Lithium Battery Upgrade on Rockwood 2109s

[JWCHarris]

I have a 2023 Rockwood MiniLite 2109s with 200w solar on the roof and got a Renogy 200w solar to plug onto the solar port on the side. I want to replace the AGM battery with a 100Ahr Reogy mini core lithium now and another in parallel in the future. Without replacing the PWM controller and extensive rewiring I have come up with the configuration in the attached. Any helpful advise would be appreciated.

 

[jimmarako]

If you are not moving the battery inside or something then why not just reuse the existing wiring as is? You already have the disconnect switch and a resettable fuse on the 12V line. Otherwise your picture suggest a lot of re-wiring is being done.
If you go with your plan I'm not sure you need the terminal fuse followed by the T fuse. I'd stick with one or the other. 1/0 wire is a little small to protect with a 200A fuse.

 

[Aussieguy]

Unless you going to use a big inverter you don’t need any wiring changes

Battery won’t fry your wires… it only sends as much power as the loads require

Then if you do add inverter you just size the wires between inverter and battery correctly. It is a different circuit so you add the fuse and bigger wires between inverter and battery ….. at the time you add the inverter.

 

[JWCHarris]

If you are not moving the battery inside or something then why not just reuse the existing wiring as is? You already have the disconnect switch and a resettable fuse on the 12V line. Otherwise your picture suggest a lot of re-wiring is being done.
If you go with your plan I'm not sure you need the terminal fuse followed by the T fuse. I'd stick with one or the other. 1/0 wire is a little small to protect with a 200A fuse.

The thought for the 200A T-fuse was as a provision for a second 100Ahr battery in the near future to protect a totL 200Ahr and maybe with an upgraded inverter