Large homemade scooter

Scootdan

100 W
Joined
Mar 19, 2021
Messages
113
Here are some first pictures of a semi working mock up of my latest scooter for your enjoyment. I have been rolling this monster around my ‘shop’ and it is quite awesome. Just getting everything placed and finalized, which I find so fun! Already I will making some changes, so I won’t dress it all out now. Mainly I am making the wheelbase shorter, from seven feet(!) to six feet four inches. I am hoping for a fast, comfortable and very powerful scooter. This machine has two 96v 12kw motors, two APT 96600 controllers, and a 72v 35ah 100a 6000w lithium battery. I am hoping to run a 100v battery, which I left extra room for, later if possible. I would love to try and max out the 300a these controllers can handle. Also that is the only readymade battery I have found that will give my motors 12kw. I am just learning about batteries so please overlook any glaring stupidity on my part guys. I am loving building this baby and any help, encouragement, and good advice would be really appreciated my brothers and sisters, especially on the best batteries for this application. More pictures, hopefully riding soon
Ps. A little trouble with my pics. Please bear with me. I will share pictures of another monster scoot and be right back with my pics.
 

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Here is my sled. Thanks for looking.
 

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Now it has a 6’4” wheelbase and I think it is just right. This thing is serious fun. I am going to try to hook it all up and maybe go for a little test scoot. Could be dangerous! I do need to invest in a real helmet when this pig hits the streets. Man I can not get over the look of that big front tire, but these pictures from our porch just don’t do it justice. I hope to get better ones soon. Thinking of a mechanical or push button kickstand maybe to stay standing when stopped, like at stop lights. Just thinking out loud….
 

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That scooter is cool man, what is the steerer tube like a white pvc pipe?
 
Ok I covered the pvc for you brother Calab, and thank you sir. Got the front brake working and my wires run, time to jump on it and push it around. Man I can’t wait to take off for real on this beast. I guess I am easily amused! :thumb:
 

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Man I am having way too much fun with this scoot. Both wheels are spinning with power now. I am so tempted to ride it with power. Yikes.
 

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MOTHER OF GOD!!

It's a beast :bigthumb: :bigthumb: :bigthumb: But i'm worried about safety? Does it have a steel structure, is it just plywood?
 
I somehow like the build but I can’t figure out the goals you had with it :wink:
It seems there is an overcapacity on motor/controller side but undercapacity on battery. The build doesn’t really seem like the best candidate for drag racing either..
 
craciunptr said:
MOTHER OF GOD!!

It's a beast :bigthumb: :bigthumb: :bigthumb: But i'm worried about safety? Does it have a steel structure, is it just plywood?

:bigthumb: Thank you very much for excellent reaction brother, that’s what I am looking for! 8) This is a partial Mock up, and most of the body and framework is a combination of carbon fiber, aramid, s glass, aluminum, and even a little steel. I am making it as light as I can afford on a shoestring budget. The plywood and PVC are just MOCK UP and will not be a part of the final scoot. Even this mock up I could jump up and down on, thanks to the metal strap, and even ride by pushing! I am building it to handle much more battery power, like 20kv to 50kv. But I will be happy to learn how to ride it as a very heavy and underpowered big super cruiser scooter. I am within about a week to first trying powered rides I hope so stay tuned. :bolt:
 
larsb said:
i'd guess it's just a mock-up of what's to come - still i doubt the mock-up.

slap a 50kW battery on there, then it's ready for the streets :D

Hello brother larsb, good to talk to you again. You really helped me with these APT controllers about a year ago. This is a weird combination of some finished parts and some mock up and some molds for future surfaces. It is meant to be my Dualtron scooter, but 2 1/2 times the size wheels and body, with lots of power and plush suspension. I am starting low power to see how it handles and work out bugs before going 50kW though! I currently have 12” x 4” x 20” space to pack with the most power I can manage to get. I will add some pics of some of the more finished parts, especially the front end, to address your doubts brother. I can tell you it was pretty thrilling just push riding this beast. I am thinking powered rides will be awesome. With more power maybe even 2 people can ride. Best regards. :thumb:
 
Scootdan said:
I am building it to handle much more battery power, like 20kv to 50kv.

I suspect you're using the wrong term; I doubt you will want to use 20 thousand volts to 50 thousand volts for a battery pack. ;)

You might mean kW (thousand watts), but if you did have that much power available you may only see that for an instant during startup from a stop unless you're climbing long monster slopes or drag-racing it. ;)
 
amberwolf said:
I suspect you're using the wrong term; I doubt you will want to use 20 thousand volts to 50 thousand volts for a battery pack. ;)

All the cool kids are using 10000S 1P packs these days. Get with it!
 
