MH RYZ (derbi 50cc)

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guiga   100 mW

100 mW
Posts: 45
Joined: May 27 2018 11:54am

Re: MH RYZ (derbi 50cc)

Post by guiga » Mar 13 2021 5:48pm

Hey hope you can have some ideias from the build. I use all the bolts , at beginning i did mistake when doing the holes for the motor support and had to drill new ones lol. The motor is bolt with a aluminium plate in one side and the own motor bracket is bolt in midle of frame , hard to see. I try to set it up all very tight and make it ligth as possible. My goal is to have a bike with decent performance and same time be nimble with good weigth distribuition. Im sory for my english.

guiga   100 mW

100 mW
Posts: 45
Joined: May 27 2018 11:54am

Re: MH RYZ (derbi 50cc)

Post by guiga » Mar 19 2021 11:19am

Batteries fron Nkon.nl are here. Tested voltage and 160cells come with 3,47v and 40 cells come with 3,46v. Very good quality.
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Attachments
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hugok   10 mW

10 mW
Posts: 22
Joined: Mar 05 2021 5:40am

Re: MH RYZ (derbi 50cc)

Post by hugok » Mar 19 2021 2:11pm

Nice! What is estimated price per kwh for those cells?

guiga   100 mW

100 mW
Posts: 45
Joined: May 27 2018 11:54am

Re: MH RYZ (derbi 50cc)

Post by guiga » Mar 20 2021 1:12pm

Got 200+2 cells for 990,79eur with postage for a 20s10p (2880w nominal)

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jhoexp   10 mW

10 mW
Posts: 29
Joined: Jan 12 2017 10:08am
Location: Torino, Italy

Re: MH RYZ (derbi 50cc)

Post by jhoexp » Mar 21 2021 4:42am

guiga wrote:
Mar 20 2021 1:12pm
Got 200+2 cells for 990,79eur with postage for a 20s10p (2880w nominal)
Just less than 5 euro each cell, that makes almost 350 euros per kWh. Pretty expensive!

I was considering buying 300 Samsung INR21700-50G for 4 euros each. That would be less than 230 euros per kWh.

guiga   100 mW

100 mW
Posts: 45
Joined: May 27 2018 11:54am

Re: MH RYZ (derbi 50cc)

Post by guiga » Mar 25 2021 1:13pm

Start building the pack. Lithium aint joke so guys be carefull.
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larsb   10 MW

10 MW
Posts: 2057
Joined: Dec 10 2014 5:12am
Location: Gothenburg, Sweden

Re: MH RYZ (derbi 50cc)

Post by larsb » Mar 25 2021 2:41pm

guiga wrote:
Mar 13 2021 2:02pm
Hi there , will be a 10 front sprocket wit 59 tooth rear sprocket so will be a 1x5.9 gear ratio on a 17 inch wheel.
What you guys reckon? bike under 70kg with a qs 138 4kw motor , kelly kls 7250 400 phase amps and 20s10p 21700 samsung batteries.
I notice that the controller only comes with a 150amps slow fuse so may not be so strong???
you’ll need a bigger controller for max performance, i have been running the smaller QS 138 70H at max 300A battery / 450A phase and 1:8 gearing and it’s a blast. Given that the 90H motor has roughly the same kV but higher max torque means that to utilize it you need higher phase current.

Seems counter intuitive but torque=(9.55/kV) x I so same kV motor and same current gives same torque even when comparing a smaller and a larger motor size (if smaller motor is not saturated). Scale phase current with the difference in stator width at 450*90/70=580A, so a 600A phase current controller would suit this build well. ASI BAC 8000 would be interesting to see, or the matched Votol EM-200.

guiga   100 mW

100 mW
Posts: 45
Joined: May 27 2018 11:54am

Re: MH RYZ (derbi 50cc)

Post by guiga » Mar 26 2021 3:40am

Thanks for the info my friend. The controller i got is the kelly kls 7250 n witch is 380amps probably phase amps. Been tweeking the controller and is very responsive now. I also got a asi 8000 from other build but cause the asi was from alan , got no credentials! What do you think about this idea for the battery? Maybe still need to solder also.
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larsb   10 MW

10 MW
Posts: 2057
Joined: Dec 10 2014 5:12am
Location: Gothenburg, Sweden

Re: MH RYZ (derbi 50cc)

Post by larsb » Mar 26 2021 6:16am

Sad to hear that you also have the ERT issues. Controller will be useless without update and it’s not cheap..

