1 kW, 2 kW or 3 kW: which solar system suits your bill?
Your KSEB bill already tells you the right size. Here is how to read it.
Step 1: find your units
KSEB bills domestic consumers every two months. Look for the units consumed on your bill and divide by two to get your monthly use. If you can, check a few bills across the year, because use goes up in summer.
Step 2: match units to size
In Kerala, one kilowatt of panels typically produces around 4 units a day, or about 120 units a month. Output depends on shading, roof direction and the monsoon months.
| System size | Suits monthly use of | Approx. generation | Central subsidy |
|---|---|---|---|
| 1 kW | 0 – 150 units | ~120 units/mo | ₹30,000 |
| 2 kW | 150 – 300 units | ~240 units/mo | ₹60,000 |
| 3 kW and above | above 300 units | ~360 units/mo | ₹78,000 |
Step 3: check the roof
Each kilowatt needs roughly 80–100 square feet of shade-free roof. Trees, water tanks and neighbouring buildings can cast shadows, so we check the roof at different times during the site visit.
Why 3 kW is the most common choice
- The subsidy reaches its maximum of ₹78,000 at 3 kW.
- A 3 kW system produces around 300–360 units a month, which covers most Kerala homes.
- Going above 3 kW does not increase the subsidy, so only choose more if your use is high.
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