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Old 08-23-2015, 11:39 AM   #1
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12v-6v VIP Gen ?

It's time to replace the house batteries. I'm planning to change from 3-12v to 4-6v GC batteries for the additional amp hours. Since we installed a HH refrig we need the extra overnight run time the 6v's should supply.
My question is; since the generator is started off the house batteries will the 6v deep cycle batteries supply the start power, and if so, will it shorten the life span? Would I be better off installing 3 12v Marine Batteries instead of the true 6v deep cycle batteries? OR, possibly change the generator to start off of the engine batteries?
I couldn't find a thread addressing this so any asap help would be appreciated.
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Old 08-23-2015, 12:04 PM   #2
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A pair of 6v batteries have more than enough amps to provide genset starting power. Just make sure the genset cables are wired to a series pair, for 12v rather than 6v.

12v vs 6v is mostly a cost decision. You can get excellent 12v deep cycles, e.g. Trojan or US Battery brands, but they are pricey. A 12v marine battery is much less expensive but also has a much shorter useful lie (About three years).

Total Amp Hours depend on the size chosen, not 12v vs 6v. A pair of Group 27 or 29 12v's will produce the same 220-230 AH as a pair of 6v GC2 "golf cart" batteries.

So, buy the size (amp hours) you need and the quality (life time) that suits your budget. I've written an article on How to Choose a Battery for Your RV - it is available at Choosing An RV battery

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Old 08-23-2015, 12:52 PM   #3
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Thanks, Gary

Thanks for the quick reply. Since I posted I have surfed and found a few others who say the 6v should crank the gen and not be harmed. I'll pull the trigger and change out the batteries tomorrow. I'm not a member of Sam's or Costco so I can't take advantage of those prices but I found, believe it or not, that Batteries Plus was the best price and the most informative. None have but a 12 month warranty. Found any different?
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Old 08-23-2015, 01:02 PM   #4
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Lifeline AGMs might have a 5 year warranty when used in an RV, although that might vary with the different models too.
According to the specs our MH was supposed to have 2 8D AGM 12V batteries for starting but came with 4 925 CCA 12 V no maintenance instead. My gen starts off the house batteries too, but they need replacing.
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