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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?

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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.

  • It is handy being able to select max power when you need to climb a steep hill. I would say it's more trouble to get a kit that doesn't contain the display. – Kim Ryan Aug 15 '15 at 1:58
  • You don't need a display to be able to select power modes (depending on how you build the controller), but I've clarified my answer to accommodate. Thanks Kim! – RoboKaren Aug 15 '15 at 1:59
  • Can you tell me more whether it depends on the controller or in general I dont need a display? So for example without a display, how could I turn on the motor – Nhân Lê Aug 15 '15 at 14:40
  • It entirely depends on the controller and on your own skill in electronics. – RoboKaren Aug 16 '15 at 3:01
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    I've been known to tape over excessively bright battery indicator LEDs on bike lights but I wouldn't have thought this was a good solution to aesthetic objections. If I was designing my own system I'd add extra LEDs in fact - to help with some of the reasons you mention (I've had trouble with a broken brake sensor). – Chris H Aug 16 '15 at 12:41
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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.

  • Thank you - that's a better answer than your earlier one. So you're saying that the only information you need is battery status, and everything else is unnecessary. – Criggie Nov 9 '17 at 7:58
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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.

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