Solar System Size Calculator
Estimate the right rooftop solar system size for your home or small property based on monthly electricity bill, monthly units consumed, roof availability, and basic usage context.
Estimate your solar system size
Use monthly units if you know them. If not, your electricity bill can still give a strong planning estimate for the right rooftop solar size.
Enter your average monthly bill in rupees if that is the number you know best.
If you know your monthly units from the bill, enter them here for a more direct system size estimate.
This lightly tunes usage fit and recommendation wording.
Optional. Used to suggest a tariff baseline when units are not provided directly.
Optional. Helps interpret whether the suggested size appears comfortable or roof-constrained.
How to choose the right solar size
- If you enter monthly units, we size the system directly from your electricity use; otherwise we estimate units from bill amount and tariff assumptions.
- We convert that usage into a recommended kW size using shared rooftop generation factors suitable for India-focused solar planning.
- We then estimate roof area, generation, cost range, and likely monthly savings so you can compare a realistic set of system size options.
Solar system size FAQ
This section can later cover questions about 1 kW vs 3 kW vs 5 kW systems, roof area needs, units offset, and how to choose the best size for your household or small business.
Your solar size recommendation
These outputs help you understand a likely solar plant size, a suitable range, expected generation, roof requirement, cost range, and practical monthly savings direction.
Recommended solar size
0 kW
The main recommended rooftop solar size based on your usage inputs.
Suitable size range
0 kW - 0 kW
A practical range to discuss with installers depending on roof, budget, and consumption pattern.
Estimated monthly generation
0 units
Expected monthly solar generation under shared planning assumptions.
Estimated yearly generation
0 units
Approximate annual solar output from the recommended system size.
Approximate roof area needed
0 sq ft
Indicative shadow-free rooftop area required for the recommendation.
Indicative installation cost
Rs 0 - Rs 0
A planning range for upfront project cost before vendor quotation.
Possible monthly savings
Rs 0
A simple estimate of how much monthly grid cost could be offset.
Result interpretation
Waiting for inputs
A plain-language interpretation of who this solar size may suit.
What this means
This calculator converts your bill or energy use into a practical rooftop solar size using shared India-focused generation, roof area, and cost assumptions. The result is meant to guide shortlisting, not replace a detailed site survey.
Want nearby verified vendors for the right solar size?
Use this system size estimate to compare verified installers, rooftop feasibility advice, and actual project pricing from trusted solar vendors.
Find Nearby Solar VendorsSystem size estimate disclaimer
This system size estimate is directional only. Final sizing depends on roof shape, usable shadow-free area, sanctioned load, daytime usage pattern, module layout, local generation conditions, and vendor design.