How to use separate battery bank in home ESS

DIY
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1

Hello,

I have a 12 volt DIY home ESS system that uses all Victron components except for the batteries which are 4x200Ah LiTime LiFePo4 in parallel. The system is centered around a 12/3000/120-50 Multiplus II with a Cerbo GX for the brain, measured with a Smart Shunt monitor, and controlled by a custom Python program I wrote. I have 2,500 watts of solar that feed the batteries through two SmartSolar MPPT controllers. The system is connected to the grid but I never feed power back into the grid.

To the point, I also have 2x270Ah Battleborn GC3 batteries for an RV that I store inside over the winter. My question is how can I integrate the Battleborn RV batteries into my home system while they’re stored inside. I was looking at the Victron battery balancer, but that appears to be for 24 volt and higher systems only and only addresses charging, not discharging. Any suggestions?

TIA

Jim

2

Since both the 200Ah LiTime batteries and the Battleborn GC3 batteries are 12V and LifePo4 ( same voltage and chemistry) you can connect them in parallel to your existing bank. And set the Smartshunt accordingly, add another 540Ah on top of your existing 800Ah.