Mine trips with no load as well.
I’m confident the AC300 is acting like a CFGI breaker and sees too many paths to ground when it switches… the more I read about it, the more I think it’s actually doing the right thing.
This article, I think this explains it.
I read somewhere along the line they had some kind of update for their panel to rewire the neutrals… have you asked support about it?
Your issue will be resolved once the new firmware is released.
That’s not possible… It’s a physical issue.
Yes it’s a physical issue. Bonded vs unbounded neutrals. I don’t think there is really anything more to figure out. Support told me it won’t be fixable in firmware. (I’m not talking about the Bluetti panel which may have different solution.)
Hello: Reading over all the threads on the AC300 & transfer box problems.
I have (2) AC300’s. I want to do the 240V split phase setup. I will only be charging my AC300’s with solar and NOT from the grid or any kind of power from the electric company.
I am wondering if my transfer box will work with this setup.
My transfer box is a "Connecticut Electric 6-7501 manual 7500 watt, 30 amp transfer switch.
It only has the one neutral line. But after reading about all the problems, it seems they come about having the AC300 plugged into the wall & using grid electricity to also charge the AC300?
If I only have solar panel charging, would I be able to use this transfer switch or most any transfer switch?
Yes - I rewired the neutrals on the switch per the new schematics (which cleared some issues), but the AC300’s still turn the ac off when the power comes back on (zero load or full load).
@recycle - let me provide more context here. When your system is connected to the grid your AC300 will match the grid phases… this means that your Master will match the Leg it’s connected to and the Slave will match the other leg. This takes a moment for the system to do and thus is why when grid power is restored the ac300 will need to do a checksum before allowing grid power.
Wow, so if this problem exists on their switch, it clearly is a design oversight. Are you getting any feedback from support?
No reply from support yet. Sent the request early last week.
It makes sense Twister36, but it still happens when I only use one AC300 in single phase on one side of the panel. So it shouldn’t have to recalibrate for the phase.
Coz - This switch is pretty much the same as the Pro/Tran models. It was designed for “emergency” backup power when your grid power is down. It was not designed to run in parallel with your grid power being active.
That one neutral line coming from the transfer switch is probably from your inlet going back to the main panel.
At this time we only know that the use of these non-switched neutral transfer switches causes the AC300 to die with a 008 error message when they are plugged into the grid. However I can’t speak to the other issues it may be causing by mixing two active power sources’ neutral systems together on your other devices in your home.
If it was me, I wouldn’t use it.
Hi Amok… actually yes it still has to do it with a single ac300… because of grid pass-through. In order for the system to pass the incoming grid power and merge it with the inverter power it needs to sync the two.
So a transfer switch that switches neutral fixes the issue with AC300s dying but doesn’t solve the issue of the inverter’s AC output being shutoff when grid power is restored even when only one AC300 is in play?
No the neutral switching fixes the AC shutting off when grid power comes back on.
The issue of the AC300 dying (“008 OCP Error”) I’ve actually never experienced – I believe that was a bug introduced somewhat recently that has subsequently been fixed in a firmware update.
ugh… I’m beating a dead horse here. The 008 error is directly related to the transfer switch. You must have switched neutral. The 008 error can be caused by other circumstances, but the primary reason is the transfer switch and a alternative path for your circuit to complete through the charging outlet.
The AC turning off will when grid power is taken away will be resolved in the next firmware…
The AC turning off when grid power is restored is by design.
I have never received an 008 error, even with dozens and dozens of tests with my transfer switch. I do not have switched neutral.
My AC does not turn off when grid power is taken away, connected to transfer switch or not.
The AC turning off when grid power restored “is by design” has only recently been reported by support. When this thread started months ago all they said was “Sorry”, “Don’t worry”, “We’re researching the issue”. Then they went silent here.
My experience is the same as Recycle.
I only experienced the 008 (ac300 popped and died) only after they sent me a new ac300 replacement as they wanted my original ac300 for analysis. I never experienced 008 on my original ac300s. I also never had the ac output turned off when power was taken away. Ac output turned off only when power was restored.
Twister36, when ac output turned off after power was restored, did you receive a high voltage alarm which must be cleared before it will let you restart the ac output?
Recycle: What transfer switch are you using?
Are you running one or two AC300 units?
thanks
coz
