jbatx
I make stuff with things
I checked in on my remote system just a minute ago and I was alarmed. One of the two 48v 16s overkill bms's reported some relatively huge current draw downs momentarily. ...and I dont know why. Hoping you all can plant some ideas.
One of the images is of the current chart for both batteries. The orange line is battery 1, which is the only one that spiked. 1 and 2 are parallel.
---System---
Two 16s 48v 100ah LiFePO4 banks with overkills bms's in parallel
Renogy 100a Rover scc
Xyz 5k inverter
5kw in pv from five 134v 9a strings.
----
The first draw spikes of about -40a were at around 6:30pm. The second of about -85a occurred at about 11:30pm.
Notice that battery 2 did not have a draw anywhere close. This was localized to battery 1.
The system is currently functioning.... According the the data flow. Voltage on both batteries is 53.22 currently.
Also, around 6:30, battery one had a large voltage fluctuation down to about 12v and up to about 75v.
For some context, all these data points are coming from the bms's over the serial port to esp32 devices that post to AWS.
Notice also that several of the cells in battery one are showing spikes up to 20v... just exactly 20v. I see this on occasion but never the many so close together.
Is there a short?
Is the bms failing?
Many screenshots attached.
Thanks in Advance.
One of the images is of the current chart for both batteries. The orange line is battery 1, which is the only one that spiked. 1 and 2 are parallel.
---System---
Two 16s 48v 100ah LiFePO4 banks with overkills bms's in parallel
Renogy 100a Rover scc
Xyz 5k inverter
5kw in pv from five 134v 9a strings.
----
The first draw spikes of about -40a were at around 6:30pm. The second of about -85a occurred at about 11:30pm.
Notice that battery 2 did not have a draw anywhere close. This was localized to battery 1.
The system is currently functioning.... According the the data flow. Voltage on both batteries is 53.22 currently.
Also, around 6:30, battery one had a large voltage fluctuation down to about 12v and up to about 75v.
For some context, all these data points are coming from the bms's over the serial port to esp32 devices that post to AWS.
Notice also that several of the cells in battery one are showing spikes up to 20v... just exactly 20v. I see this on occasion but never the many so close together.
Is there a short?
Is the bms failing?
Many screenshots attached.
Thanks in Advance.
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