ClarkeKent Posted April 9, 2013 Share Posted April 9, 2013 Hi I have a 2005 Lunar Roadstar 786 called Monty. I was wondering if anyone could advise me as to why the engine battery has gone flat whilst the motorhome was connected to the mains electricity. I thought being connected to a mains suppy would keep both batteries fully charged by the onboard charger.. Advice would be appreciated.. (?) Link to comment Share on other sites More sharing options...
colin Posted April 9, 2013 Share Posted April 9, 2013 Not sure of your Lunar, but not all vans charge the vehicle battery whilst on mains Link to comment Share on other sites More sharing options...
myshell Posted April 9, 2013 Share Posted April 9, 2013 Have you checked on your control panel to see if there is a switch that changes the charge over from starter battery to leisure battery ? Link to comment Share on other sites More sharing options...
tugga Posted April 9, 2013 Share Posted April 9, 2013 We have a Hymer on a 56 Plate and the same thing happened to us. Our battery went flat whilst it was on EHU and we got stranded on a site with no-one to help us, thank heavens for dog walkers. :-D We ended up having to buy a new one, they don't last forever. I am presuming that you still have the original battery on your mh? Link to comment Share on other sites More sharing options...
Cliffy Posted April 9, 2013 Share Posted April 9, 2013 Welcome to the forum Clark, I would have thought you would not have had any problems pushing the the van off the site by yourself or did you not want to give your identity away ..Sorry couldn't resist >:-) On our MH we have a factory fitted switch that can select leisure or engine battery to charge from ehu but the previous owner fitted a Vanbitz battery master which automatically uses any surplus power from the charger to top up the engine battery, as we have a solar panel it works very well, it keeps all the batteries charged when she is in storage. There is a great wealth of knowledge on this forum, i am sure there will be someone along shortly who will be able to give specific advice on your van. Link to comment Share on other sites More sharing options...
Cliffy Posted April 9, 2013 Share Posted April 9, 2013 Welcome to the forum Clark, I would have thought you would not have had any problems pushing the the van off the site by yourself or did you not want to give your identity away ..Sorry couldn't resist >:-) On our MH we have a factory fitted switch that can select leisure or engine battery to charge from ehu but the previous owner fitted a Vanbitz battery master which automatically uses any surplus power from the charger to top up the engine battery, as we have a solar panel it works very well, it keeps all the batteries charged when she is in storage. There is a great wealth of knowledge on this forum, i am sure there will be someone along shortly who will be able to give specific advice on your van. Link to comment Share on other sites More sharing options...
ClarkeKent Posted April 10, 2013 Author Share Posted April 10, 2013 Thank you. Link to comment Share on other sites More sharing options...
Philman Posted April 10, 2013 Share Posted April 10, 2013 On the Control Panel of my M/H there is a 3 position switch marked Cab - Off - Van. If the charger is switched on then, depending on the switch position, the associated battery will get charged. If the charger is not on then, depending on the switch position, the associated battery will supply all the 12 volt electrics. It is obviously unwise to use the starter battery to run the 12 volt electrics except in an emergency otherwise you may have a problem starting the engine. Phil. Link to comment Share on other sites More sharing options...
Rayjsj Posted April 10, 2013 Share Posted April 10, 2013 ClarkeKent - 2013-04-09 8:03 PM Hi I have a 2005 Lunar Roadstar 786 called Monty. I was wondering if anyone could advise me as to why the engine battery has gone flat whilst the motorhome was connected to the mains electricity. I thought being connected to a mains suppy would keep both batteries fully charged by the onboard charger.. Advice would be appreciated.. (?) Welcome to the Forum Cy, as has been said, Not all vans charge both batteries 'automatically', some do,others have a switch for a manual 'choice' of which battery gets charged. What does your Lunar handbook say ? (was there one with your van ?) and do you have a wiring diagram ? On my Autocruise, I used to have an 'Automatic' battery charger charging the vehicle battery, Plugged into a power socket in the van, AND the 'onboard' charger keeping the leisure battery topped up. My Autotrail 'appears' to keep both batteries charged, (and both have been ok through the winter). Ray Link to comment Share on other sites More sharing options...
Iain Strachan Posted April 10, 2013 Share Posted April 10, 2013 Cy, It could be that the battery, is dead, it is likely to be the original, you dont say how long you have had the van, or indeed how long its been sitting on hook up. I would suggest that you take the battery out and put it on a separate charger, depending on what kind it is check the levels in the cells and top up if needed. Once charged check the voltage, and see how it goes from there. By this time you should have found out about the charging set up in your van as per everyone elses posts. We try to use our van over the winter but even if we cant get away I still go to the storage yard and run up the engine, while I check for snow damage etc. PS dont try cryptonyte! Link to comment Share on other sites More sharing options...
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