Guru
Joined: 13/10/2014
Location: AustraliaPosts: 2232
| Posted: 10:14pm 13 Jan 2024 |
I find the variation in voltages between all various equipment really annoying, it's like ever manufacture is using a different reference, and when it comes to LFP batteries you need accuracy, and especially with cell voltages.
Interestingly, the DALY BMS current display is very accurate, at least on mine. I proved the HF noise on the DC bus from the Inverter is causing it to jump around though. However the DALY appears to consistently calculate the SOC within 1% or 2% of the JUNCTEK, providing the following does not happen.
The DALY SOC gets way off mark if the BMS starts tripping the Charge MOSFET on Cell over voltage, can happen when Active top balancing is in progress, the correct adjustment to Cell-OV settings fixes that, and obviously when the BMS switches the MOS at Pack OV, it sets the BMS SOC to 100%.
The connectors for the BMS Cell port and the Active balancer Cell port are a slightly different size, so much inconsistency, and as you noted, even the lead length is completely different and way to short, although I did not have to extend mine, I was able to change the Pack cell layout to accommodate.
Oh well, at least it all works in the end so that's a plus
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Edited 2024-01-14 08:15 by KeepIS