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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

CIS (Waterproof IP68 Controllers)

Phocos CIS-N-10 Phocos CIS-N-10
Producer: Phocos

€ 48.00

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Phocos CIS-N-20 Phocos CIS-N-20
Producer: Phocos

€ 69.00

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Phocos CIS-N-LED-1050 Phocos CIS-N-LED-1050
Producer: Phocos

€ 99.00

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Phocos CIS-N-LED-1400 Phocos CIS-N-LED-1400
Producer: Phocos

€ 99.00

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Phocos CIS-N-LED-2800 Phocos CIS-N-LED-2800
Producer: Phocos

€ 99.00

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Phocos CIS-N-MPPT-LED Phocos CIS-N-MPPT-LED
Producer: Phocos

€ 185.00

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Phocos CIS-N-MPPT-85/15 Phocos CIS-N-MPPT-85/15
Producer: Phocos

€ 134.00

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Phocos CIS-N-MPPT 100/30 Phocos CIS-N-MPPT 100/30
Producer: Phocos

€ 260.00

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Phocos CIS10-2L Industrial Solar Charge Controller IP68, dual load, timer (12/24V) Phocos CIS10-2L Industrial Solar Charge Controller IP68, dual load, timer (12/24V)
Producer: Phocos

€ 60.00

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Phocos CIS20-2L Industrial Solar Charge Controller IP68, dual load, timer (12/24V) Phocos CIS20-2L Industrial Solar Charge Controller IP68, dual load, timer (12/24V)
Producer: Phocos

€ 90.00

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Phocos CIS10 Industrial Solar Charge Controller IP68, timer (12/24V) Phocos CIS10 Industrial Solar Charge Controller IP68, timer (12/24V)
Producer: Phocos

€ 54.00

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Phocos CIS20 Industrial Solar Charge Controller IP68, timer (12/24V) Phocos CIS20 Industrial Solar Charge Controller IP68, timer (12/24V)
Producer: Phocos

€ 78.00

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