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Sizing the charge controllers in PV off-grid systems:

• Do not exceed the controller allowed max current and voltage A/V defined as Isc/Voc.
• In PWM controller max allowed voltage results from battery.min.voltage +30V (eg in 12Vdc systems: ~10Vmin.bat + 30V = 40V max).
• In MPPT controller the absolute max allowed voltage is defined in the datasheet.
• The real occuring current and voltage of the panel depends on temperature coefficient of the panel. Calculate additional 25% (A/V) which may occur under low temperature, as safety buffer (eg if panel Isc 8A, calculate +25% = 10A which may occur).
• To choose the correct battery capacity, multiply the controller nominal current x10 (eg for an 10A controller choose 100Ah battery).
• Always check the controller's datasheet and manual for individual parameters.

  Diagrams    Guide PV Off-Grid Systems