Guides
Guides
One page per question, with the numbers already worked out for the common cases. Every table is produced by the same formulas as the tools, so you can open the tool and change any figure.
Solar panel calculator
Open the tool- How many solar panels for 2,000 kWh a month?2,000 kWh a month is 65.8 kWh a day: 43 panels of 400 W (17.2 kW) at 4.5 sun hours, about $44,720 installed. Every US state and UK city.Solar panel calculator
- How many solar panels to power a house?Panels for the average US home (EIA 899 kWh a month) from half to twice that use, every US state, and Ofgem's low, medium and high UK homes in four cities.Solar panel calculator
- How many solar panels to produce 30 kWh per day?20 panels of 400 W (7.75 kW) make 30 kWh a day at 4.5 peak sun hours; 25 at 3.5 hours, 16 at 5.5. 5 to 50 kWh a day, every US state and UK city.Solar panel calculator
- How many solar panels for 1,000 kWh a month?1,000 kWh a month is 32.9 kWh a day: 8.5 kW of solar, 22 panels of 400 W, at 4.5 sun hours. Sizes at 3 to 6 sun hours, every US state and UK city.Solar panel calculator
- How many solar panels for 1,500 kWh a month?1,500 kWh a month is 49.3 kWh a day: 12.7 kW of solar, 32 panels of 400 W, at 4.5 sun hours. Sizes at 3 to 6 sun hours, every US state and UK city.Solar panel calculator
- How many solar panels for 2,500 kWh a month?2,500 kWh a month is 82.2 kWh a day: 21.2 kW of solar, 54 panels of 400 W, at 4.5 sun hours. Sizes at 3 to 6 sun hours, every US state and UK city.Solar panel calculator
Solar payback calculator
Open the tool- How much do solar panels cost in the UK in 2026?Around £7,600 for a typical 4.5 kWp system (Energy Saving Trust, 2026), £1,690 per kWp; 6 to 16 panels, savings at the Ofgem cap, payback by UK city.Solar payback calculator
- How much do solar panels cost in Texas in 2026?Installed cost for 4 to 15 kW at the EnergySage $ per watt, Texas output and savings at the EIA price, a 7 kW system in every state and the 25-year table.Solar payback calculator
- How much do solar panels cost for a 2,000 square foot house?About $22,880 before incentives: 22 panels of 400 W (8.8 kW) cover the 12,173 kWh a year an average 2,000-2,499 sq ft home uses (EIA), at 4.5 sun hours.Solar payback calculator
Solar output calculator
Open the tool- How many kWh does a solar panel produce per day?One 400 W panel per day, month and year at 3 to 6 sun hours, 1 to 12 kW systems, a panel and a 10 kW system in every US state, UK cities by month.Solar output calculator
- How much electricity does a 4 kW solar system generate in the UK?A 4 kW solar system produces about 4,369 kWh of electricity a year in London (12 kWh a day): 3,616 in Glasgow to 4,897 in Brighton. Month by month.Solar output calculator
- How much electricity does a 3 kW solar system generate in the UK?kWh a day, month and year from a 3 kWp system in every UK city, month by month in three cities (PVGIS), and against Ofgem household use.Solar output calculator
- How much electricity does a 5 kW solar system generate in the UK?kWh a day, month and year from a 5 kWp system in every UK city, month by month in three cities (PVGIS), and against Ofgem household use.Solar output calculator