So I use Mode 2 to set the grid set point. Using it for several months. From time to time, the MultiPlus-II completely ignores the grid set point and acts erratically. It switches between Bulk (charging) and Discharging every few seconds, and sometimes shows "PassThru" in the GX interface.
Normally this rarely happens (once every few months). Or at least, I rarely notice it happens. But recently, I noticed this behavior twice on a single day.
In the morning, the custom control had the grid set point set at 2690W. I noticed that the grid set point was not reached at all. Even though the battery was not full or there was any other obvious cause for this behavior.
The MultiPlus-II was drawing 1000-1200W from the grid at that point. Far from the 2690W requested. I switched to Mode 1 by disabling the custom control. The MultiPlus-II did not "recover" even though the grid set point was now fixed at 2690W for quite a few minutes. I finally ended up taking some screenshots before resetting the MultiPlus-II through the GX menu. After all was back up, the MultiPlus-II behaved nicely again and I re-enabled the custom control.
A few hours later, I noticed the MultiPlus-II was behaving erratically again, seemingly doing its own thing, completely ignoring the grid set point. I again disabled the custom control and set the grid set point to 0W manually (in the GX device). To no avail.
In stead of resetting the MultiPlus-II, I decided to try something different this time. I shut down an electric fan heater (consuming approx. 500W) and low and behold, the MultiPlus-II started honoring the grid set point!
I am collecting some key metrics of the MultiPlus-II like input and output voltage, current, frequency, power. When storing these metrics however, they get averaged out over 10 seconds. So the quick charging/discharging behavior is lost in the process.
I am using a MultiPlus-II 48/5000/70-50, firmware version 494. Any idea if there is a known firmware bug on this?
If not, would it help the firmware development team having "debug" data every second?