I suspect you're using the wrong term; I doubt you will want to use 20 thousand volts to 50 thousand volts for a battery pack. ;)

You might mean kW (thousand watts), but if you did have that much power available you may only see that for an instant during startup from a stop unless you're climbing long monster slopes or drag-racing it. ;)
[/quote]

Yes I am probably pretty good at using the wrong term Mrs Wolf, because I know very little about this stuff! Thank you for helping. I think I meant kW also. My motors and controllers are rated at 96v but I read that many people run a little more than the ratings with no problem. Many ebike motors and controllers are 48v but run 52v batteries. I found a 100v lithium battery I was told would work with my set up, but now I hear lipo is more power dense, so hope to learn more about that. Hopefully I can ride my big scooter as a docile under powered puppy until I see what kind of juice it might need, or I might be able to handle! I would love the capability to fly up monster slopes and drag race all over the place with monster control and monster comfort. Hopefully I can get it some kind of street legal. That would be epic. :D
 
Elektrosherpa said:
I hope you won't kill yourself with that vehicle.
8)
Yes me even more brother, thank you. I am hoping I survive the fast 2wd ebike I just finished also. Definitely dangerous on our streets. :|
FOUR front fork legs (apparently metal),
but a steering stem made from a PVC tube?
The PVC was just a mock up to help determine size, etc.. here is the real steering tube and the PVC temporary mock up.
I do not understand the thought behind this proportion...
Hope that helps. Hopefully more soon. :thumb: D2439A03-87DA-4CB0-BEFB-A3F6BF7E8657.jpeg2280D56B-4230-419D-8393-9A592AD1B3AD.jpegC134B8C8-6347-42B5-9A3E-1547FEEDF581.jpeg
 
Scootdan said:
My motors and controllers are rated at 96v but I read that many people run a little more than the ratings with no problem. Many ebike motors and controllers are 48v but run 52v batteries.
The latter is quite a different thing than the former, because most of the stuff for 48v (13s) has 75v-80v parts in it, at least, and some 100v parts. For 13s (or 14s) even the cheap stuff doesn't usually have parts intended for only a few volts above it's fully charged voltage (54v (or 58v)), though that has been the case when 14s was not common, where they might have 60v FETs and 63v caps.

Are your controllers rated at 96v maximum? Or are they rated for a 96v battery pack? If the former, then you should not exceed that, because if it has only 100v parts in it, pushing past those limits may cause failure at any time and will probably happen at the worst possible moment (because those usually happen when pushing things to their max).

If the latter, then if it's based on the typical Ii-ion pack 96v / 3.7v = 26s; I'm not sure how common that would be (24s *is* common, but that would be an 88v (or 89v) pack, 100.8v fully charged, and it would need better than 100v parts (probably 150v parts) to ensure it has margin to prevent sudden catastrophic failure.

If you run at the ragged edge of what something is rated for, you run a high risk of sudden catastrophic failure. With controllers, the most likely failure parts are the FETs, whcih tend to fail shorted, which will then be shorting out your motor phases, which turns the motor into a giant brake...if you happen to be going fast in traffic when this happens, best case you may skid out and crash into whatever is in front of you; worst case you could endo and flip or you could skid out and get run over by traffic from behind. In other situations there are probably equally bad consequences.


People do it...but you should understand the risks--it could kill you, or someone else (as unlikely as it is...it is still possible).


I found a 100v lithium battery

Is that 100v fully charged? Or a "100v" battery? The former is really an 88v battery, as above. If the latter, that would be a 27s or even 28s battery, which would actually be up to 118v full charge.

Using a pack that high a voltage on a 100v controller would probably destroy it pretty quickly, if not instantly.


but now I hear lipo is more power dense,
If yo umean RC Lipo, it might be, but it is also frequently zero-QC (with notoriously catastrophic failure modes) and has a much shorter lifespan especially when used hard. Often rated much higher than it can actually handle realistically ("100c" for what might really be a 10c or 20c max real capability, for instance).

Your battery is the heart of your whole rig. If you don't build the system around the battery and it's capabilities, then you need to figure out what you want teh system to do for you, and what that system will take in power to do that. Then you should build a battery that is more than capable of supplying that power, with a good margin over that to account for aging over time, so it won't only be able to do the job you need when you first build it, and can continue doing it for the life of the vehicle.



