3121rl solar question

[paulw]

Hello Everyone,
I just bought a 2021 3121rl legacy with "solar prep".2000 watt inverter
I have the PD4575 converter with the LIT switch charging option My question Is
Can I install 620 watts of solar and 2 100ah lithium batteries with the existing converter and factory wiring in the camper?
Thank you all for this great resource!!

[Foldbak]

You can install 200 AH lithium. Switch your converter from LA to Lithium. As far as exceeding 400 watts. I believe you're pre-wired for 600. Typically a rig with 400 watts is ready to upgrade to 600. You'll need a shunt and a controller. Victron is Keystones go to. What do you have currently? There are a lot of ways to achieve 600 watts.

[Daryles]

2019 solar prep was with 10 gauge wiring. The max current you can put through 10 gauge wire is 30A. I have four 200W panels wired 2S2P. This puts 42vdc @ 18A into my Victron 100/30 MPPT.
Yes I'm way over paneled for a 100/30. My next upgrade will be a 150/85 MPPT.
If I was doing it all again I would have installed unistrut rails, Renogy tilt mounting brackets and a 150/85.
Think about future expansion in your plans.

[paulw]

Hi
Thanks for the responses!!
Right now I just have the stock RV there’s no panels on the roof. There’s nothing in that charge controller hole except the joboni sticker. I have a sla battery installed
And a 2000 w inverter
Thanks!