1800w 48v 30mph Razer Dune Buggy Go-kart Project Vid. 2
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- čas přidán 1. 06. 2024
- Hi everyone!
Enough people watched my previous video for me to go ahead with this one. I did a lot more editing, audio, and visual work (most of which you probably wouldn't notice) which is why this was so delayed. I was also getting used to the free version of DaVinci Resolve video editor.
Specs about the modified gokart:
48 volts @ 33 amps = ~1584 Watts (rated 1800Watts)
~30 mph top speed (confirmed 27mph with dragy GPS)
Four 12v, 7Ah Lead acid batteries wired is series
Almost everything bought on amazon
Feel free to ask questions and leave comments. I reply to everyone.
Previous Video: • 1800w 48v Razer Gokart...
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Time Stamps:
0:00 - Intro
1:02 - The things I did
2:28 - So yeah, done.
10:04 - Fit and Finished
12:07 - The Drive!
14:50 - The Dirt and Ride
16:25 - The Batteries
17:24 - Later - Auta a dopravní prostředky
That does look a lot of fun
And that thumbnail has the drip. I like it; Picasso
Thanks mate, it's a beauty aint it.
I have a home built etrike that I love like my mama, and that I use as my wheelchair. I also have a brand new 5 hp electric lawnmower I would like to do something with but it's made to plug into a 110 outlet. Will it still work with batteries at 48 v ?
That sounds like a really cool e-trike but I can't really help you with the electric mower. Unfortunately, there has been a lot of variety in e-mowers over the years when it comes to batteries, plugs, connectors, motors, and control systems.
It would be pretty cool if you could take the blade motor and/or drive motor/s and make them into a go-kart or something. Food for thought.
Great project, how many hours does the battery lasts?
7ah 12V lead acid are very small batteries (@ 30amps discharge that's an unrealistic ideal 14 minutes of usage). The batteries last 5-15 minutes on a full charge. They take 2 hours to fully charge from dead. So far, the batteries have slowly degraded over the course of 5 years.
Your the only person ive found using the same motor as me and i was wondering If i add more amps to the kart would it be able to go even faster? As you only have 7amp and 48volts, if i made mine 48v and 20amps would it go alot faster?
....Kinda, yeah. Yes. Yup. Probably. Sorta.
I need to clarify some things first. Amps (Amperes) tell you how much current is flowing at a particular instant, while Amp-hours (Ah) provide a cumulative measure of the total charge that has passed over a time period (i.e., battery capacity). In my case, I used a small 7 Ah capacity battery that just barely output the required constant 30 Amps for the motor on a full charge. That is why the battery voltage drops so much in my video. If you use a more powerful battery, like a LiPo battery, at the same capacity, it will not have this problem because those batteries are rated for +30 Amps of continuous discharge. Alternatively, if you use a larger battery, like 20 Amp-hours, it will also solve the problem.
Next, we need to talk about how voltage affects motor speed. The current supplied to the motor is generally tied to the torque of the motor, while the voltage is tied to the top speed of the motor (this is a generalization). My cart has just enough power from my batteries, on a full charge, to reach the maximum motor speed. It is not very torque-limited. That means if I were to increase the Amps (and therefore torque), I would not see a large increase in top speed. That being said, it would make my cart faster going through grass, up hills, and much faster accelerating. If I want to increase the top speed when torque is not the limiting factor, I should increase the voltage.
Finally, we need to talk about the limits of the motor and speed controller. The speed controller is "rated" for 30 Amps continuously at 48 Volts. The speed controller has a hard limit on the current it can supply, and it cannot exceed 30 Amps. But as far as I know, there is no voltage limit to the speed controller; it will just explode after too much voltage (around 100 Volts or so). The motor is very capable and can handle up to 72 Volts or even 90 Volts with proper cooling (you will need cooling!). If I do go that route, at 30 Amps and 72 Volts, I might see speeds over 45 mph.
@newwing7607 alright that helps alot for my journey of building a gokart thanks
you have 7ah battery still got all that speed, but can it or even 15ah get the motor to its limits? maybe requires 20ah to push it to limits, what do you think like even a lot of 20ah batteries says "max 1000w motor"
Hmmm... where to start... Different battery chemistries will have different capabilities for output. The series of four 12V 7ah sealed lead acid (SLA) batteries are currently discharging the equivalent of a 5C battery (around 30 amps). The maximum recommended use case for the battery is 0.3C or 2.1 amps (15X lower). This means the SLA's are very VERY stressed out, but because they are lead acid chemistry they are more resilient to these extremes than some lithium-ions.
Now, if we take a look at lithium-polymer (LiPo) batteries, a lot of them are rated over 30C. Meaning I could even make a 2ah battery pull 30amps no problem.
If we turn our attention to the motor; hall-sensor 3 phase DC motors (what I got) are very resilient. The limiting factor is usually cooling. I could probably run like over 4000W of power at 60amps and 72V if I have a speed controller that can handle it. It would definitely overheat, but if you could cool it it would probably work... probably... at least once...
