Need an installer? First we assess the system together. Then ask about a technician in your area. Contact Carmine

CEG calculator

PV string voltage and cold Voc calculator CEG

Check total open-circuit voltage of series-connected panels with an estimated 15% margin against maximum inverter PV input voltage. Not an electrical design.

Open-circuit voltage of panels in series

Enter numbers without thousands separators: 3000. Field examples are not measurements of your home.

Nominal Voc = one module’s Voc × modules in series. This first check applies a fixed 15% increase. Example: eight 49.5 V modules give 396 V, or 455.4 V with that margin. It does not automatically identify a safe panel count: manufacturer data, minimum temperature and MPPT/current checks are required.

Method and limitations

Nominal Voc = one module’s Voc × modules in series. This first check applies a fixed 15% increase. Example: eight 49.5 V modules give 396 V, or 455.4 V with that margin. It does not automatically identify a safe panel count: manufacturer data, minimum temperature and MPPT/current checks are required.

All calculators · The same check in the full guide (Italian)