DadBodMarathonRunner
New Member
- Joined
- Jul 27, 2021
- Messages
- 8
My system consists of 400W of Renolgy solar panels, 280aH LifePO4 battery, EPEver MTTP charge controller, 3KW inverter and the 200A Daly BMS. All connections are secure and my balance wires are attached to the buss bars via tapped holes using screws. All grounds (2AWG) go to a buss bar and are attached to a hefty frame ground.
Everything seemed to have been working great over the last few months but last week I started noticing some odd behavior. At first the inverter would randomly fault for input voltage being low. This did not make any sense as the battery voltage never got below 3.2 volts per cell (12V system). Next, during the night all power got shut off. I found the BMS had shut down so I checked all connections and reset the BMS. Things worked for the rest of the night.
The next day it was faulting more regularly so I hooked up the laptop and did some datalogging (see attached). What I found was quite interesting. It almost looks like a buffer issue in the BMS. The BMS would get low voltage readings of 4V (2mV cell 1, 624mV cell 2, 2702mV cell 3 and 2201 cell 4). Temp readings seemed way off and the current reading went up to 2460 amps!!... yea, something seems off!! The load at the time was a only a few amps worth consisting of mostly USB charging. I bypassed the BMS and had zero issues. Any idea what is going on here??
Appreciate the help -
Everything seemed to have been working great over the last few months but last week I started noticing some odd behavior. At first the inverter would randomly fault for input voltage being low. This did not make any sense as the battery voltage never got below 3.2 volts per cell (12V system). Next, during the night all power got shut off. I found the BMS had shut down so I checked all connections and reset the BMS. Things worked for the rest of the night.
The next day it was faulting more regularly so I hooked up the laptop and did some datalogging (see attached). What I found was quite interesting. It almost looks like a buffer issue in the BMS. The BMS would get low voltage readings of 4V (2mV cell 1, 624mV cell 2, 2702mV cell 3 and 2201 cell 4). Temp readings seemed way off and the current reading went up to 2460 amps!!... yea, something seems off!! The load at the time was a only a few amps worth consisting of mostly USB charging. I bypassed the BMS and had zero issues. Any idea what is going on here??
Appreciate the help -