Hi
@lift35 , what you are sharing at the end is interesting for me - do you mind sharing BOM and schematic for what you did for the reset board?
I have a set of these batteries (1st revision, black) and for whatever reason one of them makes them all go in storage mode, once connected to the BMS comms line.
Hi marin,
What I did was on a green U27-12XP but I guess it may be done on any Valence battery internal board.
For information :
- cycling reset intend to take benefit of the 120s activated waiting time at turn on of internal board or last communication from BMS
- I guess RESET counter is incremented internally (data value in Valence Diag software) and may cycle as well... I have 2 batteries which are cycling since 2 years without any issue.
- when RESET, LED are flashing RED and GREEN for several seconds : it is therefore easy to check cycling is activated (GREEN flashing every 5s and RED/GREEN flashing every ~120s) or not (GREEN flashing every 20s)
- when internal balancing is activated, it only take care of single battery itself : this will not make inter module balancing and is recommended for single string module (several in parallel are ok)
- even optimized, consumption of cycling reset is 10 to 20mA, hence 3.3V : I do recommend an external way to it switch off when battery is let out of any charger for more than 6 monthes
- simple switch to 3.3V and GND : both since RESET pin is pulled up and may draw some current as well...
- in my case, I cut communication wires to let (or not) GND and 3.3V supply Reset board, meaning both male/female plugs must be plugged together to activate RESET board (no switch, but no communication anymore...)
- internal Valence board is varnished : it must scratched locally before soldering
- RESET board must be tested and tuned on the table before
- RESET board must bed carefully rubber taped and may be placed back toward internal Valence board
- Indeed, breaking warranty tapes will be needed to access to internal board (remove rubber caps with a flat screwdriver to get access to screws...) and I do not endorse responsability for these modification : do it carefully since short circuit may be dangerous even for low voltage.
- infinite loop board I used (5V) :
https://fr.aliexpress.com/item/4001...xp_id=112458e1-4ad5-40d9-b654-ef8f7f9b632e-51
- RESET board configuration jumpers may be touched (I did it 2 years ago...).
Your internal board may not be same as U27-12XP, therefore you will have to find RESET pin of the Main Controler Unit (MCU).
A "RST" is written on test connectors at back side so it was quite easy for me to find RESET pin.
If you get difficulties to find it out, post high resolution pictures of both sides and I may help you as Dr Watson
You can try as well to get MCU datasheet for RESET pinout.
Unfortunaly, I do not have that much time to make a step by step wiki with pictures but I guess it may be enough if you already handled electronic soldering.
Feel free to ask for help!