Mikkie

It seems those two blue CTs are replaced in mine with a single VAC CT. See 3rd image below. The second image is just to show the lay of the land. There is only one other CT component and it is a daughter PCB mounted vertically as shown in 1st photo. I see both live and neutral wires going through that CT. I am thinking that this would probably measure the current difference between the two wires where in the perfect world, the neutral will be exactly opposite of the live wire.

Hi, you sure know these inverters. It indeed has an HXN-20P (manufacturer LEM) current sensor, reference designator HCT3. Some pictures attached. From what I can gather, it seems to be connected to the PV input. If that is the case, it really should not be providing an output with no PV connected. Oh, I would offer some body parts for a schematic... Will try and find a replacement. I see Denver Technical Products Ltd is the agents for LEM.

What do you think about that VDE setting?

Thanks for the additional clarification. Just for the record, looking at the HY3k service manual, error 08 has a different meaning. It states that the problem is "DC current sensor fail". I took the front cover off, the unit looks fantastic inside, clean, no leaking caps, no (obvious) blown components and exactly like the Infini photos in the manual. I have an oscilloscope, probes at about 300V max. But I do not have circuit diagrams or assembly overlays, so a bit in the dark when it comes to measuring locations. The error appears before any load is connected. The system is simply turned on with the addition of power.

So quite a few days later and the 08 error is still present. I did notice that I can in fact turn the unit "on" meaning it will switch the relay to connect the load to mains, sometimes it stays on like this for long time, other times it disconnects after a while. I connected my PC with the solarpower software to both my units and noticed that the working unit has the regultion set to VDE4105 and the not working one is set to some other VDE???. I tried to change it but I get the famous factory password request. What should the inverter be set to and could this be the cause of the problem? Anybody know where and what is measured to get this error? Which output current? "DC component in the output current exceeds the upper threshold"

Just a quick report back: With just the batteries connected, the unit shuts down after few seconds. So I powered up the unit with mains, then it remains on, still giving the error 08. I will leave it likes this to see if it clears the fault.

Thanks for the more detailed explanation. I will leave the inverter on with only battery power supply. Will report back in a day or two.

Yes, it's been sitting idle in the box. "Perhaps some of your electrolytic capacitors need reforming" --> Never heard of this before. can you please explain a bit more? Do you mean to disconnect the PV, Battery and only leave it on mains? Ivor

I have two of these inverters, with only one installed. Its been running close on 3 years without a glitch. Got connected to that one 9x 250W panels, 20x120Ah SLA configured for 48V. Installed a further 10x320W panels and also the other inverter. After connecting the solar panels and batteries, the inverter is giving error code 08. According to the manual it is " DC component in the output current exceeds the upper threshold" I have no load connected to the inverter. Any ideas on what the problem could be or who I can contact? My inverters are Growatt brand.