Active SoC stuck at 80 %

Question

question

inigodu asked Apr 11, '19

Active SoC stuck at 80 %

Hi! I have a question regarding the functioning of the parameter 'Active SoC limit' that can be found in the ESS. While in mode 'Optimized (with BatteryLife)' I started playing with the different parameters to test the installation, and in particular with the parameter 'Minimum SoC (unless grid fails)'. At first, both 'Minimum SoC (unless grid fails)' and 'Active SoC limit' had the same value, but after increasing the value of 'Minimum SoC (unless grid fails)' up to 100 %, the 'Active SoC limit' became stuck at 80 %.

I would like to know what does this parameter 'Active SoC limit' really mean and what's the functioning behind, so I can have a better understanding of it once I change the value of 'Minimum SoC (unless grid fails)'. I have already read the ESS Manual but it is not very clear to me yet.

I would like to add that my installation works mainly disconnected from the grid except in a few occasions that it is connected for short periods of time. I don't know if that has anything to do with the system recognizing this and, thus, trying to set a high value according to this characteristic.

Thanks!

ESS SOC

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Paul B answered · Apr 12, 2019 at 04:52 AM

Optimized (with battery life) is for lead acid batteries

are you using Lipo if so then change to Optimized (without Battery Life

1555044683854.png (43.7 KiB)

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Modifications Space

Node Red Space

Answer 1 · 2021-05-04T08:27:36Z

Hendrik Coetzee answered · May 04, 2021 at 08:27 AM

It might be worth reading the victron docs (again?):

https://www.victronenergy.com/media/pg/Energy_Storage_System/en/controlling-depth-of-discharge.html#UUID-af4a7478-4b75-68ac-cf3c-16c381335d1e

Specifically, the following might be relevant to BatteryLife:

Certain lithium batteries also need to be fully charged regularly in order to balance their cells. This includes the Victron 12.8V lithium batteries, for which it is mandatory to enable BatteryLife.
In case of mains failure - having no spare energy available from the batteries to power the loads defeats the whole purpose of having a battery back-up.

I know that my BYD needs to hit 100% (or 10%) in order to calibrate the BMS. If I do not take steps to ensure this happens, SOC get weird (and I see strange voltage drops during the evening, after min SOC has been hit).

The main idea of BatteryLife (and the Active SOC Limit) is to automatically get your battery back to 100% during daylight hours, in a way that adjusts (slowly) to environment/situation.

From the docs, it is also clear that this is not exclusively for lead-acid batteries, but lead-acid installations will probably see the most benefit (in preventing damage).

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Answer 2 · 2022-01-27T21:15:53Z

airbag888 answered · Jan 27, 2022 at 09:15 PM

Sorry for raising this months later but if I understand correctly, there is no way to influence the active SoC?
My situation is that I produce a lot more than I can store (yes I should get a bigger or more batteries eventually)
So by the time it's 10am my batteries are already full from the 20% where the min SoC limit is at.
My concern is sometimes I want to raise that min SoC say to 40% just to have some more reserve on days where I suspect there may be a powercut. Then close to the morning I'd push the SoC limit back to 20%.
I was thinking of doing that via MQTT using my home assistant setup but each time I change the SoC limit the Active SOC goes up to almost 100% and takes days to go down to 20% which is kind of silly...

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Answer 3 · 2022-04-07T18:46:37Z

solarlion answered · Apr 07, 2022 at 06:46 PM

Have the same Question.

I now how the automatic minimum SOC Works from the manual, but sometimes I don’t want to wait 12 Days for it to fall by 5% a day from 80% to 20% when I know there is enough energy tomorrow. So I look for a way to manual adjust this value and then continue by this ESS algorithm to skip wasting 12 days’ worth of energy.

Is there a MQTT endpoint to write this value?

6

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

nickdb ♦♦ commented · Apr 07, 2022 at 06:58 PM

Just change modes to without batterylife and raise the minimum soc as necessary.

Outside of European nations and their iffy weather and daylight savings, I just leave it disabled. Lithium can survive a few days without being fully charged daily until weather improves. Batterylife is just too lazy to be any good outside of the northern hemisphere. It is far easier to adjust the minimum soc.

0 ·

solarlion nickdb ♦♦ commented · Apr 07, 2022 at 07:48 PM

Thank you for the tip. But unfortunately I am out of the north :(. So really want to use it and think its a good feature. Its just for the start because its a new system and I dont want so many days to wait until it is operable.

1 ·

thanar commented · Jan 13 at 08:45 PM

Having the exact same issue. Just a bit different. I have been using BatteryLife with my lithium installations, and I find it very useful and well-thought. However, today (while the BatteryLife SOC was at 45% trending to 40%), I accidentally adjusted the minimum SOC to 80% and now the BatteryLife SOC jumped to that value. There should be some way to set it to a specific value and then let it do its thing.

0 ·

solarlion thanar commented · Jan 14 at 09:28 AM

There is a way to do so: You can set both values minSOC and SOCLimit over MQTT or Modbus. The build in algorithm then continues at the newly set value.

1 ·

thanar solarlion commented · Jan 14 at 09:52 AM

Would it work over nodered?

0 ·

solarlion thanar commented · Jan 14 at 11:46 AM

yes

1 ·

question