From bill to units
Your bill is divided by an assumed blended tariff of ₹8 per unit to approximate monthly consumption. Your actual tariff depends on consumer category and slab structure.
Calculator
Solar savings calculator
Enter your electricity bill to see an indicative system size, generation, savings and payback — with every assumption shown on screen.
Solar savings calculator
Estimate your solar potential
Enter your electricity spend to see an indicative system size and savings range. A site assessment replaces these estimates with real numbers.
Billing cycle
Indicative results
- Estimated system size
- Estimated annual generation
- Estimated annual savings
- Estimated 25-year savings
- Indicative payback
- Approx. area needed
Indicative estimates only. Actual system size, generation, savings and payback depend on site conditions, tariff structure, consumption profile, system design and applicable policies. Calculated using an assumed ₹8/unit blended tariff, 1,450 units per kW per year and 80 sq ft per kW.
Get a Detailed Solar AssessmentAbout these numbers
How the estimate is built
From units to capacity
Annual consumption is divided by an indicative yield of 1,450 units per kW per year for the Chennai region to arrive at a system size.
From capacity to savings
Savings assume roughly 85% of generation is valued at the tariff. Export treatment depends on prevailing net-metering rules.
Calculator FAQs
How accurate is a solar savings calculator?
It is a planning tool, not a quotation. It assumes an average tariff, a typical generation yield for the Chennai region and standard area per kW. Your actual figures depend on tariff category, consumption pattern, shading, roof area and system design.
Why does the calculator ask for my roof area?
Because roof area often limits system size more than consumption does. If you enter an area, the estimate is capped at what that area can physically hold at roughly 80 sq ft per kW.
What happens after I get an estimate?
A GLS engineer reviews your consumption and site, carries out an assessment and replaces every estimate with designed values — capacity, expected generation, scope and cost.
Get a Detailed Solar Assessment
An engineer-verified assessment replaces every estimate above with designed values for your site.