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Mystery solved. Been going back and forth with JBD in China and asked what the Current mR setting should be. I assume this is the shunt resistance. Was set at 2.5mR when in fact it should be .2 mR. All makes sense now. Sucks a bit as it needs to be plugged into UART box as not available over...

I contacted them via Ali Express and they were very responsive. Communications did get confused and while they were trying to help, we weren't getting anywhere. Just seemed to me that there was some sort of issue with the current/shunt. So I started looking at parameters and asked them about the...

I just went and purchased a DC amp clamp and some interesting results. Inverter with heatgun pulling 48amps. Check the positive lead to each battery and show 24amps. I have 3 x 8awg cables to an from BMS on negative side. All three in amp clamp and I see 24amps. Each one individually I see...

Fantastic driver. Installation was straightforward and plugged JBD-UART box- RPI with 5m extension and worked. Connected second battery to another USB port on RPI and can see both batteries. Brilliant. A couple of questions. 1. I can see that each battery is on a different USB port. Is there a...

Up until today I have been running Venus OS 2.73 and Serial Battery 0.9 on my Raspberry Pi and was able to see both of my JBD BMS's. Today I added some Ruuvi temp sensors to my system and had to update to Venus OS v2.80~44. After the update I can only see one of my BMS's. Tried updating to...

I have just finished putting together two 12V x 280AH LifeP04 battery packs using JBD-SP04S020 BMS's and the charge and discharge currents are way off. Paid the $10 for the Xiaxiang BMS app and run the idle, charge and discharge calibrations. Measurements changed but are way off. They are in...

Picture of my battery pack and a drawing of how they are connected. Lead lengths on each BMS are the same as is +ve cable to the +ve and -ve terminals. Have tried disconnecting one battery and calibrating idle, charge and discharge. Still a large difference between what Victron shunt and app are...

Ah yes, I have active balancer's which are the extra leads you can see in picture. I have disconnected them at the balancing board end.