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Open Roads Forum  >  Public Lands, Boondocking and Dry Camping

 > Battery questions for boondocking

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time2roll

Southern California

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Posted: 12/22/20 08:42am Link  |  Quote  |  Print  |  Notify Moderator

kfp673 wrote:

Thanks again all. Quick question on charging 6V batteries. If I go with 2 and wire them in series, does the charger built into the trailer still charge both as it would a 12V battery when plugged into shore power? Also, when using a standard charger (not the built in camper charger) how do you properly charge them together? Do you put your charger clamps on the same terminal as the RV would, 1 batteries + and the other batteries - with the jumper from + to - still attached? Thanks!
Once you connect them in series you have one twelve volt battery. Do not connect anything to the battery to battery jumper and all works fine.


2001 F150 SuperCrew
2006 Keystone Springdale 249FWBHLS
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SJ-Chris

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Posted: 12/22/20 02:28pm Link  |  Quote  |  Print  |  Notify Moderator

Two 12v Deepcycle lead acid batteries (~$100x2) plus 200w of solar (Amazon: ~$280) and you will probably be able to boondock comfortably 95% of the time with nothing else. If you are running the furnace at night, it will suck a lot of those AmpHours. If the batteries get low, you've got the generator (or alternator) to charge them back up again along with the solar. If over several trips you notice the solar not keeping up, add another 100w panel (simple at that point) for another $100 to give you 50% more solar charging power.

Good luck!
Chris


San Jose, CA
Own two 2015 Thor Majestic 28a Class C RVs

ppine

Northern Nevada

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Posted: 12/22/20 03:20pm Link  |  Quote  |  Print  |  Notify Moderator

Running the furnace for more than a few minutes in the morning or evening uses a lot of power. This time of year 200 watts is not going to keep up.

pnichols

The Other California

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Posted: 12/23/20 08:47pm Link  |  Quote  |  Print  |  Notify Moderator

FWIW, I consider our 25K BTU motorhome furnace typical. As such, it draws around 6 to 7 amps per hour when it's running. However, it of course doesn't run full time at all.

If it runs about 1/3 of the time, it only depletes amp hours out of the coach batteries at a rate of one third of 6 to 7 amps per hour. That would amount to only 2 to 2 1/3 amps per hour of battery amp hours depletion.

Most dual battery RV setups in good condition, and kept fairly well charged every 2-3 days, should do quite well keeping the coach warm in anything but extreme low temps if ... the RV isn't a large one and if you block off sections not occupied during nights.

Our motorhome is small, and it's furnace keeps us comfortable with 230 AH of battery capacity that powers everything else, including two CPAP machines every night.


Phil, 2005 E450 Itasca Spirit 24V

Boon Docker

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Posted: 12/23/20 11:13pm Link  |  Quote  |  Print  |  Notify Moderator

We boondock in the mountains (very cold at night and in morning) and use the furnace in the evening for a couple hours and in the morning for an hour. Our 200 watts of solar does just fine with our 24 foot trailer.

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