question

Warwick Bruce Chapman avatar image
Warwick Bruce Chapman asked

ESS Battery Size tied to whether "Enable battery monitor" is checked

I routinely untick "Enable battery monitor" because the batteries we use always have an internal BMS which provides SoC et al.

1618031592683.png


I noted today during a commissioning that the size (Ah) of the battery in the ESS configuration is tied to whether the battery monitor is enabled or not on the General tab.

With "Enable battery monitor" ticked:

1618031868407.png


With "Enable battery monitor" unticked (note also the two mentions of battery capacity differ 10Ah vs 0Ah):

1618031915967.png

ESS
1618031592683.png (182.9 KiB)
1618031868407.png (145.4 KiB)
1618031915967.png (145.2 KiB)
2 |3000

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

2 Answers
Ingo avatar image
Ingo answered ·

It shouldn't make any difference if the internal one is On, the BMS manages the battery. Just set your ESS to the correct AH capacity and leave it like that. Because the BMS is selected as the battery monitor the internal one is of no consequence as SOC comes from the BMS.

3 comments
2 |3000

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

Warwick Bruce Chapman avatar image Warwick Bruce Chapman commented ·


What I’m trying to say is there is no use setting the ESS SOC, because it gets lost if you untick enable battery monitor

0 Likes 0 ·
Ingo avatar image Ingo Warwick Bruce Chapman commented ·

Then don't untick it.

0 Likes 0 ·
Warwick Bruce Chapman avatar image Warwick Bruce Chapman Ingo commented ·

Lol

0 Likes 0 ·
Daniël Boekel (Victron Energy Staff) avatar image
Daniël Boekel (Victron Energy Staff) answered ·

Hi @warwick

this has a reason and is also stated in the manual:
https://www.victronenergy.com/media/pg/Energy_Storage_System/en/configuration.html#UUID-7435bdda-8f3f-81c2-a1a6-dc8f1c9b2f8f

[quote]

General tab: the ESS Assistant will have enabled the built-battery monitor. Leave that enabled (!). Also when there is a BMV or intelligent canbus-connected battery in the system.

4 comments
2 |3000

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

Warwick Bruce Chapman avatar image Warwick Bruce Chapman commented ·

Crap. We need to amend some battery documentation eg. FreedomWon to reflect this. @Guy Stewart (Victron Community Manager), remember this during the FW documentation process - we said it didn't seem to matter whether on or off.

0 Likes 0 ·
Show more comments