Thats a good idea. Ill think about that when I upgrade the battery

lol yeah 😂

Nice work!

Surprisingly the battery's don get hot at all but my motor does. I need to get some cooling fans on that

@@Kevin.OBrien44 i know next to nothing about all this but it seems like so.e kind of air capture cooling is possible. The faster you go the more air is provided to the motor. Finding the correct soze and shape might be more r&d than warrants it

@@nateb4543 Yeah. air cooling would work on the motor, I might try to add a air duct to it for cooling if needed

Yeha that sound like a great idea. Ur just going to have to use slightly smaller motors because mine weighs 45 pounds. Maybe something around 20?

Ok yeah I’ll try to make it more equal next time. Lol it’s hard cuz my phone is my mic so it’s already bad quality

Thanks man. Im going to try to get part 3 out sooner this time!

Thanks bro

Yeah lol, Ill work on the eq for the next videos

No the battery can do over 300a. I'm bypassing the bms for discharge.

I got them from BatteryHookup.com and I just looked at the spec sheet to make sure they meet my requirements

It will degrade around 20% every 1000ish cycles is what I heard. And I get around 20 miles of range driving slow and 10 miles if I push it as hard as I can

true😎

Yeah mine goes 55 right now and im getting new sprockets for better gearing. I would go with a higher voltage hindsight, maybe past 100v

Yeah I’ve been doing some testing and mine drop to 2.8 when under ~600a. I might build a bigger/ denser pack down the line. So it’s more like 40kw but it can always grow lol

@@Kevin.OBrien44lol no it's not, you'd be lucky if that was 4kw. It's probably closer to 1kw at peak.

@@smoothbraindetainer so my kart runs at 70-80v. When I am driving it around how many amps would you think are coming out of my battery pack?

​@@Kevin.OBrien44 Let's assume BEST case scenario. 20Ah, with 20C max discharge, which at 80v (probably closer to 60v after voltage dip), is 32Kw (24Kw) before your batteries do not nice things. Of course that's assuming 100% efficiency. At the discharge rates that would require, and the added heat because of it, you'd be lucky to get 80% from the battery. At first I thought those were standard lithium batteries which have a discharge rate of about 1/10-1/20 those, so i'll admit my estimate was off by about that factor, but that's all *battery side*, you're still very much limited by the motor. If you've got a model for the motor that's the easiest way to tell here, but with the weight of that kart it's definitely not 40kw as you'd be competing with supercars for a 0-60. Get it on a dyno for part 3 if you can, it's a fun project but I think a little optimistic in terms of power.

​@@smoothbraindetainer Well on the battery side these cells can do 50a continuous and 120a peak for 10s which would mean a peak output of 960a, which means my battery is not bottlenecking the power in any way. I have a clamp meter and measured ~450 amps only because I'm still woking on my gearing but when I get the right ratio the motor will pull more amps, making it closer to 40-50 kw. And yes it does have close power to weight ratio as a supercar weighing in at only 247 lbs. Again its top speed is limited to my gearing issue, but does have a 0-40 time of ~3 seconds. Im trying to get it on a dyno as well like u said

About 1800 so far I think. Hopefully soon, I've just been caught in school work

It is a 24s8p 20ah. I’m working on measuring it right now but I think it does 600 amps and sags down 68 from 80

Sick! im exited

@@Kevin.OBrien44 I got them. Might just keep them gas for a bit until I find the right motor. How did you source your motor? Thats the kind of power I want lol.

@@AllThingsElectric_ look for used brushed series wound motor if u wanna be cheap. You can look up forklift motor on ebay and some will come up. if you have more money you could buy a brushless motor but those are only really available new so there more expensive

@@Kevin.OBrien44 what are the specs on your motor?

@@Kevin.OBrien44 they all are super low voltage and HP

Its from an electric forkift. I got it off ebay used for like 300$

It is a used forklift motor that was 250$. It is great if ur cheap but if you want longevity run an ac motor

yeah idk why in just swing this but i did a few test with an amp meter and peaked at like 500 amps but only for a few seconds. continuous i did around 200 amps but i’m not sure if that was discharge limited. if i had to guess that’s just how much power the motor wanted

For DC motors If you want to have variable speed you need a controller and for AC you need one no matter what. An alternator is AC so your gonna need a controler

@@Kevin.OBrien44 thank you very much!

