Hello,
I’m currently experimenting with Dyn ESS, but I haven’t got it working the way I want yet.
The aim is to discharge the battery into the grid via an MP2 at, for example, 2 kW, but only during a specific period, e.g. 18:00–22:00. What’s the easiest way to do this?
I’d like to use the system in a more grid-friendly way.
Thanks
Simply control the feed-in accordingly via Node-RED.
dynESS is actually for charging the battery (when electricity from the grid is cheap).
To discharge it, you don’t need DynDSS… just a timer.
and without Node-RED?
dyn-ESS also has a trading mode, so it can feed power into the grid as well.
Buy cheap, sell high.
That’s exactly what I’m looking for—a timer 
But don’t forget the roughly 25% losses during charging/discharging…
And when I look at today’s prices … is it even worth it?
I have a fixed tariff of 24.05 ct/kWh … so I don’t need to think twice…
especially as I achieve > 95% self-sufficiency in summer.
As I said, I don’t want to trade—meaning I’m not going to draw electricity from the grid and then sell it back to the grid.
Instead, I want to feed the solar energy I charged during the day back into the grid in the evening, in a way that benefits the grid.
Apparently, some people don’t think only about money
You wrote it yourself, after all : buy cheap and sell dear ;O)))
That was the description of Trading mode.
Just have a look at my first question; it explains what I want to do.
I won’t be able to avoid Node-RED, as scheduled discharging is currently not supported in Normal mode—or I just haven’t found the option yet.
It can be achieved to some extent with dynESS, but I’m still seeing erratic discharges. I already have a suspicion about what is causing it (not Victron).
That takes care of it.
Just use another system that you can control it with. Node-RED is part of it; otherwise, it won’t work using the built-in tools.
Hi,
All credit to your motivation, but a quick note on the legal situation first: If you receive EEG remuneration, you must NOT discharge from the battery into the grid — not even if you previously stored pure solar power.
The Bundesnetzagentur is very clear that electricity that has been stored and then discharged again can no longer be considered EEG-eligible solar power.
In the absolute worst case, your grid operator could accuse you of subsidy fraud and revoke your feed-in tariff (including retrospectively).
Just providing this as neutral information.
You can use DESS for these purposes. The settings you would need are roughly as follows:
DESS should then calculate how much battery capacity you need until the following morning and sell the surplus between 6 p.m. and 10 p.m.
However, you need to “play around” here — if you suggest too high a profit, DESS will conclude that it is worthwhile selling EVERYTHING and buying it back from the grid at night — which is not what you want.
DESS would then also calculate when it is worth buying cheaply — if you want to prevent this, simply tell it that you always pay two euros per kWh when buying electricity, and it will never consider that an option 
Hi,
Many thanks for the valuable information.
I’m only planning at this stage and wanted to test whether it works, so that I’m prepared as soon as this becomes officially possible. It’s currently being discussed because of grid-supportive behaviour. Although, with our new government in Germany, I rather suspect that they want to make things more difficult for us PV operators than help us. What was that quote from Ms Reiche about worsening the business case for renewables because expansion isn’t aligned with the grid? Grid-supportive behaviour from everyone—for example, Victron systems—would help to some extent here.
That could also cost Victron a considerable amount of revenue if Ms Reiche gets her way.
I had imagined the DESS settings exactly as you describe them, but, as you say, you have to experiment with them a bit. I had still set the difference too low in my calculations.
Best regards to a great support team!
So from my point of view, this is clearly a use case that needs to work in the medium term.
Excuse me, but it’s 2025 
. The Solar Peak Act. Nobody wants to see my electricity in the grid any more between 12:00 and 14:00, and people are tripping over themselves to come up with rules for throttling my generation, controlling my system or scrapping the 7-cent EEG payment at midday.
My nearly 20 kWp system will be connected to the grid in August, so I’m massively affected by all this regulatory fuss. I’ve now bought a Fronius Smart Meter in addition to the Victron SmartMeter for the Cerbo, because otherwise the electrician would have immediately throttled the Fronius inverters to 60% of their generation capacity — despite an ImSys already being in place. So much for self-consumption systems not being affected; that would be far too simple.
So, with storage prices falling, it makes perfect sense to explore the option of 100+ kWh of storage and subsequently shifting the feed-in of my own PV electricity through direct marketing (e.g. Luox). Even in summer, there are time windows every day when electricity costs 10–15p per kWh on the exchange, usually sometime between 18:00 and 22:00.
Without even knowing it, I had already expected that you could somehow create a simple timer table in the Victron ESS — something along the lines of: “Dear three MP2 10,000s, please discharge continuously at 20 kW from 19:00 to 21:00 on Thursday.”
Hopefully, the fact that it’s currently (still?) not permitted to discharge storage into the grid will change quickly. In direct marketing, the EEG is no longer relevant anyway, except in the form of the “market premium”, which provides a floor for the sale price. It would be good to know whether and how you can waive this; I think I’ll contact the direct marketer today. If you control things yourself so that your sale price is above 7 cents, this market premium would be zero anyway, so it wouldn’t matter if it were subsequently removed or withdrawn retrospectively.
I do it so that I always set the feed-in power to a proportion of the current PV output, depending on the SOC: feed-in power = SOC/100 × PV output. When the battery is fairly empty, only a small proportion is fed in; when it’s full, everything is fed in. This way, feed-in starts in the morning and, by midday—when I stop exporting—there’s room in the battery. After 3 p.m., I resume feeding in according to the same scheme. So the battery is practically never used for exporting. The Grid Setpoint is controlled via Node-RED. It works well, and I don’t have to touch anything anymore.
Sounds good. I discharge the battery at night, but my programming somehow stops the discharge at around 35%. I’m using Node-RED with a scheduler that controls the discharge. Something isn’t quite working…
Hello Pke,
? What percentage value have you set in the remote console under Settings/ESS/SOC_Mindestwert? That’s more powerful than the Node-Red programming.
Aaaand… I managed once again recently to enter a decimal number with a comma instead of a full stop in Node-Red. Just a tip…