Hello,
i have a very strange behavior ervery morning. When the price is low DESS start charging. In the next hour DESS start consumption from battery and one hour later it start charging again. This happens nearly every day.
Does anyone else have this problem?
My ID: c0619ab4bd42
Looking into the blue, I suggest double check your DESS battery settings. In particular “Maximum charge power” and “Maximum discharge power” who are used for SOC calculations. Try using a value which reflects an average or sustained charge rate. I assume this might help for your problem.
On the other side please provide more details of your system.
I was about to answer the same thing. The DESS calculates 1 hour of charging with the set power. After the full hour, it notices that it has more in the storage than calculated and releases the excess energy for consumption. A phenomenon that I have also observed.
I have set maximum charge power from 9 to 7kw but problem is the same.
Here my actual settings
System is 3x5000 with 17.5 kw pylontech battery
I had the same problem and couldn’t get it away. That’s why I switched off DESS again.
Perhaps our systems have similarities and we could narrow down the problem.
Can you provide a brief description of your system?
Number of WR
AC/DC connection
Type of battery
Battery connection
and so on.
My System is:
3x Multiplus 5000/48
5x Pylontech US3000
All Load (except Heat-Pump) on AC-Out 1 (critical Load)
Victron Lynx as DC distributor
Fronius Symo on AC-Out 1 (8kwp)
SmartSolar 150 (1kwp)
Grid meter VM-3P75CT
All firmware is up to date.
Wow, that’s a complete difference from my setup, I can’t recognize any connections, unfortunately.
I can’t believe that we’re the only ones experiencing this faulty behavior from the DESS.
Otherwise, a developer needs to take a look at our systems, but they’re being very hesitant at the moment.
I have almost the same setup, except for the charge and discharge rates. With these I tried many combinations, without success.
I also observe this at my system. Not always, but sometimes. After charging from grid, the battery is discharged in the following hour despite the prices remaining low. Following some examples.
VRM ID: b827eb273733
@dfaber Perhaps you could take a look at our systems in this regard? Thank you very much!
You can see your charge rate in the advanced view.
maximum charge rate is much higher than sustained charge rate.
I’ve already tried this for myself without success, even with charge and discharge rates below the maximum values, it didn’t help me.
In my opinion, this is a bug in the DESS and a developer has to take a look at it.
I had 5,2 kW max charge rate im the DESS settings, and this was also adhered consistently:
I therefore do not believe that the unwanted discharges after charging are due to the charge settings.
I also think so
This behavior again today: DESS originally planned to charge continuously for 3 hours. In reality, however, it was only charged for 2 hours, discharged from the battery for the following hour and then charged again for 1 hour…
But what I noticed: In the DESS settings, I entered 5.2 kW as the max. charge rate. This was also in the original DESS plan and the battery was actually charged with 5.2 kW (not much more is possible due to CCL 100 A):
However, approx. 5.8 kW was drawn from the grid:
This difference is certainly due to the AC/DC conversion losses: 5.2 / 5.8 = 90 %
The question I am now asking myself is whether the charging rate on the grid side (5.8 kW) should be entered in the DESS settings, or the power that actually goes into the battery (5.2 kW). Since the DESS is obviously planning with the value entered in the settings with regard to the grid usage, the grid-side value should probably be entered in the DESS settings. In my case, this means 5.8 kW on the grid side instead of 5.2 kW on the battery side.
What do you think? I’ll have to test it out…
maybe my glasses are not cleaned, but battery to consumption (dark blue) is ok for this hour,
then battery is charged again. If you do not want to use the battery and want to use energy directly from the grid (which makes more sense) you have to use @dognose HACK and set /Settings/DynamicEss/MaxTargetSocForIdle accordingly high or leave it at 100%.
This setting means:
if calculated (by DESS), use grid up to this SOC for consumption and keep battery idle
if I understood right
no, battery to consumption was not OK from 04:00 to 05:00, as the purchase price would have been cheaper during this period than the following hour:
This is why DESS originally planned to charge the battery from the grid from 04:00 to 05:00 instead of at 05:00 to 06:00:
In other words, the planning was OK, but the execution was not, in my opinion. It is inefficient to charge the battery from the grid, take the following hour from the battery and then charge the following hour back into the battery at higher prices. Especially if this results in charging at higher prices than discharging beforehand.
HACK is active and MaxTargetSocForIdle = 100 %
I had the same phenomenon the night before last, I think for the first time. Tonight everything was OK. No settings changed, nothing different than the night before
@Sarowe1990 Which charge rate shows your energy graph from 03:00 till 04:00, and which charge rate have you parameterized in DESS Settings?
