Solar Generation Calculator
Solar Generation Calculator — quick estimate
How many units will a solar plant actually produce? Set the size and a realistic site yield and see annual, monthly and daily generation — including the seasonal spread vendors' single-number pitches skip.
Your plant
Default yield 1,500 units/kWp/yr is the north-India planning band; drag it to match your site. Seasonal spread shown as ±15% around the monthly average.
Get a simulated generation report for your roof — free
We'll run your coordinates and roof through irradiance data and send the month-by-month generation a lender would accept, with the plant design behind it.
Your request is in
Thanks! Our solar team will send your simulated generation report within one business day.
Indicative planning figures — a bankable number needs an irradiance simulation for your coordinates, roof orientation, tilt and a shading survey. That is what an engineered proposal contains.
Questions engineers and CFOs ask
How many units does 1 kW of solar generate per day in India?
Around 4 units a day averaged over the year in north India — roughly 1,350 to 1,650 units per kWp per year depending on the site. Summer days run well above the average and December-January fog and winter sun run below it, which is why annual figures are the honest way to plan, not one good May afternoon.
Why does my plant generate less in winter if the panels run cooler?
Cooler panels are indeed more efficient, but winter sun is lower, days are shorter and north-India fog can wipe out whole mornings. The irradiance loss far outweighs the temperature gain, so December generation is typically the year's lowest even though panel efficiency is at its best.
What reduces generation below the calculated figure?
Soiling is the big one — dust costs several percent even with monthly cleaning, more near Delhi NCR. Then shading (even a parapet line at 4 pm), inverter clipping if the DC-AC ratio is aggressive, cable losses, downtime nobody noticed, and module degradation of roughly half a percent a year after the first-year step. A generation guarantee in your EPC contract is how you make these someone's problem.
How accurate is a yield of 1,500 units per kWp?
It is a fair planning band for a well-designed, unshaded plant in Punjab, Haryana, Delhi NCR or western UP. A real proposal replaces it with a simulation using satellite irradiance data for your coordinates, your actual roof orientation and tilt, and a measured shading survey — that number is what a lender will accept, and it is the one we quote against.
Need an exact BOQ, rate analysis or measurement sheet?
This is a quick engineering estimate. For tendering, billing or audit, our QS & estimation team prepares an item-wise BOQ, rate analysis and a verified measurement sheet to IS / CPWD norms — backed by 15+ years and ISO 9001:2015 quality processes.