I'm planning to buy an electric bike kit. However, I don't really like adding the display for aesthetic reason. However, the display (either LED or LCD) has function on/off and low/mid/high power on some model and this confuse me.
Can I just have BLDC motor, controller, battery, PAS, and brake sensor and hope it will work?
If you are building your own kit, you can do whatever the heck you want. The reason pre-built ones have them is both safety and convenience -- you want to know when the e-assist is on for safety reasons, what power mode you're in, and how much power you have left so you're not stuck on the road.
Without blinkenlights, it can be hard to diagnose problems, especially on the road. Is your e-assist not working because the battery is low or dead? A bad main power connection? Maybe the brake-cutoff switch is broken, etc. etc.
If you are aesthetically against the blinkenlights, you can design your own enclosure that is more modest, use dimmer LEDS or tape over them, or relocate them to make them more discrete -- perhaps under the saddle where you can still check them when problems arise.
Well I just use my 48V 1000W electric bike rear wheel 26" without lcd display. No problems. No worries.
On throttle, there is battery power display "full, half and empty". There is another signal on battery display as "5 red dots" when press. I can understand how far I can go by first test ride by using these signal.
Throttle can go slow and fast as you want but pedal assist system go full speed.
It will be very inconvenient without the battery charge indicator. One or another way the battery level should be possible to estimate, and better more precisely than "okay" and "mostly empty".
Other information is useful at times but not vital. But the battery usage may be difficult to estimate and the impact of staying without power in a long trip is major.
The LCD is useful to control the power of the PAS, on traffic you will need to control the power and the PAS works always on full power.
