Trouble Activating Daly Smart BMS

AG Dorsum

AG Dorsum

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Nov 4, 2020
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I have a new Daly 100A Smart BMS that I cannot get to activate. I don’t have a 48+v charger so have tried a couple of solutions found on YouTube to no avail. Steps taken so far:
Balance leads have all been tested to ensure correct wiring and voltage.
Balance lead connector plugged into BMS. No other connections, B- and P- free.
First attempt activating was by touching B- to P-, connecting B- to battery negative, use multimeter to test between battery positive and P-, No voltage.
Second attempt at activation was by using multimeter to do a continuity test between B- and P- with only balance leads connected. No change at multimeter, shows .0L. When B- connected to battery negative and multimeter test between P- and battery positive, no voltage.
Inverter I am using does not turn on if battery not connected.
Using AstroAI DM6000AR multimeter

Are there any other procedures to try before buying a charger for 1 use?
 
AG Dorsum said:
Are there any other procedures to try before buying a charger for 1 use?
Click to expand...

I am afraid not. You need to apply a higher voltage then the battery voltage from outside somehow to create a tiny charging current. Then the BMS will unlock.

Do you have 2 PV-panels which can create something like 60V or higher in series?
 
Unfortunately no panels and I would have to get 2 or 3 neighbors to loan me their car batteries :cry:
 
How about a boost converter? You could also try connection 2x 24VAC wall transformers together in series, and then put full rectifier on the ends to get 48VDC.
If you have 14 single Lithium cells, you could also temporarily connect them together in 14s1p configuration.

Use tape to hold them together, applying the tape length wise. Then, to make a tight connection, slide a piece of thin metal (like the metal tabs that come with the packs) in between the cells, doesn't have to be much, just enough to tighten the tape and make sure the fit snuggly together.
Then you'll have a 14s1p battery you can connect to the bms to turn it on.

If you don't have lithium cells, you can use 6x 9V batteries connected in 6s.
Or you could take 32 alkaline batteries and connect them up in series, like I mentioned above with the tape.
 
I do have spare lithium cells so will try your idea @Korishan! Let me know if this will cause a meltdown or not (preferably not).
Option1:
BMS balance leads stay connected to the 14s30p battery as well as B- to negative of 14s30p
BMS P- connected to negative on 14s1p battery
Positive from 14s1p to positive of 14s30p with 15A auto fuse (just in case)

Option 2:
Leave everything connected ‘as is’, connect negative from 14s1p to negative busbar, positive from 14s1p to positive busbar with 15A fuse.

14s30p battery is at 47.2v, 14s1p is at 56v. I am putting a fuse in-line for protection since this will be an uncontrolled discharg.

I prefer option 2 but am afraid I am missing something and don’t want a mushroom cloud over my house.
 
probably should have the same voltage on both 14s battery strings. Otherwise you'll probably blow the fuse easily. You could put a beefy resistor in series instead of the fuse to slow down current dump, tho.
 
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