Re: Newb Asks: Can we charge a BMW PHEV single cell module with a bench power supply?
Posted: Fri May 20, 2022 2:14 pm
by Gregski
and just for completeness here is what it looked like set to a hard 4 amp DC limit
Re: Newb Asks: Can we charge a BMW PHEV single cell module with a bench power supply?
Posted: Fri May 20, 2022 2:17 pm
by Gregski
and finally at the max of what this PSU can put out, 5 amps DC
so one thing we notice is that when we crank this unit to the max on the amp dials (coarse and fine) it actually goes a bit above 5 amps
Re: Newb Asks: Can we charge a BMW PHEV single cell module with a bench power supply?
Posted: Fri May 20, 2022 3:10 pm
by Gregski
and here we are after charging for 1 hour
Re: Newb Asks: Can we charge a BMW PHEV single cell module with a bench power supply?
Posted: Fri May 20, 2022 4:52 pm
by arber333
Just yesterday i noticed my 4th module of 16S was riding 0.5V lower than other cells. I connected 5A 16S charger to it WHILE IN THE PACK OF 104S. Charger had no problem bringing that up in 1/2 hour.
It is not a problem as long as you observe correct polarity and wear gloves and eye protection...
Re: Newb Asks: Can we charge a BMW PHEV single cell module with a bench power supply?
Posted: Fri May 20, 2022 7:06 pm
by Gregski
arber333 wrote: ↑Fri May 20, 2022 4:52 pmJust yesterday i noticed my 4th module of 16S was riding 0.5V lower than other cells. I connected 5A 16S charger to it WHILE IN THE PACK OF 104S. Charger had no problem bringing that up in 1/2 hour.
It is not a problem as long as you observe correct polarity and wear gloves and eye protection...
thank you for sharing that, what battery pack are you using that's 104S I thought 96S were pretty common
Re: Newb Asks: Can we charge a BMW PHEV single cell module with a bench power supply?
Posted: Sat May 21, 2022 1:04 am
by Gregski
captured the current dropping gradually as the battery got closer to the max voltage this PSU could spit out
Re: Newb Asks: Can we charge a BMW PHEV single cell module with a bench power supply?
Posted: Sat May 21, 2022 1:11 am
by mjc506
Is all this because you're upset with that Chevy charger? I can just imagine half a dozen Ali-express bench PSU's strapped in the back of your truck!
Re: Newb Asks: Can we charge a BMW PHEV single cell module with a bench power supply?
Posted: Sat May 21, 2022 2:25 am
by Gregski
ha ha, no this is something I've been meaning to try for a while now, and the charger is working fine it's the converter that needs a bit of an attitude adjustment, and when I built my electric motorcycle that's exactly what I did I bought six baby charger before going with a Zevan I think it was called
Re: Newb Asks: Can we charge a BMW PHEV single cell module with a bench power supply?
Posted: Sat May 21, 2022 2:32 am
by Gregski
so this is where we were at the two hours mark
Re: Newb Asks: Can we charge a BMW PHEV single cell module with a bench power supply?
Posted: Sat May 21, 2022 2:33 am
by Gregski
and I guess charged as much as we could to 61 volts after 2.5 hours
Re: Newb Asks: Can we charge a BMW PHEV single cell module with a bench power supply?
Posted: Sat May 21, 2022 2:39 am
by Gregski
alright-then-lessons-learned.jpg (102.62 KiB) Viewed 4279 times
so although technically you can charge using a bench power supply, the 60 volt unit is just not high enough to fully charge this cell module, if we go off that spec sheet we need to reach 66.33333333 volts to be fully charged or 4.145 volts per cell and we only reached 3.825 but it was fun and scratched an itch I had for a while to try this, thanks all for following along