Lifepower4 battery GS8048A inverter. BMS?

[tkauffman2]

Hello,

I have 6 Lifepower 4 batteries. Found here: https://signaturesolar.com/eg4-lifepowe ... 48v-100ah/
Using the GS8048A inverter with 2 FM80 charge controllers, FlexnetDC and Mate 3.

My question is if there was any way to directly connect the BMS from the batteries to the Inverter for precise SOC / Cell temp readings etc. ? I know some other inverters allow you to connect these batteries with a comms cable but I haven't found anything on this topic for the GS8048A.
Additionally I was curious if there is a way to program the mate3 to know I have Lithium batteries vs FLA - I'm getting alerts / error codes at 50% SOC when these lithium batteries are rated at 80% DOC (I can go to ~20% SOC before I need to charge them)

I have all the charge parameters set and the SOC% reading seems decently accurate but I still get nervous.

[raysun]

The Radian was designed prior to batteries having management systems and CANBUS communication.
I don't know how the Chinese BMS derive state of charge, but the FlexNET DC uses "current counting" - tracking charge and discharge current - to track SoC, and that's been shown to be the most accurate method. That being said, the FNDC has a built-in inaccuracy when tracking LFP batteries. It uses Peukerts law to derive net battery capacity, but employs a Peukert Constant of 1.15, the value for lead acid, rather than 1.05, the value for LFP. This will result in the SoC figure reading low during discharge. I have been tracking this for a couple of years, and the SoC reading tends low by 1%-1.5% when compared to a monitor with adjustable PC. The SoC value automatically synchronizes when the battery is fully charged.
With an internal and external method, the battery state should be able to be tracked with reasonable accuracy.

Additionally I was curious if there is a way to program the mate3 to know I have Lithium batteries vs FLA - I'm getting alerts / error codes at 50% SOC when these lithium batteries are rated at 80% DOC (I can go to ~20% SOC before I need to charge them)

The Mate3 is Lead Acid centric for the most part, but does accommodate LFP. The Low Battery Alert levels are configurable in the Mate, (IIRC, it's somewhere on the System menu tree.) However, the Mate front panel battery status LEDs (G-Y-R) are fixed to Lead Acid battery voltages, and won't really be useful for LFP. (I suggest what I used to do with the balky Check Engine light on my old Ford Fairlane - and cover the LEDs with some black electricians tape. ;)