Morningstar’s SunSaver Duo™ is
an advanced PWM two battery controller for RV’s, caravans, boats and
cottages. Rated for 25 amps at 12 volts DC, this product will charge
two separate and isolated batteries at the same time, such as a "house"
and an engine battery, based on user selectable priorities. This
controller also includes a backlit remote meter which may be mounted in
or on a wall, and displays digital and pictorial status information
about the solar power system.