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I have a solar system similar to you which i fitted myself.

120watt panel and a 10 amp controller ( 120watts divided by 12 volt = 10 amps )

I would think the previous owner installed it,

they are very simple to install 2 wires from battery and two from the panel.

 batteries connected first and away you go free electricity.

The system is fully automatic the controller charges the batteries from the solar panel when they are full the charger floats the the batteries at full charge.

My controller cost £8 or less off ebay has 3 lights low,half, and full charge  second light tells when panel charging and the third is for an auxilary light when it gets dark auto switch on.

Obviously the lcd in your case has to be switched on, but if your controller goes wrong buy the cheap version

http://www.ebay.co.uk/itm/10A-20A-30A-PWM-Solar-Panel-Charge-Controller-Regulator-12V-24V-Auto-Autoswitch-/290787564113?pt=UK_Gadgets&var=&hash=item43b44a1a51

Pete

Quote: Originally posted by -mojo- on 06/11/2012

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I would guess that how it works will depend on who made it and what model.

It seems unlikely that every solar controller ever made would have the same switch, display and method of operation.

If you were to say who made the motorhome it might help, rather than just saying that it's German.

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Quote: Originally posted by snagz on 06/11/2012

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I would imagine that the 0.53 on the display could be charge current in amps.

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The solar panel controller works seperately to a battery charging set up from the 230 volt hook up.

Both are there to fill the battery, when its full the solar controller stops charging and waits for the battery to want more power.

The mains battery charger works the same if the battery doesnt want any power it waits to see if it needs some its called floating,

The read out probably is amps supplied but thats low for a 120 watt which are capable of much higer output but afterall its winter.

The only way to make sure is by fitting an ammeter in the positive supply from the solar panel.

I wouldnt really bother in the summer i can cane my batteries and by mid day they are full again on float.

I doubt the country of origin really matters most of these solar set ups come from the far east as do your batteries malaysia and china and  labelled over here.

Pete

I would agree

I wish i had fitted one long ago my generator is forsale

Pete