[ 3 / biz / cgl / ck / diy / fa / ic / jp / lit / sci / vr / vt ] [ index / top / reports ] [ become a patron ] [ status ]
2023-11: Warosu is now out of extended maintenance.

/diy/ - Do It Yourself

View post   
File: 209 KB, 600x405, csm_74ER1068_E-RIOT_TRAIL_PRO_CF_RED_5f17f940b6.png [View same] [iqdb] [saucenao] [google]
2049233 No.2049233 [Reply] [Original]

I have a E Bike with 36V Li-Ion system and I want to charge it at my 12V PV system on the camper when I´m camping.
I can get 240V AC chargers easily but there are barely any 12V chargers.

Can´t I just use a 12 to 42V boost converter, because the BMS in the battery should do all the CCCV charging magic right? Or is there more involved?

>> No.2049235
File: 1.65 MB, 2000x2000, 811677-Zuendapp-Z502-Ladegeraet-E-Bike_1.jpg [View same] [iqdb] [saucenao] [google]
2049235

>>2049233
Oh yeah the AC chargers usually look something like pic related. Isn´t that just a normal Switching Power Supply with 42V output?

>> No.2049255

>>2049233
Bms won't do "cc/cv" magic, because it does balancing, overcharge, undervoltage, overcurrent protection. But when you supply over current it disconnects the battery, it doesn't regulate current linearly.
But yeah, you can absolutely use a boost converter, just make sure that 1. output voltage is exactly 42v (should be easy with a variable voltage pot) and 2. current is what your battery and bms can handle. Your pic shows 2A so thats probably ok

>> No.2049277

>>2049235
It is a normal switching power supply with 42V output, but it's because chang is cheaping out, it's better to have a proper lithium charger. But these work, and so will a simple boost converter.

>> No.2049285

>>2049255
>>2049277
Thanks, I figured. I´ll try to get a boost converter that isn´t complete chinkshit

>> No.2049377

>I spent $20,000 to power a $400 electric motor that gets me 20 miles on a good day

or you could have just pedaled for free