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.
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.
BATTERY/CABLE INFORMATION
•It may be advisable to operate the inverter from a bank of batteries of the same type in a "parallel" configuration. Two such batteries will generate twice the amp/hours of a single battery; three batteries will generate three times the amp/hours and so on.
This multiple parallel battery option is especially recommended for the Whistler 3000 inverter due to the high level of amps these models require to produce up to 3000 watts of continuous load. For more information regarding battery power please visit our inverter faq page at
Wire Cable Gauges
For safe and proper operation of the inverter, connect the inverter to the power source with the thickest wire available and in the shortest length practical.
1200
When the inverter and the battery are set up within four feet of each other, use a minimum of #4 gauge wire to make the connections. Within four to six feet, use a minimum of #2 gauge wire. At distances of more than six feet, use #0 gauge wire.
Regardless of the wire gauge selected to make the connections to the battery, we recommend use of an "O Ring
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