The last few days with lots of sunshine, I was very happy with DESS in Green Mode. But today, the first day with lots of cloud cover and rain for a long time, unfortunately not at all: Due to the low solar forecast, the target SOC was significantly reduced. According to DESS, the battery will not r…

And as you see in my first post here: DESS feeds into grid instead of charging the battery! Target-SOC stayed very low for the whole day yesterday, nevertheless DESS sold PV surplus to grid instead of charging the battery. That doesn’t make any sense?

[image] Dirk-Jan Faber (Victron Energy): 99.9% sure that the flow isn’t going from the battery into the grid, but going from the battery to the loads and from the PV installation to the grid. I agree, but PV should load battery first in green mode

I am seeing the same behaviour on a couple of occassions but maybe for a different reason. I’m running the UK Octopus tariff on DSS and I’ve just seen a situation where the price fluctuates which would be the ideal opportunity to charge the batteries from the grid in a burst. Currently I’m sat with…

I think, thats a different story. You are discussing charging battery from grid at low buy prices. The problem i want to discuss here is that PV surplus is sold to grid instead of charging the battery although SOC is at a very low level. That’s a behavior which shouldn’t be at Green Mode

Sorry @grua I have had the exact same issue where solar has been exported rather than charge the battery. My last message was a little distracting and I wasn’t meaning to waddle off topic there. Apologies for that. That said, my observation outlined had me thinking with regard to the solar export …

Thanks @seimon I’ve got my install set to 1min / realtime however when I get a mathematical benefit to a tarrif that crosses 30 minutes past the hour e.g 10:30 - 11:30, the relevant action is not evaluated or re-evaluated hence my query around schedules. That said, I haven’t been able to find any h…

I think that issues are actually being mixed up here. The topic I mentioned here “PV surplus goes to the grid in green mode instead of to the battery” has nothing to do with 30min tariffs. I have a 60-minute purchase price and a constant sales price. Concerning 30min tariffs please move to another …

Today Green Mode looks good: PV surplus is used for charging the battery instead of selling it to the grid, although target SOC higher than actual SOC: [Screenshot_20240911_084050_VRM] [Screenshot_20240911_084042_VRM] I’ll keep an eye on this and report!

DESS feeds into grid instead of charging the battery!

Q&A and troubleshooting DESS

seimon 10 September 2024 11:22 16

@dfaber confirms here that the schedules are 30 or 60 minutes and also get re-evaluated every 15 minutes: Interesting 5 minute offset DESS - #2 by dfaber

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DESS feeds into grid instead of charging the battery!

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