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Editable example valuesYour estimate
Live calculationNo location or tariff is detected automatically. All results use the values you enter.
What is this tool used for?
Use this calculator to understand how arranging identical solar panels in series and parallel changes the array's voltage, current and rated power.
How to use this calculator
Enter panels per series string, the number of parallel strings, and each panel's Vmp, Voc, Imp and Isc from its datasheet. Keep modules and string lengths consistent with the model's assumptions.
Understanding your results
Series panels add voltage; parallel strings add current. The calculated Voc is at the entered reference condition, so it still needs a cold-temperature check. Use inverter string compatibility next to screen the array against a particular MPPT input.
How this is calculated
Before you use the result
Assumes identical modules with equal-length strings under matching conditions. Voc here is at the entered reference condition, not corrected for cold weather. Use the string compatibility tool before choosing inverter inputs. This does not size fuses or connectors.
What should I check before using this estimate?
Assumes identical modules with equal-length strings under matching conditions. Voc here is at the entered reference condition, not corrected for cold weather. Use the string compatibility tool before choosing inverter inputs. This does not size fuses or connectors.