72v Controllers

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hguido1
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72v Controllers

I modded my stock controller on the xb-600 with the shunt mod. Works great. Thanks to all the help on this forum. I am doing 30 mph now with the additional battery under the seat. It is a 12v 12ah battery. I was thinking of replacing it with an 18ah since they have them here locally. Would I see a benefit in distance or speed by doing that?

Also,

My main question is Has anyone tried the 72volt controller that you can purchase on ebay? 1500w 72v for like $75.00 I like this option since I don't really want to put all new mosfets and caps in the stock controller. I thought I read that one of the members here tried it and it didn't work real well with the motor. I wonder why? If anyone has tried this please give me your thought.

mf70
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Re: 72v Controllers

It is a 12v 12ah battery. I was thinking of replacing it with an 18ah since they have them here locally. Would I see a benefit in distance or speed by doing that?

You would see a benefit in distance and battery life. In a series pack, ALL batteries discharge at the same rate. A battery with a smaller capacity will, however, exhaust its capacity before the other four batteries, and then the trouble starts. It is very easy at that point to ruin the discharged battery before you even notice a problem.

If you NEVER go near even a 50% discharge OF THE SMALLEST BATTERY, and if you charge the smaller battery separately, the lashup should last fairly well.

Mark

captainslug
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Re: 72v Controllers

My main question is Has anyone tried the 72volt controller that you can purchase on ebay? 1500w 72v for like $75.00 I like this option since I don't really want to put all new mosfets and caps in the stock controller. I thought I read that one of the members here tried it and it didn't work real well with the motor. I wonder why? If anyone has tried this please give me your thought.

The stock motor wiring cannot handle a higher wattage rated controller. I've tried and e-crazyman controller from eBay and just testing it for 15 seconds the wiring got very warm to the touch.

You have to keep in mind that the motor is only rated for handling a constant 600watts. If you double or triple that for very long it will fry out. If you replace the controller, you should replace the motor as well.

Modifying the stock controller will work more predictably since it will still limit the output to a level that's relatively safe for the motor.

hguido1
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Re: 72v Controllers

I see a few people have modified there controller and it seems to work at 72 volts. No one has said they fried the motor or the wiring to the motor yet. I hooked up a bike computer and a gps program from my iphone today. The shunt mod and 60v only get a speed of 24.5 to 26 mph even though the bike speedo say 30 mph. I would like to go 30 mph so I guess I need more voltage. My question is still has anyone used the aftermarket 72v controller off ebay to do their 72 volt mod?

sixpax2k9
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Re: 72v Controllers

Some have tried it with varying results, most not that great. My advice would still be to buy some new mosfets and capacitors to replace in the stock controller. Others have tried a new controller, to get stuff like regen braking etc. but most have had problems and you would probably need to know more about the electrics of the bike to use a new controller than you would to modify the stock one. 25mph actual speed is actually pretty good for the 60V with shunt mod. Perhaps I could use a shorter shunt, but I normally get about 23mph on level ground at 60V. Dont forget though... the faster you go the shorter distance you will get.

Dave ; Tennessee
XB-600.

hguido1
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Re: 72v Controllers

Sixpax didn't you say a while back that with the shunt mod that the stock controller was drawing close to 40 peak amps. If that is the case the 72v ecrazyman controller isn't much different. It has a max 45 amp draw. That can't be to much harder on the motor could it? I believe that if I have too, I will also replace the tiny wiring going back to the motor. That shouldn't be to hard to replace with a thicker gauge.

I wonder has anyone tried to install an xm-2000 hub motor on the xb 600? Would it fit I wonder?

I am just going to order the 72v controller and see how it goes I guess.

hguido1
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Re: 72v Controllers

I received an email today from ecrazyman about the 72v controller I have on order. He was very nice he responded quickly to my questions. He stated in his email that the tiny wires to the hub motor are "resistance temp wires" and I shouldn't worry about them. He also stated the "max" current was 45 amps. How does this controller generate that much current and be limited to 1500w when the voltage is 72v?

Does anyone know the term "resistance temp wires" if so, can someone explain this please?

hguido1
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Re: 72v Controllers

Please refer to the help with wiring a 72v controller thread for full update.

zerogas
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Re: 72v Controllers

I tried an ecrazyman 72v controller. If I remember correctly, it took me most of the day to figure out which wire went where. Also there are 2 tiny black wires that change the controller from 60 degrees to 120 degrees. Trial and error will show you if you need them connected or not. Also, there is a thread on the Endless-Sphere forums(can't remember the address) you will need to look at. You will need to solder in a resistor to eliminate the "shuddering". Don't know why it does this, but it does. I think these controllers are actually meant to be used on bikes, not scooters. I ended up changing the mosfets and caps in my stock controller to run it at 72v which worked like a charm until I applied 84v to it. It would have been nice to use the ecrazyman controller though, it was a well made unit. The ecrazyman controllers have some BEEFY powertraces. You won't blow one up!
-zerogas

Keep the rubber side down and the shiny side up.

hguido1
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Re: 72v Controllers

Zerogas, I think you must have had an old ecrazyman controller. There is no phase wires and there is no need to put a resistor for shuddering in the current controller. It does take some time to figure out the phase wires and hall sensor wires. The colors are the same but they dont hook up to the same colored wires on the bike. I have been running mine for several months now and it works great. I have a top speed of 30 mph on a gps speedometer and on a bike speedometer I added. The new controller won't even work with the stock xb-600 speedometer so you have to add one. It is a easy upgrade to the xb-600. I run mine at 72v but the new controller is good up to 84v so I have room to add a battery for some more top speed. Nice to hear from you. How's your scooter running?

zerogas
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Re: 72v Controllers

Is Ecrazyman still selling these? I haven't seen any on Ebay in a while.

Keep the rubber side down and the shiny side up.

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