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Old 03-20-2013
mdbee mdbee is offline
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AGM batteries "Depends"

In my case AGM's seem to have done well. When I say in my case, I am talking about going on 7 years with 2 Optima AGM's. I just pulled them and had them checked at Interstate on one of those high dollar testers that Maine Sail recommends. In fact they showed quite a bit above there "rated" capacity. Unfortunately, I don't have a baseline to compare them to since I didn't have them checked when I first bought them.

Since the boat sits on a trailer most of the time and they have been discharged rarely, usually never below 11.0 - 11.5 volts (?) They have also been connected to a fan running 24 hours/365 days a year for the past 5 (?) years. They have been connected to a 20w solar panel with a Morningstar Duo controller (4 stages).

They have never been "equalized" and only occasionally I throw them on a pulse charger over night. I'm not saying that I recommend the way they have been maintained, only listing the facts.

I realize if you are a cruiser and actually get to use your boat regularly and your batteries go through the normal discharge cycles, your mileage will vary.

Although they have held up well, I got them at a ridiculous price from a friend years ago. I would find it hard to pay what they go for now. They are nice because the batteries are hard to get to if I had wet cells it would be a pain.

They will now probably go belly up.
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