I have 2 inverters HY5532 from Ouyad. Equivalent to Axpert VMIII

The 2 have the same problem. When Solar energy is fluctuating ( cloudy weather ) screen box is losing communication. ( error 32 ).

Inverter continues to work perfectly, but screenbox has to start up again each time. It takes each time a little minute. In stable weather it happens only a few times a day ( when sun rises or setting).

in changing weather it happens sometimes 10 times in an hour.

Is someone having experience with this is issue ?

U1 : 20 10

U2 : 02 70

Thank you in advance

HY5532VMIII _ (1).pdf HY5532VMIII _ (2).pdf

21 hours ago, Palawan said:

Is someone having experience with this is issue ?

I have no experience with use of these inverters.

But what it sounds like to me is that when there are clouds, there is a sudden drop of PV voltage, resulting in a sudden drop of bus voltage. At that time, the main power supply may "skip a beat" or ten. Other power supplies cope with this by having decent sized capacitors to "ride through" these periods, but the display, which relies on the "12 VAC" from the main power supply (often called HFPWR or similar, for high frequency power, may not be coping, as the capacitors are undersized, or perhaps dried out with age.

Has this problem been evident since new?

The Ouyads seem to be clones, and it's not clear whether the problem is the main power supply skipping too many beats, or the display not coping with the skips. Replacing the larger electrolytics in the display with decent quality parts may cure the problem. Unfortunately, there is no schematic for the display boards that I'm aware of, so it may be difficult choosing the right value capacitor, and/or making it fit.

This may be one area where clones are not as good as the original.

Check the capacitors on the SPS source output, and especially check if the LM7912 stabilizer is working within the parameters. Also check the insulation of the panels to ground, it is very possible that there are voltage leaks somewhere, measure + and - from the panels to ground disconnected from the inverter. This happens in rainy weather.

Thank you very much for your reply. The inverters are from end 2022 and 2023. So not old I think ...?

I have the impression the problem started when I replaced the screenboxes. The inverters were delivered without wifi. Then Ouyad send me 2 new boxes with wifi inside. In this case I thought it is not the correct firmware ?

I already changed the grounding of the PV panels support. These are now very well connected, but I didn't see impact on error frequency. Or is it better not to ground the support ( aluminium) to avoid leakage ? But then dangerous to have physical contact with the panels.