F23 Error
Hoping that someone has had the same problem and can advise...
A second inverter was added two a standalone system. Both inverters work perfect when working standalone, but when configured for parallel keeps om giving F23 error on older unit, and only at night. Works without issues during the day.
Sunsynk updated firmware MAIN1 and COMM. Support insists its not necessary for MAIN2 firmware to be the same.
System works perfect during the day, and only gives alarm at night.
Support suggested checking PV down to earth, which is fine. And even gives alarm when PV is isolated.
AC Mains also checked and in order.
Really hoping for some good advice on here as I am out of resolutions...
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Jacob,
Stating the obvious - I am sure you have configured the system to operate in parallel.
Are you getting the F23 code on both inverters?
The description of the F23 code is "AC leakage current is transient over current".
While a very common cause of leakage are the PV panels, this is DC leakage and the resolutions provided may apply to a PV issue, the description indicates it is "AC leakage current". Most mordern inverters will check/test both AC and DC leakage.
The Sunsynk inverter is a transformerless topology and one of the drawbacks is the presence of a leakage current between the physical earth of the grid and the parasitic capacitances of the photovoltaic module terminals and inverter components. During the day when there is PV available the problem of this type of leakage is less noticeable. You did indicate that the problem still exists when the the PV is isolated. This would suggest that when the inverters are connected in parallel that there a current loop is created between the 2 inverters allowing or causing the leakage current to flow between the inverters and creating the F23 error.
Gail indicated that on her installation the error is not present when the Grid is isolated. This also means that the normal load connected would also be powered off which is connected to the "Grid" port. This also means that the 2 inverters are now not connected in parallel via the grid, so there is no path for the leakage current to flow.
Have you checked that the inverters are "earthed" properly. This includes The PE connection for the ports connected and the inverter chassis.
Have you checked if there is any current present in the earth connections using a clamp meter when the error is being reported - There should be none (or if there is it is a very small value)
I hope this helps.