Multiplus 2 GX, 3.60 Release, DESS price forecast 11.06. Tibber Germany looks like this, bug?
I’ve checked your DESS settings, you have set the Price-Interval to 15 Minutes.
Tibber is not yet doing that, so it seems like all the prices of today and tomorrow (48 x 60 min) are squeezed into “today” and nothing left for tomorrow.
Change that setting to 60 min intervals and see, if that resolves the issue.
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I’ve been observing this same phenomenon for some time now, especially on weekends. I’ve always assumed that the VRM developers are working on a longer-term forecasting function. As soon as the actual data on the Abitur (high school graduation) is available, these linear forecasts disappear.
@Barbara
mentioned some time ago that they are doing tests on this topic
Great, thanks, that solved it.
Thought that 15 min pricing is now available, but you are right, has been postponed to september.
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Source? DE only or NL too?
Not sure:
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After changing the setting to 60 min yesterday, everything was fine. Now, with still 60, i see again a flat curve in tomorrows price graph.
Ideas?
Sorry, 30 Min later now ok.
@dognose
Hi @dognose , there has to be some kind of bug, now, at 12:12, i can see again a flat curve in prices for tomorrow. Screenshot:
EPEX prices for the next day are officially announced at 12:40 PM CET, but sometimes delayed upto 16:00 or even later.
I have the same, but I never payed attention what is displayed there BEFORE prices are officially published:
Victron is trying to extend the forecast period by providing an estimated price for the next few days and is experimenting with this on a small scale. So far, the forecasts only run as long as prices are available via the API. According to my information, these short-term prices are part of the experiment. As soon as the regular prices are published, these fictitious prices are immediately replaced. I’ve been observing this for several months.
I activated DESS last year a couple of months and deactivated it then, i never saw this before. Now, after reactivation, it seems like this is current behavior.
I think this affects calculation of bat/grid usage immediately, after the flat curve appears in the portal. Not good… what do you think?
Hi @dognose i checked the behavior today, it is how i thought, after the flat/wrong curve appears, DESS is calculating bat/grid etc usage based on that. This makes no sense.
What is also happening:
Target SOC 100, but discharging to grid, with -300 Watt grid due to high PV AC.
Not good.
@dognose When changing from 60 to 15 Min Interval, it looks much better. Flat changes to curved chart.
Where can I enlist (please pretty please, sugar on top!)
Here your battery is probably not able to take anymore power. Also seeing a discharge with some minor watts here indicates that your battery is currently doing cell-balancing.
Lot of BMS stay with a 99% SoC-Report until balancing is considered done, to make sure the system does not cut off charging because it receives a 100% SoC Value.
During balancing you will see the battery switching between charge and discharge in short intervals, that is completly normal.
Side-Node: You should look into integrating your PV into the system, so the actual PV-Power becomes “known”. DESS is doing a lot of “maths” to determine the best reactive strategy, without knowing the solar production on a system-level, unexpected behaviour may be the consequence.
How to do that depends on your inverter brand (some offer APIs that can be easily connected with the cerbo), others require a dedicated Meter configured as PV-Meter, for tiny inverters you may even use a shelly-device.