EHU, most economical way?

Jul 10, 2014
979
3,842
the Berwyn Mountains
MH
Hymer S740
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since 2009
Just come back from a week and I was going through the motions one of which is putting the MH on hookup so as to keep fully charged.



I got to thinking, would it be more economical to fit a 7 day or longer timer and have it on intermittently rather than constantly. Anyone do that? What are your time intervals?



Dick
 
Nov 18, 2011
10,019
19,336
2 hrs. day would do it the battery's would not have hat any thing drawn from them
I am sure that some one will be along to shoot me down in flames
 

GJH

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Aug 20, 2007
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Acklam, Teesside, originally Glossop
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Most of the year the solar panel keeps both the habitation and starter batteries topped up. When we use the van I normally put the EHU on the day before to cool the fridge down and that deals with any solar shortfall. If other commitments prevent us from using the van for a few weeks in winter then putting the EHU on for a day now and again tops the batteries up. No need to do it more frequently.
 

Inthezone

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Feb 14, 2014
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Berkshire
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2
Do you have a solar panel?, if you do would it be better to have the mains on only ovenight for a few hours as Bill suggested and let the pannel do its work during daylight hours
 

Puddleduck

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Jan 15, 2014
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Scottish Borders
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SunLiving Lido M45SP
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Forgive the ignorance but if the van isn't being used and you have a solar panel why do you need EHU overnight? The solar should keep the batteries topped up, shouldn't they (unless there isn't enough light of course)?
 

Kool Kroozer

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Apr 19, 2014
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We have left our fridge on for about 10 days (the longest time) while in storage, the solar panel has supplied it without any problems, and with a battery master fitted also we have never had any problems with starting the engine either !
PS: We was never aware that the fridge was "ON" at the time, (it must have been on for a few months while in storage) was always made to think that if the leisure battery control panel was turned "OFF" that all the on board electrics was "OFF" also - if you do not have any solar power its well worth investing in (y)
 

tonka

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Jul 2, 2008
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Getting back the original question and putting solar panels aside..
I dont think there is any point of a timer at all, the on board charger will only operate when the batteries need charging, so in therory once the initial charge is complete it will turnoff or go on a very low trickle when it needs it. ie if something puts a draw on the battery..
Am I right ????

Then again... Have my 80w solar panel and it keeps everything charged up and never plugged in at home in 2 years since fitting !!!! :)
 

Snowbird

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Apr 24, 2009
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The only time I plug in is on long stays on campsites where am charged for electric. If you have solar, then as long as there is no snow on them they should keep on top of any battery drain.
 

Ed Excel

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Nov 27, 2012
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Think the OP needs to determine the quality of his battery charger, ie, is it intelligent enough not to boil the battery. With staged charging permanent connection should be fine. Killing a battery will probably cost more than the electricity used to do it.
 

oldun

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Mar 23, 2008
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The only time I plug in is on long stays on campsites where am charged for electric. If you have solar, then as long as there is no snow on them they should keep on top of any battery drain.

A rather sweeping statement. can your battery system cover air con, tvs, DVDs, computers, hair dryers, hair straighteners and a wide range of other equipment which some seem so keen on using?

These people struggle on 16 amps so no way could s solar panel array produce adequate power.
 

Snowbird

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Apr 24, 2009
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A rather sweeping statement. can your battery system cover air con, tvs, DVDs, computers, hair dryers, hair straighteners and a wide range of other equipment which some seem so keen on using?

These people struggle on 16 amps so no way could s solar panel array produce adequate power.
I take it you did not read the OP. Why would the OP want to run that lot if his van was in storage ?. But in answer to your question, YES it can.
 

joner8888

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Jan 4, 2012
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somerset
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A few years now
A rather sweeping statement. can your battery system cover air con, tvs, DVDs, computers, hair dryers, hair straighteners and a wide range of other equipment which some seem so keen on using?

These people struggle on 16 amps so no way could s solar panel array produce adequate power.

Off track a little--
While on a site last week i noticed a full season pitch owner next to me in a caravan packing up for the end of his weekend stay.
He came out to the EHU terminal and swapped back in the companies RCD and took his own (probably higher rated) back out !
They seemed to just slot in and out.
Got me thinking !!:D
 

Munchie

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Jul 28, 2007
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Off track a little--
While on a site last week i noticed a full season pitch owner next to me in a caravan packing up for the end of his weekend stay.
He came out to the EHU terminal and swapped back in the companies RCD and took his own (probably higher rated) back out !
They seemed to just slot in and out.
Got me thinking !!:D
Is this not very dangerous if your van wiring is only rated at 16amp?
 
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