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  #1  
Old 10-30-2012, 04:45 PM
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Default Road Legal StreetQuad conversion

Hello!

Been lurking this awesome forum for nearly 2 years now, gathering information about all the components for a conversion and I think it's time to slowly get started on my first project.

First let me introduce myself. My name is Rob, I'm almost 24 years old and I live in the Netherlands. Currently I'm working as a maintenance mechanic for a cable company. I'm really into cars and anything else on 4 wheels, always have been. It's only since 2 or 3 years ago that I really started to like electric vehicles though. I think mainly because of the performance of the Tesla Roadster, never thought an electric could go so fast while not emitting anything. Little did I know back then.
The more I started researching electric cars after that, the more I started to like them. And now I'm at a point where I really don't want anything else than electric anymore. Sadly for my job I'll still have to stick to gas since it's a company car. But for driving in my free time I'm planning to get a quad bike converted to electric. And maybe in the future a car when I have some more experience.

So, moving on to the project with the quad bike I'm planning.

My skill level: Not that great, but I know the basics since I studied for car mechanic for a few years, I just ended up doing something else. As for fabrication, I don't know how to weld and stuff like that so I'll probably have to get motor mounts and battery boxes made. Or I could start learning how to weld. Fabricating small things like copper plates for battery connections shouldn't be a problem though, have the tools for that.
Range: I'd like to get a range of at least 80km (50 miles) at 80% DoD, which I think should be possible since the quad bike I'm looking for weighs only 170kg (375lbs). Not sure how aerodynamic it is, it is pretty low to the ground though. Make and model of the quad bike is a JLA Loncin Streetquad in case you want to look it up since I don't have any pictures myself yet.
Performance: The top speed has to be between 85-100kmh (53-62mph). Also want decent acceleration, compareable to the original 250cc motor. Not sure how fast that would be though since I haven't driven on one yet. Max 8-10 seconds to top speed I guess.
Budget: I want to spend around 6.000-6.500 euros ($7.800-$8.400) max for the conversion. Any more than that and I'm not really sure if it'll be worth it for a quad bike.
Parts I've already considered:
GBS 12v 100Ah pack x4 (for 48v system) + BMS and display
LMC LEM-200 127 Motor (contacted LMC, they suggested I use a LEM-200 D95B instead but I'm not sure which would be better)
Alltrax AXE4844 Controller (LMC suggested the Sigma PMT445 if I'd go with the D95B Motor)
Curtis PB-6 Throttle
DC DC Converter (not sure how much watt I would need)
Charger (not sure yet, needs to fit in the small frame where the gas tank currently is, do want to get a full charge within 6 hours or so though)
Cables/Connections/Mounts

With these parts I expect to be around my budget price, I'm just not sure if these parts will be good enough to get the performance I want, especially with a 48V system. Was looking for 72V as well but I'm not sure which batteries I could best use for that since I can't really fit 72V with prismatic lithium cells. The A123 pouch cells would have been nice but I guess it's not really possible anymore to get them from a reliable source.

Also, being in the Netherlands it's pretty hard to find good parts for the conversion since there has to be a CE mark on all of the electric components I'll be using to avoid an EMC (or EMI) test for road approval, which would cost 1.300 euros ($1.700).

That's about all I know right now, hoping to get some feedback on the parts I've chosen. Or suggestions for other parts that are better suited and not too expensive. And if it's possible to do this conversion with a 48V system or I should go higher to 72V with different batteries.

Thanks in advance!

Last edited by Firehuntah; 12-09-2012 at 04:10 PM.
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  #2  
Old 11-02-2012, 11:17 AM
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Default Re: Planning a road legal Quad bike / ATV Conversion

Been looking at some different parts for the quad conversion.

- 2nd hand Agni 95-R Motor
- Alltrax 7245 Controller
- 16x Sinopoly 100Ah for 48V system
- MiniBMS
- Elcon HF/PFC 1500 Charger

This would also be within my budget but a bit better performance I think. Just need to be sure that they all have a CE marking. I know the Alltrax controller and the Elcon charger have it but don't know for the rest. Can't really find any info on it.

I'm still not sure if I should go with the Sinopoly batteries and MiniBMS or the GBS batteries with their BMS. I think the GBS might be a bit too high to properly fit in the quad frame. The Sinopoly's are lower but wider and they're black which goes better with the colors of the quad. Performance and cycles are less than GBS though, but still enough for my chosen motor and controller I believe. Price is about the same.

