Switched out the batteries, cables and configuration, better?
I would personally move one of the fat cables to the other battery’s post to get a more distributed load across both. The wires are fine if you’re only running 12v devices off of them. If you’re inverting to run 110v devices, you should consider upgrading the wire gauge of the smaller connecting wires. At the end of the day, it’s all math.
Wow those are some wimpy paralleling cables.
You didn’t say what wattage the inverter is and what your anticipated load is. If it’s let’s say like my coffee maker (750w) that’s like 70A of load on the batteries with inverter losses. With your setup you’d see a huge voltage drop across those wires. I like to use equal sized wire to maximize the load the second battery can contribute to
I’ve also found on a lot of these batteries there can be significant voltage drop between a screw post and the main battery terminal. So I use only the main terminal for the heavy load stuff.
I would strongly encourage you to use owners forums where there is a lot more knowledge than this sub. You made some good fixes here but 12V DC is not to be messed with, and you’re going to get more reliable and expertly discussed feedback on owners forums than here in general. There’s plenty of pleasant discussion here but the more technical and hazardous stuff should be discussed on the owners forums for your rig.
