Calculate array string current and voltage for cable and controller sizing.
Voltage adds along a series string while current adds across parallel strings. Open circuit voltage is the figure that must stay within inverter and isolator ratings, and it rises in cold weather. String voltage in cold conditions can exceed 1,000 V and destroy an inverter, which is why Voc must be checked at the minimum expected temperature.
Solar Array Current
Series panels add voltage; parallel strings add current
Series panels add voltage; parallel strings add current Voltage adds along a series string while current adds across parallel strings. Open circuit voltage is the figure that must stay within inverter and isolator ratings, and it rises in cold weather.
String voltage in cold conditions can exceed 1,000 V and destroy an inverter, which is why Voc must be checked at the minimum expected temperature.
This calculator takes 5 inputs: Panels in series per string, Strings in parallel, Panel voltage at maximum power, Panel current at maximum power, Panel open circuit voltage. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.