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What's the difference?


The two types of charge controllers most commonly used in today’s solar power systems are pulse width modulation (PWM) and maximum power point tracking (MPPT). Both adjust charging rates depending on the battery's charge level to allow charging closer to the battery’s maximum capacity as well as monitor battery temperature to prevent overheating.

Array Voltage

PV array & battery voltages should match.

PV array voltage can be higher than battery voltage.

Battery Voltage

Operates at battery voltage so it performs well in warm temperatures and when the battery is almost full.

Operates above battery voltage so it is can provide “boost” in cold temperatures and when the battery is low.

System Size

Typically recommended for use in smaller systems where MPPT benefits are minimal.

≈ 150W – 200W or higher to take advantage of MPPT benefits.

Array Sizing Method

PV array sized in Amps (based on current produced when PV array is operating at battery voltage).

PV array sized in Watts (based on the Controller Max. Charging Current x Battery Voltage).

MPPT vs PWM solar charge controller

MPPT vs PMW: comparación de controladores de carga y guía del comprador

Un sistema de energía solar generalmente incluye un panel solar o matriz que genera electricidad, un banco de baterías que almacena la electricidad para su uso posterior y un inversor que convierte...