kburndred
kim@burndred.com
Ben, I am encountering fault code 08 on my EG4-6000EX only since we added grid power. The inverter has been running fine for a week but now gets Fault 08 after we added grid power. If we determine that this is the cause what is the solution?Error 08 is encountered when BUS voltage is too high. Error 08 has several different things that cause this error code to appear. There are 3 different BUSes on these units, and each one could be the cause of the problem. You will want to start off by isolating the inputs of the inverter. Battery power is usually the best place to start here, as battery power is necessary for each of our inverters. Power on the inverter with JUST battery power connected, and see if the inverter throws the error 08. If it does, then you will want to check the BUS bar that your batteries are connected to. If your battery capacity exceeds the amp rating of the BUS bar, then this is likely what is causing your Error 08. If you’ve powered it on with battery, and the error did not appear, you will want to try powering it on with grid power and battery. The two main causes of the error 08 are BUS bars and grid power. If you start the inverter with grid power and battery and the inverter throws the error 08, then there are a few steps that you will want to take.
If the AC input and AC output have more than a 5v difference, this can cause an Error 08.
- Check to see if the AC input voltage is within 5v of the AC output.
If the input and output are looped (landing in the same subpanel) this can cause and Error 08. If the error 08 does not occur when you power on the inverter with battery and grid power, try adding PV to the mix. If the error 08 occurs once you add PV, you will want to see if the PV is landing in a subpanel with the AC input or output. If DC voltage is encountering AC voltage in a panel, then you can get an error 08.
- Determine if the AC input and AC output are in the same sub panel.
I saw grid voltage at 121 displayed on the inverter and the output voltage was displayed at 120. But the fault occurred some time after.
Could we use a UPS to stabilize the grid voltage? Power conditioner?
Thanks