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post #1 of 19 (permalink) Old 19-05-2020, 12:36 Thread Starter
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Is connection to EHU bad for batteries?

I read somewhere that keeping your MH permanently connected to EHU can damage your leisure batteries and they advised connecting once in a while.

Is this true?

Jean
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post #2 of 19 (permalink) Old 19-05-2020, 12:45
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Not if your batteries are regular lead acid Jean. Lead acid batteries last longer if kept fully charged.
But you don't want them to be on any old charger as some just keep charging and cooking and don't cut off when full. Most van chargers monitor the state of the battery and shut off when fully charged at about 14v. and cut back in again when the volts drop to about 12.6v.

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post #3 of 19 (permalink) Old 19-05-2020, 15:40
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Quote:
Originally Posted by jiwawa View Post
I read somewhere that keeping your MH permanently connected to EHU can damage your leisure batteries and they advised connecting once in a while.

Is this true?
I do not know if it is ever true but there are thousands of uninterruptible power supplies [UPS] in industry, transport etc that are permanently connected to charging systems. The batteries are normally maintained with a 13.8v 'trickle charge'. The ones I used to work on were used in railway communication systems and battery life was in excess of 5 years.

My Pilote uses a Schaudt Electroblock unit and this has no separate charger ON switch. If it is on EHU then the charger is ON. I have not experienced any problems in the 3 years I have had it. I carry out load tests on the batteries regularly and they have always been ok. I guess it depends upon how smart the charger is. Left to an old fashioned single stage charger then I can see problems but not a modern multi stage one. It is only my experience and of course there will be some people with different ones, perhaps their batteries will have got hot, exploded etc.

Last edited by rayc; 19-05-2020 at 15:44.
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post #4 of 19 (permalink) Old 19-05-2020, 15:45
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Ive never understood the idea of constantly keeping your van hooked up and on charge. I just make sure mine are isolated (Cab and leisure) and leave them like that for months, often over winter. Never seems to do any harm and this is my second leisure battery in 12 years of ownership. Must be about due to croak as I think I got it in 2014 in France. They cost the same roughly as a full tank of diesel so if they last five or six years then I reckon like that you cant complain really.


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post #5 of 19 (permalink) Old 19-05-2020, 16:58 Thread Starter
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Well, my van is 2017 so hopefully has sufficiently modern equipment to cope.

The reason I put it on EHU is that during the winter the solar wasn't sufficient to keep the charge up.

I wouldn't be happy to do the isolation of batteries Barry - as you know, electrics are not my forte!

I could just turn it off, in the house but if I don't need to that's great!
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post #6 of 19 (permalink) Old 19-05-2020, 17:11
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It has been very rare in the seven years we've had the Motorhome to put our Pilote on EHU at home or away.

An 80w Solar panel keeps both the Leisure batteries and Starter battery topped up throughout the year, with a CBE CSB2 trickle charger between the batteries, and I haven't had the hook up cable out at all this year despite not being able to take the Motorhome out for a run.

The Banner batteries lasted over five years, despite rarely using campsites when abroad, and the newer Yuasa batteries also seem to have no problems.

I have a couple of LED Mini Digital Voltmeter Volt Meter Gauge Voltage Panels (a few quid each) to show the resting voltage of the batteries and can see how the batteries are when stood on the drive for any length of time – ie, lockdown.

The only drain on the batteries while stood is the Alarm system and the Solar panel copes easily with that.

I know everyone's Motorhome is different but, like me, I try to keep things simple and the Motorhome just keeps 'ticking' along without much input from me and I like to keep it that way if possible.

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post #7 of 19 (permalink) Old 22-05-2020, 21:55
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My understanding is that with an "intelligent" battery charger then you aren't doing any harm to the batteries by leaving it permanently connected. Conversely you can do harm if you repeatedly allow the batteries to discharge too far before recharging. Or looking at it another way, what about all those vans with solar panels that are permanently outside? Unless the panel has been isolated the batteries are being continually charged which is one of the great advantages of a solar panel.

My van used to live outside and the solar panel would keep the batteries fully charged all the time - the alarm and immobiliser being the main drains. It's now under cover so I have it permanently connected as it's easier than having to charge it every month or so..

Peter
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post #8 of 19 (permalink) Old 22-05-2020, 22:09
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Quote:
Originally Posted by jiwawa View Post
Well, my van is 2017 so hopefully has sufficiently modern equipment to cope.

The reason I put it on EHU is that during the winter the solar wasn't sufficient to keep the charge up.

I wouldn't be happy to do the isolation of batteries Barry - as you know, electrics are not my forte!

I could just turn it off, in the house but if I don't need to that's great!

Ah well, the joys of owning an older motorhome you see. All I do on mine is whip off the negative battery lead under the bonnet and turn off the switch for the leisure battery and its isolated. Even a mechanically challenged numpty like me can manage that. Different story I guess on new vans with their fancy electronics and stuff.


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post #9 of 19 (permalink) Old 22-05-2020, 23:12
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I have a 2003 MH with the original Schaudt EBL charger, so I do not know how 'smart' that is.


I have left it on permanent EHU or last few winters and do check the voltmeter regularly and it has never been overcharging.


I have had no problems and the batteries remain charged up.


Geoff
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post #10 of 19 (permalink) Old 23-05-2020, 07:54
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My EHU is connected although I only switch the charger on when the solar can’t cope in winters dark days, luckily it’s at the side of the house therefore easy to monitor. If yours is in storage Jean, I suspect your modern vehicle has a charger that is ‘intelligent’ therefore as mentioned above OK to leave on charge. Check your manual or contact Donaghys for advice.

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