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Old 11-17-2018, 06:28 PM   #1
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How much charge does TV provide to trailer batteries

DW and I just traveled several days on a multi-leg trip from New England to Texas via North Carolina and Tennessee. We spent 3 nights on the road on a couple of the legs staying in Walmart parking lots. The nighttime temperatures ranged from Low 40s to mid 20s so the furnace rain quite a lot most nights. We have a residential refer so that was a big draw on the batteries as well. We drove anywhere from 9 to 11 hours per day. After two nights the batteries were low enough to shut down the converter to the fridge. Should I expect the TV charging system to keep up with demand
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Old 11-17-2018, 06:32 PM   #2
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No, you should not. The tow vehicle generally only supplies a very small charge and you will need much more with the residential fridge.
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Old 11-17-2018, 06:53 PM   #3
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The "Charging Line" at your tow vehicle is usually going to have a 15 or 20 amp circuit breaker or fuse. In most circumstances, you will have 1/3 to 1/2 of that amount being delivered to the charge wire.

You can have a heavy duty line installed on both the TV and the trailer if you want extra capacity.
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Old 11-17-2018, 07:09 PM   #4
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Originally Posted by Bluepill View Post
The "Charging Line" at your tow vehicle is usually going to have a 15 or 20 amp circuit breaker or fuse. In most circumstances, you will have 1/3 to 1/2 of that amount being delivered to the charge wire.

You can have a heavy duty line installed on both the TV and the trailer if you want extra capacity.


might check the capacity of your alternator first, to see if it can provide the increased amperage.
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Old 11-17-2018, 07:55 PM   #5
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My buddy had a truck that had dual alternators and the second one was dedicated to charging the trailers batteries. My truck is set up to have dual but they are not installed but I might In the future have one installed. My dad years ago installed a larger 180amp alternator and heaver wiring to the trailer connector to charge his batteries and that worked pretty good for him.
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Old 11-17-2018, 08:04 PM   #6
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The real issue is the voltage drop you get from the TV battery to the Bargman connector then thru the connector, then to the battery. You can improve this by upgrading the wiring in the TV, But with a residential fridge and any heat you will never recover from a night unhooked.
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Old 11-17-2018, 08:40 PM   #7
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Perhaps turn off the fridge when traveling - most say it will stay cold if not opened for about 6-8 hours.
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Old 11-17-2018, 09:45 PM   #8
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You need a generator to charge your batteries and run your furnace at night. I have four Trojans six volt batteries hooked up to my residential refrigerator but the furnace is a amp hog. I would stay at campgrounds at night to charge up my batteries
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Old 11-18-2018, 11:33 AM   #9
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Thank you all for your replies and suggestions. Curiosity more than anything else made me ask the question. I do have a couple of Honda generators but would not want to use them in a parking lot. I also have a 90 watt solar panel but I really don't want to mount that on the roof. My TV has two batteries so I was trying to think of a way to easily connect them into the system without doing a whole lot of complicated wiring. I think the best solution for us is to stay at a campground every other night to charge the batteries.
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Old 11-18-2018, 11:57 AM   #10
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Good choice, although running a quiet generator for an hour or two to top off the batteries shouldn't hurt anything.
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