Mastervolt SCM25 MPPT Solar Charge Controller

The Mastervolt SCM25 MPPT Solar Charge Controller suits arrays of roughly 200 to 700 watts, with automatic 12V/24V detection and a temperature sensor.

Panel compatibility is broader than most controllers, covering traditional 36 and 72-cell panels as well as common 60-cell types. Sixty-cell panels are the standard residential size and considerably cheaper per watt than marine-specific panels, so a controller that accepts them opens up a much larger supply.

Higher allowable PV voltage lets panels be connected in series, which reduces cable size, wiring length and power loss between the array and the controller. On a boat where the panels sit on an arch and the batteries are amidships, that saving is real.

A battery temperature sensor optimizes charging voltage, which matters because the correct voltage changes with temperature. Pre-programmed profiles cover multiple battery types including Mastervolt lithium, automatic 12V/24V detection simplifies setup, and the display gives clear operating information. Explore more solar charge controllers.

• Takes 36, 72 and common 60-cell panels
• 60-cell residential panels cost far less per watt
• Series wiring cuts cable size and losses
• Temperature sensor corrects charging voltage