Product details:

Morningstars SunSaver Duo is an advanced PWM two battery controller for RVs, 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.