18Kpv unwanted (momentary) export to grid

If you don't mind sending me a DM with your serial number, I will take a look at this system.

Posted by: @caesarv

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2. I do have Fast Zero Export enabled as recommended, but am not sure what it actually does. There are no clear explanations of this setting.

Typically, the inverter adjusts its output power every 5 seconds to prevent export. When Fast Zero Export is activated, the control logic is enhanced to better prevent export, while the control speed for import is reduced.

Please keep the community updated as we're really interested in this topic.  Need to ensure zero export means zero.

I exported 13KWh with the no export setting on before I went off grid. I kept waiting on a call from my provider. I checked my settings numerous times and they were correct. I think it’s a glitch in the software. Probably happened over 20 days or so. Some days .3-.5 KWh other days next to nothing. 

@bobandroslyn While I understand your position,   It's actually physically impossible.

Any inverter that is connected to the grid and generating power.. will need to adapt to the load it's outputting. When a large load is being supported by the inverter and then shuts off, that inverter needs to react to that load change.  The reality is, that cannot be done instantaneously, and thus the power needs to go somewhere.  In a grid connected system,  that "somewhere" is the grid until the inverter can detect the change and react accordingly.

This is a result of how electricity flows, and the response times for an inverter to react.   

That said,  every electric utility in the country understands how these inverters work. There isn't a single utility in the country who cares about this occasional "leakage",  they only care about excessive and/or sustained leakage.  The instantaneous and transient spikes are not something they care about, because there is no way to avoid it, other than simply not having the grid connected.

At the end of the day, if an individual cares about these momentary leaks (even when the utility doesn't), there is only one way to prevent it.  Disconnect the inverter from the grid.  You'd need to find another way to support those loads if the solar/battery isn't enough to sustain it offgrid.  One solution that I've seen used, is to disconnect the A/C input on the inverter,  and connect a chargeverter (or multiple), set to charge the batteries from the grid when the SOC drops below a specific target.  This ensures that your inverters can draw power from the batteries, but not export to the grid..  and the batteries can be charged directly from the grid when there is a deficit of power from PV and battery.

Interesting post N2aws  I solved the problem by just disconnecting from the grid and no more problems.