Starting the motorhome Engine while on hookup

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the fact that you have no interlock is perhaps a sign that this is allowed and all is well, however, I would suggest trying to avoid in future.

Perhaps the lack of an interlock maybe so. Nevertheless I do agree with you HG, it is not something to continually do. I question if I have done it a handful of times over the years, it is not normally in my routines to do so.

peedee

They reckon when staring a car the starter motor can draw up to 200 amps which would possible be no problem with fully charged vehicle battery when connected to the mains but when the battery is flat its a bit much for the poor the charger and of course the leisure battery is only designed  to give out low current, in fact i've just replaced one of the rectifier bridge diodes on a small 230 volt AC/12 DC volt power supply we use in the caravan for awning lights and blowing up the  tyres it had been burnt out due to being overloaded thus causing a power surge, so it won't be loaned out again 

Thanks for all your help, l have taken the motorhome out, doesn't seem to have caused any problems but will keep a close eye on it. My motorhome is Autotrail Tribute 625 2015, this Monday l am having a door fly screen fitted by my Autotrail dealership, l will ask them to do a drop test on the batteries, its five years old this September not sure how long motorhome batteries last, l had one thought it has a tracker fitted but didn't sign up to it has we keep the Motorhome at home, l have heard they can deplete the power in the battery, l had this issue on a caravan l had, they used to ring me up at all hours saying the caravan alarm had gone off due to battery discharge, not sure if this could be the problem. Was thinking of investing in a power pack but the ones l have seen are around £170, may be best go to go to the top level on green flag. Once again thank you for all your input.

Heethers

My van is stored at a CAMC storage site and I regularly log onto the van via a Swift app on my phone to check that the solar panels are working and charging both batteries.    During November I logged on and noticed my vehicle battery was not been charged but Habitation battery was.   I then rang Sergeant Electrics who are contracted by Swift to install all of their electrical equipment and they logged onto my van and said I was right.    They explained that there is a Smart Meter in the PSU and if switched on will charge each battery for 4 hours alternatively, however, this meter was switched off.   He switched it back on and charging of both batteries resumed.    I remembered that I blew a fuse during October and had my dealer check the electrics to see why the fuse blew.   The dealer checked everything and couldn’t find anything wrong, but he did pull out the PSU to check behind and must have accidentally switched the meter off.    I didn’t mind this experience because I learned a lot about how the PSU and battery charger work and charge my batteries.

BillC