Hi, I know that this topic has already been started here (maybe multiple times), but it kinda seems that it is being treated as one-sided relationship from the Victron staff side, meaning that many people is complaining and there is no official reaction from Victron on how to deal with this issue. So, Im starting new thread in hope that something is going to change. I have a company that commercially installs Victron equipment in Czech Republic (mostly as a part of the solar systems for residential buildings) and (of course) I also have solar system with Victron Energy equipment at home where we are testing a lot of components and settings. My current testing setup is 3x MP 5000VA 48V, Fronius Symo 17.5 kW with 15 kWp solar panels installed and 57 kWh 51,2 V LiFePo4 battery. From the begining I liked the idea of spot energy billing, so I went on spot (buying and selling) and as soon as Victron released the first beta versions of DESS implemented in Venus, I started testing it and also with a lot of hope a little bit advertising it to our clients. Since then, my feelings about DESS have been a bit of a roller coaster, sometimes it worked well and sometimes I had to turn it off because I just couldnt watch the energy waste it was doing (mostly feeding into the grid than charging the battery during the sunny days and then taking the expensive energy from the grid in the evening). Time has passed and here we are with already official and (hopefully) still improoving versions of DESS, which really seems to be working much better than it used to, but sadly I still have to say that I couldnt really recommend it to any of our customers which Im quite ashamed of.
The most anoying issue which was and still sometimes is occuring, is that the system has some predicted consumption and solar production and mainly SOC and it just holds onto it so tight, that even if there is more solar production than expected, it just sells it to the grid even though the price is low, there is plenty of free battery capacity which obviously cant even be filled and the consumption for the rest of the day is obviously gonna be so high that all the energy could be used in the house.
Im mostly observing this behaviour now in the winter time when it is quite rare that the sun is shining, but sometimes it actually is shining and DESS just immediately sells it to the grid and then buys it in the evening when it needs it (usually at least for double price). Sometimes it is arguable if DESS acts most efficiently from the economical point of view, but at those moments Im describing here, it is just clear that it is far from optimal. Sometimes the lost profit is really negligible, but sometimes it doesnt seem negligible to me (e.g. sometimes it could save 15-20% more money).
Im attaching screenshots of my settings and of the data from the most frustrating (not optimally handeled by DESS) day from the recent history. The Venus version was 3.50 on the testing day (then I updated to 3.52), MP fw version is 502. I would appreciate some response from Victron stuff (@dfaber ), do you know about this, are you trying to solve it, are you planing to try to solve it soon? Thank you, just in case you want to check the data by yourself (I dont know if you can or not), the VRM id is c0619ab3c277.
