Zedredcycler
1 µW
- Joined
- Nov 6, 2017
- Messages
- 1
I really don't understand how voltage limiting, current handling, and current limiting work within an electric bike controller - I'm hoping someone on here can enlighten me!
A little while ago I bought a standard 1000w 48v electric bike conversion kit on eBay, and a separate 10.4ah 48v battery. When I'd connected it all up and started riding it I noticed that the full range of my setup was about 13 miles, but that after riding it for about 10 miles the power started to significantly drop. For the last mile, you could only get a slow crawl out of the bike, with power dropping to about 5% of full charge power.
I figured this was because of the voltage drop of the battery, which over the course of a discharge changed from around 51v to 42v, and so I messed around with the configuration settings on the LCD display on my bike and changed the expected voltage to 36v. This completely fixed the problem bringing the power level back up to about 80%. In fact on the 36v setting, the bike seemed to be locked at 80% max power through full to almost all of the discharge of the battery, and the battery would die quite suddenly when it was completely empty (I know this isn't good for the life of your battery, I don't do it often).
My questions are about the mechanism behind this, and whether they are automated systems that achieve the same effect. I want to buy a custom controller from China, and I don't want the power to drop significantly as the battery discharges.
Is there a special component I can ask them for to emulate the effect above?
Do I need to get a controller with both 48 volt and 36 volt settings?
Is running a partially discharged 48 volt battery (outputting 46v to 42v) through a controller expecting 36 volts bad for the battery or controller?
Many thanks in advance x
A little while ago I bought a standard 1000w 48v electric bike conversion kit on eBay, and a separate 10.4ah 48v battery. When I'd connected it all up and started riding it I noticed that the full range of my setup was about 13 miles, but that after riding it for about 10 miles the power started to significantly drop. For the last mile, you could only get a slow crawl out of the bike, with power dropping to about 5% of full charge power.
I figured this was because of the voltage drop of the battery, which over the course of a discharge changed from around 51v to 42v, and so I messed around with the configuration settings on the LCD display on my bike and changed the expected voltage to 36v. This completely fixed the problem bringing the power level back up to about 80%. In fact on the 36v setting, the bike seemed to be locked at 80% max power through full to almost all of the discharge of the battery, and the battery would die quite suddenly when it was completely empty (I know this isn't good for the life of your battery, I don't do it often).
My questions are about the mechanism behind this, and whether they are automated systems that achieve the same effect. I want to buy a custom controller from China, and I don't want the power to drop significantly as the battery discharges.
Is there a special component I can ask them for to emulate the effect above?
Do I need to get a controller with both 48 volt and 36 volt settings?
Is running a partially discharged 48 volt battery (outputting 46v to 42v) through a controller expecting 36 volts bad for the battery or controller?
Many thanks in advance x