@sailingolli

Yes, working now.

Coming back to your initial question, Lynx Smart BMS is really something to consider in a bigger system like yours because it has a contactor build in, which saves you lot of other safety equipment like a Cyrix for example. Of course, the VE.Bus BMS is also a alternative, but you can't compare them. The VE.Bus BMS is lacking the intelligence (smart, charging parameters included, perfect integration with your Cerbo GX etc.) compared to the Lynx Smart BMS

With such a big Lithium battery bank it also makes sense to consider charging the battery bank from your alternator (requires an external regulator and a modified alternator), which is way more efficient.
Then using the Orion-Tr smart charger to charge your starter battery from Lithium and also get rid of the Argo diode. That's how I'm doing it on my boat.

And FWIW, have you looked at the 330Ah SmartLithium? Two of them (or even three) is close to what you get capacity wise from your 4x200Ah, but requires less installation effort.

Hi Stefanie, That is awesome information and so helpful. I will certainly look at the larger capacity SmartLithium. Are there any other Smart Lithium Batteries with built in BMS which work well with the Victron system?

Stef

Have you heard of TN Power Lithium Batteries. I've been told by a renewables supplier in the UK that lots of people are buying them with Victron Inverters for boats. The product code I was given is TN-LFP12.8V216Ah. Do you think these will do? They are a lot cheaper than the Victron alternative?