MrM1
I'm Here, But I'm Not All There
I saw something like this in a recent thread, but I think the OP said it had to do with charging and I did not want to hi jack the thread.
Here is the scenario,
- JK/Heltec 200 amp BMS with 2 amp Balancer
- Growatt 12kw off grid inverter
- 16s (x2) EVE 280 cells = 48v
- SOC is about 78%
- System mounted/Installed in a Cargo Trailer. Battery negative connected to trailer frame as well as AC ground
Fault:
System was working off grid at about 1500 watts
Trying to start a 3 Ton AC
Whole house goes dark
At first I thought it was the inverter Shutting down on an LVC (Low Voltage Cutoff)
But then when I went out and repeated the shut down I see I am getting this error from Both BMS's
Both the Same. So it is in the BMS
Here is what is Odd. As noted above, I have the whole system mounted in a Cargo Trailer. After discussing things with @FilterGuy I decided to ground the (-) Negative Battery Cable / Terminal AND the AC ground to the trailer frame. There is no earthing for this set up in the trailer, but earth ground does exist in the main panel outside the trailer that is being fed by the AC output of the inverter.
Here is what is Odd. 5 days ago, Before I grounded the Battery Negative to the trailer frame, I was able to start the 3 Ton AC. No problem. Now tonight every time it tries to start I get the above error. The system will start my 1 Ton AC, But not the 3 Ton AC. So I thought maybe the compressor was locked.
But here's the thing. I am getting 47v DC when I touch the Battery (+) positive and the trailer frame. AND ... I am getting 47v DC EVEN when I disconnect the battery negative from the frame (leaving the AC ground connected.
BUT WHAT'S REALLY WEIRD, I AM able to start the 3 Ton AC no problem with the Battery (-) Negative ground to the trailer disconnected.
Neither BMS throws the error. Any idea what is going on?
Here is the scenario,
- JK/Heltec 200 amp BMS with 2 amp Balancer
- Growatt 12kw off grid inverter
- 16s (x2) EVE 280 cells = 48v
- SOC is about 78%
- System mounted/Installed in a Cargo Trailer. Battery negative connected to trailer frame as well as AC ground
Fault:
System was working off grid at about 1500 watts
Trying to start a 3 Ton AC
Whole house goes dark
At first I thought it was the inverter Shutting down on an LVC (Low Voltage Cutoff)
But then when I went out and repeated the shut down I see I am getting this error from Both BMS's
Both the Same. So it is in the BMS
Here is what is Odd. As noted above, I have the whole system mounted in a Cargo Trailer. After discussing things with @FilterGuy I decided to ground the (-) Negative Battery Cable / Terminal AND the AC ground to the trailer frame. There is no earthing for this set up in the trailer, but earth ground does exist in the main panel outside the trailer that is being fed by the AC output of the inverter.
Here is what is Odd. 5 days ago, Before I grounded the Battery Negative to the trailer frame, I was able to start the 3 Ton AC. No problem. Now tonight every time it tries to start I get the above error. The system will start my 1 Ton AC, But not the 3 Ton AC. So I thought maybe the compressor was locked.
But here's the thing. I am getting 47v DC when I touch the Battery (+) positive and the trailer frame. AND ... I am getting 47v DC EVEN when I disconnect the battery negative from the frame (leaving the AC ground connected.
BUT WHAT'S REALLY WEIRD, I AM able to start the 3 Ton AC no problem with the Battery (-) Negative ground to the trailer disconnected.
Neither BMS throws the error. Any idea what is going on?