How many solar panels do I need?
A five-step formula to turn your electricity bill into a panel count, with a worked example.
Read the guidePlain-language guides with worked examples. Every number comes from the same formulas as the calculators on this site.
A five-step formula to turn your electricity bill into a panel count, with a worked example.
Read the guideConvert horsepower to kW, size the solar array and estimate daily water for pumps up to 200 hp.
Read the guideA simple method to size a solar battery in kWh, and why battery type changes what you buy.
Read the guideChoose between grid-tied, hybrid and off-grid solar with a quick table and the questions that decide it.
Read the guideHow the two controller types differ, how much power you gain, and how to size one.
Read the guideAdd up your loads, allow for start-up surge, and match the inverter to your system type.
Read the guide