Battery looks good, your spot weld energy is a bit too high, it’s almost breaking through the strips.

before soldering i’d load the battery with some high current and calculate the internal resistance, then decide.

hugok   10 mW

10 mW
Posts: 22
Joined: Mar 05 2021 5:40am

Re: MH RYZ (derbi 50cc)

Post by hugok » Mar 26 2021 7:33am

Looks great! Could you describe the issue with the asi 8000? Isn't there a way to fix it? Sounds a bit sad to have a useless controller when its just a software thing.

larsb   10 MW

10 MW
Posts: 2057
Joined: Dec 10 2014 5:12am
Location: Gothenburg, Sweden

Re: MH RYZ (derbi 50cc)

Post by larsb » Mar 26 2021 9:33am

When buying ASI from electric race technologies/ERT you don’t always get a password for the controller program so it’s effectively a bricked controller if you need to update something, at least that’s what i’ve seen described here on ES. Sucks.

hugok   10 mW

10 mW
Posts: 22
Joined: Mar 05 2021 5:40am

Re: MH RYZ (derbi 50cc)

Post by hugok » Mar 26 2021 11:50am

Shouldn't it be possible to just download new unlocked software to it? Ask ASI for unlocked software?

larsb   10 MW

10 MW
Posts: 2057
Joined: Dec 10 2014 5:12am
Location: Gothenburg, Sweden

Re: MH RYZ (derbi 50cc)

Post by larsb » Mar 27 2021 7:04am

For that you’d need an understanding customer service..not sure that’s ASI:s strong point.

guiga   100 mW

100 mW
Posts: 45
Joined: May 27 2018 11:54am

Re: MH RYZ (derbi 50cc)

Post by guiga » Mar 30 2021 12:37pm

Been busy and also waiting for new soldering iron . 200w. Still more parts to come.
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guiga   100 mW

100 mW
Posts: 45
Joined: May 27 2018 11:54am

Re: MH RYZ (derbi 50cc)

Post by guiga » Apr 24 2021 10:20am

Its alive! Had to change front suspension , dint like the pit bike suspension.
Have install a contactor and a pre charge system.
BMS display had a small fall but still works.
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B1078   10 mW

10 mW
Posts: 24
Joined: Apr 24 2020 4:57am

Re: MH RYZ (derbi 50cc)

Post by B1078 » Apr 24 2021 1:20pm

guiga wrote:
Apr 24 2021 10:20am
Have install a contactor and a pre charge system.
BMS display had a small fall but still works.
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I ordered the same delay timer! What precharge resistor(s) do you use? Or a little schematic, so I know I'm on the right track!
Nice build by the way!!
Ultra newby Honda e-gorilla build:viewtopic.php?f=12&t=105862
B1078 on Instagram for small updates and side projects.

guiga   100 mW

100 mW
Posts: 45
Joined: May 27 2018 11:54am

Re: MH RYZ (derbi 50cc)

Post by guiga » Apr 26 2021 10:17am

Here my shtty schematic lol but good enough for you to have a ideia how it works. This group is for sharing and help so i will do my best.
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guiga   100 mW

100 mW
Posts: 45
Joined: May 27 2018 11:54am

Re: MH RYZ (derbi 50cc)

Post by guiga » May 03 2021 4:01pm

It runs. Had to turn aceleration ramp down to 20 in kelly controller cause was way to wild , i just couldnt ride the bike witout spinning and lifting front wheel from start lol. Just need some minors astetics to be finish.
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EVOXY6768   10 mW

10 mW
Posts: 28
Joined: Jun 28 2020 9:31pm

Re: MH RYZ (derbi 50cc)

Post by EVOXY6768 » May 03 2021 4:40pm

Your build has come out real good. Can i asked how do you fit the 10t front sprocket ,its a taper shaft on your motor ?
Cheers.

guiga   100 mW

100 mW
Posts: 45
Joined: May 27 2018 11:54am

Re: MH RYZ (derbi 50cc)

Post by guiga » May 04 2021 1:37am

EVOXY6768 wrote:
May 03 2021 4:40pm
Your build has come out real good. Can i asked how do you fit the 10t front sprocket ,its a taper shaft on your motor ?
Cheers.
Hi , the sprocket is a lill bite wider and yes is tapered but it works good enough. Its from a UK store , search for MightE. Some other good stuff there also.

B1078   10 mW

10 mW
Posts: 24
Joined: Apr 24 2020 4:57am

Re: MH RYZ (derbi 50cc)

Post by B1078 » May 06 2021 1:13am

guiga wrote:
Apr 26 2021 10:17am
Here my shtty schematic lol but good enough for you to have a ideia how it works. This group is for sharing and help so i will do my best.
20210426_161500.jpg
Thanks for the schematic!
Ultra newby Honda e-gorilla build:viewtopic.php?f=12&t=105862
B1078 on Instagram for small updates and side projects.

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