Morningstar String Calculator

Instructions

This String Calculator will help you decide how many PV modules you may use in series and parallel with a Morningstar charge controller.

1. Select the PV module you will be using
2. Select the Morningstar controller you will be using
3. Result is the quantity of PV modules that may be used in series and parallel to safely operate within the charge controller ratings.

Disclaimer: Morningstar makes no representation, warranty or assumption of liability regarding the use of the String Calculator. This tool uses data provided by other parties (such as PV module specs) and makes calculations based on assumptions which may or may not prove to be valid.

Module & System Info

Module Info
Select a Manufacturer & Model
Manually Input Module Specifications
Manufacturer   Model
 
Morningstar Product 
 
System Info
Minimum Battery Voltage V

Minimum Battery Voltage


This is a required value

Specify the lowest voltage expected for the system battery. This value
may be determined by the LVD setpoint of the charge controller or the
cut-off voltage of the system load(s).

Suggested values:
Nominal VoltageMinimum Voltage
12 Volt11.5 V
24 Volt23.0 V
48 Volt46.0 V

Record Low Temperature

Record Low Temperature


This is a required value

Specify the coldest ambient temperature
on record where the sytem is located

Maximum Battery Voltage V

Maximum Battery Voltage(volts)


This is a required value.

Specify the highest expected battery voltage
This value is determined by the equalization
voltage setpoint, compensated for temperature.
If unsure, use the suggested values below:
Nominal VoltageMaximum Voltage
12 Volt15.5 V
24 Volt31.0 V
48 Volt62.0 V

Average High Temperature

Average High Temperature


This is a required value

Specify the average annual high temperature
for the system location