Solar charging starter battery (1 Viewer)

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Mr bean

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Aug 17, 2020
32
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Dethleffs 4-Travel.
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Since 2006
Hi all, I’ve got a little 4.8W solar panel just to keep my batteries topped up, it plugs in to the van 2016 Dethleffs 4 Travel through the engines diagnostic plug and the starter battery is showing 13v the leisure battery is only 12.5v is this because of the way it’s connected!!
 

golly

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Aug 16, 2009
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HYMERCAR PVC
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I would imagine that it is because there is no direct connection to the leisure batteries from the diagnostic plug, unlike when charging via the on board charger. But there again "I know nothing" :giggler:
 
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Mr bean

Mr bean

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Aug 17, 2020
32
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Dethleffs 4-Travel.
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Since 2006
Thanks golly, I thought that might be the case. I definitely know nothing!!!
 
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Mr bean

Mr bean

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Aug 17, 2020
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Dethleffs 4-Travel.
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Since 2006
Thanks chaser! Looks like I’ll have to go full solar.

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Apr 20, 2020
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Northern Ireland.
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Adria Compact SC.
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I am no expert but is a 4.8W panel going to keep a battery topped up?
I would think that during the winter it will be doing nothing.
 

pappajohn

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Aug 26, 2007
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Just bin the panel.....4.8watt is neither use nor ornament.
Maybe in North Africa with the sun directly overhead the most it will put out is around 300 milliamps (⅓amp)...the batteries natural drain plus parasitic loads will exceed that.
You want at least a 30watt panel and an endless clear day to make a difference.
The starter battery would be showing 14v plus if it was doing anything useful.
 
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Mr bean

Mr bean

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Aug 17, 2020
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Dethleffs 4-Travel.
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Since 2006
Definitely puts something in, I’m in Spain at the moment so getting plenty of sun. But think I need to do it properly and get 125W solar panel and mppt controller.
 

Stealaway

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Jan 8, 2013
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I think your money would be better spent on two solar panels and a regular dual battery solar controller

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