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  #1  
Old 11-03-2009, 07:55 PM
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Location: TX
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Default Can you test an ebike with bad batteries?

I am moving to a state where gas assisted bikes are illegal, so I'm trading my beloved china girl (2 stroke) for an ebike.
A fellow is interested in trading his 36v EV Global to me but the batteries are shot. Is there a way for me to verify that the controller and hub motor are sound?
One guy suggested seeing if it would work (with the back wheel raised) while the battery charger is plugged in.
Another guy told me to disconnect the motor from the controller and apply power from a 6 volt battery to see if the motor is working.
I don't know if that heinzmann hub motor is brushless or not.

I'd appreciate any other ideas for determining if the controller and motor are functional.
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  #2  
Old 11-04-2009, 01:48 PM
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Default Re: Can you test an ebike with bad batteries?

The only sure way is to use 36V worth of batteries. The battery charger trick most likely won't work, although anything is possible. Won't you be planning on selling your bike and buying a used electric, even if his bike doesn't work? If so, you'll be needing the new batteries either way, I can assure you. Nobody ever sells electric bikes that have good batteries. BTW, to which state are you moving?
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Last edited by myocardia; 11-04-2009 at 11:54 PM.
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Old 11-05-2009, 04:40 PM
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Default Re: Can you test an ebike with bad batteries?

We are moving to Houston and I'll be working downtown. I have heard that the streets downtown are dangerous for cycling.
I figure that a good new electric kit (batteries, controller, rear hub motor) for a normal bicycle with a 15 mile range will cost close to a grand anyway.
If that is true, it seems to be well worth trading my china girl for the EV Global.
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Old 11-05-2009, 07:42 PM
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Default Re: Can you test an ebike with bad batteries?

Well, I can assure you that motorized bicycles aren't against the law here in Texas. We do however have a lower legal engine size than the other states. Of course, your 66cc engine isn't legal in the the state you live in now. Here's the actual law. As you can see, we have a maximum engine size of 38cc, instead of the 49cc that all other states seem to have.

Anyway, if you're going to have a 7.5 mile commute, that can be done on most electric bikes, as long as you don't have an aversion to pedaling. If you're going to have a 30 mile roundtrip, though, you can forget about electric. No matter how much money you have to spend, a 30 mile commute at top speed is not going to be happening, unless you have an inordinate amount of lithium batteries. The expensive ones that can do 30-40 miles can do 30-40 miles @ 10-12 MPH, not at 30 MPH. BTW, haven't you noticed how many people on motorbicycling.com are from Texas? They all ride 66cc bikes.

Talk to GeorgeNTexas, longhorn6, and the guy from Granbury who goes by something like "fall_down_stand_up". Those three all ride 66cc two-smokes, and besides the fact that they break down every few miles , they don't have any complaints. The cops in Texas don't have anything against any type of bicycle that I have ever seen or heard about, as long as the rider is riding responsibly. Most of them actually think the ones with dinosaur burning engines are cool (this is the oil state, after all).

As far as the streets of downtown Houston being dangerous for cyclists, I'm sure you're right. They're quite dangerous when you're driving a 5 ton SUV. I know for sure that at least 90% of the licensed drivers in Texas should be walking anywhere they go, instead of driving vehicles that outweigh M1A1 tanks. I still think you're just worrying about something that you shouldn't be. If you have any problems, just do what I do: shoot first, ask questions later. The cops won't bother you about that either, since it's what they do themselves!

edit: BTW, everything you've heard about Houston traffic is true. The first time I drove to Houston, I got into a stop and go traffic jam-- at 10:30 PM on a Sunday night. The last time I was there, it took me 3½ hours to drive from one side of town to the other. That was during the middle of rush hour, though.
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On this site, 99.999% of all underlined words are links.

A watt saved is better than a watt generated, since it always costs less than 10% as much, and can cost as little as 1%.

V=volt, A=ampere, Ah=ampere hour, Wh= watt hour, VOC=open circuit voltage, ISC=short circuit current, VMPP=voltage @ max power, IMPP=current @ max power, BTW=by the way, your=belongs to you, you're=you are, too=in addition to, two=1+1, to=towards

Last edited by myocardia; 11-05-2009 at 08:28 PM.
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  #5  
Old 11-06-2009, 09:08 PM
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Default Re: Can you test an ebike with bad batteries?

Sounds like I may be better off sticking with my china girl. I can easily take a 50 mile ride and have plenty of fuel remaining in my 3/4 gal tank.
I had made a lot of plans for my 2 stroke before getting the news that I was moving. I have already bought materials to make a reed valve intake. The motor kit was also going to be transplanted onto a 1976 Western Flyer that I recently resto-modded.
I'll just have to keep my socks on so I won't get in trouble like GeorgeNTexas!
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