FoxESS Community - Owners & Installers Forum

Hi, I have just installed H3-10.0-SMART and 42kw battery with an existing PV system with 3 phase 10kw Fronius inverter.
I believe it is in AC coupling mode as no input to the PV inputs on the H3 inverter.
In the app I can see 0w generated by my PV, and negative power from home. Installer said PV is generating power and going into the battery (battery is full and exporting to grid).
Is it misconfiguration, or wrong wiring, or its the way it is, for the PV to read 0w for my system?

No that’s not configured correctly, firstly they should have fitted either a 3 phase meter (or CT’s) that measure the power flow at the supply meter and then they should fit a second CT to the output of your Fronius inverter, if they had you would be showing external PV being generated and the inverter would use it to charge the batteries.

Secondly from that screenshot you can see that it believes that the house load is negative, that’s because it doesn’t have the necessary meters to calculate the flow from your other inverter and so it see’s it as negative house load i.e. it cannot correctly calculate the house load and so all of your stats will be useless.

The only thing they said that’s true is that as your inverter believes you are exporting it will use that to charge the batteries.

I can see the nothing connected to the meter input, so is this mandatory?
What can I do about it?

1). The inverter must have either a meter or CT installed to work, otherwise it cannot load balance and the batteries won't be used.

2). With a second inverter you have to fit a second CT or the inverter will not be able to calculate the house load correctly and all of the stats will be wrong.

With 1) this is a must have, otherwise it won't work.

With 2) this is a should have, it will work but all of the statistics and information it provides will be wrong

The installer came and try to fix some other issues and I can see the meter.
No I was wrong, the meter is installed in a hidden location.
There are two sets of CT clamp installed, 2x3 clamps for three phase, total 6 clamps there.
One set is clamped to the incoming grid connection (from grid to switchboard), the other set is clamped to to the existing PV inverter output (from existing PV inverter to switchboard).
Is there a need for third set to measure home load? Or is the configuration is wrong?
Thanks.
This is the current screenshot

If you’ve got the 2 meters, each with 3 clamps that is everything you need, no need for a 3rd.

Your image doesn’t show any external PV which means the meter (and 3 CT’s) attached to the other inverter, either isn’t working (wiring issue, config, ID) or possibly the external PV clamps are fitted facing the wrong direction.

If meter2 was working, you would see External PV being reported and your house load would be correct.

You can check that the 2nd meter is enabled in your inverter settings, by going into Settings, Feature, Meter2/CT2 and it should be set up as a 3 phase meter (something like meter3p), it shouldn’t say ‘disabled’ or meter1p.

The meters are connected on a single pair bus see attached image. Each of the meters must have their settings made with the correct ID, the main meter (incoming supply meter) is ID 1, the external PV meter is ID 2.

Thanks Dave.
I only have one meter installed, but the direction of CT clamp (CT2) clamping existing PV inverter is pointing to switchboard (arrow pointing to switchboard), is this the culprit?
And is there any setting in the inverter to check this?

If CT2 is just a CT clamp you can check that is has been enabled as I mentioned before at the Inverter Panel in Settings(password=0,0,0,0), Feature, Meter2/CT2 set and it should say >CT<, if it doesn't, set it to that before you go any further.

It is possible the CT direction is wrong, the problem with the arrow is that if the cable has been wired incorrectly at the meter connector then the direction it is pointing doesn’t make sense, it’s also possible that the cable at the meter connector has broken a core (they are very fragile and often break when putting the connector together), or even the installer has wired it up to the wrong pins.

Assuming CT2 is enabled correctly, make a note of it’s current direction, unclip it and it will roll open, reverse it and re-clip it, wait 10 minutes and then check on your app to see if anything has changed.

Thanks Dave I will check it when the sun is up