This happens every day, but I'm now posting a bug so you can look at really any date.. The issue is the following: there is ample solar power, the viltron charger connected to the battery buis charges as expected (prices at lowest, battery SOC low) but the energy from the AC side solar is completely dumped into the net. This happens every day. If I look at the schematic overview menu, I see that the system is not able to calculate that the AC side is generating power. In my opinion, it should be able to figure out that energy cannot occur out of thin air. To be more precise: I have 5 kW going into the grid, I have ~0 kW going into the viltron ESS from AC and I have ~700 W going to the critical loads. This does not add up. The issue is that the system limits the numerical value of the AC side loads to 0, it apparently does not allow this number to go negative. This then leads to erroneous predictions and calculated values. As a consequence, in DESS mode the energy is not used.
And when I turn DESS off (and use the setpoint export 50 W:
Contact Details
mark.frencken67@gmail.com
VRM portal ID
c0619ab33bfa
Country / region
Netherlands (nl)
B max
45
TB max
7
FB max
9
TG max
28
FG max
28
Battery costs
0.01
Buy price
(p+0.02+0.13)*1.21
Sell price
(p+0.02+0.13)*1.21
feed-in possible
None
feed-in control
None
What happened?
This happens every day, but I'm now posting a bug so you can look at really any date.. The issue is the following: there is ample solar power, the viltron charger connected to the battery buis charges as expected (prices at lowest, battery SOC low) but the energy from the AC side solar is completely dumped into the net. This happens every day. If I look at the schematic overview menu, I see that the system is not able to calculate that the AC side is generating power. In my opinion, it should be able to figure out that energy cannot occur out of thin air. To be more precise: I have 5 kW going into the grid, I have ~0 kW going into the viltron ESS from AC and I have ~700 W going to the critical loads. This does not add up. The issue is that the system limits the numerical value of the AC side loads to 0, it apparently does not allow this number to go negative. This then leads to erroneous predictions and calculated values. As a consequence, in DESS mode the energy is not used.
And when I turn DESS off (and use the setpoint export 50 W:
When did it happen?
11/08/2025 11:00
Screenshots