---
title: "Solar Savings Calculator for Kerala Homes"
description: "Free solar calculator for Kerala: enter your monthly bill and roof area for an indicative system size, cost band and payback period. No sales call."
url: "https://power-electricals.org/tools/solar-savings-calculator"
updated: "2026-09-12"
site: "Power Electricals & Contractors"
---

# Solar savings calculator for Kerala homes

Enter your monthly bill and roof area for an indicative system size, cost band and payback period — no sales call, nothing leaves your browser.

A rooftop solar system is sized by two things pulling against each other: how much electricity you actually use, and how much roof you have to put panels on. Your bill tells us the first. In Kerala a kilowatt of panels generates roughly 4 units a day averaged over the year, so a bill implies a number of units, and those units imply a capacity. The roof then caps it — about 80 sq ft of clear, unshaded roof per kilowatt.

Where the roof is the binding constraint, the honest answer is a system that offsets part of your bill rather than all of it, and that still pays. What we will not do is size past your consumption: exported units are worth considerably less than the units you avoid buying, so a system built to beat your meter rather than match it takes longer to pay back, not shorter.

The number this calculator is least certain about is the tariff. KSEB's domestic rate is steeply slabbed, so a heavy user saves more per unit than a light one and a single blended rate flatters one and shortchanges the other. That is why the output is a band and why the payback is approximate. The site assessment is where your actual slab, your roof's orientation and any shading get measured rather than assumed — and it is free.

> This page hosts an interactive calculator. The reasoning behind it is
> reproduced above in full; the figures it produces are indicative and a
> free site assessment is what turns them into a quote.

## Questions

### How accurate is this estimate?

It is a planning figure, not a quote. It uses typical Kerala conditions — about 4 units per kW per day and a blended tariff — and it cannot see your roof's orientation, its shading through the day, the state of your structure, or which KSEB slab you actually sit in. Those move the answer, sometimes materially. Treat the output as a band worth checking, which is exactly why the site assessment costs nothing.

### Why does the cost show a range instead of a price?

Because it genuinely is a range. Panel tier, inverter brand, the state of the roof structure, cable runs and mounting all move the per-kW cost, and larger systems cost less per kW because the fixed costs spread further. Quoting you a single figure the surveyor then contradicts would be worse than being upfront about the spread.

### What size systems do you install?

We design and commission systems from 3 kW to 25 kW, and we have delivered 40+ of them with DC/AC conversion and grid synchronisation. Below 3 kW a grid-tied rooftop system rarely earns its keep, so we will tell you honestly if that is where you land.

### Does the estimate include subsidy?

No. The cost band is the installed cost before any subsidy, because subsidy schemes and their eligibility rules change and we would rather not quote you a net figure that quietly goes stale. We will talk you through what currently applies to your connection when we visit.

## Contact

- **Business:** Power Electricals & Contractors
- **Phone:** +91 94954 45043 / +91 92076 25043
- **WhatsApp:** +91 92076 72138
- **Email:** power4electricservices@gmail.com
- **Address:** Convent Road, Kothavara P.O, Vaikom, Kottayam, Kerala — 686607
- **Hours:** Mon–Sat, 9:00 AM – 7:00 PM IST
- **Free site assessment:** yes, with no obligation