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 > AGM batteries & solar battery tender

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bgum

South Louisiana

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Posted: 09/11/22 04:50pm Link  |  Quote  |  Print  |  Notify Moderator

As stated by several people above disconnect a wire from the battery. An AGM will need charging after about 4 weeks or so even if you disconnect a wire. I suggest you disconnect a wire and put 10 watt maintainers on each battery. A disconnect switch is not adequate.
It may be simpler to bring the batteries home with you.

Grit dog

Black Diamond, WA

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Posted: 09/11/22 10:24pm Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

garmp wrote:

My coach has a switch to disconnect the coach battery. Would that be sufficient enough rather than manually unbolting the batteries?


If you never cold weather camp, then LiFePo4 are a similar price to AGM. They can be stored for a long time with no charging--and in fact it is best to store them at 50% state of charge.

The other solution is a small solar charging system.

The disconnect switch may not eliminate all parasitic loads. Best to disconnect the negative post.


By similar, do you mean the cheapest Li are similar to the most expensive AGM batteries?
If apples to apples are similar, I’m very interested but haven’t seen that.


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Starchmill

Southern NH

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Posted: 09/12/22 04:06am Link  |  Quote  |  Print  |  Notify Moderator

Just my experience, but I bought 2 AGMs for my Camper 10 years ago. They have always been outside in the Northeast winters. I pull the battery disconnect in late fall and dont touch it again until March or april and the Batteries have held up just fine. Totally worth the added expense considering the long life I have gotten out of them. I used to check on them once a month but never found them to need charging and then the past several years I havent checked at all and they are just fine over the winter without any additional charging. Maybe this isnt everyones experience, but it is mine and i have been extremely happy with the AGMs.


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pianotuna

Regina, SK, Canada

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Posted: 09/12/22 04:49pm Link  |  Quote  |  Print  |  Notify Moderator

grit dog,

Similar in price li to agm but do require proper care. Not useful in the cold.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

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