A charge controller regulates the energy from the solar photovoltaic array (or in some instances a wind turbine) to the battery bank. This prevents overcharging, and thus limits loss of electrolyte, ensuing gassing and plate damage within the batteries.
Non-MPPT charge controllers use Pulse Width Modulation (PWM) technology and the Morningstar charge controller were amongst the first to adopt this method. It works by tapering off the current from the PV array depending on the condition and recharging needs of the batteries. The advantages are longer battery life and better use of solar arrays energy.
Morningstar charge controllers have a high efficiency and low self-consumption with protection from over voltage, reverse polarity, lightning and short circuit and a working temperature range -40° to 85° and temperature compensation.