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Old 08-03-2021, 12:35 PM   #1
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2021 25' Flying Cloud
Poulsbo , Washington
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Run inverter while towing - does battery charge?

Hi all,

We have a 2021 FC 25 with stock everything (flooded lead acid batteries). I have a Truma portable fridge that pulls 5A @ 120VAC that I was considering leaving plugged in to the camper while towing. Seems like this would be within the capacity of our 1000W inverter.

My question is: will the batteries continue to "pass through" charge from the 12V pin on the tow vehicle while the inverter is on? Any safety issues with towing using the inverter (I can't think of any since it just energizes a few plugs + the A/V system)?

Thanks!
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Old 08-03-2021, 12:56 PM   #2
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Well, your load is 600 watts so,we’ll within the capability of your inverter. But, you’ll be pulling north of 50 amps from your 12VDC system to do it. The umbilical will provide some small portion of that, but not much.

So, depends on how far (how long) you need to power it and what the capacity of your battery bank is.
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Old 08-03-2021, 01:17 PM   #3
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I think you may have confused the DC amp draw with the AC amp draw. Truma rates them for 5-6 amps at 12v, 0.6-0.74 amps at 120v AC.

So, you could just wire up a 12v connection for it somewhere (if you don't have one handy) or you could run it off the inverter as planned. It's less efficient off the inverter (because you have the inverter's inherent inefficiency, and probably some conversion inefficiency within the Truma) but at 1/10th the draw you were thinking, it probably won't be a deal-breaker.
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Old 08-10-2021, 08:06 PM   #4
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2021 25' Flying Cloud
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Thanks, DKB_SATX - that was a good catch. I had been doing some calculations for using the fridge on a 12v line from an external battery bank and forgot to flip back to the amps for 120v.

We went on a trip last weekend with the inverter on while towing and the Truma plugged in to AC and everything worked out well!
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