Lower price! NEW item - bought at web site below; never used. Morningstar's SunSaver MPPT™ solar controller with TrakStar™ Technology is an advanced maximum power point tracking (MPPT) battery charger for off-grid PV systems on boats and RVs. Includes load control Maximizes energy harvest Provides power boost Allows the use of high voltage modules Fully adjustable and programmable Extensive electronic protections Provides longer battery life