Yasir Hafeez is the founder and editor of SolarWattPro. He writes straightforward, actionable guides on home and business solar, battery storage and backup power, and builds the site's free calculators, so readers can plan the right system with confidence and move towards true energy independence.
The best fixed solar panel tilt is roughly equal to your latitude. Learn seasonal adjustments, a table by city, how much output you lose with flat or roof-pitch mounting, and which direction to face.
Each 400W solar panel needs about 21 square feet (2 m²) of roof. See how much space 5, 8, 10 and 15 kW systems need, how setbacks reduce usable area, and what to do if your roof is too small.
A home using 30 kWh per day needs roughly 7 to 11 kW of solar depending on sunshine. See panel counts, inverter and battery options, roof space and how to reduce the size.
A 1,000 kWh per month home needs about 7 to 10 kW of solar depending on location. See panel counts for 300W, 400W and 450W panels and the exact formula.
A 10kW solar system makes about 40 kWh a day (1,216 a month) in the US and 48 kWh in Australia. See how it runs central AC, EV charging and a whole home, plus panels and battery size.
A 5kW solar system makes about 20 kWh a day (608 a month) in the US and 24 kWh in Australia. See which appliances it runs, including EV charging and AC, plus panels and battery size.
A 3kW solar system makes about 12 kWh a day in the US, 7 kWh in the UK and 14.4 kWh in Australia. See which appliances it runs, how many panels it needs and what battery suits it.
A 1kW solar system makes about 4 kWh a day in the US and 2.3 kWh in the UK. See what it runs in a cabin, RV, shed, boat or balcony setup, and why a whole home needs more.
Peak sun hours are not daylight hours. Learn what they are, typical values for the US, UK, Canada, Germany and Australia, and how to look up the exact figure for your location.
Calculate how many kWh a solar panel produces per day from its wattage and your peak sun hours, with daily output tables for 100W, 200W, 300W, 400W and 500W panels.
