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 > 6 or 12 That is the question

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valhalla360

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Posted: 08/04/21 10:58am Link  |  Quote  |  Print  |  Notify Moderator

wanderingbob wrote:

I read Valhalla statement about 2 six volts turning a small motor . I am glad that I had not read it years ago when for seven years I had two 6 volt golf car batteries starting a 6-71 Detroit in a dive boat !


If your motor doesn't take a lot of amps to turn and the batteries do it...there is no harm to the batteries.

I was merely referring to a common situation where deep cycle batteries are commonly used to power starter motors.


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Veebyes

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Posted: 08/04/21 01:02pm Link  |  Quote  |  Print  |  Notify Moderator

Generally pack as many amp hours as you have space to put them.

Typically RV builders don't allow much space for the battery bank. Enough room for 2 group 27 12V or 2 group 31s if you are extremely lucky.

A third option is to have a single 4D battery which will give more than 200 amp hours & simplify wiring.

It is not as simple as 6V or 12V.

There is use & battery chemistry to consider. Cheapest is not necessarily the best overall.

You can get AGM batteries. They cost much more than wet cells, have zero maintenance, are good for deeper discharges, many more discharge cycles, self discharge at half the rate of a wet cell in storage and can have a useable lifespan up to 10 years.

The way to go if you want to be prepared for more than a night or two of dry camping.

For the typical weekend warrior always on hookups the wet cell bank in one configuration or another is the way to go.


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dedmiston

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Posted: 08/04/21 02:20pm Link  |  Quote  |  Print  |  Notify Moderator

Why stop at two batteries? If you can fit four, add four or more.

If I could only have two batteries, I'd go with two x 12v in case one went bad. With more than that though, my choice is always 6v since I could always limp by with just two 6v.


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time2roll

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Posted: 08/04/21 02:40pm Link  |  Quote  |  Print  |  Notify Moderator

Either option is inadequate for a 2000 watt inverter.

The less the dealer does the better. Smallest 12v is fine to get you home. Then you can do a proper install with 3 or 4 lithium batteries. [emoticon]


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wopachop

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Posted: 08/04/21 02:41pm Link  |  Quote  |  Print  |  Notify Moderator

It's got 2 fridges? Both residential?

Sounds like a nice trailer. I dont think 6v is the best choice for newer trailers running solar and large inverters. I would advise him to start researching lithium. Will cost more, but it doesnt seem like they're looking for a budget friendly setup to begin with.

If they need time to decide you could always borrow a 12v battery from a car just to get by for a camping trip. Assuming they will be on shore power. Make sure they know they need a battery in the trailer for the emergency brake.

ReneeG

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Posted: 08/04/21 03:06pm Link  |  Quote  |  Print  |  Notify Moderator

We dry camp a lot and use our solar for TV, Satellite, and computers, plus lights and charging. We have four 6V deep cycle batteries and we only have 300 watts of solar panels!


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