Solar
Solar Inverter Size Calculator
Estimate the inverter size required for your electrical load, including allowance for motor or compressor starting surge.
W
Add the wattage of appliances that may run at the same time.
W
Enter the running wattage of the largest refrigerator, pump, AC compressor or other motor expected to start while on the inverter.
%
Defaults are starting assumptions and can be edited where equipment specifications are known.
Suggested Standard Inverter Size
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Select an inverter with at least this continuous rating and confirm that its surge rating meets the requirement below.
Calculated Continuous Requirement
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Design Running Load
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Estimated Starting Surge
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Minimum Surge Capability
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How it is calculated:
Design running load = total running load × (1 + safety margin).
Continuous inverter requirement in kVA = design running load ÷ power factor ÷ 1,000.
Where a motor or compressor is entered, estimated starting load =
total running load + additional motor starting demand.
Starting demand is shown separately because inverter surge capability is usually specified independently from its continuous rating.