Electrics help needed

Mar 11, 2013
1,100
1,259
Arundel
Funster No
25,066
MH
A Class
Exp
since 2009
Having a few issues with the van around electrics.
Since coming out of lock down have given the van a couple of run outs to check on everything. 1st run out back on 30th March found the the motherboard on the Dometic fridge failed and new one ordered and due to be replaced. At the same time the 1 year Sterling B2B sent out an overheat alarm. The b2B was removed and sent back to Sterling who fixed the charger (It was a faulty fan).
The B2B was returned to me and on Thursday this last week it was reinstalled and found to be working correctly.
Now here things start acting strange.

On that Thursday having installed the B2B took the van for drive for an hour also the van was left in a sunny location with solar panel doing its bit. I noticed by late in the afternoon the battery level on the control panel was showing 13v. (I do not have a Victron battery monitor)
So the van was left unattended around 6pm now in shade, we were due to be in the road the following day so around 10.ppm I had reason to go in the van and after opening up and turning on the lights a bleep alarm was activated from the control pane. I noticed that is was the alarm for low voltage in the leisure batteries.. It was showing 10.6v and very soon after the control panel shut down and light failed. Clearly the safety power cut off had kicked in.

Took the van for a drive and the B2B kicked in. An hour later battery level above 11v. Following morning reading down to 10.6 or something but no shut down.
Then Friday on the road for two hours and then sat around in full sunshine for 4 hours, again battery level 13+ v. Followed by another 2 hour drive. Parking up at 7.30pm with a good 13+v on the indicator. Following morning battery level 10.6v frost all around use needing heating on so start engine, B2B giving charge and showing 14v charge. Sun soon up and without B2B again volt level slowly climbs uptown over 13v on solar.
Again overnight volt level drops down to 10+volts. The van had not been used whilst left unattended until we returned to it to sleep at 11.00pm when the low volt level seen. This morning fro m10 v with a drive and solar by 12pm volt showing over 13 v.
So decided to check if the battery is simply failing to hold any charge. I decided to remover the main mega fuse from the B2B so any possible draw from that could not occur and then turned the leisure battery isolator switch off thus no draw from the habitation side.

Five hours later wanting to check if the batteries were holding a charge. I turned on the isolating switch, now 12v power has got to the control panel but all that is happing is the screen is flashing on and off thus seeing all the symbols that could be illuminated in the screen but the screen is not lite up by the back light. Pressing the on/off button is not activating the control panel thus no supply is getting through to the ,light and pump. 12v is supplied to the heating controller but again it will not start heating or hot water boiler. The fridge has 12v supply and will work on gas(even with the faulty fridge control panel as it would do this but will bot switch off and switch automatically thus a nw panel to be fitted)

I have disconnected the positive feed to the isolation switch and then plugged in EHU and the control panel does exactly the same as on 12v

So are there any thoughts out there what could be the problem
 
Last edited:
Apr 27, 2016
3,117
3,056
Manchester
Funster No
42,762
MH
A class Hymer
Exp
Since the 80s
One way a battery fails is that one of the six cells short-circuits. If you do the maths you'll see that if 6 cells give 12.6V then 5 cells give 10.5V.

The chargers (B2B, solar etc) will temporarily lift the voltage, but with no charging it settles back to 10.5V again. Sorry, but it looks like a new battery is needed.

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Sep 29, 2019
1,313
3,066
Funster No
64,846
MH
Hymer Exsis
Exp
20 years
I would go for hab battery being knackered as well.

Mine did the same when it failed.
 
OP
PJGWiltshire
Mar 11, 2013
1,100
1,259
Arundel
Funster No
25,066
MH
A Class
Exp
since 2009
I half expected that and I was looking to change them to Lithium so them crashing is not a real issue. I know I gave a lot of history leading upto today, its around the control panel that is concerning me. The failure of that is strange. Is it the case that as the batteries have now crashed very low say 3 or 4 volts, as I had totally isolated them from solar, when I turned them on something within the controller has kicked in as they are very low voltage thus the controller will not start up. Even 240v supply will not work. Is it a case the they controller needs to see batteries up in the 13 v range before it will allow itself to now restart as its shut down into a safe mode?
 
OP
PJGWiltshire
Mar 11, 2013
1,100
1,259
Arundel
Funster No
25,066
MH
A Class
Exp
since 2009
I would go for hab battery being knackered as well.

Mine did the same when it failed.
To just confirm, when your batteries failed your controller just shut down and would not restart until new batteries?

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Sep 29, 2019
1,313
3,066
Funster No
64,846
MH
Hymer Exsis
Exp
20 years
Not quite, it was a dumb system so wasn’t that clever. I know in the Hymer it won’t switch back on till a certain voltage though.
 
Jan 19, 2014
5,881
14,485
Derbyshire
Funster No
29,757
MH
Elddis Accordo 105
Exp
since 2014
To just confirm, when your batteries failed your controller just shut down and would not restart until new batteries?
Our battery failed with a shorted cell in 2019, was reading 10 odd volts after the solar controller shut down. It shut down due to high battery temperature. It had been throwing 7+ amps at it all day 😏
 
OP
PJGWiltshire
Mar 11, 2013
1,100
1,259
Arundel
Funster No
25,066
MH
A Class
Exp
since 2009
Our battery failed with a shorted cell in 2019, was reading 10 odd volts after the solar controller shut down. It shut down due to high battery temperature. It had been throwing 7+ amps at it all day 😏
Yes found one if the batteries very warm and smell coming from the area of batteries. Was going to buy Lithium but just went ahead and ordered replacement Gells. Will be here in next two hours. Just hope the controller resets its self

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