Configuring SOC monitoring via 12v battery internal BMS using Victron gear

[into_the_wild_mike]

Hello Guys, I

I am busy building and testing my system at home before I install it into my Camper. I picked up what appears to be a decent battery for a good price brand new on auction. Battery is rebranded version of the Poweroad PRLC-100.

I am trying to figure out best practice to have the battery BMS communicate and show an accurate SOC reading in the VRM (which i would assume will be more accurate and thus negate the need for an external shunt such as BMV712) with my Cerbo GX and rest of my devices (Multiplus, solar charger 100-50 and DC-DC orion XS)

See pictures and screenshots the manufacturer has sent to me which I am trying to make sense of -

They saying I have to make a custom cable "Wiring harness to be customized. One side RJ45 another side RJ11"

Can anyone help me make sense of what I need to do here? Would be grateful.

Michael

 

[sunshine_eggo]

Cut off 3" of RJ11 cable (grey)
Cut off 3" of RJ45 cable (yellow)
Take short RJ11 cable and take pins 4, 6 and 5 and wire them to pins 3, 8 and 7 of the long piece of RJ45.

In other words:

RJ11 pin 4 to RJ45 pin 3
RJ11 pin 6 to RJ45 pin 8
RJ11 pin 5 to RJ45 pin 7

 

[HRTKD]

I don't know your battery or your BMS. Many of the off-the-shelf batteries have BMS that aren't that great at tracking state of charge, especially when it comes to low amp loads. Consequently, the BMV-712 or SmartShunt may be a better solution if you want an accurate state of charge.