Dual Battery Fuse/Breaker Layout

So I'm in progress on doing electrical work and wanted to get a sanity check. Here's what I'm planning to do when everything is said and done, please don't judge me this took roughly 200 hours in MS Paint:



The green boxes are circuit breakers and brown are MRBF terminal fuses. I'm not sure entirely about the orientation of the breakers. Since I'm planning on using the SBI-12D isolator the current can flow both ways, and therefore I'm guessing that the position of the breaker studs are important. For this breaker

$32 Bussmann CB285-100 Surface-Mount Circuit Breakers, 100 Amps (1 per pack)

https://www.amazon.com/dp/B01G2JMEUQ there is an AUX side and a BATT side. Would it be correct to have the AUX side wired to the battery terminal, and the BATT side wired to the isolator?

And it would follow that a 150A breaker for the SP 9100 would have the AUX side wired to the SP positive post and the BATT side wired directly to the house battery positive terminal.

Finally, can I have all the negative leads attached to the negative bus and then have one wire going to the negative post of the main battery? Or is it better to have separate leads for the various components?

Thanks all

 

Yes isolators should be in the correct orientation.
I don’t know your loads so can’t comment on the sizing.
Be sure to add up all your loads to calculate the size of the negative.

 

You are missing the generator power input...in the drawing.

Also:


Why do you have an additional isolator?

 

The alternator is part of this, I just didn't include a direct connection in the diagram. The SBI-12D is for a manual override to link the two batteries together in case of a dead starter.

 

SP 9100 breaker should be lower:

 

I've also seen that the SP 9100 has internal MOSFET protections so it might not even need a breaker. I'd even be fine carrying a spare 125A fuse for the power cable