MPPT SOLAR CHARGE CONTROLLER CALCULATOR

1. SINGLE PANEL SPECIFICATIONS:

(CHECK DATASHEET OR MANUFACTURER’S WEBSITE)

Solar Panel Top View
MAXIMUM POWER (Pmax): W
OPEN CIRCUIT VOLTAGE (Voc): V
SHORT CIRCUIT CURRENT (Isc): A

2. SOLAR ARRAY:

SERIES:
PARALLEL:
BATTERY BANK VOLTAGE: 12V
24V
1S 1P- Solar Panel Array Series Parallel
2S 1P- Solar Panel Array Series Parallel
3S 1P- Solar Panel Array Series Parallel
4S 1P- Solar Panel Array Series Parallel
5S 1P- Solar Panel Array Series Parallel
6S 1P- Solar Panel Array Series Parallel
1S 1P- Solar Panel Array Series Parallel
2S 2P- Solar Panel Array Series Parallel
3S 3P- Solar Panel Array Series Parallel
4S 4P- Solar Panel Array Series Parallel
5S 5P- Solar Panel Array Series Parallel
6S 6P- Solar Panel Array Series Parallel
1S 3P- Solar Panel Array Series Parallel
2S 3P- Solar Panel Array Series Parallel
3S 3P- Solar Panel Array Series Parallel
4S 3P- Solar Panel Array Series Parallel
5S 3P- Solar Panel Array Series Parallel
6S 3P- Solar Panel Array Series Parallel
1S 4P- Solar Panel Array Series Parallel
2S 4P- Solar Panel Array Series Parallel
3S 4P- Solar Panel Array Series Parallel
4S 4P- Solar Panel Array Series Parallel
5S 4P- Solar Panel Array Series Parallel
6S 4P- Solar Panel Array Series Parallel

TOTAL POWER:
0 W

OPEN CIRCUIT VOLTAGE:
0 V

MAX CHARGE CURRENT:
0 A

3. RECOMMENDED MPPT SOLAR CHARGE CONTROLLER:

* This calculator assumes a temperature correction factor of 1.2.


How this calculator works


1. The calculator first computes the Total Power, Open Circuit Voltage, Max Charge Current and Short Circuit Current of the solar array:

TOTAL POWER:

PMAX x Number of Panels

OPEN CIRCUIT VOLTAGE:

VOC x Number of Panels in Series x T°FACTOR

MAX CHARGE CURRENT:

TOTAL POWER ÷ Battery Charge Voltage

SHORT CIRCUIT CURRENT:

ISC x Number of Panels in Parallel

Where:

  • PMAX, VOC, ISC: User inputs
  • Number of Panels: Total number of panels
  • Battery Charge Voltage: 14.7V for 12V battery bank, 29.4V for 24V battery bank
  • FACTOR: Temperature correction factor for -13F (-25C) per NPFA70® NEC® Table 690.7(A):
NPFA70 NEC Table 690-7(A) - Voltage Correction Factors for Solar Panel Array

2. The calculator filters MPPT solar charge controllers compatible with your Battery Bank Voltage (12V or 24V).

3. The calculator selects a MPPT solar charge controller rated for both the array's OPEN CIRCUIT VOLTAGE and MAX CHARGE CURRENT.*

* Any solar charge controller rated higher than OPEN CIRCUIT VOLTAGE and MAX CHARGE CURRENT would be acceptable, but the calculator displays the closest match.

4. At last, the calculator makes sure that the solar charge controller is rated for the array's Short Circuit Current (Per Victron's Datasheets).


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3 thoughts on “MPPT Solar Charge Controller Calculator”

  1. Hi Guys,

    Question, with connecting three panels in parallel, the try connection on the roof for connecting the three panels together, do they all need to be connected for the panels to charge/work? meaning, if I have only two panels connected and one stored away, will the two connected still charge my batteries, with one not connected? I just don’t have the Real Estate to mount all three on the roof, I’ll connected the third when camping. So will the other to work? with one panel not connected?? Been looking everywhere for this info…Can you help. Cheers

    Reply

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