1500w ebike kit, please help

K

kay.partypop

1 µW

Joined

Dec 8, 2020

Messages

3

• Dec 8, 2020

• #1

So i have my brand new 1500w rear hub motor kit and the display doesn't want to turn on. When the battery switch is turned on, the display doesn't work but when i switch off the battery, the display does turn on for 2 seconds and then shuts off. Does anyone know what could be the problem? Faulty battery or faulty controller? Before i charged the battery for the first time, the kit worked fine but now i have this problem

 

M

Manbeer

1 kW

Joined

Aug 7, 2020

Messages

313

• Dec 8, 2020

• #2

Aside from a faulty battery/faulty controller etc perhaps there's a problem with your battery charger And the battery is discharged below the low voltage cutoff set in your controller or above a high voltage cut off if there is one. First thing I would check is the voltage if you have a multimeter

 

999zip999

100 TW

Joined

Jan 10, 2010

Messages

11,795

Location

Dana Point So. Cal

• Dec 8, 2020

• #3

There are a lot of 1500 kits what kit do you have do you have a link any pictures and there's a few different displays they put on different kits.

 

K

kay.partypop

1 µW

Joined

Dec 8, 2020

Messages

3

• Dec 8, 2020

• #4

https://www.reddit.com/r/ebikes/comments/k949l8/can_someone_help_i_have_no_idea_what_happened_it/
i put a video on reddit

 

neptronix

Administrator

Staff member

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Jun 15, 2010

Messages

17,738

Location

Utah, USA

• Dec 8, 2020

• #5

Using a multimeter, what's the voltage of the battery when it is turned on vs off?

 

K

kay.partypop

1 µW

Joined

Dec 8, 2020

Messages

3

• Dec 9, 2020

• #6

it's 58v

 

neptronix

Administrator

Staff member

Joined

Jun 15, 2010

Messages

17,738

Location

Utah, USA

• Dec 9, 2020

• #7

My guess is that you're triggering a high voltage cutoff on the part of your display or controller, which was designed for 48v, and may have FETs that top out at 55v. This is to prevent things from going boom.