₹72,000/kW, off-grid ₹85,000/kW, ±10%
- Generation: your city's peak sun hours × 0.8 performance ratio
- Saving: assumes ~90% of generation offsets billed units at your tariff
