Solar & battery
Solar Inverter Quantity Calculator
How many inverters or microinverters a system needs, for string and module-level equipment.
Result
Module-level electronics cost more up front and are usually required by rapid-shutdown rules in many jurisdictions. They also handle partial shading far better, because one shaded panel no longer drags a whole string down. A string inverter is simpler and cheaper on an unshaded roof with a single plane.
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About this calculator
String, micro or optimiser?
String for a simple unshaded roof on one plane. Microinverters or optimisers where there is shading, several roof planes or a rapid-shutdown requirement that string equipment cannot meet.
Which lasts longest?
String inverters typically carry 10 to 12 year warranties and are replaced once in a system's life. Microinverters carry 25 year warranties but there are dozens of them on a roof, so a failure means going back up.
The formula
string inverters = AC capacity needed / inverter rating; microinverters = one per panel
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