Losing power overnight

Vdub384

Free Member
Oct 28, 2014
5
0
Blackburn,Lancashire
MH
Bedford ADVANTURA
Exp
Since 1997
Hi I have 2x80 watt panel connected through a 20 amp charge controller to 2x 110 amh leisure batteries, the problem I am having is I'm losing voltage overnight, I've even installed a diode between the +panel lead and the charge controller but still lose power. As a test last night I disconnected one battery and this morning the connected one was down to 12.62v whereas the disconnected battery was 12.96v. My charge controller stops charging at 13.5v and starts again at 13.4v any help would be most appreciated .
Dave
 

Jim

Ringleader
Jul 19, 2007
29,024
84,139
Sutton on Sea
MH
C Class Diesel RV
Exp
Since 1990
Check the Lunar Panels that Eddie vanbitz sells, solved my overnight discharge issues overnight (y)

Seriously...
Hi Dave, what motorhome is it?
 
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Vdub384

Free Member
Oct 28, 2014
5
0
Blackburn,Lancashire
MH
Bedford ADVANTURA
Exp
Since 1997
Hi Jim it's an old classic 1979 Bedford cf350 ADVANTURA had it for over five years now and before that was a VW bay window 1970.
Dave
 

Jim

Ringleader
Jul 19, 2007
29,024
84,139
Sutton on Sea
MH
C Class Diesel RV
Exp
Since 1990
I wouldn't know where to start Dave. Something is drawing it. If you can't find what it is, it might be worth fitting a battery isolation switch.
 

BwB

LIFE MEMBER
Apr 3, 2011
773
681
Suffolk UK
MH
PVC
Exp
Since 1990
A full battery voltage will settle down to around 12.7v once all charging (by any method) has stopped. You're bound to have some drain on the electrics overnight too, but as hilldweller said above - your morning voltage seems about right.
 

Wildman

Free Member
May 30, 2008
1,541
8,617
Ilfracombe, Devon
MH
Amazon Ambassador
Exp
since 1967
what you see at the end of the day is surface voltage which drops off to a fully charged level after about an hour. not a lot to worry about.
 
Jan 28, 2008
5,666
5,584
walthamstow east london
MH
renault burstner delphin
Exp
7 years campers before that
i suspect the first reading was with the solar still putting some in you need to wait an hour after sundown to take the evening voltage
 
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Vdub384

Free Member
Oct 28, 2014
5
0
Blackburn,Lancashire
MH
Bedford ADVANTURA
Exp
Since 1997
12.62 is fully charged, what's the problem ?
As I recall from all the battery sites I've been on 12.8v is fully charged and like I said the disconnected battery was 12.96v, I've read up fairly well on batteries and most places state that 24 hours rest after a full charge the voltage of a good battery should be 12.8v, it's losing it through the panel as I see it I've change over to switching that battery off and seeing what voltage the other battery previously 12.96 this morning is tomorrow I'll get back with my findings.
Dave
 
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