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Old 08-07-2011, 10:54   #16
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Re: New boat, poor battery performance - need advice

The battery voltages were under load, so they don't equate to completely discharged cells--when a battery is completely discharged the voltage falls rapidly. The boat is new, so corrosion is probably not an issue, but I agree with the suggestion to check the voltage drop and wiring size from the chargers.

For future upgrades, LED replacement bulb for the anchor light will drop its consumption to 0.2 amps, a netbook computer will draw 1 amp.

When I replaced my gel batteries with cheap wet acid ones in Greece, the operating voltage fell about 0.5v. Things still worked pretty well for over a year, and I was finally able to find decent batteries duty free in Gibraltar for less than a king's ransom.

At least you are able to enjoy the new boat--I talked to one cruiser who had to run his main engine 10 hours a day to keep the batteries charged on the passage from California to Hawaii, but he still made it.

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Old 08-07-2011, 12:09   #17
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Join Date: Dec 2007
Location: Australian living on "Sea Life" currently in New York
Boat: Beneteau 393 "Sea Life"
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Re: New boat, poor battery performance - need advice

Right! I see the problem!

I could be come a scientist or a boat fixer bloke!

10:00 14.0V 72.0A 496Ah Genset on
10:10 14.0V 49.0A 504Ah
10:25 14.1V 33.0A 513Ah
10:30 13.1V 3.0A 517Ah
10:35 12.7V -18.6A 517Ah Battery charger off
10:35 14.1V 34.5A 517Ah Battery charger on again
10:40 14.1V 27.0A 520Ah
10:55 14.15V 22.0A 526Ah
11:05 14.2V 21.0A 529Ah
11:06 13.2V 3.0A 529Ah
11:07 12.8V -17.7A 528Ah Battery charger off
The charger is only working for half an hour before it drops the charge. So the batteries are not charged much at all.
The 12.7 is only a surface charge. Load it and it'll drop.

As a test: Can a regulator be by-passed so the full charge goes straight in without stop down? Or does this blow the boat up?


Notes on a Circumnavigation.

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