Search found 1395 matches

by SlowCo
Feb 22 2015 6:47pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: jonescg's NEW electric racebike BUILD thread!
Replies: 1267
Views: 210054

Re: jonescg's NEW electric racebike BUILD thread!

Nice footage!

It does look like you could reduce your lap times by turning in a little later and using more track (tighter to the apexes) and maybe even ride different lines. But that's just from behind the keyboard in the rain soaked Netherlands being jealous... :mrgreen:
by SlowCo
Feb 09 2015 5:44pm
Forum: E-Bike Non-hub Motor Drives
Topic: LightningRods mid drive kit
Replies: 4957
Views: 620647

Re: LightningRods mid drive kit

Hey mate, what is that for a stick in between your swingarm? Is it a torquearm? your reffering to the black bar? from the seatpost tube back to the rear axle? - yes its the "Floating brake" strut. keeps the rear brake parallel to the seattube - so the braking doesnt affect the suspension. KONA call...
by SlowCo
Feb 05 2015 11:03am
Forum: Battery Technology
Topic: Did I let my LiFePo4 pack die?
Replies: 110
Views: 10268

Re: Did I let my LiFePo4 pack die?

Maybe my unintended test of leaving my LiFePo4 pack uncharged for a year thus letting the cell voltage drop to 1.3V before bringing it back to life wasn't completely useless...
by SlowCo
Feb 05 2015 10:35am
Forum: Battery Technology
Topic: Did I let my LiFePo4 pack die?
Replies: 110
Views: 10268

Re: Did I let my LiFePo4 pack die?

I'll just add the bus wire to the back then. I measured the cells again and the are still at 3.28V each with the total pack voltage at 52.4V (appr. 3.275V/cell). I hope it is okay to leave the battery pack as is for a while with the connector for the sense wires disconnected and the BMS switch to th...
by SlowCo
Feb 05 2015 10:28am
Forum: E-Bike Non-hub Motor Drives
Topic: play save guys ..
Replies: 13
Views: 1232

Re: play save guys ..

Were they RC LiPo cells?
by SlowCo
Feb 05 2015 9:47am
Forum: E-Bike Non-hub Motor Drives
Topic: play save guys ..
Replies: 13
Views: 1232

Re: play save guys ..

Ouch, glad the rest didn't burn down!

What was the problem that caused it?
by SlowCo
Feb 05 2015 7:49am
Forum: Battery Technology
Topic: Did I let my LiFePo4 pack die?
Replies: 110
Views: 10268

Re: Did I let my LiFePo4 pack die?

so i recommended a really simple fix to take maybe 12 seconds to do but actually ended up costing $800 in wasted time over three days. :oops: :oops: :oops: I bow my head in shame and will go stand in the corner... :wink: Reading back it seems obvious that I was completely focused on the current flo...
by SlowCo
Feb 03 2015 6:56pm
Forum: Battery Technology
Topic: Did I let my LiFePo4 pack die?
Replies: 110
Views: 10268

Re: Did I let my LiFePo4 pack die?

So soldering a bus wire in the back would still improve/lessen the voltage drop?
FETs rear short bus wire.jpg
FETs rear short bus wire.jpg (124.25 KiB) Viewed 1150 times
by SlowCo
Feb 03 2015 5:54pm
Forum: Battery Technology
Topic: Did I let my LiFePo4 pack die?
Replies: 110
Views: 10268

Re: Did I let my LiFePo4 pack die?

I had an idea to make an aluminum heat sink for the FETS that hopefully will also act as bus wire to let the current flow without the voltage dropping between FETs. Will this work or should I still solder a bus wire to the back?
Aluminum heatsink FETs.jpg
Aluminum heatsink FETs 2.jpg
Aluminum heatsink FETs 2.jpg (148.49 KiB) Viewed 990 times
by SlowCo
Feb 02 2015 2:29pm
Forum: Battery Technology
Topic: Did I let my LiFePo4 pack die?
Replies: 110
Views: 10268

Re: Did I let my LiFePo4 pack die?

