Battery Information - Whistler HIGH SURGE POWER INVERTERS Owner's Manual

BATTERY INFORMATION

1. To calculate the amp/hour of the battery, first determine
its "reserve minutes" rating. (Deep cycle marine batteries
generally have the highest reserve minute ratings). This
rating typically is marked on the battery along with the
"Cold Cranking Amps" (CCA) rating. Multiply the reserve
minutes rating of the battery by 0.3 to determine the
battery amp/hour rating. A battery with a reserve minutes
rating of 166 has an amp/hour rating of 49.8 amps.
2. To estimate the maximum battery power the inverter
will require to run a piece of equipment or appliance,
divide its continuous load wattage requirement by 10.
The WHISTLER 1200 watt model utilizes 50 amps of battery
power to operate an appliance with a 500 watt continuous
load requirement. (500 divided by 10 = 50).
3. Conclusion: The reserve power of the battery is sufficient
to satisfy the continuous load demand placed on the
inverter for a maximum of about one hour. (49.8 divided
by 50 = 1 hour).
Note:
• When the inverter will be operating equipment or
appliances with high continuous load ratings for extended
periods, it is not advisable to power the inverter with the
same battery used to power your vehicle. If the car or truck
battery is utilized for an extended period, it is possible that
the battery voltage may be drained to the point where
the battery has insufficient reserve power to start the vehicles.
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