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.
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Tony & Donna
2022 Montana HC, 295RL, Solar Flex 400, Onan 3600 LPG, 2K inverter, 200AH Lithium. 2020 GMC Denali 2500 6.6 Duramax, Demco 21K Auto Slide
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