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Old 31 January 2013, 08:35   #1
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Charging batterys

I want to give the battery's a bit of a charge with a charger
Normally I would disconnect the cables but seem as they are on isolator switches can I get away with it.
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Old 31 January 2013, 09:02   #2
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Right or wrong I always charge mine in situ. I just make sure I don't turn anything on while charging. Never had a problem
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Old 31 January 2013, 12:51   #3
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Small chargers under 10 amps should not take the voltage at the terminals over 14 volts. So no risk of damage as long as the battery is in good or fair condition. Check this, and do not over charge.

Batteries that are in poor condition can have too many volts at the terminals during charging, risking damage.

The isolator switch will be the same as disconnecting, as long as not turned on during the charge.
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Old 31 January 2013, 13:19   #4
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Quote:
Originally Posted by simsy
Small chargers under 10 amps should not take the voltage at the terminals over 14 volts. So no risk of damage as long as the battery is in good or fair condition. Check this, and do not over charge.

Batteries that are in poor condition can have too many volts at the terminals during charging, risking damage.

The isolator switch will be the same as disconnecting, as long as not turned on during the charge.
That's what I was thinking but thought best ask to be sure.
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Old 31 January 2013, 15:32   #5
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Quote:
Originally Posted by simsy View Post
Small chargers under 10 amps should not take the voltage at the terminals over 14 volts. So no risk of damage as long as the battery is in good or fair condition. Check this, and do not over charge.

Batteries that are in poor condition can have too many volts at the terminals during charging, risking damage.

The isolator switch will be the same as disconnecting, as long as not turned on during the charge.
You can't have too many volts..........

Eh? where the f. did this "scientist/technic" jump onto the "I know volts" boat?
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Old 04 February 2013, 15:27   #6
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Quote:
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You can't have too many volts.........
At risk of sounding like a pantomime... Oh yes you can!

After fitting a voltmeter I found my rectifier was throwing out 19V at 1500rpm and increasing with revs. Lets just say that the result explained both the incessant dry inside my console and the rapid degradation of the battery capacity.

To misquote a film- "you could fry an egg in your console".
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Old 04 February 2013, 16:22   #7
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Depending on the type of batteries charging voltage can be critical. I run nothing but AGM's anymore so a nice C-TeK battery charger serves my needs and will handle most any 12 volt battery. They also will settle into a nice float charge, so they never need to be disconnected. You can put a charging port on the boat and plug the charger in when desired.
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