Hi Danny
Thanks for that, your video is very interesting. I also found quite a bit of helpful information for a canal boat setup on the Canalworld forum, e.g.
https://www.canalworld.net/forums/index.php?/topic/99667-another-lithium-battery-thread/page/9/
There's been loads of discussion on various threads on the use of lithium batteries on canal boats. None have however really looked at an affordable way to do ie get the benefit of lithiums but at a realistic cost. We've now had LiFePo's on our boat for 3 months and so I now understand them....so...
www.canalworld.net
and there is also another interesting article here:
Electrical design considerations for the integration of lithium battery systems on board marine installations.
nordkyndesign.com
It looks as though some people think it's actually safer to keep at least one SLA in parallel with the lithium batteries, as a safeguard for the rest of the system (especially the alternator) if the lithium batteries are automatically disconnected perhaps because of an over-voltage situation, and as in my idea, just to provide some extra capacity. I didn't quite gather why you don't like the direct parallel connection? But in any case I guess that in your system, the alternator is connected directly to the SLA bank only, with the lithiums charged by the Sterling B2B, so disconnecting the lithiums wouldn't damage anything else.
Regards
Nigel