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Old 17-07-2017, 15:54   #16
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Re: BATTERY CHARGING WHEN NOT ON BOARD

https://www.victronenergy.com/upload...tteries-EN.pdf

Definitely have the AGMs fully charged before leaving.

Check out this web site. A good battery would be OK left for 6 months at 20 degrees.
Topping up every month or two would be great but maybe not the cost effective option.
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Old 17-07-2017, 16:13   #17
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Re: BATTERY CHARGING WHEN NOT ON BOARD

Quote:
Originally Posted by ranger42c View Post
Our AGMs have never self-discharged very much over longish winter periods...

-Chris


This, disconnect them, good AGM batteries at lower temps self discharge rate is very slow.
I'd advise to eventually end up with the same chemistry and type of battery in all banks and avoid an over complicated charging scheme.
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Old 17-07-2017, 16:40   #18
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Re: BATTERY CHARGING WHEN NOT ON BOARD

In my experience, a healthy lead-acid battery that is fully charged by a known-good charger just before disconnecting all loads can be left disconnected for 6 months with no ill effects or loss of battery life.

The best possible arrangement would be to have some someone check the boat once a month while it's stored, and measure the battery voltages. Maybe put a charger on them for a couple of hours, then leave alone for another month.

Leaving some sort of trickle charger (solar or otherwise) on them permanently might not be the best option; they are devices that could fail, and if they're not intelligent or well-regulated, they could potentially overcharge the batteries.
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Old 24-09-2017, 13:53   #19
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Re: BATTERY CHARGING WHEN NOT ON BOARD

What about a charger on a timer? Could also be the solar panels on a timer. Let's say 8 hours every 14 days. In 6 hours I would not think any catastrophic would happen even if a battery would short. 6 hours would be enough to top up the batteries but not enough to cause a major melt down.
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