Dual Battery Setup - Sanity Check
 

Yet another dual battery system thread!

Looking to get a sanity check on my diagram (apologies for how poorly it's put together), see what you all think and if I'm missing anything. I still have to calculate all of the wire gauges. All I know so far is that I'll be using 2/0 to from house battery to the SafetyHub in the rear. Any crossing of cables in the diagram don't mean they'll be connected in any way, I just suck at making diagrams. For the SB connectors, I used a black line outlined in red to represent both the negative and positive cables.

I'll be using the Shrockworks Dual Battery kit for the house battery. The RELiON RB75 house battery fits in the tray, except the length is 10.2" when Shrockworks lists the maximum length that works for their tray as 10.1". I'm hoping I can squeeze it in.

One thing I'm not sure of is where I'm going to fit all of the Victron stuff in the engine bay in my 2018 4Runner.

https://i.imgur.com/i16lR8D.jpg

I'm putting together a similar-ish setup in my 100. I'm planning on running the ARB twin compressor through the second battery (and mine is much smaller than yours). The compressor doesn't pull enough juice for that to be a problem, IMO. The risk of depleting the starting battery is my primary concern. If the second battery gets drained, you just start the car or let solar charge it. If the starting battery dies and you've drained most your second battery, you might be stuck waiting a LOOONG time for solar to charge up enough to get it started.

That being said, the house battery you have listed is pricey. In my situation the second battery is cheaper than the starting battery so if I kill anything, I want it to be the house battery (36ah AGM). Maybe the huge price tag on your house battery is enough to shift priorities to avoid excessively draining that house battery.

2/0 cable to the rear? How do you intend to run this cable?