I’m running my system in ESS mode at the moment. Battery is full, there is solar energy being generated and I expect that this is returned to the grid. Why suddenly is the system discharging the battery? I would expect the battery to stay in idle mode until there is power required which cannot be de…

Another strange ESS behaviour, in my view. There is enough solar power, the battery is being charged but still power from grid is being pulled. Why? [image]

Tell us more about your settings. About assistants installed.

What do you mean with “assistants”? Running in ESS mode. DESS is switched off. Multi RS Solar with Gerbo GX and two JK-BMS V15 with EVE 318Ah batteries. There are two MPPT’s in the setup but no solar pannels connected yet. What other information do you need/can I share? [image]

Another strange behaviour, at lease in my view. Could be due to a misconfiguration of course, if so, what to change? I scheduled a grid charging schedule in the Multi RS Solar → ESS → Scheduled charge levels and of course at the time it starts charging from grid. But the solar generation was reduce…

Thx for sharing that. This is not directly DESS related, but I will forward it to be looked at.

Thanks @dognose for looking into this. For clarity, and I hope my expectation is correct and this is the way how it should work. When a charging schedule kicks in to charge the batteries from grid, still all available solar power needs to be used to charge the batteries as well. My current observa…

@dognose Another example of this issue, solar generation reduced when charging battery from grid. Screenshots are taken within 30 sec or so from each other. On the left the charging from grid enabled, solar generation 1453W, the picture on the right, solar charging from grid disabled, solar generat…

As for the first scenario (discharging to grid) , I had this too in the past. I think this is because, when the batteries are full, the system changes to float which most likely has a (much) lower voltage and the system start discharging the battery at this point till the float voltage is reached. Y…

For the reduced mppt charging during grid charging. Have you enabled in ess settings; allow DC-coupled pv - feed in excess? if not try this.

Interesting suggestion, thanks. I’m running a Multi RS Solar. My ESS config options are very limited, I cannot find the DC-coupled PV option! [image] [image]

Running ESS and systems starts discharing 4kW, why?

DIY

RGroothuis (Rene) 10 June 2025 11:24 12

I found another discussion ongoing which is probably exactly the same as I’m experiencing:

Topic		Replies	Views
ESS strange behavior. No excess export once SOC 100% is reached. Charge/discharge oszilation in EV DIY expert , ess , vrm , bms , cerbo_gx	12	493	1 May 2025
End of charge / 100% SoC behaviour, system keeps charging/discharging DIY diy , ess , venus-os , bms , multiplus-ii	10	563	22 June 2025
Strange behaviour on DESS running with Cerbo/Multi RS Solar DESS diy , ess , dess , multi_rs , cerbo_gx	18	405	3 April 2025
DESS: PV returned to grid instead of battery charging DESS diy , dess , victron_community	53	1020	2 May 2025
MPPT doesn't stop to charge after battery is fully charged DESS ess , dess , feed_in , cerbo_gx , dyness	11	732	19 November 2024

Running ESS and systems starts discharing 4kW, why?

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