DESS and German §14a EnWG Modul 3 (dynamic grid fees)

Q&A and troubleshooting
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Hello,

I use DESS with Cerbo GX, Pylontech batteries, a MultiPlus II and solar on the roof.
I have a dynamic electricity tariff (Tibber) which is calculated hourly. The formula stored in DESS ((p+0.02+0.125)*1.19) is correct BUT on 01.01.2025 I pay variable grid charges that are time and month dependent. This is called §14a EnWG - Module 3 and is a legal regulation that could not be more German.

Unfortunately, I can only set dynamic (exchange price) or fixed price (possibly hourly fixed) in DESS.

What is needed for §14 EnWG Module 3 is dynamic exchange prices, calculated in 15 minute steps, month dependend.

For example:January - March:
00:00 - 05:30 ((p+0.02+0.063+0.020)*1.19)
05:30 - 17:30 ((p+0.02+0.063+0.062)*1.19)
17:30 - 19:30 ((p+0.02+0.063+0.124)*1.19)
19:30 - 24:00 ((p+0.02+0.063+0.062)*1.19)

April - September:
00:00 - 24:00 ((p+0.02+0.125)*1.19)

October - December:
00:00 - 05:30 ((p+0.02+0.063+0.020)*1.19)
05:30 - 17:30 ((p+0.02+0.063+0.062)*1.19)
17:30 - 19:30 ((p+0.02+0.063+0.124)*1.19)
19:30 - 24:00 ((p+0.02+0.063+0.062)*1.19)

Is there something coming from Victron or do I have to knit something myself? I’m generally happy with DESS, but from 01.01 the purchase prices for electricity would be dramatically wrong and completely unusable in their current form.

Kind regards
Jons

1 Like
2

As of January 1, 2025? I thought April 1, 2025? I’m also waiting for a solution. I’m very confident that there will be a solution there, because the problem occurs in several European countries (Denmark) and has also been mentioned in several posts. I don’t think an additional price variable over time should really be a problem for Victron. For me, the price differences are even bigger and actually perfect for using them via a system like the DESS

3

From 01.01.2025 you can decide to use module 3. The first billing will take place on 01.04.2025. At least that’s what it says in my grid operator’s tariff sheet.
Perhaps my network operator means it differently and is just unclear in the price sheet…

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I don’t think that’s quite right. As far as I know, the tiered network charges apply from April 1st. I think there’s a misunderstanding there. But I could be wrong. I’ve actually looked into it in depth and my information is always from April 1st. It’s true that the network operators always tier it quarterly.