Feedback please: 50A RV LiFePO4 Electrodacus system

[David S]

Hello all, two questions to start here. This is for a 37' RV with 50A service. Please note: this diagram and setup are still evolving. I've not listed things like wire sizes and max amps yet, nor have I posted a loads chart to go along with the diagram, ala @Dhowman .

That said:

1) Feedback on this v.1 layout:


2) Is there anything wrong with this bus bar setup for an Electrodacus rig. The two bus bars will be ¼" x 1 ½" and the two bars will be secured with an m12 with washers. It will be on the positive leg, per Electrodacus requirements:


Thanks!

 

[willo]

The bus bars look fine.

Your fuse values are out of spec.
The orion 24/12-70 delivers 70a on the 12v rail (at 13.2v from the factory) It'll want to be fused at 30-40a on the 24v side. (35a fuses are annoying to locate)
The 24/3000/70 Multiplus wants a much bigger fuse on the 24v rail. I used a 300A ANL fuse per the manual.
The SBMS0 wants to never disconnect from the shunts, so you should install those immediately off the battery terminals.

I use a contactor switch to combine L1 and L2 for inverter only/hybrid operation. In one position I can use a full 50a feed, in the second, they are combined and I can run in hybrid mode using my single multiplus inverter.

 

[David S]

The bus bars look fine.

Your fuse values are out of spec.
The orion 24/12-70 delivers 70a on the 12v rail (at 13.2v from the factory) It'll want to be fused at 30-40a on the 24v side. (35a fuses are annoying to locate)
The 24/3000/70 Multiplus wants a much bigger fuse on the 24v rail. I used a 300A ANL fuse per the manual.
The SBMS0 wants to never disconnect from the shunts, so you should install those immediately off the battery terminals.

I use a contactor switch to combine L1 and L2 for inverter only/hybrid operation. In one position I can use a full 50a feed, in the second, they are combined and I can run in hybrid mode using my single multiplus inverter.

Thanks for the feedback! I've seen the contactor switch arrangement and I'm intrigued. Planning for the biggest eventuality right now.

 

[willo]

FYI, I opted to buy some 35a self resetting breakers for the 24v side of my 24/12 converter.
My multiplus uses an ANL fuse in a housing, easy.

When I wired my inverter, I ran 3/6+10awg ground cable from my main panel to my inverter, mounted the combiner switch above that. If I were to add a second inverter, it would be an easy job to remove the combiner switch and wire it in.
You may want to terminate it into a junction box and then run more flexible 6awg to the switch if that's what you want.

And yeah, you'll end up making changes later.
My first round - add the multiplus and kill off my cheaper inverter
second round - adding a 12/24 charger to keep things topped up when towing on bad weather days, removed my old FLA 12v and isolated my break away trailer brakes to a dedicated SLA/charger combo. Adding the victron mulitplus control panel for inside and fixing a couple of my other mistakes. Easy enough.