Frankenscooter project

1528 Views 7 Replies 3 Participants Last post by macosie, Apr 28, 2020

macosie

Discussion Starter · Apr 26, 2020

I'm building a bit of a scavenged electric scooter.

I'm putting together the frame and such right now, some parts are on order, but I want to sort the electrics.

I'm hoping to use a hub motor I got from another bike. I"m not sure about the battery and contoller. They seem a bit underpowered, but might be upgradable.

The motor is a QSMotor 2000w

The battery pack is 61.2v, 28.6Ah, 1750.31 Wh - charging voltage 71.4v
(I have the charger for it.)

The controller is ??? brand. LBMCO60122 HK @A EU - M23 (anyone know what this means?) I know it's for a 60V system but that's pretty much it.

Before I disassembled the donor bike, I tried it out. It had been sitting for a while, but the battery had been charged up to 90%. A 2km drive brought that down to 70%. Top speed managed was 50kmh. The performance is horrible.

I've read that the 2000w QS is capable of much more - up to 65 kmh with a 60v system, 70 with 72v.

I'm thinking about a different controller and possibly a better battery pack.

Since I'm pretty new to actually working in something like this, I'm interested in any suggestions or thoughts on what I could do.

Thanks

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MattsAwesomeStuff

· #2 · Apr 26, 2020

Scooter as in moped-style? Sit down feet together in front?

2000 w is 2.7 hp, and should be enough for 70km/h, yes.

You can hit 50km/h with like, 750 watt.

Sounds like your batteries are either shot, or the way they're being measured is shot. Or that one cell in the pack is gone.

Charge it up, test each cell.

Discharge it a bit, test each cell.

See if there's imbalance anywhere.

Presuming it has a BMS, imbalance probably then means the cell has more or less died and should be removed or replaced.

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MattsAwesomeStuff

· #4 · Apr 27, 2020

macosie said:
I don't think there is a BMS. I haven't taken the battery apart yet, but will start working on that soon. I'll take some pics of the electronic bits at some point.

If it's lithium and it left a factory as a pack, it has a BMS. The liability relative to the cost savings puts you on the favorable side of the line every time.

https://www.youtube.com/watch?v=zFoinrdhBiE&t=37

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