System: Victron Multiplus-II 3 phase 48kWh / 52V battery Cerbo GX with DESS enabled Hourly dynamic tariffs Charge power limit: 7kW (set both in ESS and DESS settings) VenusOS 3.80~4. Observed behavior: Every 15 minutes, DESS sends a new SOC target to the inverter. The inverter starts charging at…

I find it strange that your target SOC seems to be in steps of 1%. With your 912ah battery that is about a half kWh per 1% (with 7kWh/4 quarters = 1,75 kWh per quarter that will not give a lot of precision). If i look at the target SOC’s on my machine they have 1 digit precision. A correction from…

I really appreciate your effort and help (as before). But I wouldn´t want to go that length. I expect a working system from Victron. A bit tweaking is ok, but there are limits. I don´t have strange parameter settings, I believe. [image] Maximum inverter power also 7kW Maximum charge current 130A…

Settings look fine to me. I think there is something wrong with your target soc precision, not sure why. It should be 1 digit precision (i think that was one of the things they fixed lately to increase that precision).

I could go back to 3.70 but @nickdb pointed out to me that the venusos release is not relevant for the problem. But I will try anyway. Maybe this bug was reintroduced in 3.80 beta?

Actually spot on! Mar 9, 2026, 16:15:04, 85 Mar 9, 2026, 16:30:04, 88 Mar 9, 2026, 16:31:15, 87 Mar 9, 2026, 16:45:04, 91 Mar 9, 2026, 16:46:15, 89 Mar 9, 2026, 21:29:26, 55.96 Mar 9, 2026, 21:30:04, 59.43 Mar 9, 2026, 21:31:19, 59.46 I reverted back to 3.70, switched logging on, and watch,…

[image] Rob Meerwijk: . I don´t have strange parameter settings, I believe. If you are willing to try a small experiment, try swapping grid power limits and battery power limits. I know that sounds counter intuitive but how it works for the scheduler is that it schedules against the lower lim…

you will still get corrections from VRM.. but the impact will be a lot less (0.1% min instead of 1% min steps).

First I try to stay at 3.70. Peak shaving doesn´t work yet. But I hope my problem is solved for now. Apparantly a former fix was undone in 3.80 beta.

[image] Rob Meerwijk: Maybe this bug was reintroduced in 3.80 beta? You could be onto something here, or this could be due to selecting the other BMS/Shunt as main battery monitor.

@dfaber It looks like target SoC coming from VRM lost digits in the current beta. Maybe you should look into that.

DESS charges only 1-2 minutes per quarter due to hourly SOC target communicated every 15 minutes

Q&A and troubleshooting DESS

UpCycleElectric (Jan) 10 March 2026 22:12 46

I made an Excel sheet that shows exactly how the VRM scheduler takes the roundtrip efficiency into account. Let me know if/when you are ready to do some fine tuning of your DESS settings.

DESS thermal balancing and losses discussion

Topic		Replies	Views
DESS: charging goes through 15 minute cycles DESS dess , multiplus-ii , 3-phase	103	1846	19 October 2025
DESS not honoring "zero sell to grid" today ? (2025-05-10 + 2025-06-16) DESS vrm , dess	35	555	18 June 2025
DESS: strange behavior 10 minutes before the hour DESS ess , dess , cerbo_gx	33	552	18 March 2025
Dynamic ESS does not charge fast enough to reach target SOC DESS diy , dess , cerbo_gx	7	141	13 March 2026
DESS needs a rework from SCRATCH DESS dess	54	2504	1 August 2026

DESS charges only 1-2 minutes per quarter due to hourly SOC target communicated every 15 minutes

Related topics