MAC motor & voltage rating

[trav]

I think I'm about to pull the trigger on my first eBike kit, but I have a question. Is the voltage limited by the controller; is it limited by the motor; or is it limited by both?

I am looking at getting the "Upgrade EM3EV Vers. Mac 500/1000W Pick'n'mix Kit." Whenever a motor is selected from the list, the only options that are listed are "... loaded @ 36v..." I was hoping to run the motor at 48V, but I just want to make sure that it's possible before I buy everything, hook it all up, and find out I've melted the wires in the motor.

If it helps to answer the question, I'm looking at purchasing the following items from http://www.em3ev.com

EM3EV Pick'n'mix Kit

• 9 fet 30A controller
  255 rpm loaded @ 36V 10T motor
  26" Alex wheel (Sapim Spokes)
  Thumb throttle/ebrakes

50V 14.35 Ah Samsung Rectangular Pack

• Charger with switch for 90% charging
  Cycle Analyst 3.0

 

[DAND214]

Do it!
You'll love it.

36v is for speed spec. On 50v 10t shold be close to 28+-.

You will not have a melting problem with 50v.

I have 3 8t running between 44 to 60v, no problems. All have 26 x 2.35 tires.

Dan

 

[trav]

That is awesome to hear. Thank you for the quick response!

 

[999zip999]

I like rear drive and a torque arm.
1800Watts is ok.

 

[dogman dan]

Solid choices IMO.

The controller will have a range of voltages it operates at. 50v, 48v, etc will be fine with that controller. It's absolute maximum might be 63v, as measured at the battery at full charge.

Other controllers may be 72-90v, or some few are 36v-72v. What controls the power is a combination of that voltage, x the amps.

Your choice will have about 1500 watts of power. 50v x 30 amps = 1500 watts. At full speed, cruising, you will draw more like 1000w. A power level the mac can handle fine. The full 1500w will only happen as you leave a stop sign, or climb a very steep hill.

 

[spisska]

The full 1500w will only happen as you leave a stop sign, or climb a very steep hill.

To add to this: the kit from em3ev will include a 3-way switch on the throttle. It will come configured to work at 50%, 75%, and 100% of available draw. On the middle setting, you'll be feeding a max of around 1000W to the motor, have a top speed of around 28 mph, and be able to cruise at 20-25 mph all afternoon.

If you set it to the top setting, you're increasing torque rather than top speed. You'll get to 30mph at the top setting, but the real difference will be the power throughout the motor's operating range. You'll take off faster from the line, and you'll climb hills faster, but you'll also be using significantly more juice to do so, shortening your range.

I'm using this kit also with a 50V battery, and I find I pretty much always keep it at 75%, except for short periods where I need a little boost.

You'd do yourself a favor to order a couple extra throttles -- the ones with this kit are crappy, but they're also cheap and already have the right terminations. You're going to break your first, and probably your second, throttle much faster than you imagine. Make sure you're covered with backups until you can put in a throttle you like.

 

[trav]

It's good to know that I'm on the right track. I do have a couple steep hills around here, but they are not very long. If I choose my route carefully, I could probably navigate around both of them, and it would probably be a lot safer to do so.

Concerning the throttles, does anyone have some good recommendations for a throttle upgrade?

 

[spisska]

Concerning the throttles, does anyone have some good recommendations for a throttle upgrade?

After breaking two stock throttles, I went straight to the Magura potentiometer throttle. It's much more durable, though you will want to perform a simple mod to add variable resistors to remove dead zones at the top and bottom.

The Holy Grail is a cable-actuated pot/hall throttle that works seamlessly with ebikes and can use any ol' bog-standard motorbike throttle like changing the tablecloth. Such a thing does not exist, unfortunately.

 

[DAND214]

You said you are going, thumb throttle. Do you have twist shifters or trigger? It's hard to use a twist throttle with twist shifter, so the thumd comes in. And it's hard to use a thumb with trigger shifters.

As said above, buy a couple extras,, now when you order. Cost of them is less than the shipping later.

How agout a torque arm or two? Is the frame steel or aluminum
' Unless the drop outs are really beefy, buy them now before you wish you did.

Dan

 

[deffx]

The Holy Grail is a cable-actuated pot/hall throttle that works seamlessly with ebikes and can use any ol' bog-standard motorbike throttle like changing the tablecloth. Such a thing does not exist, unfortunately.

THis does exist, is it the holy grail? i dont know yet, maybe not seemless, no idea on the tablecloth

http://endless-sphere.com/forums/viewtopic.php?f=31&t=58801&hilit=domino

 

[vptech]

I do have a couple steep hills around here, but they are not very long. If I choose my route carefully, I could probably navigate around both of them, and it would probably be a lot safer to do so.

You should have no worries with your chosen set up as it comes with a temp sensor programed to the CA3 that will reduce power if you start to overheat.
You'll be very happy with your choices. Add in a matching Freewheel and a disc spacer if you have disk brakes as well as the torque arm!