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Old 05-01-2013, 12:26 AM   #1
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Location: Franktown, CO
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Dometic on starter?

Ok, so if I plug my CF-80 which draws a max of 2.9 amps/hr into my Tacoma starter battery which has 130 amp reserve, does that mean I can run the Dometic for 44 hours and still start the Tacoma?

The battery is a 27f 625 CCA 130 RC

and then
everything changed
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Old 05-01-2013, 03:03 PM   #2
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Re: Dometic on starter?

I believe the 130 reserve is reserve capacity not amp hours.

RC is the number of minutes a new, fully charged battery at 80 F will sustain a discharge load of 25 amps to a cut-off voltage of 10.5. An easier way to determine the capacity is to convert RC to Ah. 130/60 *25 = 54.2 amp hours of capacity. Rule of thumb is you should never drain your battery more than 50% of the Ah rating so you can safely consume 27.1Ah and still be able to start your car.

Worst case scenario if your fridge ran constantly (really hot weather) it would give you 9.3 hours between charges. Of course the fridge will cycle on and off so you could go much longer between charges depending on the weather condidtions.

Here's a useful battery sizing calculator that I've used in the past.
2006 E350 6.0PSD 5R110, SMB 4X4, RB-50, ARB lockers front/rear, Aluminess galore, AMP steps.
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