Buy MorningStar Tristar Three-function PWM controller For Sailing Boats & Yachts, with Free Delivery to the UK.  For use with solar electrical systems and as a diverter for excess energy to a dump source. 

These powerful tropicalised three-function PWM controllers provide reliable solar battery charging, load control or diversion regulation to divert excess power to a dump load for use in solar, wind or hydroelectric systems. 

(Two or more controllers may be used to provide multiple functions).  

Large heat sink enables operation at up to 45°C without de-rating. 

3 LED's indicate battery status, alarms and faults.  

Optional LCD digital backlit display (included with -M version) provides system & controller information: battery voltage; current; temperature; amp-hours and error mode. 

Versions mount either on face of the controller or remotely. 

For use in either 12, 24 or 48V systems. 

Fully adjustable with DIP switches. 

RS232 communication for custom settings, data logging, remote monitoring/control.  

Reverse polarity, short circuit, over-current, high temperature and over-voltage protection. 

Operation from - 40 to+ 45°C. 

Terminals take up to 35sqmm cables.