Your bill lists the kWh you used and the amount in rupees — averaging the last 12 months keeps the estimate realistic.

Each kWp cuts roughly ₹12,000 a year, before your roof area and pitch are taken into account.

We size to your own usage: kWp ≈ annual kWh ÷ 1,500, then cap it at what your roof area and pitch allow.

Plan on 8 m² of usable roof per kWp. A 3 kWp system wants roughly 24 m² of usable area after pitch loss.

Usable area shrinks with the cosine of the pitch, so a steeper roof caps the system size sooner.

First-year savings = kWp × 1,500 kWh × ₹8 per unit, capped by the usable roof area your pitch allows.

Payback = system cost ÷ first-year savings, using about ₹55,000 per kWp as the installed cost.

Not for savings — this is a grid-connected estimate. Add storage only if you specifically need backup power.

No — they run on your own figures and standard generation assumptions. A site survey confirms shading before we quote.