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Motorhome Facts :: View topic - On board charger over-charging?

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 On board charger over-charging?
1067676 Post Posted: Wed Jun 01, 2011 2:22 pm Thank this member for this postReply with quote Back To Top

BritStops Subscriber 12/03/2013 


Joined: Mar 03, 2011

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Hi,

I have a 1994 Globetrotter and when I'm on hook up the battery charges well, but according to the gauge on the dash it continues charging right up into the red.

Now as the leisure battery gauge is the only one that actually works at all, I'm perfectly prepared to believe that the gauge is malfunctioning, but also slightly worried that the charger might be cooking my battery! Shocked

I've located the red fuse button on the side of the charger (it's the A501 model according to the German photocopied manual I have) and given it a quick depress, whereupon it pops back out again on its spring. It doesn't seem like it's meant to stay flush with the side of the charger.

I've taken the Calira unit out of the dash in the hope of finding loose wires or dirty connections, but all that wasn't ok was in a sealed unit. Same with the charger.

So, after that long-winded preamble: Rolling Eyes

1) Should I be worried about over-charging? I currently switch off the ECU when we reach the top end of the green section to prevent it going further. Could I leave it safely on?

2) Can I do anything about this that doesn't entail spending heaps on a new Calira unit or charger?

3) Should I start saving for a new motorhome? Sad

Steve

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1067734 Post Posted: Wed Jun 01, 2011 4:17 pm Thank this member for this postReply with quote Back To Top

BillCreer Subscriber 21/04/2013 


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Hi Steve,
Is your battery bubbling and getting hot?
If it is then the chances are is that your battery has a duff cell and as result never reaches the voltage that tells the charger to stop.
 
1067773 Post Posted: Wed Jun 01, 2011 5:40 pm Thank this member for this postReply with quote Back To Top

BritStops Subscriber 12/03/2013 


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Hi Bill,

Haven't noticed any bubbling or heating up. It's full now, so I'll put it on hook up and see what happens at the battery!

Steve

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1067787 Post Posted: Wed Jun 01, 2011 6:14 pm Thank this member for this postReply with quote Back To Top

BritStops Subscriber 12/03/2013 


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Ok, it's been on hook up for about 25 minutes now, and the gauge has gone up to 15 again and is hovering around the red section of the gauge.

The battery is cool as a cucumber though, and there is no bubbling. Could it be that the gauge is out and it's on a float charge?

When it's off charge it creeps back down to about 13.5 ish (difficult to tell on an analogue gauge).

I'll leave it on for a bit longer and see...

Steve

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1067894 Post Posted: Wed Jun 01, 2011 8:36 pm Thank this member for this postReply with quote Back To Top

BritStops Subscriber 12/03/2013 


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Ok, now been on hook up for an hour or so, and gauge is reading about 14.5 in the red.

Battery is still just as cool as ever, but when I put my ear to it I can hear fizzing/bubbling. Doesn't sound like a boiling kettle, more like an alka seltzer.

Ideas, anyone?

Steve

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1068007 Post Posted: Thu Jun 02, 2011 12:07 am Thank this member for this postReply with quote Back To Top

BillCreer Subscriber 21/04/2013 


Age: 64

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Hi Steve,
If a normal battery is charging in normal conditions then it will fizz. That's what batteries do when they are charging.
If it's not getting hot then all sound fine.
 
1068037 Post Posted: Thu Jun 02, 2011 6:55 am Thank this member for this postReply with quote Back To Top

BritStops Subscriber 12/03/2013 


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Hi Bill,

That's great, thanks! Just me worrying about nothing then! Laughing

I guess the weary old gauge is just playing tricks on me.

Steve

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