No Solar yet but would like to keep batteries topped up in storage

[FrankNicklin]

Most of that is inaccurate. No power is needed to the hab battery as the unit operates on voltage differential NOT any particular voltage. The transfer rate is 1.1A trickle but I'm not sure of the voltage differential. This link explains most....https://www.vanbitz.com/the-van-bitz-battery-master/

I wasn't clear when I said only work where there is charge to the leisure battery, but I did say if the leisure battery is not on charge it is not ideal as it will pull the LB down.

I was trying to say that the ideal set up is provide charge to the leisure battery to keep the setup topped up.

 

[Martist]

Maybe of interest, I've been measuring leisure battery voltage and engine battery voltage over the last 6 days. Two cases:
1. With no EHU connected and no loads on the leisure battery except for the Battery Master
2. EHU connected.
In case 1 as the voltage of the leisure battery fell, the engine battery followed by about 0.4 to 0.5V below it
In case 2 as the voltage of the leisure battery rose, the engine battery followed by about 0.4 to 0.5V below it
So I think that the voltage differential is around 0.4 to 0.5V

 

[68c]

Get an old car battery, charge it fully and connect to the van battery for an hour or so.