Hopefully I can ride my big scooter as a docile under powered puppy until I see what kind of juice it might need,
Use the motor simulator at ebikes.ca to see what you actually need, in order to do the job you want this to do for you. Then you can figure out what it will need without having to buy controllers and batteries and such that don't do what you want over and over again until you eventually get something that does. Will save you a lot of time and money. ;)




Hopefully I can get it some kind of street legal.
YOu'll have to check your locality's laws on DIY vehicles, and then on whatever relevant class it is covered by (if any--it may be of a type of vehicle, because of crappy legal wording and descriptions in the laws, that simply can't be allowed on the roads at all, or even be flat out illegal...for instance, there are places that recumbent bikes are not legally bicycles because the definition there specifies one must ride astride a saddle...and the 'bents typically don't use saddles...there are other such instances of wording that makes some commonly used things not legally what they actually are, and some actually made illegal by other parts of the wording).

I'd recommend doing this before you go further, so you don't end up with a ticket and your creation siezed / impounded. ;)
 
Thank you very much amberwolf. Lots of good information there I can really use ma’am. I appreciate your patience as I relearn how to ‘quote’ properly! I will have to learn more before I understand all the terms your using about batteries. I will try to answer what I can now starting backwards. Getting street legal - would be great but not necessary, I can always ride on private property if needed. Number 3 rule -No seizures or impoundments! Juice needed - ebikes simulator. Great tip I will check it out.
Lipo- yes I think I mean rc lipo batteries- polymer? I know they can be dangerous, but treated properly they sound like what I want, more power, less weight and size. Battery super guru Luke says if I follow the three golden rules of lipo I should be safe.
100v battery- it is a 100v battery. I think it charges to 110v, but 118v would be even better.
Controllers- I am not exactly sure ma’am but my controllers say they have over voltage protection to 140v for a 96v battery. I know they are considered ‘high powered’ for small motorcycle use using one, and I am running two. I had to set them at 100a to match my small 72v battery. Normally they are set for 96v battery and 300a. So I probably really want a 96v or 100v battery with a 300a BMS? Again I need to learn more to understand your (and Chalo’s) terms ma’am, but I really REALLY appreciate your help and expertise amberwolf.
 
Quick update, getting ready to ride! :thumb:
 

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40+mph! Yes! I am so excited about this scoot guys. It is, very unexpectedly, a total stealth vehicle sound wise. Almost completely silent. The ride is just sick smooth and the brakes are absolutely next level control. My first rides were at half battery and it did 30mph! which I thought was fast for a small 72v battery. After a full charge, to 84v, the lead sled just did 40+mph and was still gaining. I am very happy to learn how how to ride this beastie first with this small battery. Later when I am more proficient I can stuff it full of lipo and see what she will really do! If your interested in a serious stand up get your order in now! I just saw a new stand up snowmobile that looked great too. I hope it is electric. Thanks again for all your help and knowledge guys, especially you amberwolf. I really hope I can get street legal now! :bigthumb:
 

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I think this is the world’s quietest scooter. [youtube][https://youtube.com/channel/UCvTLuu3y0VRnxlLN5Az9dGw/youtube]
Please visit and subscribe and we will have some very cool videos for you guys very soon. The seat on the back is just mock up for fun. :thumb:
 

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If you do end up actually needing a folding seat for it, I highly recommend the Stadium Chair. (not the clones...the actual brandname one that you can get off their website).

Steel frame, good tough seat and back material; easy to disassemble for modification or repair, and a good company to deal with (they replaced my chair for a torn seat fabric, even though I bought it used and it had lasted me a while before tearing, and I'd only contacted them to buy another seat fabric!)

I bolted mine to the SB Cruiser's seatbox; it does what I need it to, which is give me a bit of butt-suspension to remove road vibrations (I have no suspension).

It'd be easy for you to make a couple of brackets to put the seat frame on, and it can fold up and away if the brackets are hinged.

They make a wide version; I use the narrow one, but have a wide seatback cloth to experiment with relacing the narrow seat on a modified narrow frame to widen it.
 
Thank you very much Mr. SlowCo. I am having so much fun riding this beast and seeing what she will do. This morning I rode a little over 14 miles just around my neighborhood and it was absolutely amazing. I wish I could record people’s reactions brother. I got so many thumbs ups, and “good job!”s, and point and smiles, you really feel like rockstar on this monster! And of course, what I really love- Look Mom, no gas! :bigthumb:
 
That looks insanely dangerous, but well done on the build!
I can't imagine how it would be possible for anyone to control that thing at full speed with such powerful motors and controllers though. :lol:
 
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