Yeah that sounds sick! these motors aren't that expensive if you can find them used or in scrap.

Im only using the bms for charging. The discharge is completely uncapped. these cells can do a 10 second burst of 960 amps. www.batteryspace.com/prod-specs/6610.pdf

From batteryhookup.com

The motor was used and came off of an electric forklift and was rated at 5kw

YESSIR

Fax

😂 yeah it was just my aerospace engineering class. Nothing I don’t alreadly know lol

yes it only rated for 260 continues but its 650 for one minute. you wouldn't even be able to put a 650 amp load on the motor for that long because after 3 seconds your already going 40 mph and the load on the motor has decreased to half of what it used to be. The continuous rating is less applicable to this scenario than the burst rating. the motor would also probably melt before the esc stops outputting 650 amps.

Today

Lmao didn’t even relieve I said that

it’s a kelly controller 650amp 72volts. i forget the model name but it’s something like kdz72650

No brand. It was from an electric forklift. I bought it used off ebay so I dont have any specific info on it.

charge in about 5 hours and runs for about 10 miles driving fairly hard

@@Kevin.OBrien44 Thats half hour per mile, pretty descent for its horsepower but, can the charging time be reduced somehow?

It’s a hall sensor for 1-4 volts. I’ll go over that in more detail in the next video

www.ebay.com/itm/Electric-Scooter-E-bike-Bicycle-Thumb-Throttle-Grip-Switch-Voltage-LCD-Display-/353238314955?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l6249&mkrid=711-127632-2357-0

80v and up to 650 amps. but the voltage will sag to 65ish under load

You should use the SPIM08HP batteries on battery hookup

With the gearing in this video 42 but that only pulls half load

kzfaq.info/get/bejne/pshol7mVkpzNm3U.html

Hopefully within a week or so

The batteries I bought we’re already in a pack because I bought them used. I just had resize them to fit on my kart. Look up a123 anr26650 pack on eBay to get similar cells

@@Kevin.OBrien44 thanks

@@Kevin.OBrien44 also what is the max rpm of the motor?

@@samfriday3437 I have it at 3500 rpm. But what might be more useful is the KV which is ~50

I think it started with my FPV drones that got me into technology and that sort of engineering aspect. But basically all of my knowledge comes from my personal experience or youtube/internet articles. Thanks for watching

It is made by dodge and thats all I know. I repurposed it, this is one just like the one I have www.ebay.com/itm/362407266229?epid=1919241409&_trkparms=ispr%3D1&hash=item54612807b5

@@Kevin.OBrien44 What BMS/Balancer did you use for your system? Thanks btw

Hopefully soon. I’ve been really busy with school

That was an old battery so it didnt matter. It worked well for me so whatever

I bought the motor of of eBay and it was used. The controller I bought directly from Kelly controllers

Lol yeah

its out in a couple minutes

I just got a gpu yesterday so now I can finally edit it now lol

its out in a couple minutes

@@Kevin.OBrien44 pog

Yeah i found a good deal on batteries so i went for it

Lol it’s a clone😅 I wouldn’t scam you like that

lol that would be hard. maybe in a few years

Thanks for the tip

@@Kevin.OBrien44 Keep it up mate!

@@rever4217 I tried to make the volume better I'm my recent video. Tell me if it worked

​@@Kevin.OBrien44 Hey man I just watched it, the music volume while you're talking is much lower which is great. However, the music in between your talking is still really loud compared to your voice so I find myself constantly increasing and decreasing the volume so I can both hear you and not get my ears blasted between talking segments. You should either raise your voice or decrease the music. Other than that great build! I've many questions as I'd like to try build my own but for now I'm confused why you built a 80V 20Ah battery (24s8p @3.3V 2.5Ah cells if I remember correctly?) when your motor is rated for 48V 300A (I think it was?). If your motor's rated for 48V why not just build a 48V battery pack? Is there any advantage to using a higher voltage battery pack?

@@rever4217 basically I did it to get more power. Power is voltage x amperage so increasing one of the 2 yields more power. The thing is though, when you increase amperage the motor quickly overheats. But when you increase voltage there is little downside because the extra voltage doesn’t heat up the motor. It only increases the rpm which could destroy the motor if it spins too fast but this is unlikely. So basically you can run a higher voltage with little risk but big gains in power. Especially with a motor like this