Calculator Library
Every calculator on this site, grouped by topic, free to use.
Home & Shed Solar
Solar for the house, shed and workshop.
Daily Power Needs
List what you run in your home, shed or workshop and work out the daily energy (kWh) and peak load your solar system has to supply.
Open calculator → Home & Shed Solar12V / 24V / 48V Picker
Enter your biggest inverter load and daily energy to see the battery current at 12V, 24V and 48V, and which system voltage suits your shed, workshop or home.
Open calculator → Home & Shed SolarSolar Array Size
Work out how many watts of solar panels you need from your daily energy use and winter peak sun hours, and how many panels that is.
Open calculator → Home & Shed SolarInverter Size
List the tools and appliances you run at once, allow for motor start-up surge, and find the inverter size and battery current for your workshop or shed.
Open calculator → Home & Shed SolarMPPT Controller Size
Enter your panels and battery voltage to find the MPPT charge controller current and the cold-morning panel voltage it must handle.
Open calculator → Home & Shed SolarSolar Payback
Use your own quote, bills and feed-in tariff to estimate how long a home solar system takes to pay for itself, or compare an off-grid shed with a cable run or generator.
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