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Old 04-19-2013, 12:26 AM   #1
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Join Date: Mar 2013
Location: San Francisco, CA
Posts: 25
battery charging without shore power?

Hi everyone,

My wife and I are new owners of an A122S which has two 6-volt, 232 amp-hour batteries. I just checked the battery voltage and found the charge is about 70% (12.3 volts). We keep the trailer at a RV storage place which has no access to shore power and I don't know the most practical way to recharge the batteries without it. We'll be dry camping in a few weeks and I doubt whether driving for 5 hours will bring the battery up to 12.6 volts since it's down about 80 amp-hours. It's seems like the best solution is to buy a 2000 watt Yamaha or Honda inverter-generator and use it to directly charge the batteries with a three-stage battery charger where the bulk charging amperage is around 20 amps. I've read "Managing 12 Volts" and "The 12 Volt Side of Life" but I still don't know the most practical way to charge our batteries without access to shore power.

I would really appreciate any advice or recommendations you can give. Thanks!

Laurel & Lynn (amateur radio W6JAE)
Felix & Cleo (retired greyhounds)
2006 Toyota RAV4
2013 Rockwood A122S
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Old 04-19-2013, 01:13 AM   #2
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Join Date: Jan 2007
Location: Camano Island, Washington
Posts: 14,415
the first thing you should have done before storing it, was to install a battery disconnect switch.
i have one and i simply disconnect the battery and it stays charged, unplugged, for months.

your trailer's converter will recharge the battery just as well as most standalone battery chargers. you would have to drive for hours to get your tow vehicle to recharge a drained battery. more than only 5 hours.

if you don't have solar or shore power, the only way to recharge a depleted battery, is to have a generator. you just plug the shore cord into the generator and let it recharge the battery.

we dry camp almost all the time. i have two deep cycle batteries and a Honda 2000 and we can go 4-5 days without a recharge. even with the more power hungry HTT that we have.

Dan-Retired Firefighter/EMT
Shawn-Musician/Entrepreneur/Wine Expert
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 4x4 3.5 Ecoboost w/Max Tow Package
Equalizer WDH and Prodigy BC
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Old 04-19-2013, 04:46 AM   #3
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Join Date: Jul 2008
Location: central PA
Posts: 973
x2. good recommendations. If you plan on storing it for a long time, think about a solar maintainer (25-30 watt minimum) AND the disconnect switch. It won't charge the battery but will keep it from draining internally while in storage. BTW, 25-30 watt minimum was recommended due to the AHr of your batteries. Please note..will not charge your battery, only maintain with a cutoff switch.
2000 Cherokee 29BH with 6V batteries, LED lights & 400 watts of solar power, flipped axles and raised. 2007 Tundra 5.7L DC-LB with lots of mods. C-co, 8/158th AVN Maint.
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