Hoping to get some help, and hopefully get an answer on these two questions. Will this quad perform well at 48V with the chosen parts (85-100kmh (53-62mph) top speed and acceleration of 8-10 seconds to top speed)? And is a range of 80km (50 miles) at 80% DoD possible?
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Old 11-02-2012, 01:22 PM
Semper Vivus Semper Vivus is offline
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Default Re: Planning a road legal Quad bike / ATV Conversion

Hello,

keep in mind that a quad has a bad coefficient of drag and also a high Rolling Resistance.
With 4,8kWh and ~7kW continuous motor power, I would say, 50km and 80km/h are more realistic.
Also have a look at the gearing. I would guess you are going to build a direct drive. I think the Agni is over 3000rpm at 48V and you have to fit a sprocket in the quad for that gearing. That would become more complicated if you would switch to 72V.
Did you also thought about using Calb CA cells, i.e. 22x 60Ah for a 72V system? I'm not sure if the will fit.

Kind regards
Tom
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  #4  
Old 11-02-2012, 03:25 PM
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Default Re: Planning a road legal Quad bike / ATV Conversion

Yeah that's true but I think the coefficient of drag will already be less with the quad I'm going for than with a usual quad where you sit higher, even though most of the wind resistance probably comes from the driver. Can't do much about the Rolling Resistance though, would need one with an independant rear axle and differential. But those are all pretty expensive sadly.

As long as I can get a top speed of 80-85km/h I'll be happy, don't really need to go faster than that since I don't plan on using the quad on the highways here. Range of 50km would be a bit lower than I expected though. It's still not too bad but for cruising around in the weekends it won't really get me all that far.

I'd like to go direct drive yeah, don't know about gearing yet but I think for the Agni (which is 71 rpm / V, so at 48V 3408rpm) I'm looking at a 4:1 ratio or just a bit smaller. For 72V with the Agni I'd need a 6:1 ratio which will be hard to fit I think. If I'd go with the LMC motors though, they have lower RPM and some more torque. So I would still be able to go with a 4:1 ratio at 72V. I'm just not sure about the performance of those motors, especially the LEM-200 D95B since at LMC they suggested I use that one for the conversion.

I checked the Calb CA cells but they're quite expensive compared to the Sinopoly's or GBS'. Fitting 22 cells in the small frame won't be possible either I think, fitting 16 100Ah's will already be a challenge. 22x 60Ah will also get me an even less kWh pack and I definately don't want the range to be below 50km. Also been looking for A123 pouch cells, probably easier to make a 72V pack out of those with 80 or 100Ah. Problem is just that getting these isn't so easy anymore it seems.
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Old 11-03-2012, 11:10 AM
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Default Re: Planning a road legal Quad bike / ATV Conversion

I think one of the main advantage of a quad compared to a motorcycle is the possibility to put the motor on the rear swing arm and let all the available space of the original motor for the battery. (watch the second picture of the gallery)
http://green.autoblog.com/2009/10/10...equad-w-video/

Go with 72v for higher performance and put the maximum battery (40Ah, 60Ah or more) in the frame.
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  #6  
Old 11-03-2012, 12:00 PM
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Default Re: Planning a road legal Quad bike / ATV Conversion

Yup, the eKRAD quad is my main inspiration for doing a street quad conversion. It's too bad there's only 2 pictures and 3 video's of it, would really like to see more. Think they stopped that project though and are now focusing on cross motorcycles.

The quad I'll be using for the conversion is very similar to theirs, it's just that they have the 'race' version so the rear bridge is a bit taller and bigger frame since it comes with a 350cc motor. The one I'll be getting is the normal 250cc version. And the electric motor will indeed be mounted in the rear swing arm. With the eKRAD quad they built a whole custom rear swing arm to fit the motor but I'm not sure if I'll do that since it's a lot more expensive than just letting it drop in slightly and build mounts to keep it in place. But I don't know if that will fit well untill I actually have the quad and the electric motor here.

I'd really like to go with 72V but wouldn't I be sacrificing range for performance if I'd go 72V with 60Ah instead of 48V with 100Ah? Or will it actually be around the same since 72V will be easier on the motor? I'm not sure if I'll be able to fit 23-24 60Ah cells though since the space in the frame isn't all that big. Fitting 72v 60Ah with A123 pouch cells wouldn't be hard I think but with prismatic cells I have no idea. The Sinopoly 60Ah are pretty small though so that might be possible (Edit: I forgot these Sinopoly's are only 5C burst/impulse, which would be 300A for the 60Ah, wouldn't be enough to feed the Alltrax 7245 controller which can take 450A). The Calb CA 60Ah's however are very high (even higher than the GBS 100Ah) so that would be a problem. And the Thundersky and GBS are probably too wide. It's hard to tell though since I don't have the quad here yet, only know the dimensions.

If I were to go with 72V though, would I be able to use a LEM-200 D127 (with 3600 RPM)? Cause if I'd go with the Agni which will go up to 6000 RPM I'll have a hard time with the gearing. Would most likely need a 6:1 or even 7:1 ratio for that. With the LEM-200 D127 I'd only need around 4:1 ratio which will be easier. I'm just not sure about the performance with lower motor RPM?