In my case, the limiting factor is hard to tell. My batteries only last 5 minutes more or less. But the speed controller is hard limited to (a claimed) 33amps so who knows what power it needs to reach it's limits. I'm pretty sure the controller will break before the motor though.
To answer your question: a 20ah lithium-ion battery is probably just enough for my setup. (Different chemistries are capable of different outputs) most cheap e-bike batteries are 1C continuous output. Some better or worse. Your results may vary.
Yo, i have 110cc kids quad im turning into a ride on cooler. Would u reccomend that kit for that project?
It depends on your project. The kit might be a little bit underpowered for off-road use (my go-kart tops out at around 15 mph when in tallgrass). There are a lot of factors that goes into what you're looking for. If you're okay with that speed and lack of future proofing, I'd say go for the kit. It's been pretty good.
If you want to do an electric swap but have the same and/or more power than the 110cc engine, like 6 to 8 horsepower, then you're looking at at least a 3,000W kit.
You also have to realize that I cheaped out on the batteries for my project initially. The sealed lead acid batteries lasted a good 3 or so years but now I need to replace them and a proper lithium battery pack is not cheap.
guy about the gears what would be the measurements?
The gears I am using are for the original size chain for the go-kart (#25 chain). The gear setup I have is a 13 to 33 tooth, then to 15 to 33 tooth (if my memory is correct). So, the total gear ratio is 1/5.585 wheel-speed to motor-speed. The 33 toothed sprockets came with the go-kart, I needed to get the 13 tooth sprocket to adapt my motor to the small chain size and the 15 tooth happened somewhere along the way. I also have a 9-tooth sprocket I want to put on just to see how fast I can break my back accelerating. 🤣 If you want to do the math, my tire diameter is ~11in and the motor rpm limit is stated to be ~5200 RPM, so my theoretical max speed is around 30.5 mph. I usually see around 25mph but have confirmed up to 28mph.
Unfortunate, I don't know the exact gear specs and it's annoying to take them off just to see if they have any manufacture numbers. I'll make another video of it if you ask nicely. Hope I could help, and let me know if you got any more questions.
What is he fastest you got using the 7Ah battery ? thank you
Well, I literally just ran my Dragy GPS performance data recorder to see the top speed. It is officially 27.05mph. Voltage dropped from 52V to 44V.
When the batteries were new, the average voltage sag at top speed (right off the charger) was around 4-5 volts. Now it's grown to 8-10 volts. These batteries were not made for high current draw.
thank you so much man, idk if it's weird or i don't have enough information but 7ah getting you 27mph max speed is very good@@Newwinggarage
I put exact same motor in my son's. Those drum brakes are horrible. Can't stop worth a shit
I 100% agree with you! The tiny brake rotor and pads struggle to get kart to stop. After I adjusted them as much as I can, the plastic brake handle still flexes to much for the amount of squeeze I need to stop quickly. That being said, if its wet, on dirt, or grass, the tires will lose traction before the brakes reach their limit. To be honest I'm a little surprised that the brakes actually function with the increased weight and speed.
i see a lot of people who uses the same motor and controller but their controller burns, did that happen to you before? i really wanna avoid that since my budget is low
My personal experience is that I have not had a controller failure. I have noticed that both the speed controller and motor get warm under prolonged use in the highest speed mode. At the moment, my batteries are the limiting factor, so the controller is not outputting at 100% at all times. I could very easily see the controller dying without proper cooling when under prolonged heavy loading. (Then again I am only a sample size of one, so your results may vary)
If enough people are interested, I will add more power/volts and see where the controller dies. (It's a pretty cheap controller)
that would be cool, i have another concern if you don't mind, i will buy the 48v 1800w motor and thought about buying 48v 15ah battery but the seller told me it would make the motor go little weak not full power, and maybe 20ah would make it full power is that right?@@Newwinggarage
hey where did u get the upgraded big wheels
Yay! Somebody noticed!
So, there's actually a long story about these larger rear wheels. The short of it is, they are 12-in pneumatic tires and 6in rims that can easily be found online for around $30 each (I bought them a long time ago and don't remember where). - you can find them at harbor freight
I had to buy 20mm metal turning drill bit, then drill to match the diameter of the wheel hubs to go-kart axle. It was a bit of a hassle but worth it.
Let me know if you would like any further details, or have any questions!
Hi how long does the battery’s last ?
5-15 minutes of constant driving. Depends mostly on how much accelerating is done.
@@Newwinggarage that’s it ? I was going to make one but 15min is not very long lol
What motor sprocket did you use?
I ordered an 11 tooth sprocket for 25H chain. They are very cheap and pretty universal. The one that came with the motor kit was of a different size.
@@Newwinggarage and you used the stock gear reductions?
@@DescartesRenegade Kinda. I used 3 of the 4 stock gear sizes. My current gear ratio is 11-33 to 15-33 (there are two gear reductions). The normal gear reduction is two 11-33 gears. My wheel diameter is ~12 inches, so 5200rpm motor speed = ~28 mph.