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Old 12-09-2014, 13:22   #1
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When on shore power why do I always see charge going in?

I sometimes wonder if buying this battery monitor was a good thing. It's opened up so many holes in my knowledge it almost scares me.

The latest one that popped up was this.

After three days on shore power why do I constantly see a charge of 2 or so amps going into the batteries? Is that normal? Shouldn't they get 'full' at some point?

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Simon



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Old 12-09-2014, 13:29   #2
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Re: When on shore power why do I always see charge going in?

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Originally Posted by simonpickard View Post
I sometimes wonder if buying this battery monitor was a good thing. It's opened up so many holes in my knowledge it almost scares me.

The latest one that popped up was this.

After three days on shore power why do I constantly see a charge of 2 or so amps going into the batteries? Is that normal? Shouldn't they get 'full' at some point?

Regards,
Simon



Please visit my blog:
Sailing-Interlude | Sailing the Medů and beyond
There will always be a float charge going in to keep the batteries maintained and to compensate for self discharge. It's perfectly normal and needed to keep your batteries from self discharging.
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Old 12-09-2014, 14:03   #3
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Re: When on shore power why do I always see charge going in?

Thank goodness for that. One thing to tick off the list of 50 or so things I don't understand!

Thanks for the reply.
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Old 12-09-2014, 15:16   #4
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Re: When on shore power why do I always see charge going in?

When I shore power, I have never seen less than 2 amps charging, but also take note that the voltage showing on the BM is the float voltage setting of the charger.
If you have 2 Amps but at say 14.8 volts, you might have a problem.

On the bright side, only 49 or so things to get to grips with
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Old 13-09-2014, 10:10   #5
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Re: When on shore power why do I always see charge going in?

We never see more than 14.5v



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Old 13-09-2014, 10:17   #6
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Re: When on shore power why do I always see charge going in?

Quote:
Originally Posted by simonpickard View Post
I sometimes wonder if buying this battery monitor was a good thing. It's opened up so many holes in my knowledge it almost scares me.

The latest one that popped up was this.

After three days on shore power why do I constantly see a charge of 2 or so amps going into the batteries? Is that normal? Shouldn't they get 'full' at some point?

Regards,
Simon



Please visit my blog:
Sailing-Interlude | Sailing the Med… and beyond

How big is the bank?

How old is the bank?

Is it possible you have a load bypassing the shunt?

Even when "full" batteries will take some current. Healthy batteries will drop into the tenth or hundredth of an amp acceptance rate but sulfated batteries can take more for longer...

It is also possible your chargers power supply is simply switching on and off to maintain voltage and not over shoot it. Many chargers have rather poor low current resolution. Watch the ammeter and see if it occasionally blips off then back on..
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Old 14-09-2014, 00:17   #7
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Re: When on shore power why do I always see charge going in?

The bank is 2 x 150 amp
It was a new boat in March
Can't see any load before the shunt



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