Browse the 20 amp solar charge controllers below to find the one that best meets your needs for your application. The SunSaver and SunLight controllers are Professional Series controllers that are offered globally. They use PWM charging technology so they should be matched with PV arrays that do not exceed the controller’s current rating. The EcoBoost MPPT is an Essential Series controller is offered outside the US and Canada. It comes in metered and non-metered versions. Since the EcoBoost uses maximum powerpoint tracking charging technology, it can be installed with oversized solar arrays that exceed its charge rating, but its Voc rating must not be exceeded.