Solar Inverter Calculator
Enter your appliance load and estimate inverter size, number of 500W panels and batteries needed.
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Estimate only
This calculator gives a planning estimate. Real installations should also consider surge load, cable size, charge controller rating, battery type, inverter efficiency, roof direction, shading and installer safety checks.
Solar Calculator FAQs
How does this calculate inverter size?
It adds your running appliance watts and applies extra headroom so the inverter is not sized too tightly.
Why use 500W panels?
500W panels are a common modern panel size. You can change the panel wattage if your supplier offers a different rating.
Why does battery type matter?
Lead-acid batteries should usually not be drained deeply, while lithium batteries can often use more of their rated capacity. That changes the estimated battery count.