This video is mostly about wiring up a pair of Battle-Born LFP batteries, with a big Inverter. (This requires very large wires and fuses). He included a coulomb-counter battery monitor shunt, which is always needed with LFP batteries, and he also added a new PD "Power Converter" board section to charge the Battle-Born batteries at higher voltage.
This was everything you need in an LFP upgrade, much easier to watch than reading all the posts in my other Thread. His video does a great job at showing how to crimp ring terminals on to large wire segments; he used exactly the same hammer-down terminal crimper which I used.
I also "spammed" the video as a Solar Thread, because his project starts by adding pair of Renogy 100-watt glass-framed panels to the existing 80W panel, and upgrading the original factory-provided "PWM" type Solar Controller into a more efficient "MPPT" Solar Controller. But 70-80% of the video time involves the Lithium Upgrade and the Inverter, so it mostly belongs here.
I think it's a 2720, although it might be a bigger model. The video is beautifully narrated and photographed, very professional.
https://youtu.be/Y_AGOqHyff0