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On our Elddis CV40 the Truma dual solar controller is only connected to the leisure battery, I have fitted another matching Yuasa 95 amp AGM battery to give me a bit extra. The 100 watt solar panel is seeming to cope keeping them charged. There is another output on the controller which the manual says is Battery2 (starter battery) which isn't connected. In fact the solar charging & mains charging only charge the leisure battery, the problem I have is if I don't run the engine the engine battery will slowly discharge when not being used. I was wondering that if I fitted a cable I can disconnect from the Battery2 output to the engine battery would this be a problem, would it matter if the engine battery isn't an AGM type (the controller is set for AGM. On the controller it can be set for how the power is split between the 2 batteries so I was thinking of having 90% to the leisure batteries & 10% to the engine battery. I can easily make a cable that I could unplug when I'm using the van on a regular basis, I'm only thinking of the times where the van might be left standing for a while.