Buy prices for DESS not working with quarter hour intervals

Q&A and troubleshooting DESS
1

Hi everyone,

I’m not using the dynamic prices option for my country because I need to apply custom formulas depending on the time of day.

When I manually fill in the DESS prices, everything works fine with hourly or half-hourly intervals — the prices are applied correctly, and the graphs look as expected.

However, when I switch to quarter-hour intervals, the DESS prices don’t work properly anymore. The graphs become messed up and don’t match the prices I’ve entered.

I’m writing here to ask if anyone else has noticed this issue and if it’s already been reported as a bug.

Thanks!

2

I am having issue when i set quaterly hour prices with Tibber in the netherlands that the buy and sell pricediffer. It looks like on VRM sell price is still hourly but buy price is quaterly. It makes DESS behave strange. Should i change the formula. Please help.

3

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4

For example, I can only set fixed prices every half hour or each hour. If I try to set fixed prices for the entire day in quarter-hour intervals, the VRM gets completely messed up like you said. I think it imports hourly prices instead of quarter-hour prices.

5

Sorry my mistake. I needed to set 15min in both buy and sell

6

I’m bumping this topic because I still have the issue and haven’t found a workaround.

I’m not using the dynamic prices option for my country, as I need to apply custom pricing formulas depending on the time of day.

When I manually enter DESS prices with hourly or half-hour intervals (48 values per day), everything works as expected:

  • Prices are applied correctly

  • VRM graphs look correct

  • DESS behaves normally

However, as soon as I switch to quarter-hour intervals, things break.

What I’m seeing:

  • Quarter-hour DESS prices are not applied correctly

  • The VRM graphs become messed up and don’t reflect the values I entered

  • If I first configure all 48 half-hour slots and then manually change just one value (for example setting 00:00–00:15), all DESS/VRM values become inconsistent

This makes me suspect there may be a bug or hard limit around 48 time slots, and that quarter-hour pricing (96 values per day) isn’t being handled correctly in DESS / VRM.

At the moment I need half-hour resolution at minimum, but quarter-hour manual pricing simply isn’t usable.

Has anyone else observed this behavior?

  • Is quarter-hour manual pricing officially supported?

  • Has this already been reported as a bug?

Any confirmation or guidance from Victron or other users would be appreciated.

Thanks!