A charge controller is used to keep the voltage across the battery within acceptable limits. The charge controller automatically regulates, stops, or diverts power when batteries become fully charged. Charge controller capacities range from 4 A to 100 A and multiple charge controllers can be used in parallel for larger systems. Some charge controllers offer additional features including charge status display, data logging, automatic equalisation charging, generator starting, and even lighting control.
The simplest charge controllers disconnect the power source (solar) when the battery reaches a set voltage, and turn it on when a low voltage set point is reached.
Pulse Width Modulated (PWM) charge controllers turn on and off very rapidly, maintaining the batteries at full charge voltage, which results in quicker and more complete battery charging.
Maximum Power Point Tracking (MPPT) charge controllers optimize the voltage of the PV array to maximise total power output then convert that to the correct voltage to charge the battery bank. This process significantly increases the power from a solar array, particularly in low temperatures when battery voltage is significantly below the PV array voltage. Most MPPT charge controllers work with higher array voltages, which can greatly reduce the required wire size between the array and the charge controller. Whole more expensive than PWM controllers, MPPT charge controllers can boost system performance by up to 30% making them very cost effective.
MPPT Charge Controllers
The table below shows our selection of MPPT Charge Controllers. Click through on the model number for more in-depth detail.
Please make use of the free on-line String Sizing Apps to calculate solar array sizing.
Max Output Current
60A @ 48VDC
Maximum Recommended PV
Maximum Array Voltage: 600VDC
Input power can exceed Nominal Maximum Operating Power, but controller will limit and provide its rated continuous maximum output current into batteries. This will not harm the controller.
PWM Charge Controllers
The table below shows our selection of PWM Charge Controllers. Click through on the model number for more in-depth detail.
It is important to note that PWM charge controllers have limited voltage correction capabilities and should only be used with 36 or 72 cell modules connected in series or parallel to match the battery voltage.
Dual Battery Charging With Remote MeterRated Solar Input25A @ 12VDCLoad Current10AMaximum Solar Voltage30 VoltsRegulation Voltage: Sealed / Flooded14.1 / 14.4 VoltsFloat Voltage13.7 Volts
Rated Solar Input30A @ 12 / 24 VDCLoad Current30AMaximum Solar Voltage30 / 60 Volts7 Standard Battery Settings + Custom optionLow Voltage Disconnect / Reconnect11.4 / 12.6 Volts or Custom22.8 / 25.2 Volts or Custom
Rated Solar Input15A @ 12 / 24 VDCLoad Current15AMaximum Solar Voltage30 / 60 Volts7 Standard Battery Settings + Custom optionLow Voltage Disconnect / Reconnect11.4 / 12.6 Volts or Custom22.8 / 25.2 Volts or Custom