Morningstar SunSaver Duo Dual Battery Charge Controller, 25A

The Morningstar SunSaver Duo SSD-25 is an advanced PWM (pulse width modulation) two-battery controller for RV’s, caravans, boats and cottages. It will charge two separate and isolated batteries at the same time and features Morningstar’s legendary SunSaver controller technology.


Morningstar’s SSD-25 solar controller is recognized for its high reliability and improved battery charging. It is epoxy encapsulated for environmental protection, is user-adjustable via DIP switch or connection to a personal computer and has an optional temperature sensor (TS-RTS).

Features of the Morningstar SunSaver Duo SSD-25 include:

  • Two-Battery Charging: based on a user-selectable priority.
  • Lower Cost: no need for separate solar charging systems and isolation between batteries.
  • Easy to Install: installed near batteries using clearly labeled large wire terminals.
  • Longer Battery Life: four stage series PWM pulse charging and temperature compensation increases useful life.
  • Standard 5 year warranty and estimated 15 year life.