I have a Pylontech US5000 battery and a Multiplus 2 GX inverter, without solar, one phase. I’m using the ESS Assistant to charge the battery at night when rates are cheaper, then use the battery during the day instead of the grid, because daytime rates are twice as high.
But here’s the issue:
When I’m running off the battery, there are moments where the dashboard shows negative values, meaning energy is being fed back to the grid. I’ve turned off every setting I could find related to feeding energy back, but it’s not helping. Could you please tell me what I might be doing wrong?
All firmware is actual, EU grid code in VEConfigure
But on installation dashboard i see “0 kw in grid”, cant someone explain thats ok or not? I dont need return energy in grid, my electricity meter doesnt support that
What you are seeing there is just a minimal spike, most likely caused by load change. The setpoint will never be perfectly 20W, depending on solar fluctuation and consumption you will most likely see values alternating between -50W to 90W, depending on your load characteristics.
But these don’t sum up to anything - so the dashboard is right with saying “0 to grid”.
From -50 to 90 W would not be bad. Sometimes there are spikes up to -200 W (screenshot from the “Power from grid” characteristics), which worries me the most. I have no sun, the load is small (sometimes with a load of 200 W, almost as much is fed into the grid). It’s very strange that this is happening.
Was the SoC at 99-100%, wenn this happened? From the “ripple” on the grid line, it could have been caused by the battery balancing. When The Pylontechs approach 100% and a single cell voltage raises above 3.5V, the BMS immediately switches to discharge “a split moment”.
If that discharge then is higher than your current consumption, it goes to grid as well.
(Then the bms switches to charging again, throttling the strongest cell(s), and as soon as another exceeds 3.5V, it starts over)
How is your multi connected? grid-parallel (i.e. just via acin) or do you run loads from acout?
When connected through ACIn only, another factor plays a role: When the multiplus is discharging, and the load drops, the grid meter HAS to go to -200, so that the multi is aware that it now can reduce it’s discharge by 200 Watts.
But don’t be worried about this, even if it would go to -1000 for a whole second - that would be 0.00027 kWh of energy, nothing to worry about.
