Search found 383 matches

by TMaster
Jan 12 2013 9:36pm
Forum: Battery Technology
Topic: Lipo fire- no one hurt- my fault
Replies: 95
Views: 9405

Re: Lipo fire- no one hurt- my fault

Was that whole bag soaked with rain water?
by TMaster
Jan 12 2013 9:35pm
Forum: Battery Technology
Topic: Lipo fire- no one hurt- my fault
Replies: 95
Views: 9405

Re: Lipo fire- no one hurt- my fault

Sorry for the loss. Good thing you are ok, and hopefully it wont be too costly for the repairs. How Could the 3S pack have been over charged? Wouldn't it baloon and ignite durring the over charging process? Maybe it was puffed already from overuse, or over charging and you didnt see it before you st...
by TMaster
Jan 08 2013 5:16pm
Forum: EBike Technical
Topic: determine the correct spoke tension
Replies: 63
Views: 7288

Re: determine the correct spoke tension

Not sure, but this doesn't seem to be at any more angle then normal. You would need longer spokes.
ImageUploadedByTapatalk%20HD1356797662_5188221.jpg
ImageUploadedByTapatalk%20HD1356797662_5188221.jpg (121.99 KiB) Viewed 1898 times
5303-wheel.jpg
5303-wheel.jpg (100.31 KiB) Viewed 1898 times
by TMaster
Jan 08 2013 1:59am
Forum: EBike Technical
Topic: determine the correct spoke tension
Replies: 63
Views: 7288

Re: determine the correct spoke tension

I would get longer spokes and cross pattern them if all possible.
by TMaster
Jan 08 2013 1:27am
Forum: Battery Technology
Topic: out of ballance
Replies: 13
Views: 646

Re: out of ballance

What you really need to do is check the cells when they are drained. Run them down to 50% and check, Run them down to 25% then check. Down to 10%, be very carefull with taking them down; if you have some weak cells that have lost capacity the voltage of those cells will go lower then the others in t...
by TMaster
Dec 30 2012 1:26pm
Forum: EBike Technical
Topic: Controller fix/modification
Replies: 6
Views: 738

Re: Controller fix/modification

Since you connected so much more voltage to the controller, I would check the output of those three step down regulators sitting next to the resistors there. Those may have blown also. You'll need to replace the cap, power up the controller and probe the output leg and ground. That controller has a ...
by TMaster
Dec 25 2012 2:13am
Forum: Battery Technology
Topic: Lipo configuration is this adequate
Replies: 14
Views: 1145

Re: Lipo configuration is this adequate

I would upgrade the capacitors inside the controller to 120-200V capable, since you are going to have 100V hot off the charger. The caps will last longer. Lyen should be able to do it for you before he sends it out. With the charging setup you have pictured, you could charge all the batteries at onc...
by TMaster
Dec 23 2012 11:18pm
Forum: EBike Technical
Topic: Turnigy Wattmeter clock does not work with less than 1 amp
Replies: 8
Views: 1010

Re: Turnigy Wattmeter clock does not work with less than 1 a

Here's mine, Running less then 1 Ah; and is shows it and calculates it. My meter is over a few years old though. I also reprogramed a lot of it and modded so it can handle 100V. But i didnt mess with the low and top end of the current calculating. The internal clock as you call it is not very quick ...
by TMaster
Dec 23 2012 12:31pm
Forum: Battery Technology
Topic: Some sort of short on balance leads. What happened?
Replies: 10
Views: 1366

Re: Some sort of short on balance leads. What happened?

You have it figured out right. Thats a series junction board. You can get on digikey and order a male header for like a buck and replace the one that you smelted. There are all kinds of different brands of parallel boards out there if you need to charge that way. I can't wait for the day when someon...
by TMaster
Dec 22 2012 3:09pm
Forum: EBike Technical
Topic: Glass puncture through the tire
Replies: 16
Views: 2138

Re: Glass puncture through the tire

Thanks for everyones 2 cents :) I actually deflated the tube and poked in the crack and it wasn't cut through all the way to the tube. But It is close; I'm guessing its cut all the way to the beads. I'm going to ride it here soon and see how it goes. I will be very carefull. If it starts to grow I w...
by TMaster
Dec 22 2012 1:43pm
Forum: Battery Technology
Topic: A123 Systems 20Ah prismatic pouch cell
Replies: 7
Views: 1479

Re: A123 Systems 20Ah prismatic pouch cell

Not sure, might be. I wish A123 had made some 8 to 10Ah prismatics.
by TMaster
Dec 22 2012 2:21am
Forum: Battery Technology
Topic: LifePO4 higher charge amps more capacity?
Replies: 7
Views: 798

Re: LifePO4 higher charge amps more capacity?

