EMERGENCY                  BATTERY BACKUPS       

MODEL SF 503B/709

Pure Sine Wave Battery Back Up 
For Microprocessor Driven Alternative Heating Appliances

800-1000 Watt Capacity



SF 503B AND 709 interfaces between a heating appliance (wood pellet or alternative fuel stove) and its AC wall outlet. When AC utility power is present, the backup charges the battery and monitors the wall outlet to detect a power outage. At the moment utility power fails, these backup units draws energy from a battery and converts it to enable appliance operation. When utility power returns, the backup automatically switches the appliance back to AC wall outlet power. At the same time, the backup resumes charging the battery to return it to full capacity in preparation for the next power failure.

Model 503B          800 watt   

Model 709 1000 watt

                 WELL PUMP                         BATTERY BACKUP MODEL 952

3 kW Capacity


Model 952 Well Pump Sentry maintains well pump operation during power outages. Model 952 is a self-contained emergency backup system designed to drive single phase 220 VAC to 240 VAC well pumps rated up to one horsepower.

The 952 system is comprised of an inverter, power transfer switch, and a 3 stage automatic battery charger. Power input connections to the 952 Well Pump Sentry consist of an AC voltage input from the utility and a DC voltage input from a battery bank. The 952 Well Pump Sentry may be mounted horizontally or vertically and will energize pump motors having configurations of two or three wires.


  • Operates 230 VAC; 50/60Hz Well Pumps

  • Instant Automatic Power Transfer

  • Supports Full Pump Capacity

  • Easily Installs Next to Electrical Panel

  • Silent and Clean Operation



  • Well Pumps up to

  • 1 HP capacity

  • Sine Wave Output

  • Compatible with 24V Battery Bank