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Old 03-06-2024, 02:28 PM   #1
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Join Date: May 2023
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Running Residential Fridge via inverter on long drive days

I've owned my 2021 Berkshire 34B for a year now but haven't taken a trip longer than 4 hours drive.
We have 2 big trips planned this year (Austin 1300 mi & Grand Canyon 2000 mi) and I'm curious how much my residential fridge will deplete my house batteries? Each drive day will be long (500-700 mi).
Does my coach have a BIM and will it sufficiently charge the house batteries or should I consider a DC to DC charger?
Does anyone have insight or guidance that would help?


My coach has a 160 alternator, four - 6V flooded lead acid batteries (400Ah total) and one - 100 watt solar panel.
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Old 03-06-2024, 08:34 PM   #2
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No worries

100%. Your coach will keep the house batteries fully charged while the refrigerator or any other devices off the inverter are running "while driving".
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Old 03-06-2024, 08:49 PM   #3
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Old 03-07-2024, 03:56 PM   #4
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Originally Posted by PeteMcCarthy View Post
Hey Pete,

Do you know how to program your AGS feature? I always recommend this as a great option for people for when they go on a trip, let the coach power needs manage itself. Just an idea for peace of mind.

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Old 03-07-2024, 05:59 PM   #5
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Start and run your main engine for 10 to 15 minutes and then look at your house battery voltage. It should be above 13 volts, without shore power plugged in.

If it is, you'll be fine. If not, your system is not functioning properly.
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Old 03-29-2024, 02:31 PM   #6
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Your alternator should charge your chassis batteries and once fully charged it will charge your house batteries. I have never ever had an issue with supplying power to my residential fridge while driving 700-800 mile days
Alex and Valerie
2014 Berkshire 400BH
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Old 03-30-2024, 05:48 PM   #7
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with 400 amp-hrs you will be just fine. just make sure they get fully recharged each evening.

we have a residential refrigerator in a 5th wheel. we watch what we put into on our first day of a trip. only things that are precooled. we turn the ice maker off. it takes about 3 hours of the refrigerator running continuously at the start of the trip to get it down to normal operating temperatures. after that, we just use it normally. we only have 200 amp-hours of battery and they have always had power at the end of out longest tow day (10 hrs).
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Old 03-30-2024, 08:54 PM   #8
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Once the fridge has been on and up to temp with stuff inside it will not run much, and when it does it doesn’t pull a lot of amps. You’ll be fine with the charge from the engine alternator.
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fridge, inverter

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