As some of you dutchies have seen. Zonneplan will increase the sell price from sunrise to sundown with 2 eurocent +10% on top of the energy price. I would like to change the formula accordingly for the DESS. But there is no such thing as dynamic dynamic ess pricing. Could this be implemented on relatively short term? It does not change a whole lot, but the price difference between the moment of sundown and shortly there after is substantial.
Looking at today, Sunrise is 7:18 and sunset 20:14
Highest prices are from 8-9 and between 19-21h
To compensate in the mean time it will be around +1,5ct in the formula for sell price.
I dont think i am going to do the effort to change it for so less difference.
Heey Huib.
I think you underestimate the difference in pricing. Before 20:14 the price would be 22+2*1,1=26,8 before taxes. and After 20:14 this price would be 24. (I don’t know yet exactly how Zonneplan applies this bonus, maybe they take the whole hour or the last full hour) I agree that for a big battery such like our system it does not change much. As in our system it will take multiple hours to offload the solar power. But in a 3 phase system, multirs system, you could unload the battery in 2/3 hours so finding the right peak is crucial. If the marketprice before sundown is slighly lower than the price after sundown(not logical) but possible. It could in theory be possible that this 10% creates much higher peaks right before sundown. Where you would want to prioritise offloading with the bonus in comparison to where there is no bonus. I would argue on long summer days this is quite irrelevant. But on short winter days where sun doesn’t shine and the price is relatively constant this changes a lot!
I hope you understand. Thanks for your time:)
Edit: I misunderstood the prices. There currently is also a 2cent bonus. The difference being the 10%.
What i have done for tomorrow… the import of current still limited at 150A (3x50A from 3x70A) for eliminating heat losses but the export current ( was previously limited at 7200W so the sell back will take place in 2 hours) but now changed to unlimited power so all the current is flowing before 20:00
i have 3x MP48/5000 and 4x Pylontech US5000
Yeah we have a multiplus 8kva(we have 1 phase 35A) and a 45kwh battery so in our case it’s almost irrelevant as we will be selling energy throughout almost the entire evening. But my uncle and aunt(also dutch) have a 3 phase setup and they want me to set up a 3 phase multi rs system and in their case it will be relevant
Ok, your question makes sense now.
The big sell back in my situation is solar export and selling back from battery is only to compensate the energy losses and powering the victron inverters. i am nog going to make a lot of money with only the home battery. My main use was flatten the peaks when car charging and washing/dryer/heat pump all simultainously takes power from my 3x25A connection.
The bigger benefit will come in 2027 when the “salderingsregeling” is gone.
I’ve spent an hour callling customer service of Zonneplan to figure out how they will apply this zonnebonus. But they have forgotten to take battery users like us into account. They specifically said it only applies to “solarpower”. Well yeah goodluck figuring that out. But if you decide to unload electricity at night, they also consider it as solarpower as the app will say 100% green energy even if you charged your battery using only gray power. So i’m not sure if they add restrictions from sunrise to sundown. Or if they take only take full hours in which the sun is above the horizon. But an additonal 10% during rushhour is great!
lets wait and see the next coming days
They did tell me it was only gonna be possible to see on the “monthly bill” so that would take until june before you get to see how they calculate it for april.
i hope homewizzard will implement this benefit as well in their solar return calculations for dynamic zonneplan prices otherwise the total prices for all-solar and total power bill are incorrect
For the short term, if you are familiar with node-red:
- install the Suncron node to get sun rise and sun set. If you click the location button it will use your current position
- configure the node to send the 2 different prices to the VRM-API node. It does not need a trigger as it has a cron function. Just leave the topic empty and inject the json payload values for sell: sellPriceFormula: “(p+0.01653+0.10165)*1.21” and sellPriceFormula: “(((p+0.01653)*1.10)+0.10165)*1.21”
- configure the VRM-API node for Installations/Patch DESS settings
Not that difficult but it will have some gaps. Like sunset lowering the price in the middle of an active DESS sell event at some point in time, or negative pricing causing an opposite effect unless you add more programming.
I guess you cannot win them all. Not so sure I am going to actually use it but love to help if someone wants to give it a go.
Sorry but i am an mechanical engineer with some electrical experience but programming (beyond the possibilities of my homey) is to far away from me.
Ah well… Node-Red is part of Venus OS large. Importing a flow, registering an api key in VRM Portal and making it work is <5mins. So if you are ever bored on a rainy day don’t hesitate to reach out 
And I’m a applied physics student, but all that is also a bit above my paygrade or as we say in dutch “dat gaat mijn pet te boven”
I will definitely take it into account and maybe when i have a bit more time ill definitely take a loon at it:)