Sine Wave Battery Back Up
For Microprocessor Driven Alternative Heating Appliances

1000 Watt Capacity

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

The Surefire Stove Sentry interfaces between a pellet stove or kerosene heater and the AC electrical supply.

When electricity is present the Surefire Stove Sentry charges a battery and surveys the power line. At the instant that a power failure occurs, the Surefire Stove Sentry converts the energy stored in the battery to AC power. This assures operation of the pellet stove or kerosene heater without interruption during the absence of electricity.

When AC utility power is restored, the Surefire Stove Sentry reinstates AC utility power as the prime energy source to operate the pellet stove or kerosene heater. Simultaneously and automatically the Surefire Stove Sentry commences the recharging of the battery, to return it to full capacity in preparation for the next power failure.

At sites where utility power is not present, the user should determine if there is a sufficient reserve of battery capacity to enable the pellet stove or kerosene heater to operate for the desired time period. Consult the Surefire Stove Sentry operating manual for data relating the size and number of batteries needed.

Figure 1 illustrates the interconnections between the pellet stove or kerosene heater, Surefire Stove Sentry and battery.