static absorption time

[mdkeil]

Is it possible to set a static absorption time (e.g. 30 min) or an minimum time before the driver goes to "float"?

Background:
Seplos BMS 10E requires 30min on 16x Cell OVA to set the SOC to 100%.

Edit: with NEEY active balancer at 2A It takes less than 15 minutes for the cells to be balanced (deviation 5mV)

[mr-manuel]

Yes, just use

dbus-serialbattery/etc/dbus-serialbattery/config.default.ini

Lines 103 to 107 in 88274bf

	; -- CVL reset based on SoC option (step mode & linear mode)
	; Specify how long the max voltage should be kept
	; Step mode: If reached then switch to float voltage
	; Linear mode: If cells are balanced keep max voltage for further MAX_VOLTAGE_TIME_SEC seconds
	MAX_VOLTAGE_TIME_SEC = 900

but with linear mode the BMS goes to float only, if the cells are balanced. Therefore no static time needed.

dbus-serialbattery/etc/dbus-serialbattery/config.default.ini

Lines 95 to 101 in 88274bf

	; -- CVL reset based on cell voltage diff (linear mode)
	; Specify cell voltage diff where CVL limit is kept until diff is equal or lower
	CELL_VOLTAGE_DIFF_KEEP_MAX_VOLTAGE_UNTIL = 0.010
	; Specify cell voltage diff where CVL limit is reset to max voltage, if value get above
	; the cells are considered as imbalanced, if the cell diff exceeds 5% of the nominal cell voltage
	; e.g. 3.2 V * 5 / 100 = 0.160 V
	CELL_VOLTAGE_DIFF_TO_RESET_VOLTAGE_LIMIT = 0.080

[mdkeil]

Thxs for the answer; I know these options- but how I can only use the step mode? or deactivate the linear mode?

[mdkeil]

; Linear mode: If cells are balanced keep max voltage for further MAX_VOLTAGE_TIME_SEC seconds

ok that fact i did not read correctly.. ("for further") Therfore MAX_VOLTAGE_TIME_SEC = 1800 should be the right settings for me.

[mdkeil]

it doesnt work..

with LINEAR_LIMITATION_ENABLE = True and MAX_VOLTAGE_TIME_SEC = 1800

because of setting to float mode 300s after cell diff is below CELL_VOLTAGE_DIFF_KEEP_MAX_VOLTAGE_UNTIL = 0.010

[mdkeil]

some screenshots from my monitoring:

max voltage: 55,6V

15:41:16 - max voltage at 55,6V
15:49:01 - cell diff voltage below 10mv
15:54:11 - start to drop down voltage

; Specify how long the max voltage should be kept 
 ;     Step mode: If reached then switch to float voltage 
 ;     Linear mode: If cells are balanced keep max voltage for further MAX_VOLTAGE_TIME_SEC seconds 
 MAX_VOLTAGE_TIME_SEC = 900 

example from Charge Voltage limitation

The battery reached max voltage of 55.2V and the max cell difference is 0.010V, then switch to float
;          voltage of 53.6V after 300 additional seconds to don't stress the batteries. [..]

The implemantation does not fit with the discription.

[mdkeil]

updated from last release (from may) to last nightly@dev, further testing tomorrow.

[mr-manuel]

Please put a hashtag # in the front of this line

dbus-serialbattery/etc/dbus-serialbattery/battery.py

Line 443 in 4c2b89c

"""

and reinstall the driver by running /data/etc/dbus-serialbattery/reinstall-local.sh. This allows you to see extended debugging info unter the parameter page. There you also see when the timer for MAX_VOLTAGE_TIME_SEC starts.

[mdkeil]

not enought sun-power to get the battery full of charge, but the driver shows "Absorption (Linear Mode)" as charge mode all the time.

[mr-manuel]

You are answering to your question already yourself. How should the charger switch to float, if there is not enough sun to complete bulk/absorption?

[mdkeil]

before switching to nightly-build the charge mode was a little bit more "detailed" with different states starting from "Bulk (Linear Mode)".
So I was surprised that it only ever shows "Absorption" (before Float state)