Search found 383 matches

by TMaster
Jan 29 2013 7:13pm
Forum: Battery Technology
Topic: Why won't tesla show it's battery pack?
Replies: 19
Views: 2666

Re: Why won't tesla show it's battery pack?

IF Tesla can build a midsized sedan for $25k to $35k it will be all over for Gasoline. We'll have too see what the version 3 car will be! :mrgreen:
by TMaster
Jan 29 2013 7:05pm
Forum: EBike Technical
Topic: 18FET 84-132V Infineon controller from Lyen - poor quality
Replies: 24
Views: 4342

Re: 18FET 84-132V Infineon controller from Lyen - poor quali

He always shipped mine in boxes. If I absolutely HAD to ship in one of those flat rate envelopes I would probably use 3 layers of foam all around and tape the outside with extra. IF it was a yescom controller with all the silcone coating inside, then no the blob wouldnt affect it, but lyen's don't h...
by TMaster
Jan 29 2013 4:07am
Forum: Battery Technology
Topic: copper vs aluminum buss
Replies: 17
Views: 1414

Re: copper vs aluminum buss

You may need some tap magic cutting fluid for putting on the tap when you tap the holes. I have never tapped copper, but I have tapped steel and aluminum and both needed it. Theres a few versions, for aluminum and for all metals. Both would work. I have machined copper, and it didn't seem as hard to...
by TMaster
Jan 28 2013 2:18am
Forum: Battery Technology
Topic: Why won't tesla show it's battery pack?
Replies: 19
Views: 2666

Re: Why won't tesla show it's battery pack?

Looks like most bad impacts to the lower area of the car will result in battery damage. But it leaves a lot of room for cargo and passengers.
http://gtcarlot.com/news_pictures/photo ... 722&w=1024
http://reviews.cnet.com/8301-13746_7-20018836-48.html
by TMaster
Jan 28 2013 1:47am
Forum: Battery Technology
Topic: Why won't tesla show it's battery pack?
Replies: 19
Views: 2666

Re: Why won't tesla show it's battery pack?

Awesome Video, thanks for posting!!! Looks like they may be using the small cylindrical cells again? What if one goes bad :? I was checking out google maps, and if you zoom in all the way on Tesla's factory in Fremont; they must be renting out there parking lot on the north side to some car manufact...
by TMaster
Jan 28 2013 12:47am
Forum: Battery Technology
Topic: Battery range in different configurations?
Replies: 11
Views: 1278

Re: Battery range in different configurations?

The lower the speed, the less wind resistance. The controller and motor won't burn off as much energy as going faster. The higher the voltage, the less amps that are needed to sustain the same wattage as a lower voltage pack. If we were in outter space with no wind restance, then yes all the packs c...
by TMaster
Jan 24 2013 5:09pm
Forum: EBike Technical
Topic: Crystalyte HS / HT maximum nut specify torque ?
Replies: 8
Views: 1187

Re: Crystalyte HS / HT maximum nut specify torque ?

I use 35 ft-lbs (48 Nm) on my 14mm axle nuts with a Nylon insert locknut. Haven't moved since I put them on. I have a Red permanent marker mark accross the Nut, washer and torque arm to make sure it hasn't moved. I use a real torque wrench so theres no guessing or fiddling with it. Like the others s...
by TMaster
Jan 24 2013 2:03am
Forum: Battery Technology
Topic: Acronyms
Replies: 28
Views: 2500

Re: Acronyms

Nice list! I learned some things, and the list needs some more things. :D
by TMaster
Jan 24 2013 12:24am
Forum: Battery Technology
Topic: Acronyms
Replies: 28
Views: 2500

Re: Acronyms

Thanks, I'm not a EE, but I tinker :D
by TMaster
Jan 23 2013 9:29pm
Forum: Battery Technology
Topic: Acronyms
Replies: 28
Views: 2500

Re: Acronyms

6S = 6 individual cells in a series formation. (Example: 3.3V per cell X 6 with 3Ah capacity) = 19.8V & 3AH 6P = 6 individual cells in a parallel formation. (Example: 3.3V per cell with 3Ah capacity X 6) = 3.3V & 18AH 6S6P = 36 cells total, 6 parallel formations of 6 cells wired series. (Exa...
by TMaster
Jan 23 2013 8:24pm
Forum: Battery Technology
Topic: Is this easy or hard?
Replies: 17
Views: 960

Re: Is this easy or hard?

A few years ago I took apart a 6S lipo, and the cells had glue between eachother. I didn't break the cell pouchs, but they pulled up like a tent and made creases. I decided to put it aside, and it has been sitting in store mode since. I will prolly slow discharge them down to 0 one of the days and t...
by TMaster
Jan 22 2013 8:11pm
Forum: Battery Technology
Topic: Open-source alternative to DeWalt DC9360 since Stanley shaft
Replies: 12
Views: 2177

Re: Open-source alternative to DeWalt DC9360 since Stanley s

Meanwhile, A123 develops 7Ahr 32157 cells more appropriate for e-bike use. http://www.a123rc.com/goods-474-LiFePO4+Battery+%28A123+32157%29.html Those are the cells I want to use on my next build. It will cut down on all the soldering and less work if I cell fails, than using 3X or 4X the M1 2.3AH ...
by TMaster
Jan 20 2013 1:59pm
Forum: Battery Technology
Topic: Lipo fire- no one hurt- my fault
Replies: 95
Views: 9406

Re: Lipo fire- no one hurt- my fault

Kinni420 wrote:went on its own last night.
Wow. That is scary. Puffing, then a week later with it just stting it ignites! Someones ebike could be sitting there for days and just cautch on fire without them even knowing. :shock:
by TMaster
Jan 20 2013 3:36am
Forum: EBike Technical
Topic: Best way to true a motor shaft?
Replies: 24
Views: 2166

Re: Best way to true a motor shaft?