Okay I will start a new thread on the charger soon but first I have to finish the BMS bus wire mod. I'll post a photo of it here to conclude this thread.
by SlowCo
Feb 02 2015 10:58am
Forum: Battery Technology
Topic: Did I let my LiFePo4 pack die?
Replies: 110
Views: 10268

Re: Did I let my LiFePo4 pack die?

That is indeed the same sticker that I have on my controller. A quick search turned up the manufacturer on tradesoon.com with the following specs for this controller: http://www.tradesoon.com/pro-cate/automobiles-motorcycles/electric-motorcycles/brushless-dc-motor-controller_335691.htm So the 40A co...
by SlowCo
Feb 01 2015 6:40pm
Forum: Battery Technology
Topic: Did I let my LiFePo4 pack die?
Replies: 110
Views: 10268

Re: Did I let my LiFePo4 pack die?

Just found the specs for the controller that came with my kit: Brushless DC Motor Controller for Electric Bicycles Specifications: Model: SYK-48-100W Voltage: 48V Power: 1000W Current: 40A Would that mean the maximum current the controller will take is 40A at peak value and that the nominal current ...
by SlowCo
Feb 01 2015 6:21pm
Forum: Battery Technology
Topic: Did I let my LiFePo4 pack die?
Replies: 110
Views: 10268

Re: Did I let my LiFePo4 pack die?

Thanks dnmun, I'll solder on the bus wire later this week. Earlier in the thread you also mentioned putting 4 (not 8?) of the same MOSFETs in parallel to the existing ones on the board. Is that also a wise upgrade to make the discharging more reliable? Or will it be fine with the bus wire mod? I do...
by SlowCo
Feb 01 2015 4:20pm
Forum: Battery Technology
Topic: Did I let my LiFePo4 pack die?
Replies: 110
Views: 10268

Re: Did I let my LiFePo4 pack die?

The wire won't be a problem as I already have some lying around. This is more of a mystery to me: Thanks dnmun, I'll solder on the bus wire later this week. Earlier in the thread you also mentioned putting 4 (not 8?) of the same MOSFETs in parallel to the existing ones on the board. Is that also a w...
by SlowCo
Feb 01 2015 3:43pm
Forum: Battery Technology
Topic: Did I let my LiFePo4 pack die?
Replies: 110
Views: 10268

Re: Did I let my LiFePo4 pack die?

Thanks dnmun, I'll solder on the bus wire later this week. Earlier in the thread you also mentioned putting 4 (not 8?) of the same MOSFETs in parallel to the existing ones on the board. Is that also a wise upgrade to make the discharging more reliable? Or will it be fine with the bus wire mod? I do ...
by SlowCo
Feb 01 2015 3:07pm
Forum: Battery Technology
Topic: Did I let my LiFePo4 pack die?
Replies: 110
Views: 10268

Re: Did I let my LiFePo4 pack die?

Is the shorter (than the length of the FETs) buswire that is only soldered at the ends the best solution for the uniform voltage across all FETs?: FETs rear short bus wire.jpg Or a longer (length of the FETs) bus wire only soldered at the ends: FETs rear longer bus wire.jpg Or a longer (length of th...
by SlowCo
Feb 01 2015 11:38am
Forum: Battery Technology
Topic: Did I let my LiFePo4 pack die?
Replies: 110
Views: 10268

Re: Did I let my LiFePo4 pack die?

