Rooftop solar · India
Solar numbers, without a salesman
We do not install solar and we do not sell it. Nobody pays us. So we can tell you the things installers leave out, like where the subsidy stops and when a battery is a waste of money.
Same amount whether you build 3 kW or 10 kW
Most calculators pretend this does not happen
This is what actually makes solar worth it
Calculators
Solar System Size Calculator
The kW you need, worked out from your bill or your units.
PM Surya Ghar Subsidy Calculator
What you actually get, and why it stops at 3 kW.
Solar Payback and Savings Calculator
25 years worked out year by year, not multiplied by 25.
Roof Area and Panel Count Calculator
Roof space needed, or what fits on the roof you have.
Solar Battery Sizing Calculator
Battery size for backup, and whether you need one at all.
Appliance Load Calculator
Add up your appliances to find your monthly units.
Net Metering Savings Calculator
What your state pays for the units you send back.
Solar Loan EMI Calculator
Whether your bijli savings will cover the EMI.
Three things installers will not tell you
Search for solar in India and almost every result is a company trying to sell you a system. Their calculators are advertising. Here are the parts they leave out.
1. Subsidy stops at 3 kW
You get ₹78,000 for a 3 kW system. You also get ₹78,000 for an 8 kW system. Every kilowatt after the third one is at full price. Nobody selling you a big system says this first.
2. Most homes do not need a battery
A battery nearly doubles your cost and gives you backup, not savings. If your area has decent power supply, skip it. Buy a battery because you want power during cuts, not because someone showed you a payback number.
3. Payback numbers are usually wrong
Most calculators take your first year saving and multiply by 25. That assumes electricity in 2050 costs the same as today. It will not. It also ignores that panels get weaker each year. We calculate all 25 years one by one and show you both answers.
By state
Guides
PM Surya Ghar Subsidy: What You Actually Get
The subsidy is not a percentage. It is paid in slabs and it stops at Rs 78,000.
Why Most Solar Payback Numbers Are Wrong
Electricity in 2050 will not cost what it costs today. Most calculators pretend it will.
Net Metering vs Net Billing: Why It Decides Your System Size
Same panels, same sun, very different savings. It depends on what your state does with your extra units.
3 kW Solar System Price in India: Full Cost Breakdown
3 kW is where the subsidy stops. That single fact makes it the most important size in Indian solar.
Do You Actually Need a Solar Battery?
A battery does not lower your bill. It keeps the lights on. Those are different problems with different answers.
How Much Roof You Need, and What Shading Does to Solar
A roof that looks big enough often is not. And a roof with one shaded corner may be worse than a smaller clear one.
How to Read a Solar Quotation Line by Line
A good quotation names brands and models. A bad one says "high quality panels" and hopes you do not ask.
How Many Units Will Your Solar Actually Make?
A 3 kW system does not make 3 units an hour. Here is what it really makes, and why.
PM Surya Ghar: How to Apply, Step by Step
Filling the form takes twenty minutes. Everything after it is waiting, and the waiting is not on your side of the table.
Why Solar Subsidy Applications Get Rejected
Rejections are almost never about the roof or the equipment. They are about documents that do not agree with each other.
On-Grid vs Off-Grid vs Hybrid: Which One You Need
Most people who ask for a hybrid system are describing a problem an on-grid system already solves.
Mono PERC vs Poly vs TOPCon vs Bifacial
Efficiency only matters when roof space is the binding constraint. Otherwise you are paying for watts per square metre you do not need.
What Keeps Solar Output Up for 25 Years
Dust, one shadow and one inverter. Three things decide how much of your 25 years you actually collect.