Jeremiah, what is your gearing on the bike.. that will play a big role in you amp draw at stall and through out your ride.. underload if your gearing is too low you wires and batteries are going to heat up real quick and that may have played a big part of why your BMS wires went pop.... if you get a chance tow your bike over to my house and let's see what we can do.. it will give you a chance to try out my electric tractor and electric dirtbike.... BTW hi shawn this is armando (hope you remember me) on the east coast, could you start a new post on what to expect for BBB cause this year i will be over there... with or with a bike but i have made plans to be there......
--- On Tue, 9/16/08, Jeremiah Johnson <[EMAIL PROTECTED]> wrote: From: Jeremiah Johnson <[EMAIL PROTECTED]> Subject: Re: [FLEAA] Need help with a BMS To: "FLEAA Mailing List" <[email protected]> Date: Tuesday, September 16, 2008, 12:09 PM I am using a kelly 72v 400a controller, with a Mars Brushed motor. I believe the number is ME0709, it is commonly called the Etek RT motor. I'm not sure what my peak A draw is yet. My laptop got stolen this week, so I can't connect to my controller yet to see what the settings are. I just finished the bike yesterday, so I took it out for an easy test. I made sure to take it easy on the throttle to get it going. I also have a cycle analyst, but it is a low power unit for my Ebike, I have to get a higher powered shunt to modify it for the motorcycle so that I can get accurate data on the power usage. On 9/16/08, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > > Matt is correct, we have used much heavier cable on some of the bikes we > built. My current motorcycle that uses a DC motor and an Alltrax 72V 450A > controller is using 1/0 cable for the battery, motor and controller > connections. The Charger wires are 10ga. The bike draws a constant 100A at > 40-45MPH and the 1/0 handles that fine. I think you find 6ga a little on > the small side for a constant 100A. > > What controller are you using? What is the peak A draw? What motor are you > using? > > Shawn > > > Yeah, I have a bunch of 6ga welding wire that I also used on the project. > > I > > was kind of stuck with what came out of the battery pack, so I had it > > switch > > to 6ga after it came out, going to the motor and the controller. I'm not > > sure if I am using the right terminology, I am teaching myself how to do > > this stuff as I go. But the power wires coming out of the pack (which I > > was > > refering to as Lead wires) from which I draw power to go to the motor and > > controller, is 10ga. The charging wires, which I plug the charger into, > > are > > even a smaller ga, it's kind of hard to read it, but I'm guessing it is > at > > least 12ga. I didn't have the charging wires plugged in to anything > while > > I > > was riding the bike, but it appears that those are the ones that got the > > most damage as far as melting inssulation. It was probably just that > they > > got heated up by the power wires that they were next to. All 4 wires are > > coming out of the same hole in the pack. > > > > I purchased the pack from someone online from a forum. I know, buyer > > beware, but he said that he didn't use the pack, he was just going with a > > different battery setup. Someone name Gary (I think his last name is > > Goodrum) from OC Cali built the pack. I had his info on my laptop, but I > > just had my house broken into and they stole my computers and stuff. > > > > > > On 9/16/08, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > >> > >> Hi Jeremiah, > >> > >> First, congratulations on getting the bike together! Sounds like it'll > >> be fun when you get it back in better shape. > >> > >> Along those lines, I would say that you certainly were not being > >> paranoid about using 10GA wire. Seriously, 10GA for 100A continuous?? I > >> would have used a minimum of 4GA, and if I'm not mistaken, Shawn and I > >> used 2GA on our 48V and 24V bikes. Granted, those hit upper limits of > >> 850 amps or so, but would cruise near the 100A range. > >> > >> Re-reading your post, though, it looks like you're talking about the > >> charging cables for the pack, not the traction cables. Is that correct? > >> You mention "lead wires" later on, so I guess you really are talking > >> about the high current conductors that run back to the controller. > >> > >> May I ask who built the pack and from where you purchased it? > >> > >> Matt Graham > >> Treasurer, Florida EAA > >> http://www.jouleinjected.com > >> > >> > >> -------- Original Message -------- > >> Subject: [FLEAA] Need help with a BMS > >> From: "Jeremiah Johnson" <[EMAIL PROTECTED]> > >> Date: Tue, September 16, 2008 6:24 am > >> To: "FLEAA Mailing List" <[email protected]> > >> > >> Hi everyone. I finally got my first EV motorcycle running and took it > >> for a > >> small test ride down the block. I went about half a block to the stop > >> sign, > >> turned around and started back to my house. I was at about 1/2 throttle, > >> just looking down at everything mechanically moving to make sure > >> everything > >> was good. Then i hear a slight pop, loose power, and some white smoke > >> comes > >> out of my Lifebatt battery pack. I pushed the bike back to the house and > >> pulled out the battery pack. I measured the voltage and still had 52.4 v > >> (had 52.5v when I started). I opened up my pack and saw that the two > >> charging wires going into the pack had some melting of the insulation > >> and > >> there were a couple of components on the circuit board that looked > >> burnt. I > >> think the components MIGHT be able to just be replaced, but I don't > >> trust my > >> soldering skills to do that. Anyone got skills in this area, or know > >> where > >> I can get another BMS from? > >> > >> I think the root of the problem was that the lead wires coming out of > >> the > >> pack were too small of a ga. I had a whole thread on that on another > >> forum > >> and I was bassically told that I was being paranoid and that the 10ga > >> wire > >> would work for my application and to go ahead and run it. The person who > >> built the pack and put 10 ga wires coming out of it, said it was good > >> for > >> 100a continuously. > >> _______________________________________________ > >> Florida EAA mailing list > >> [email protected] > >> http://www.floridaeaa.org > >> > >> > >> > >> _______________________________________________ > >> Florida EAA mailing list > >> [email protected] > >> http://www.floridaeaa.org > >> > > _______________________________________________ > > Florida EAA mailing list > > [email protected] > > http://www.floridaeaa.org > > > > > > _______________________________________________ > Florida EAA mailing list > [email protected] > http://www.floridaeaa.org > _______________________________________________ Florida EAA mailing list [email protected] http://www.floridaeaa.org _______________________________________________ Florida EAA mailing list [email protected] http://www.floridaeaa.org
