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Old 12-15-2013, 05:27 PM   #15
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MN_Traveler's Avatar
Join Date: Apr 2012
Location: Minneapolis, MN
Posts: 375
def - to avoid a long quote, I will reply to your post "by the numbers"

1 & 2) Agreed - batteries dead & frozen and are now paperweights.
3) I have been exercising the generator about once a month because a) it is my understanding that the generator mechanism (not the engine) suffers from lack of exercise at least that often, and 2) I have found that the self-discharge of my batteries would lead them to overly discharge if I do not charge them that frequently (trying to avoid point 1&2 above!! )
4) My inverter/charger does support AGM-type batteries (it is a Magnum MS Series)
5) the fact that I have seen significant self-discharge of the batteries is why I have tried to exercise the generator and charge them during the winter storage.
6)I do indeed know better than to not disconnect the batteries - which is why I am surprised that I neglected to do so last time :-(
7) AGM's have several very appealing aspects to me: a) they have a much lower self-discharge rate - and hence should present less risk of #3 above leading to #1 &#2 above... ALSO, the maintenance of the flooded cells (checking water level, cleaning the corrosion from them, etc) has been a real headache for me: it is worth the price for the AGM's to not have to face that. And yes, we do fairly often find ourselves boondocking, so if the AGM's allow more peace of mind for us, likewise that will be worth it...
8) I ALWAYS use fuel conditioner (and algea inhibitor) during winter storage.

Edina: we live in Edina ourselves: great neighbors and great school system. Staying Warm ... in Minnesota in the Winter????? HAHAHAHAHAHAHAHAHAHAHAHAHAHA

(I hope you are in warmer climes!)

- 2012 Fleetwood Expedition 36M -
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Old 12-15-2013, 05:44 PM   #16
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Join Date: Feb 2012
Location: SE Michigan
Posts: 459

I do (or did before the depression) a lot with batteries.
Yes, there is a chance, a good chance that they will not recover.
But, that is by no means a certainty.

Unless you want to scrap them, take them to some place warm and put a low rate charge on them for as long as you can stand. If they are going to recover, surprising them with a high charge rate may just piss them off so much that they quit.

Do not try to charge them in parallel as one may be damaged and it will prevent the others from charging as they need. If you have to time share the charger that will not be too bad.

WARNING - Put the batteries in a known water tight and acid proof tub or box. They may have cracked the case and you have to be careful until you are certain.

There is also a chance that a cell divider has been breached. This will cause a battery to look good buy be the wrong voltage (like 2.2 volts low).

I wish you luck.

A lifelong waterman and his bride going dry places for as long as the fuel money lasts.
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batteries, generator

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