Recent content by Patriot

Yeah, I asked an electrician at work, he said is looks like a basic internal spring compression switch. And yes, I bought the cheapy light for about $3-4 from DX at the time, just to get the switch. The cheap light still works without the switch, so I put it on my daughters bike. As far as...

fechter, Something just dawned on me. What if I have a bad cell? I say this, because after hooking up the BMS with my new leads to the battery, I now see that my channel 7 and even channel 3 were extremely low. Both around 2.1v. Well, out of pure contempt, I hooked up the charger, and turned...

OK, this is what I have done so far. I replace these parts in the following channels. Ch. 7- U102, Q101, and U101. Ch. 8- U102 and Q101. Channel 8 now appears to be normal now. I replaced all three parts in ch.7, and I am still not getting 2.5v at the U102 point. It only says 0.1v. So, I...

Mouser parts showed up in the mail today. Well, I installed a new LM431 on channels 7 & 8. After reconnecting, the LED still came on for channel 8. Being stupid, I didn't check it when LM431 was removed, so I can only assume it's the Q101? What next?

fechter, I finally got around to ordering some spare parts today. I ordered 6 of each, LM431, TC54, and KSA931. AndyH said he replaced the BD136 for part Q101, but mine came with KSA931YTA originally, so I ordered that instead. I'm assuming it's the same thing. I plasn n just changing out the...

^^^^ Ok, I got some interesting results. I used both my meters. The first was my cheap digital meter. Digital 3.0v - 2.95v actual. 2.5v - 2.22v actual. 1.0v - 1.05v actual. The second was my old tiny pocket analog meter. It can only give me a 0.1v accuracy using the 10v range setting. Analog...

Ok, I'll do that first. I'd prefer it, without having to pullout the LM431.

fechter, I will connect it again and check all the voltages the way you show. I already know that I'm getting about 3v across the resistor when connected, and the led is lit. All the other cells do not have this, because their LED's are off, as they should be. I'll also do as you recommend...

^^^ Yes, I am reading 3.35v at the contact points of the big blue power resistors. Also, when I connected the lead back up again, I actually measured 2.95v across the resistor itself. I even measured from the resistor to the LED and got about the same. So, current is flowing through the...

OK, I checked the large resistor legs on the far end where they connect to the board, right next to the channel lead connections. Here's the voltages I got between them. 1-2 - 3.35v 2-3 - 0.00v 3-4 - 1.82v 5-6 - 3.35v 6-7 - 0.00v 7-8 - 1.83v So, the voltages appeared to have the same pattern...

^^^ I checked the voltages, cells 7,8 & 9 all are at 3.35v by my meter. I kept thinking it may be another flux short from installing the new leads, like I had when first building. but I cleaned with a Q-tip/acetone between the solder points, and there's nothing. Plus, to get the resistor warm...

fechter, Thanks for all your help. Now I have another problem I can't figure out. Today I got my BMS setup with a whole new set of channel leads. I eliminated the 17-pin connector, and just decided to go with eyelet terminals for each channel, and hook directly to the cells. Well...

I say build that snow bike up with a 5304/5 in the rear, and 84v of LiFePO.... then go mountain climbing. :mrgreen:

^^^ I tried a trigger throttle on my bike, but found it to be a real problem. I love the idea, and it felt great. However, no matter how I configured it, the throttle would not work, as it got in the way of my trigger shifter. I can't remount my shifter to a DT setup, because they are integrated...

^^^^UPDATE: As the battery got close to balancing, a couple things started to happen in the last 10-15mins. Most of the channels were close to each other in voltage. However, Channel-15 started lagging behind the rest (though still coming up slowly). Channel-7 started taking off ahead of the...