Estimated solar array
2.16 kW
Energy-only sizing at 80% system efficiencyHow this calculator helps
Estimate the array capacity needed to supply an air conditioner's daily energy use. The calculation combines AC electrical input, expected runtime and peak-sun-hours, then applies a system-loss allowance and converts capacity into panel count.
How to use it
- 1
Find AC electrical input watts on the label or measure typical input.
- 2
Estimate daily cooling hours and representative peak-sun-hours.
- 3
Use the result for energy planning, then size inverter, battery and surge capacity separately.
Formula and methodology
Required solar kW = AC input kW ร daily runtime รท peak-sun-hours รท system efficiency. Panel count uses a 580 W reference panel.
Worked calculation example
A 1,500 W AC running six hours uses 9 kWh daily. At 5.2 peak-sun-hours and 80% efficiency, the starting array estimate is about 2.2 kW or four 580 W panels.
What can affect the result?
Compressor cycling
Inverter AC input changes with room heat and temperature setting.
Day versus night
Evening use requires stored or grid energy rather than same-day direct solar alone.
System losses
Heat, dust, wiring and inverter conversion reduce delivered solar energy.
Limits of this estimate
This energy-balance estimate uses 80% system efficiency and 580 W panels; it does not size batteries, inverter surge, roof layout or electrical protection.
Frequently asked questions
Is the solar AC calculator free?๏ผ
Yes. SolvePilot tools are free, work in your browser, and require no account.
Does SolvePilot store my values?๏ผ
No. Calculations run locally in your browser and the values you enter are not sent to a server.
Should I treat the result as an exact bill or quotation?๏ผ
No. Results are informed estimates. Final charges can vary because of taxes, tariffs, lender terms, usage patterns, or provider rules.
How can I improve the accuracy?๏ผ
Use recent values from your own bill, statement or institution, review every assumption, and confirm important results with the relevant official source.
Does this include night-time battery operation?๏ผ
No. The array estimate covers energy production; night use requires separate battery and inverter sizing.