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Eg4 6500ex problems. No power?

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Bill Ding Homes

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Have 2 6500ex with 6 LiFePower batteries. I’ve had them hooked up and running off and on. Today, when i turned the solar panels on, neither one went into bypass mode. So I turned the batteries on, and switched the breakers for both inverters on and it sent the batteries into error mode. So I tried the 1st inverter only and it came on but anytime I try to flip the breaker for the 2nd inverter, it sends all 6 batteries into error. I’m baffled
 
Not sure if the 6500ex works the same as the 6000ex, but the startup process for the 6000ex is batteries first, then the inverter, then PV, then AC from the grid.
 
Bill Ding Homes said:
Have 2 6500ex with 6 LiFePower batteries. I’ve had them hooked up and running off and on. Today, when i turned the solar panels on, neither one went into bypass mode. So I turned the batteries on, and switched the breakers for both inverters on and it sent the batteries into error mode. So I tried the 1st inverter only and it came on but anytime I try to flip the breaker for the 2nd inverter, it sends all 6 batteries into error. I’m baffled
Click to expand...
So, you have had them running fine until this happened?
Also, did you get any error codes on any inverter?
 
I would recommend disconnecting the batteries from the 2nd inverter and testing the battery terminals on the inverter for continuity or a short.
 
EG4_Eric said:
I would recommend disconnecting the batteries from the 2nd inverter and testing the battery terminals on the inverter for continuity or a short.
Click to expand...
I tested and have continuity on the inverter. Maybe there is a problem with the breaker? When the first inverter is running, if I switch the breaker on for inverter 2, it. Shits the 1st one off
 
Seems like an internal problem on that 2nd inverter. I’m reading that there have been some issues with this
 
The EG4 LiFePower4 batteries have a built in pre-charge resistor.
Both inverters need to be OFF but all breakers/fuses between the inverters and the Battery bank (including and DC disconnect/Breaker in the inverter) need to be closed/on with the battery breakers OFF. When you close the breaker on the first LiFePower4 battery the BMS will initially use the pre-charge resister to apply power to the invert(s) to charge any inverter capacitors. Once the BMS has completed it's startup (SOC lights as appropriate, no alarm light and the run light slowly blinking) the pre-charge resistor will be removed from the circuit.
In other words any breakers between the battery input (including any DC/Battery breakers in the inverter) and the battery need to be closed before closing the breaker on the battery otherwise you will more than likely trip the BMS overcurrent shutdown.

"So I turned the batteries on, and switched the breakers for both inverters", which breakers?
 
Bill Ding Homes said:
Breakers between the battery bank and inverters
Click to expand...
If you switched these on "AFTER" the breaker on the front of the LifePower4 battery was on then there was no pre-charge resistor in the circuit, The initial current draw from the inverter as it "charges" it's capacitors can easily exceed the BMS Over Current Protection setpoint thus resulting in a BMS shutdown (and alarm).

The startup steps and process for inverters and batteries is very specific and "MUST" be followed (hopefully the inverter has these procedures) in order to prevent damage to equipment.

Generally all breakers (or fuses) between the battery and the inverter are closed/on (including inverter built in DC breakers/disconnects) and the inverter "On/Off switch is in the "OFF" position) prior to closing the breaker on the battery. Follow the inverter startup procedures.

Believe me, I have also violated the startup procedures and fortunately (so far) have not experienced the "magic smoke"
 
Based on the ohm reading and the battery error, it appears that the battery terminals might have been shorted. Typically, the reading for battery terminals should be between 1-3 kOhms. Please feel free to send me a private message so I can look into how I can assist you further, or you can also reach out to your distributor for additional assistance.
 
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