DIY Victron Van Electrical System Questions

If you have any sort of knowledge about RV and campervan electrical systems I would appreciate your help. This is my setup and it's definitely not perfect. Thanks for your help!

[@cgroff5686]

You crushed it. I would put a cerbo gx in there to connect it all and utilize the VictronConnect and monitoring.

[@Johnobee1]

Since you mentioned Nate, he has wiring size and fuse calculators on his website. Never hurts to have oversized wiring. He may be willing to assist you if you reach out to him, he troubleshoots systems at rallies, etc.

[@jameswilliamson1312]

Can I recommend to everyone who is contemplating doing powerful setups, to get their hands on a thermal camera. You will be surprised how revealing they are. From low quality cables, to loose bolts and nuts, and even poorly crimped terminals.
For you system, try to let the heat out of that space to the left, where the fan will be blowing the air through the inverter.
From experience, shorten and transfer that inverter cable to the very right hand terminal of the right hand Lynx distributor. You'd like it as close to the shunt terminal as possible. Big cable next to big cable when you can. You have it going the whole length of those distributors in the current configuration. This will reduce the resistance as much as possible.
3000 watts divided by 13 volts (lithium based voltage) becomes 230 amps. Remove one of the 2/0 cables from the inverter to Lynx distributor. Run something powerful from the inverter, and check the cabling with a thermal camera. If there is a lot of heat after a minute, you need to check the bolt tightness and if no change, replace the removed cable. You may have lower quality cable installed and not know it.
Be aware that the colors on a thermal camera are a guide. Use the actual temperature numbers, to determine the difference between items of interest. There may be small changes in temperature relating to alarming color differences unnecessarily. It will depend on the camera calibrating itself on the fly as you use it.
Let me know if you want more help. This is a long post already.

[@williamkreth]

I was always told u should put switches on the negative side for large loads prevents arcing. Also larger the cable less voltage loss. Also its always wise to have in line fuses between batteries. Fuses are to protect the wire not the device typically