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Old 24-02-2015, 11:39   #16
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Re: Battery sulphated?

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Originally Posted by ullar View Post
Looks like a decent installation. I assume 9 mm is the diameter with insulation. Otherwise it would be more like a starter cable already (more than 50mm2).
+1. Calculated voltage drop (round trip) at 100A charging current into battery is about 0.2 volts. You can compare actual drop at bulk stage against 0.2V, any excess will suggest bad connections somewhere.
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Old 24-02-2015, 11:47   #17
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Re: Battery sulphated?

Your bank size is definitely smaller than desired when under way. Even going to 8 golf cart batteries you will need to run a generator every day.

If you get the solar charging squared away six golf cart batteries should be sufficient for at anchor in the tropics and sub tropics.

It should be noted that the batteries don't need to power the boat for the whole 24 hour period. The solar cells should be carrying the load while they are charging the batteries. I would guess that with a good solar set up the batteries would be under discharge around 14-16 hours a day. Hopefully maybe even less than 14. An additional thought is that though running a genset or main engine to charge the top 15% of the battery capicity is seldom done because of the batteries slow acceptance, if enough solar is available the battery bank may be completely topped off every sunny day. Input from folks using satisfactory solar would be interesting.

6 of the Duracell GC2s 645 amps X 30% = 190.5 amps ( as I figure it)
645 amps X 35% = 222.25 amps (as Charlie and many others figure it.)
Assume solar can handle the load 8 hours a day: 16 hours = 2/3 240 x .66 = 158
Six of the golf cart type batteries should stay happy a long time.
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Old 03-04-2015, 20:39   #18
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Re: Battery sulphated?

Finally after four months of anchoring and living off the solar full time we decided to go to a marina just to Eq the batteries. The specific gravity has returned to a little over 1.25 in each cell. I equalized for about 6hrs and the temp just rose from 22C to 24C. I feel I could have Equalized a bit longer but for now I think its done some good.
The battery monitor seems to be hitting the 14.8 set point earlier and remaining there most of the day, and probably a bit higher Voltage showing in the morning (around 12.7 instead of 12.5) after running the 2 fridges overnight. So far so good. We've had a few long sails since but not enough to really test the batteries.
Thanks again for all the input and help!
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Old 05-04-2015, 08:40   #19
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Re: Battery sulphated?

HOW TO SAVE YOUR BATTERY BANK WHILE DOING DOCK OR ANCHORAGE DUTY.

Protect your deep cycle batteries from shallow cycles.
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Old 05-04-2015, 09:26   #20
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Re: Battery sulphated?

Cool link
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Old 05-04-2015, 13:00   #21
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HOW TO SAVE YOUR BATTERY BANK WHILE DOING DOCK OR ANCHORAGE DUTY.

Protect your deep cycle batteries from shallow cycles.
Meaningless play of words.
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Old 08-04-2015, 00:32   #22
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Re: Battery sulphated?

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Originally Posted by Andina Marie View Post
HOW TO SAVE YOUR BATTERY BANK WHILE DOING DOCK OR ANCHORAGE DUTY.

Protect your deep cycle batteries from shallow cycles.
Is this an April Fools joke?????
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