motor and battery help please

[Denisesewa]

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Hi, I am new to this forum and hope to get some ideas on motors and batteries for my project, I am currently running a 1200 watt cheepo motor on 48 volts with an alltrax 300 amp controller ( programed for 150 amps), the batteries are 12 volt 12 AH chineese and have not lasted very long before losing performance.
I am hoping to find a 36 volt motor in the 3000 watt range at around 3600 RPM but cant find anything in the size range I need, the "Perm" 80 would work but the RPM's are too high which would require a jackshaft to gear it down. size limit is 6 inch diameter X 7" long.
The 4 batteries are fitted 3 in a box and one under the seat with the controller under the seat as well, I would like to lose one battery, keep or improve present performance and hopefully increase capacity ( perhaps 18 AH SLA or AGM 's ).
I simply cant afford Li-po's , This project has been very satisfying and I am happy with the results but its time to upgrade.
Any Ideas on motor or battery type and brand would be appreciated. follow the link below to take a look at my bike at an earlier stage ( pre alltrax and 48 volts).
Denise
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http://www.austinev.org/evalbum/1363

 

[vanilla ice]

150 is too many amps for those bats. Even 18ah ones. If you can fit three 26ah batteries maybe... its still pushing it though. I think standard practice is to base the max controller amperage on the battery's 1hr rate at 5c.

Or you could try a hybrid parallel pack if you can't afford an all lipo pack. Where the lead is the main energy storage and you have a small hi-C pack to buffer them from the current draw. I've been thinking about trying this.

Which forks are you running? I have the same frame.

 

[TylerDurden]

Nice ride.

You'll probably get more satisfaction from upgrading to lithium (not Lipo: = LiCo), than by doing a motor upgrade.

You could go to 60V or 70V in LiFe or LiMn and force-air cool your motor.

That would give you more than 3KW at the back wheel if you only draw 50-60 amps.

Lithium: Faster charging, longer life, little sag, BIG power. (Lead sux.)

 

[Ted_Z]

Capacity alone might not be the issue with your batteries. Cheap SLA's simply cannot supply the high current demands of high power motors. For batteries I'd go with a Hawker/Energys Genesis type AMG battery. These can source something like 400A. The 13Ah or 16Ah would suit your needs.

As for the motor, Maybe this scott motor would work http://www.cloudelectric.com/inc/sdetail/602 It's slightly larger than what you wanted (~6"x10"). I used a simlar Scott motor on an electric gokart with much success.

 

[vanilla ice]

I agree that you should be looking at different batteries before changing out the motor. Air cooling could get you to ~2500W. But with your goals I don't think lead is going to work out.

You're in for $1200 so far. I guess the question is how much more money are you willing to spend on this thing? Adjust the budget or adjust the expectations.

 

[Denisesewa]

I think maybe the hawkers will help, I am really not disatisfied with the performance at 48 volts, the Altrax is rated at 48v so upping the voltage would require a new controller(not sure if I can push the alltrax to 60v), funny thing about the controller is when I set it at 60 amps the performance was way down even though the 40 amp slo-blo never popped and the controller history never reached above 60 amps even at stall, I know it doesnt make sense but upping the current of the controller to 150 helped a bunch and the motor doesnt get more than warm to the touch, batteries and wiring dont get hot either.
Any recommendations for a supplier of Hawkers??
BTW, the forks and rear shock are Stratos Helix, I revalved the forks and changed the spring rate so they now feel very much like a trials bike, very plush and responsive, the rear shock mount location was changed to allow 8 inches travel.
Denise

http://hometown.aol.com/denisesewa/index.html

 

[RevDon]

Hi Denise!

Try these guys: http://www.dcbattery.com/index.html They're located in Florida, and have a good rep with EVers and solar power folk.

Don

 

[TylerDurden]

the Altrax is rated at 48v so upping the voltage would require a new controller(not sure if I can push the alltrax to 60v)

If you installed the Alltrax AXE, you should be good up to 72v.

 

[Boondawg]

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Hi, I am new to this forum and hope to get some ideas on motors and batteries for my project, I am currently running a 1200 watt cheepo motor on 48 volts with an alltrax 300 amp controller ( programed for 150 amps), the batteries are 12 volt 12 AH chineese and have not lasted very long before losing performance.
I am hoping to find a 36 volt motor in the 3000 watt range at around 3600 RPM but cant find anything in the size range I need, the "Perm" 80 would work but the RPM's are too high which would require a jackshaft to gear it down. size limit is 6 inch diameter X 7" long.
The 4 batteries are fitted 3 in a box and one under the seat with the controller under the seat as well, I would like to lose one battery, keep or improve present performance and hopefully increase capacity ( perhaps 18 AH SLA or AGM 's ).
I simply cant afford Li-po's , This project has been very satisfying and I am happy with the results but its time to upgrade.
Any Ideas on motor or battery type and brand would be appreciated. follow the link below to take a look at my bike at an earlier stage ( pre alltrax and 48 volts).
Denise
_________________
http://www.austinev.org/evalbum/1363

Hey Denise,
I too am new and was very interested in your bike.
I am in the process of building something simular, but a touch more insane............ :lol:
Something like this:
http://www.thunderstruck-ev.com/jackal_performance.htm

Top Speed - 45 mph
Range - 15-25 mi
Charge Recovery Time - 5 miles per hour (20 mph upgrade avail)
Motor - B&S Etek - 48V, 15 pk hp, permanent magnet, brush DC motor
Batteries - (4) 12V 20 Ahr B&B AGM SLA
Controller - 300 Amp Alltrax programmable
Weight - 130 lbs
Price - $3700

I want to go with the PMG-132 Perm DC Motor manufactured by Perm Motor in Germany, though, as I understand it is similar in size and weight to Briggs & Stratton Etek but, at the same voltage it has 50% higher peak power output, a 40% higher torque constant and 120% more stall torque. I also want to go with Li-po's for power, if I can swing the cost............

Doing all the fabrication myself, I am hoping to keep the project under $3,000. Is that realistic?

Any thoughts on the above project would bring much thanks, as I am new to the whole concept, being a Mechanic with welding & fabracation skills, with the only electrical & battery knowlage coming from 20 years of design, building, and flying electric radio-control aircraft! I got into electric powered flight at almost it's inseption, when batteries & motors weighed a TON! :wink:

 

[Link]

Maybe. I'd check out the Etek-R, if I were you. We nead more ginea pigs 8)...

Figure you'll pay $500 (for an Etek-RT), mebbe another $400 for the controller. Another $250 for random stuff (wiring, relays, throttle, etc.). Depending on how much you pay for the materials, you might have about $1500 for batts left. For premium batts, this might get you around 1kWh. No idea on the runtime, though. Cheap (like PingPing on eBay) batts might get you a little over 1.8kWh of batts.

This is all WAG-ing, BTW.

 

[JRP3]

the Altrax is rated at 48v so upping the voltage would require a new controller(not sure if I can push the alltrax to 60v)

If you installed the Alltrax AXE, you should be good up to 72v.

I think it depends on which AXE she has. The AXE 7234 and 7245 are rated to 72 volts, the 4843 she is listing on her evalbum page is rated for 48 volts.
http://www.alltraxinc.com/Products_AXE.html