The data (from the inverter) is uploaded every 5 minutes, which is essentially a snapshot of the data at that instant (random - even while a transient is happening, this is the problem). The other point which makes this a problem is that the inverter takes a few seconds to ramp back the grid power (it sees that you are exporting, and then in 2 or 3 seconds it starts charging to cancel out that export).
To put this all in an example (solar power is 0W, as to make it simple):
- you turn on a kettle (t=0s);
- in one second time, the inverter gets the message from the meter that the house is importing 3kW(t=1s, if monitoring takes a snapshot here (randomly), it looks like your system is not doing anything...but that was just an unlucky snapshot :D );
- the inverter takes 1 second (t=2s) to ramp the discharge power to 3kW (if there is energy in battery), which results in 0W at meter connection (good time for a snapshot).
There is another instance of a bad snapshot time, when the water (in the kettle) finishes boiling:
- the kettle stops using power (t=0s), while the battery is still discharging at 3kW, this results in exporting 3kW;
- the meter detects this export (t=1s, this is an example of a bad snapshot because you are discharging precious battery energy into the grid) and communicates to the inverter;
- the inverter takes 1 second to ramp back the discharge (t=2s), meter power is back to 0W
Was this article helpful?
That’s Great!
Thank you for your feedback
Sorry! We couldn't be helpful
Thank you for your feedback
Feedback sent
We appreciate your effort and will try to fix the article