Formula variables
- Modules in series is the count in one PV string.
- Module Voc is the open-circuit voltage at reference test conditions.
- Temperature coefficient is entered in percent per C.
- Maximum DC voltage is the equipment or design value being screened.
Assumptions
- Module Voc and temperature coefficient are entered from manufacturer data.
- Cold voltage uses the entered lowest cell temperature and reference temperature.
- The maximum DC voltage is entered by the user for the equipment being reviewed.
- This calculator does not design a PV array, approve equipment ratings, or replace manufacturer instructions.
Examples
Cold Canadian morning. Ten modules at 49.5 V Voc with a -0.28 percent/C coefficient and -25 C low cell temperature estimate about 564.3 V.
Equipment workflow. Use module data, inverter limits, and project temperature assumptions before final string count decisions.