If you can get a video of it spinning to show how bad it is that would be good. The dial indicator would be a plus. Then I could see if it's ok to run, or needs replacement. If the shaft is hardened you will have real trouble trying to lathe it down. It would have to be taken out of the motor and go...
by TMaster
Jan 20 2013 1:40am
Forum: EBike Technical
Topic: Best way to true a motor shaft?
Replies: 24
Views: 2166

Re: Best way to true a motor shaft?

Have you checked the bearings?
by TMaster
Jan 18 2013 7:57pm
Forum: Battery Technology
Topic: Lipo fire- no one hurt- my fault
Replies: 95
Views: 9406

Re: Lipo fire- no one hurt- my fault

You must first discharge the pack completely by putting a low load (never a dead short) across the pack such as a motor, light bulb, or resistor, or (discharge with a charger on a low amperage _ TMaster). and let it sit until the pack reads zero volts. Then use a new # 11 blade to slice a very smal...
by TMaster
Jan 18 2013 3:43pm
Forum: EBike Technical
Topic: GEAR MATERIAL
Replies: 18
Views: 2436

Re: GEAR MATERIAL

I have machined Delrin and 6/6 nylon, the delrin is more silppery because of the teflon content, The 6/6 nylon is more gummy. Take a look at Mcmastercarr, some good information on some composite nylons and delrin. Both used for gears. Very-Wear-Resistant Kevlar-Filled Nylon Self-Lubricating MDS-Fill...
by TMaster
Jan 14 2013 3:11pm
Forum: Battery Technology
Topic: how long does a a123 20ah hold 3.65v?
Replies: 24
Views: 2034

Re: how long does a a123 20ah hold 3.65v?

When i was doing RC, the lipo's I charged would drop to 4.15V - 4.17V within minutes.
by TMaster
Jan 14 2013 2:57pm
Forum: Battery Technology
Topic: Lipo fire- no one hurt- my fault
Replies: 95
Views: 9406

Re: Lipo fire- no one hurt- my fault

As we have said before this incident was not caused by the use of RC Lipo! Proper pack design is a must no matter what cells you use be it lead, nicad, nimh, lipo, LiFeP04 or what ever. I agree. This was caused by human error; and the error had nothing to do with Lipo's. But the effect is what is i...
by TMaster
Jan 13 2013 7:31pm
Forum: Battery Technology
Topic: how long does a a123 20ah hold 3.65v?
Replies: 24
Views: 2034

Re: how long does a a123 20ah hold 3.65v?

After charging to 3.6V per cell, my A123 3P packs are around 3.5V - 3.55V in a week if not used. I have a main key switch so there is no current draw sitting. The cells get a tad warm when charging, so when they cool off, Im sure thats when the voltage comes down a tad.
by TMaster
Jan 13 2013 2:19pm
Forum: EBike Technical
Topic: Budget Wattmeter Installed!
Replies: 44
Views: 3427

Re: Budget Wattmeter Installed!

i just wanna buy the little 3V 8pin regulator to fix the turnigy wattmeter i blew up at 80V. Just power resist it. I'm using a 2K 2W resistor, good up to 86v http://endless-sphere.com/forums/viewtopic.php?f=3&t=13607&start=255#p349782 http://endless-sphere.com/forums/viewtopic.php?f=3&t...
by TMaster
Jan 13 2013 2:33am
Forum: Battery Technology
Topic: Lipo fire- no one hurt- my fault
Replies: 95
Views: 9406

Re: Lipo fire- no one hurt- my fault

Sorry guys I was under the asumption that the 3S and 4S packs were hooked in series to make a higher voltage to run the bike. He didnt explain his total battery setup. I don't know anyone that runs such a low voltage lol. The bike is run on 14.8V total??? Of course the voltages would act like that i...
by TMaster
Jan 12 2013 11:08pm
Forum: Battery Technology
Topic: Lipo fire- no one hurt- my fault
Replies: 95
Views: 9406

Re: Lipo fire- no one hurt- my fault

Bigmoose, Here is a link to a collected over 200 seperate lipo related failures/fires. The RC world has been using lipo's for 8 years or so. Not sure if you want to use this information or not.

http://www.rcgroups.com/forums/showpost ... ostcount=4
by TMaster
Jan 12 2013 10:51pm
Forum: Battery Technology
Topic: Lipo fire- no one hurt- my fault
Replies: 95
Views: 9406

Re: Lipo fire- no one hurt- my fault

Thank you for your well wishes. For now I am assuming the 4 series overcharged the 3 series, so the 3 series cells would be about 4.90 volts each or more, is that the point where they outgas? the 4 series I hooked it to was fully charged as well, then when I examined the 4s later all the cells were...
by TMaster
Jan 12 2013 10:47pm
Forum: Battery Technology
Topic: Lipo fire- no one hurt- my fault
Replies: 95
Views: 9406

Re: Lipo fire- no one hurt- my fault

This is another story to add to the list why I would never run lithium polymer batteries on a ebike. Why pollute a thread looking into a failure with personal RANTS about battery types?. It was a little ranting on the lipo's in comparison, but if someone see's that and it saves failure in the futur...