Is this what you mean?:
FETs front bus wire.jpg
FETs front bus wire.jpg (113.28 KiB) Viewed 1842 times
And is the front better than the rear (more space) or even better on both sides?
FETs rear bus wire.jpg
FETs rear bus wire.jpg (241.29 KiB) Viewed 743 times
by SlowCo
Feb 01 2015 11:19am
Forum: Battery Technology
Topic: One more no “solder”, no tools, no skills, 18650 pack build.
Replies: 61
Views: 8766

Re: One more no “solder”, no tools, no skills, 18650 pack bu

Although I'm a lot younger at 42 I still rode a (hand)bike until I got severe shoulder problems. Then I rode a normal sports bicycle until the only knee I have left began giving in. It was quite amusing trying to set of and come to a halt with one clip on pedal....(I only fell 3 times!) Here's proof...
by SlowCo
Feb 01 2015 10:16am
Forum: Battery Technology
Topic: Did I let my LiFePo4 pack die?
Replies: 110
Views: 10268

Re: Did I let my LiFePo4 pack die?

If I understand correctly I can just lay a bare copper wire on the board above the tabs of the FETs and solder it at the ends and once in a while above the tabs to the metal surface where the tabs are screwed to? To visualize my thinking:
Bus wire FETS.jpg
Bus wire FETS.jpg (75.56 KiB) Viewed 1852 times
Is that correct?
by SlowCo
Feb 01 2015 9:46am
Forum: Battery Technology
Topic: Did I let my LiFePo4 pack die?
Replies: 110
Views: 10268

Re: Did I let my LiFePo4 pack die?

dnmun, thanks for taking the time to explain further. Much appreciated and I like the idea to make the BMS better and more reliable. I will have to read your post again a few times to better understand what you're saying. For now and future reference I'll post the close ups of the FET's front and re...
by SlowCo
Feb 01 2015 9:05am
Forum: Battery Technology
Topic: One more no “solder”, no tools, no skills, 18650 pack build.
Replies: 61
Views: 8766

Re: One more no “solder”, no tools, no skills, 18650 pack bu

People over 60 years old does not ride bicycles. Glad I came across this post so I can tell my parents (71 & 72yrs) to stop riding their bicycles... :lol: I'm afraid I live in a country where many people keep riding bicycles as long as they can. Not strange for a flat country that has more bicycles...
by SlowCo
Feb 01 2015 8:15am
Forum: Battery Technology
Topic: Did I let my LiFePo4 pack die?
Replies: 110
Views: 10268

Re: Did I let my LiFePo4 pack die?

But the advice given above goes (way) over my head... :oops: Are you implying that electricians and electronics engineers who created and assembled your battery are idiots and the opinion of an anonymous person measure up more? Your next step is to make this ebike to become real and not imaginary a...
by SlowCo
Feb 01 2015 3:47am
Forum: Battery Technology
Topic: Did I let my LiFePo4 pack die?
Replies: 110
Views: 10268

Re: Did I let my LiFePo4 pack die?

i looked up the mosfets, RuiChip RU6099R so 4 of them in parallel should be able to handle 3C from that pack. i would add a link using a wire soldered into a little terminal ring that could be put under the nut or screw head on two mosfets on the opposing sides so there would be a better current pa...
by SlowCo
Jan 30 2015 7:04pm
Forum: Battery Technology
Topic: Did I let my LiFePo4 pack die?
Replies: 110
Views: 10268

Re: Did I let my LiFePo4 pack die?

yep. it is ok to leave it until later. congratulation. you fixed it. Thanks to you and the others that helped! I have just disconnected the charger after approximately 45 minutes of charging. All the cells now measured an equal 3.30V and total pack voltage is at 52.8V :D :D :D (can you tell I'm VER...
by SlowCo
Jan 30 2015 6:05pm
Forum: Battery Technology
Topic: Did I let my LiFePo4 pack die?
Replies: 110
Views: 10268

Re: Did I let my LiFePo4 pack die?

A measuring.jpg A measuring 2.jpg A measuring 3.jpg As I couldn't get the probes into the green wires (solder to far inside and plastic too hard) I thought up a very professional way of attaching the probes... But it worked! I plugged in the charger, it switched on immediately and was giving 5.2A t...