Since Thor may own Hymer by end of year, this system that combines lead and lithium batteries may be of interest. The data is a little confusing — may be due to translation.
https://www.hymer.com/de/modelle/tec...ry-system.html
The obvious question to ask is why not go all lithium? It’s only a guess on my part, but I suppose it’s set up to keep initial basic cost low, with lithium as an option or upgrade. They also refer to lead battery as a back-up; which makes some sense for when lithium may not work at all. In those cases the AGM battery may keep controls functional. Not really sure what they are trying to accomplish in its entirety.
Picture below is from article, showing charging and discharging priorities:
Thor Forums
