Buy from verified suppliers in Kolkata, West Bengal. Compare prices, get free quotes, PM Surya Ghar subsidy ₹78,000.
Electricity costs ₹6.5–9/unit via CESC. See your payback period in seconds.
A battery is only needed if you want backup during power cuts or run off-grid. Lithium (LiFePO4) batteries last longer and need no maintenance; a 51.2V 100Ah (about 5 kWh) lithium battery costs roughly ₹45,000–80,000, while a 100Ah lead-acid battery costs about ₹8,000–11,000. Batteries attract 18% GST and are not covered by the PM Surya Ghar subsidy.
| Type | Typical life | Note |
|---|---|---|
| Lithium (LiFePO4) | 3,000–6,000 cycles | No maintenance, compact |
| Tubular lead-acid | 1,200–1,500 cycles | Low upfront cost, needs water top-up |
| SMF/VRLA | 500–1,000 cycles | Sealed, shorter life |
A 3 kW rooftop system in Kolkata generates about 360 units a month. At CESC's tariff of ₹6.5–9/unit, that saves roughly ₹2,800 a month (₹33,600 a year). After the ₹78,000 PM Surya Ghar subsidy, a 3 kW system costs about ₹82,000–1,32,000, so it pays back in roughly 2.4–3.9 years. CESC handles net metering in Kolkata, West Bengal; your installer usually files the application. Get a precise figure with the solar calculator.
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