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Old 07-23-2015, 08:10 PM   #1
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Solar panel & battery

Do the batteries hold enough charge to run the a/c? How long, if at all? We'd like to go off the grid.

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Old 07-23-2015, 08:18 PM   #2
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I wish, but no such luck. I think even a 2000 watt generator is marginal. Loren

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Old 07-23-2015, 08:32 PM   #3
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Going off the grid means no electric, which means no a/c. But you will still have the MaxxFan which does a good job with cooling.
never in doubt, often wrong
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Old 07-23-2015, 09:01 PM   #4
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Originally Posted by cpaharley2008 View Post
But you will still have the MaxxFan which does a good job with cooling.
Except in the southwestern US
Mary F Onward, through the fog!
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Old 07-23-2015, 09:06 PM   #5
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The largest battery setup offered by Escape - the two 6-volts combination - is rated at 232 amp-hours... if discharged completely over 20 hours. You get less out if you use it at a higher rate (which would be needed), and it is generally recommended that you discharge this type of battery to no more than 50% of capacity, so the end result is that you could use less than 100 amp-hours.

If the air conditioner needs 9 amps at 120 volts, the inverter running the air conditioner would need more than 90 amps at 12 volts, so the battery set would run the air conditioner for about an hour.

There are long-haul truck drivers who run air conditioning for their cabs and sleepers from batteries, but they have a much larger (and heavier) set of batteries, are cooling a smaller space, and get back on the road with high-output alternator for recharging after a minimum length of stop.

An Australian travel trailer manufacturer offers battery power for air conditioning, but they use a very expensive lithium battery bank.
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Old 07-24-2015, 06:29 AM   #6
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As others have implied, the only boondocking option for powering the AC is a generator. Lauren and Kathy have suggested that a 2000w generator is marginal. Here is a thread supporting that contention. Which generator needed to run a/c Marginal means that sometimes it works and sometimes it dosen't. The safe bet would be a 2400 unit. More power, more weight, more expense, more noise. It's a tradeoff.

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