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MPPT = Maximum-Power-Point-Tracking Charging Method (up to 98% efficiency)

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 MPPT controller the absolute max allowed voltage is defined in the datasheet.
In case of MPPT controllers do not exceed the allowed generator power in accordance to the system voltage. Eg for the CIS-MPPT If 250W for 12V system (=20A) allowed, do not connect 500W to an 12V system, which may result in occuring of 40A and destruction of the controller. This is specific case for MPPT controller with 98% charging efficiency.
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

MPPT

Phocos ECO-N-MPPT 85/15

12/24V PV solar/battery systems
Charge current: 15A
Max input voltage: 85Voc
Max input power: 250/500W
Low voltage disconnect: yes
Grounding: common negative
Charging method: MPPT

Availability: require pre order (waiting time ~4-6 weeks)

Limitations: max 3 units per order

Price: € 115.00

Net Price (without VAT)

pcs.

Phocos CIS-N-MPPT-LED

12/24V PV solar/battery systems
Charge current: 15A
Max input voltage: 85Voc
Max input power: 250/500W
Low voltage disconnect: yes
Grounding: positive
Charging method: MPPT

Availability: require pre order (waiting time ~4-6 weeks)

Limitations: max 3 units per order

Price: € 185.00

Net Price (without VAT)

pcs.

Phocos CIS-N-MPPT-85/15

System Voltage: 12/24V
Charge current: 15A
Max. Input Voltage: 85Voc
Max. Input Power: 250/500W
Low voltage disconnect: yes
Grounding: common negative
Charging method: MPPT

Availability: require pre order (waiting time ~4-6 weeks)

Limitations: max 3 units per order

Price: € 134.00

Net Price (without VAT)

pcs.

Phocos CIS-N-MPPT 100/30

System Voltage: 12/24V
Charge current: 30A
Max. Input Voltage: 95Voc
Max. Input Power: 450/900W
Low voltage disconnect: yes
Grounding: common negative
Charging method: MPPT

Availability: require pre order (waiting time ~4-6 weeks)

Limitations: max 3 units per order

Price: € 260.00

Net Price (without VAT)

pcs.