During recent years kerosene heater manufacturers have added major operating refinements to their product designs. Consequently the electrical control systems in kerosene heaters have become more complicated. Latest models now require power sources that replicate the power waves generated by utility lines. The technical term for this type of power is "sine wave".
The Surefire Heater Sentry power back up unit supplies pure sine wave power. When used with one or several batteries it will prolong the operation of a kerosene heater in the absence of electricity. Back up time depends on the number of batteries available and the electrical power level at which the heater operates. This power level is dictated by the heater thermostat or room temperature control settings. As a guideline each 100 A-hr battery will allow 4 to 6 hours of operation for a kerosene heater that consumes an average of 400 Watts. Units consuming less power will go for proportionately longer periods of time.
Here is how it works ...
Surefire Heater Sentry interfaces between a kerosene heater and the 120 Volt AC electrical line.
When electricity is present Surefire Heater Sentry charges one or several batteries and monitors the power line. At the instant of power failure, Surefire Heater Sentry begins to convert the energy stored in the battery to sine wave AC power. This assures the uninterrupted operation of the kerosene heater at the start of a power outage.
When AC utility power is restored Surefire Heater Sentry reinstates AC utility power as the prime energy source to operate the heater. Simultaneously and automatically the Surefire Heater Sentry commences the recharging of the battery to speedily 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 the battery capacity to enable the kerosene heater to operate for the desired time period. Consult the Surefire Heater Sentry operating manual for data relating the size and number of batteries needed.
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