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i think ive sussed it now im changing over to lithium 280ah bat mppt mains 30 amp charger 12v dc2dc 50amp 500amp smart shunt all victron apart from battery
theres quite a lot to take into acount when doing this anyway this is what ive done so far disconected the 30 amp fuse from the green wire this stops engine charging my lithium battery then after some testing i found that when on mains
the battery stats to charge again through the bailey charger so i found that if i disconect the yellow and white plug it stops charging great but that plug needs to be connected when off grid so i used
a mains 12v psu only 2 amp and used a change over relay so when it detects mains yellow and white from charger go open circuit and at rest close again hopefully thats it thanks everybody
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View attachment 1033454
thanks very much for the info i probably went the long way round but got the same result in the end i had a fair bit of multimeter usage to find out what was going on first but yes you could have saved me hours of messing thanks but ive enjoyed it aswell learnt a fair bit toAll you needed to do was to leave the van wiring intact so the fridge still works on 12v while running , then where the 30 amp midi fuse is located (between the leisure battery positive terminal and consumer unit) , insert a 5 pin NC relay that will handle about 30 amps , pick up the green / pink D+ cable to switch the relay . This set up will disconnect your leisure battery from the old feeble split charge circuit (which is important with a big lithium) with the engine running allowing the exclusive charge control of the B2B. Then when engine is stopped ,your leisure battery will be reconnected to supply consumers and receive charging from on-board charger /solar etc . I can supply a diagram to clarify if required.