You guys are right ;) So, tonight I discharged one of the higher charged amp rate packs and one of the lower amp rate packs. I took them both down to 3.0V per cell at the same low rate of 1.2 amps. (Thats actually about 90-95% of the capacity because of such a low amp rate draw). Turns out the charg...
by TMaster
Dec 18 2012 1:26am
Forum: Battery Technology
Topic: LifePO4 higher charge amps more capacity?
Replies: 7
Views: 798

Re: LifePO4 higher charge amps more capacity?

I'm going to discharge them all with the same amps and see how the capacities are. I will know then!
by TMaster
Dec 17 2012 6:58pm
Forum: Battery Technology
Topic: LifePO4 higher charge amps more capacity?
Replies: 7
Views: 798

Re: LifePO4 higher charge amps more capacity?

It's being read off the RC charger on how many mah was put in when the charge was done.
by TMaster
Dec 16 2012 11:36pm
Forum: EBike Technical
Topic: Glass puncture through the tire
Replies: 16
Views: 2138

Re: Glass puncture through the tire

Thanks guys, I cleaned it out and filled it with rubber cement. I will check it after every ride. They are steel bead tires, so They should hold up better then a folding tire. If get gets worse I will just use this as an excuse to upgrade my rear disc rotor to 203mm instead of the 185 I have on ther...
by TMaster
Dec 16 2012 12:17pm
Forum: Battery Technology
Topic: LifePO4 higher charge amps more capacity?
Replies: 7
Views: 798

LifePO4 higher charge amps more capacity?

Im working on a new charge setup. I Charged 2 of my packs at 4 amps and around 6100 Mah was put back in for both packs. I then charged the other two packs at 10 amps, and around 6300 mah was put back in. My question is, are the other two packs going to have more capacity the next time I ride? Or is ...
by TMaster
Dec 16 2012 2:53am
Forum: EBike Technical
Topic: Glass puncture through the tire
Replies: 16
Views: 2138

Glass puncture through the tire

I have a small 1/4" long cut in my rear CST cyclops pro tire. It is all the way through to the tube, but it didn't puncture the tube. I get up to speeds of 40+mph. Should I be worried? Should I try and clean it out and put in some rubber tire repair cement in the crack? I just would hate to hav...
by TMaster
Dec 04 2012 8:53pm
Forum: Battery Technology
Topic: Difference between 100ah & 60ah
Replies: 18
Views: 2266

Re: Difference between 100ah & 60ah

72V x 20Ah = 1440 Whr
48V x 30Ah = 1440 Whr

hmmm... :? :mrgreen:
by TMaster
Nov 11 2012 1:16pm
Forum: Battery Technology
Topic: Battery Charging and discharging????
Replies: 16
Views: 715

Re: Battery Charging and discharging????

Just a note, When I have a cell thats higher then the rest, and the balance charger is taking too long or the voltage wont come down on that cell; I use a 5mm LED and plug it into the balance connector on the cell thats higher. Let it sit for however long it needs to drop the voltage close to the ot...
by TMaster
Nov 09 2012 1:32pm
Forum: Battery Technology
Topic: 4mm Bullet Question
Replies: 9
Views: 1145

Re: 4mm Bullet Question

I run the HTX 4mm bullet connectors with 10AWG wire. I had to install the connectors in backwards (pushing the connector into the housing with a flat head screwdriver, not the normal way of pulling the wires through). I had to belt sand the shoulders off on each connector to a 45 degree slant so tha...
by TMaster
Nov 09 2012 12:11am
Forum: Battery Technology
Topic: Is using thick silicone wire a waste of money?
Replies: 22
Views: 2846

Re: Is using thick silicone wire a waste of money?

Great video!

I always go here to get continuous amp ratings for wires: then I add a little more for silicone
http://www.powerstream.com/Wire_Size.htm (scroll down to table)
by TMaster
Nov 04 2012 2:27pm
Forum: EBike Technical
Topic: Front Wheel Question
Replies: 7
Views: 615

Re: Front Wheel Question

I run the Cyclops 26" X 2.4 tires on my bike, and my front rim is 1.08" outter width, so less then 1" Inner width. The tire is a lot harder to get on the front wheel. I really have to press and pry with the tire levers, but it does fit and has been working great for many many miles. I...
by TMaster
Oct 27 2012 6:52pm
Forum: Battery Technology
Topic: Charging in series
Replies: 11
Views: 1287

Re: Charging in series

Use a multimeter and test the continuity all the way from the connector going into the charger to the connector on the balance board. Easy Peasey.
by TMaster
Oct 25 2012 3:09pm
Forum: Battery Technology
Topic: Charging in series
Replies: 11
Views: 1287

Re: Charging in series

Here is a pick of the balance boards. It's pretty simple. 5S in one connector, 5S in the other connector. All the negatives on one side lined up with the balance wire. Don't forget the two packs need to be wired in series to charge ports.