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Old 04 July 2012, 04:21   #1
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Battery Charging



I am after some advice, I have my rib stored indoors and have an electrical item powered on 24/7 and over the time of a few months it obviously drains the battery.

I do have two batteries, and the spare is isolated and used as a starting battery, but I donít like the idea of going out knowing one battery is almost flat. I have been trying to think of a way of getting round this, but not having much luck as I donít have access to power at the storage facility.

Currently I collect the boat the night before and get the battery charged before any trips or I try and go out every few weeks Ė but these arenít always possible.

Anyone have any ideas of a possible soloution?
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Old 04 July 2012, 04:27   #2
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Solar power, attach a small panel to the secondary battery ?
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Old 04 July 2012, 04:29   #3
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Solar power, attach a small panel to the secondary battery ?
I did think about this - but the boat is stored inside so hasnt got much light.


I think my only option I think will be rig something off the car to charge while towing.
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Old 04 July 2012, 04:33   #4
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I think my only option I think will be rig something off the car to charge while towing.
I could be wrong Steve, but I don't think that will work, an alternator only puts back what has been taken out, so if your battery is completely flat it would need a trickle charger to fully charge it up.
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Old 04 July 2012, 04:41   #5
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I could be wrong Steve, but I don't think that will work, an alternator only puts back what has been taken out, so if your battery is completely flat it would need a trickle charger to fully charge it up.


I have towed caravans for donkey's years you can use a split charger on the car and use an extra wire from the trailer board to charge the secondary battery, however on short journey it will not fully charge the battery.

If a battery is totally flat then you have a bigger problem, that it may end up being knackered

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Old 04 July 2012, 04:48   #6
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I could be wrong Steve, but I don't think that will work, an alternator only puts back what has been taken out, so if your battery is completely flat it would need a trickle charger to fully charge it up.
I believe that touring caravans charge the battery when going, but I think it might be a 12 volt charger inside van instead of using the car alt.

But a flat battery will take hours! Do you not have an isolator switch or disconnect battery...or if you have power use an smart charger.

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Old 04 July 2012, 04:55   #7
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SPR "I believe that touring caravans charge the battery when going, but I think it might be a 12 volt charger inside van instead of using the car alt."

Not so, it is a split charger from the car that charges the battery whilst moving, yes there is a 240v charger within the caravan, but that only activated when on Electric Hook Up (EHU)

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Old 04 July 2012, 04:59   #8
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But if caravan battery is flat the split charger would not be adequate to give it a full charge.
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Old 04 July 2012, 05:09   #9
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But if caravan battery is flat the split charger would not be adequate to give it a full charge.
As said previously if battery is Totally Flat there is a bigger problem.

Batteries do not like going under 10v and can sustain damage if this happens
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Old 04 July 2012, 05:15   #10
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As said previously if battery is Totally Flat there is a bigger problem.
Which is what I said in my first reply
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