During battery bank charging time from the grid, I often, but not always, see some Multiplus switch rapid transitions from Bulk to Passthru to Bulk again.
I have noticed this from my Node-Red dashboard control panel and, today, I took some snapshots of the readings.
When checking from the VRM advanced page in the ACin Voltage and Current widget, I noticed current fluctuations matching the exact time and minutes of the Dashboard panel displayed Multiplus state.
Since the voltage is fairly constant and the only load at night is from my 3 freezers, which never exceed the 300wh mark, I would exclude grid fluctuations, so I am seeking a technical explanation from the experts, as I am concerned.
I have checked all grig wiring connections for torque today, so I will report if that had a positive impact on the issue. Meanwhile, it is food for thought for those with some experience.
After a second investigation during the following night, I compared both AC1in and AC1out values and noticed the change of VE BUS switch state from Bulk to Passtrhu 02:52:44 back to Bulk 02:52:45, which coincides with a dip in AC1in 02:52 and an increase in AC1 out 02:52 (from 1.0A to 2.9A) suggesting an increased load, perhaps one of my freezers motor kicking in.
If this is the correct assumption, why shoud the VEbus decide to switch to Passtrhu for a split of a second if the passsthru is allready active from the moment that the AC1 is detected?
If the ACin current is limited to a low value, if a substantial load, compared to the AC Current, is used, the “passthru” message shows that some o most of the charging current has been redirected to such a load, hence the fluctuations in the images above.
Please correct me if this is the wrong assumption.
