question

Yes it is set as user defined mode

Please read what is written in the screenshot before 60.8V

well bms have 2A active balancing but please watch the YouTube video and you can see that BMS want to stop charging and it sop charging for 1->2s and after switch ON charging and after 1->2s OFF again and so one

problem is BMS is not doing his job to stop charging when cell OVP value is reached

i want to set charging V to 55.2 and is set in MPPT but in VM 60.8 is set and even i set the V to 54 ot 53.6 that is float voltage charging is still performed battery voltage keep rising

yes regarding CAN connected BMS but i did not connected because of the connector so tiny and specific

So the answer to my questions

Q -> what is the reason for different V

Q -> is there a way to fully control MMP from VM remote console like from Bluetooth APP ?

Q -> what is the reason "ext control" is displayed? what device is controlling the MMPT?

Q -> in MMPT absorption is set to 55.2 and batt voltage is still rising, why?

READ THE USER MANUAL!!!

https://www.victronenergy.com/media/pg/Energy_Storage_System/en/configuration.html

" 4.6. MPPT Solar Charger

In ESS, the MPPT Solar Chargers will follow the charge curve as set in VEConfigure. The charge parameters configured in the MPPT Solar Chargers themselves are ignored in an ESS setup.

The Charge current, however, still needs to be configured in the MPPTs.

MPPT with VE.Direct comm. port

No special configuration is necessary."

But the problem is that i read the user manual and i understand the above statement

What i do not understand what is the reason for ESS still overwriting MPPT settings when charger is NOT ENABLED IN VEConfigure, and in ESS setup wizard setting for battery is:

1 Battery system is set to "system use LiFePO4 with other type BMS ..."

2 Battery type selection is set to "Do not change battery type"

Why is not specified in manual that even if charger in VEConfigure is not enabled ESS will still use the values from charger TAB,

Don't you think should this be specified in user manual no meter what is this ->

a) an unsolved problem -> BUG

b) an intended way of behavior

Workaround would be to not use ESS

- but i need it, i do not feed in but when solar not available and battery is in discharged state pass true is my option

or to disconnect MPPT from VE BUS but then what use is the monitoring in VM is for?

Question -> what values must i set in the charger TAB to use the Tail-Current?

and where i can specify the Tail-Current value?

Hi @clauberty

You don't need ESS to bring on ACIN automatically. This can be done with other Assistants, like Generator Stop & Start, and the Ignore AC function. This then gives you back simpler controls. The mppt Tail function is in the mppt Expert settings I think, and you'd be able to use it without ESS.