Solar Wire Size Calculator
Size a copper PV conductor from current, one-way distance, system voltage, allowable voltage drop and ampacity margin.
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transparent result
Calculator inputs
Solar Wire Size Calculator results
How the calculation works
The calculator checks both current capacity and DC voltage-drop resistance over the round-trip conductor length.
What to verify
PV wire sizing also depends on temperature, conduit fill, rooftop correction, overcurrent devices and applicable electrical code.
How accurate is this calculator?
It is a transparent planning calculation based on the entered values and stated assumptions. Verify inputs and obtain professional or supplier confirmation where the decision is consequential.
Does it use U.S. defaults?
Yes. U.S. units, terminology, pricing conventions and rules are the primary defaults where location matters.
Is data sent to a server?
No. The calculation runs locally in the browser and does not send entered values to a remote calculation service.