SOLAR SKOOL · FREE BEGINNER TOOL
How Many Solar Panels Do I Need?
Learn before you buy. Buy what you need.
Enter the energy you want to produce each day and the watt rating of one solar panel. Get a simple starting estimate in seconds.
Wh means energy used over time. Example: a 200 W appliance running for 5 hours uses 1,000 Wh.
W is the panel's rated power, not its guaranteed output throughout the day.
An adjustable planning assumption. Four sun-hours does not mean only four daylight hours.
Allows for less-than-ideal panel output. Real results vary with conditions.
STARTING ESTIMATE
2 panels
This is a learning estimate, not an installation design. Actual panel quantity depends on local sunlight, shading, orientation, weather, daytime loads, battery charging needs, equipment limits and system configuration. A qualified installer must verify the final design.
Series vs Parallel — the quick idea
Series: Panel voltages add up.Parallel: Panel currents add up.
Both arrangements have strict compatibility, voltage, current and safety requirements. Never connect panels yourself without suitable qualifications.
A taste of Solar SKOOL
This free calculator gives you a first answer. Our lessons explain how to make sense of panel ratings and choose equipment that fits your needs and budget.Explore Solar SKOOL →The calculator works offline after download. Opening Solar SKOOL requires internet access.
SOLAR SKOOL • Educational use only. Electrical and solar installation work must be performed by suitably qualified and authorised professionals.