Please check my wiring for new lithium battery

[mrmjd]

Hi there! My newly acquired van has a dead leisure battery, so I was thinking about replacing it with a nice Fogstar lithium option. But I need to be sure of the wiring and components...

The relevant components I already have are:
CTEK D250SE charger, which *should* be able to charge lithium, I think: D250SE
An MPPT solar controller which *can* do lithium, but might need programming. But might be redundant since the D250SE can be a solar controller? 12V solar panels charging kits for caravans, motorhomes, boats, yachts, marine
A mains charger for hookup, which doesn't do lithium: 12V solar panels charging kits for caravans, motorhomes, boats, yachts, marine
A Renogy inverter, which should be fine: 2000W 12V Pure Sine Wave Inverter With English Standard Socket (with UPS Function)

Here's a simplified diagram of the current wiring (I think), skipping all the earths:



So.. should the solar panel feed go directly to the D250SE, since that already contains a controller for it?

And could the mains charger go to the 'vehicle' side of the D250SE, allowing the D250SE to be the only controller in charge of the lithium battery?
This is what I propose for the lithium setup:



Any tips and observations would be very welcome!
Kind regards
-Mat

 

[Bigsidavies]

From personal experience:- keep the seperate MPPT controller. It's all connected up so why make life difficult. Also, it gives you some redundancy should your CTEK fail as mine did last year in Spain. I then had no means of charging without being on EHU. Also, the CTEK is 20A max combined, whereas with just a 100w panel and the CTEK you could get 26A.

You can use the 250se with LiFePo. It's selected by placement of the little black battery selector wire on +12v. I have mine connected to the alternator input of the CTEK

Not sure about the DC-DC being connected into the CTEK but someone who understands these things will confirm. Seems like a bad idea to me. How often do you use EHU? We never use it (except when the CTEK failed).