Calculate Your Savings with the Rainbow Solar Calculator
Wondering what switching to solar would really save you? Enter your PIN code and your electricity bill or the units on your EB bill, and the Rainbow Solar calculator estimates the right system size, the roof space it needs and what you could save every month, every year and over the system's life.
Why use the Rainbow Solar calculator?
- Estimate your savings: see how much you could save each month and over 25 years.
- Size your system: get the system capacity that matches your usage.
- Cost, subsidy & payback: know your cost after the government subsidy and when the system pays for itself.
- Roof space: learn how much shadow-free roof area you'll need.
- Environmental impact: see the CO₂ you'd avoid, in trees and kilometres driven.
Savings come from your actual tariff slabs: we work out your bill today, then your bill for the units you would still draw from the grid with solar. The estimate assumes net metering, so surplus units from sunny days are credited against what you use later. It also factors in a yearly tariff rise and gradual panel degradation for a realistic long-term picture.
How it works
- Enter your PIN code: it sets the sunshine for your area and, in Tamil Nadu, the TNPDCL slab tariff.
- Choose ₹ bill or EB units, monthly or every 2 months (TNPDCL bills every 2 months), then move the slider or type the exact value.
- See your system size, roof area, savings and environmental impact instantly.
Ready to go solar?
Your numbers are a starting point. Book a free consultation and a Rainbow Solar engineer will survey your roof, confirm the exact system and walk you through subsidy and EMI options, with no obligation.