Last edited by Firehuntah; 11-03-2012 at 06:04 PM.
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Old 11-04-2012, 12:20 PM
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Default Re: Planning a road legal Quad bike / ATV Conversion

Today I've been looking at the Calb cells a bit more and saw that the SE 60Ah cells have very nice dimensions. I would probably be able to fit 23 or 24 cells of those cells in the quad frame. But then I was wondering what other capacities they have for the CA series and took a look at the CA 70Ah. To my surprise they're the exact same dimensions as the SE 60Ah. Thought they would be larger since the CA 60Ah are so large (the height that is).

So that means I will probably go with the CA 70Ah cells for a 72V system, which also gives me a bit more capacity than a 48V 100Ah system. I also really like the performance of these batteries, as I've seen from Jack Rickard's video of testing them. Just need to find a supplier for them, preferably in Europe.

One question again though, should I go with 23 or 24 of these cells? With 23 I'd have 73.6V nominal, while with 24 it'd be 76.8V. I'll be using the Alltrax 7245 which can take up to 90V so for that it won't matter I guess, even when they're fully charged it'll still be below 90V. Problem is just fitting 24 of those batteries in the quad frame. With 23 cells it would already be much easier to fit. But I guess a bit less performance because of voltage sag under load even though these CA's won't sag all that much when only drawing max 450 amps (6-6.5C).

Also with a 1.5kW Charger, how long do you think it'll take to charge this rather small pack from empty to full (with 80% DoD). And would I need a 72V or 84V charger, or even 96V? I'm guessing 84V or 96V since the nominal voltage of the pack is already a bit above 72V? Haven't really done much research on chargers yet so I want to make sure I go with the right charger.
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Old 11-07-2012, 02:47 PM
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Default Re: Planning a road legal Quad bike / ATV Conversion

I've contacted CALB (Europe office in Germany) and they're saying the CA 70Ah cells are not in production yet? If this would be true and it's still going to take long for them to hit production I may have to go with the SE 70Ah's. These will probably fit as well but it would be easier with the CA's since they're smaller. It's weird that I do see the CA 70Ah's in some USA webshops and with a price listed. Does anyone know if these cells really aren't available yet?


Anyway, I've decided on the motor as well now. Part list so far:

- LMC LEM-200 D127
- Alltrax AXE 7245P (will probably also get a torque control module for this)
- 24x CALB CA 70Ah or SE 70Ah
- MiniBMS
- Elcon Charger 1.5kW
- Curtis PB-6 throttle box
- DC DC Converter (can easily get them here in the Netherlands)
- Main contactor, reverse contactor, fuses, cables/connections

Think this list is pretty much final now. Just have to wait and see if the CALB CA's are available anywhere, otherwise I'll go with the SE's.

I'm sure I'll get good performance with these parts, I'm just a bit worried about the range. I would really like to get at least 80km on a charge so I hope it'll be close to that. I've seen a conversion in Belgium with the same LMC motor and lead acid batteries (72V 68Ah) claiming to get 50km range at 45 km/h though so I'm guessing with lithium I could double that at least?
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Old 11-11-2012, 03:46 PM
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Default Re: Planning a road legal Quad bike / ATV Conversion

I've been given an offer of a Kelly KDH72801E controller (360A continuous, 800A for 1 min) for less money than the Alltrax 7245 (200A continuous, 450A for 2 mins).

What I like about the Kelly is the option for Regenerative Braking and high continuous current rating so it won't need much cooling I guess. The max amps I'll need (400A) will be just above the continuous. And it comes with torque control mode while the Alltrax 7245 doesn't.

However I've read many things about these Kelly controllers blowing up pretty fast. And the Alltrax controllers seem very reliable. For the Alltrax I could also get a torque control module from a company in Germany so that wouldn't a problem, just costs more than the Kelly.

So I'm looking for some advice, what would be the best choice?
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Old 11-12-2012, 10:52 AM
Semper Vivus Semper Vivus is offline
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Default Re: Planning a road legal Quad bike / ATV Conversion

Quote:
Originally Posted by Firehuntah View Post
I'm sure I'll get good performance with these parts, I'm just a bit worried about the range. I would really like to get at least 80km on a charge so I hope it'll be close to that. I've seen a conversion in Belgium with the same LMC motor and lead acid batteries (72V 68Ah) claiming to get 50km range at 45 km/h though so I'm guessing with lithium I could double that at least?
Hello,

because of the bad coefficient of drag the range will strongly vary with speed. I calculated with 65km/h. At 45km/h I get about 100km (instead of about 60 at 65km/h). I don't know if my assumed cd fits to a usual quad. But it is in the range of the 90km of your mentioned lead acid conversion.

Kind regards
Tom
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