Search found 229 matches

by hias9
Dec 29 2019 3:49pm
Forum: Battery Technology
Topic: Eltek PCBs
Replies: 4
Views: 464

Re: Eltek PCBs

Thanks, I will contact him.

On eBay I only found some bigger PCBs, not the compact ones.
by hias9
Dec 28 2019 4:57pm
Forum: Battery Technology
Topic: Eltek PCBs
Replies: 4
Views: 464

Eltek PCBs

I am looking for a compact PCB which fits the Eltek Flatpack S.
I have a PCB made by Energus PS called Eltek Power V1.0 (made for Flatpack2, but also fits the Flatpack S. + and - are reversed)

Does somebody have some of these PCBs left?
by hias9
Nov 15 2019 6:40pm
Forum: Battery Technology
Topic: Max safe Voltage Difference when connecting two Batteries in parallel
Replies: 54
Views: 4366

Re: Max safe Voltage Difference when connecting two Batteries in parallel

I would not say that these chargers on Aliexpress are compact, way bigger than the usual 4A charger and a 1800W Flatpack S.
Suitable for charging at home, but not so nice to put it in a frame bag if the bike should be stealth.
by hias9
Nov 14 2019 11:20am
Forum: Battery Technology
Topic: Max safe Voltage Difference when connecting two Batteries in parallel
Replies: 54
Views: 4366

Re: Max safe Voltage Difference when connecting two Batteries in parallel

10-30°C (50-86°F)

I think you wanted to say they should be warmed up before charging if it would be 10-30°F which I absolutely agree with.
by hias9
Nov 14 2019 8:22am
Forum: Battery Technology
Topic: Max safe Voltage Difference when connecting two Batteries in parallel
Replies: 54
Views: 4366

Re: Max safe Voltage Difference when connecting two Batteries in parallel

If possible, stop working on the second pack, before you clear up what cells are suitable. Would be nice if the first battery could be dedicated to the slower bike. You need another charger for this pack, 1C charging is definitely no way for GA. Even 0,5C is too much. GA cells are good for the mild...
by hias9
Nov 13 2019 6:47pm
Forum: Battery Technology
Topic: Max safe Voltage Difference when connecting two Batteries in parallel
Replies: 54
Views: 4366

Re: Max safe Voltage Difference when connecting two Batteries in parallel

My question is very general, not about my specific case. One battery is finished and will probably be used on two bikes. The faster one will have about 3500W peak (7A per cell), 2000W continous. The slower one only about 1000W peak (2A per cell), about 600W continous. If 1C charging does not complet...
by hias9
Nov 13 2019 3:42pm
Forum: Battery Technology
Topic: Max safe Voltage Difference when connecting two Batteries in parallel
Replies: 54
Views: 4366

Re: Max safe Voltage Difference when connecting two Batteries in parallel

If you could do such an analysis, that would be really great.
Just use whatever is most comfortable for you as parameters.
If it does not matter, I would say 1C constant discharge and 70% DoD.
by hias9
Nov 13 2019 7:58am
Forum: Battery Technology
Topic: Max safe Voltage Difference when connecting two Batteries in parallel
Replies: 54
Views: 4366

Re: Max safe Voltage Difference when connecting two Batteries in parallel

It's a bit off-topic, but what I am curious to see would be a diagram how quick-charging affects cycle-life. Something like the following: The first graph using normal charging current (for GA: 0.3C), the second using quick charging current (for GA: 0.5C) and the third using an unhealthy quick charg...
by hias9
Nov 06 2019 3:59pm
Forum: Battery Technology
Topic: Max safe Voltage Difference when connecting two Batteries in parallel
Replies: 54
Views: 4366

Re: Max safe Voltage Difference when connecting two Batteries in parallel

I plan to quick-charge two 14S10P packs in parallel with a 1800W Flatpack S when making a break. Current would be around 0.45-0.5C. When riding alone, charging a single pack at 1800W would mean 0.9-1C which will probably have a significant negative effect on cycle life. Are there any numbers for the...
by hias9
Nov 06 2019 6:11am
Forum: Battery Technology
Topic: Max safe Voltage Difference when connecting two Batteries in parallel
Replies: 54
Views: 4366

Re: Max safe Voltage Difference when connecting two Batteries in parallel

I don't know exact values, but I think the resistance of the other parts could be less than 100mOhms, so it would be safer to calculate with a low resistance. Why would you not go over 0.3C maximum charging current? The current we are calculating is only a peak value, so I think a bit more than the ...
by hias9
Nov 06 2019 1:29am
Forum: Battery Technology
Topic: Max safe Voltage Difference when connecting two Batteries in parallel
Replies: 54
Views: 4366

Re: Max safe Voltage Difference when connecting two Batteries in parallel

Cells are 3500mAh GA Cells which have an internal resistance of 50mOhm according to the sheet. BMS allows 60amps continuous discharge and 50amps continuous charge. If we ignore the wire resistance, it would be 2x70mOhms for two 14S10P packs. So if we don't want to exceed a charging current of 1C, th...
by hias9
Nov 05 2019 2:56am
Forum: Battery Technology
Topic: Max safe Voltage Difference when connecting two Batteries in parallel
Replies: 54
Views: 4366

Max safe Voltage Difference when connecting two Batteries in parallel

What would you consider the maximum safe voltage difference when connecting two 14S10P 18650 batteries in parallel?

Is it possible to calculate the maximum equalizing current? ( maybe U(difference)/(Ri1+Ri2) )
by hias9
Sep 22 2019 2:07pm
Forum: EBike General Discussion
Topic: Axle trying to leave Dropouts when Tightening
Replies: 14
Views: 764

Re: Axle trying to leave Dropouts when Tightening

I am trying to fix this. Where do you upload your pictures?
edit: It should be working now.
by hias9
Sep 22 2019 2:02pm
Forum: EBike General Discussion
Topic: Axle trying to leave Dropouts when Tightening
Replies: 14
Views: 764

Re: Axle trying to leave Dropouts when Tightening

I design them using a 2D CAD software and have them water cut out of 10mm stainless steel.
On the left side it´s fixed to the IS2000 brake mount. On the right I drilled a hole and cut a thread.

Here is a picture of the left side:
Image
by hias9
Sep 22 2019 9:29am
Forum: EBike General Discussion
Topic: Axle trying to leave Dropouts when Tightening
Replies: 14
Views: 764

Re: Axle trying to leave Dropouts when Tightening

For my fast bike I have 10mm thick stainless steel torque arms on both sides water cutted. No problem at all at 22S and 200/450A. This is just for a 2KW (14S, 40 battery amps) city bike, which I used to ride without TAs. (only TA washers) Motor was overheating when riding hills, so I went to a sligh...
by hias9
Sep 21 2019 10:34pm
Forum: EBike General Discussion
Topic: Axle trying to leave Dropouts when Tightening
Replies: 14
Views: 764

Re: Axle trying to leave Dropouts when Tightening

Yea, that‘s exactly what happened. And it also happened on my other bike, but at higher tightening torque and the axle did not move that much. Maybe it happened because I could not hold and tighten at the same time cause I have a broken arm at the moment. Instead I was putting my weight on the saddl...
by hias9
Sep 21 2019 9:39pm
Forum: EBike General Discussion
Topic: Axle trying to leave Dropouts when Tightening
Replies: 14
Views: 764

Axle trying to leave Dropouts when Tightening

I have installed a slightly bigger hub motor on my slower bike today. When tightening the M14 nuts, at about 30Nm of tightening torque, the axle begins to leave its position. So when reaching about 50Nm of tightening torque, the axle will still be inside the dropout, but has already moved by a few m...
by hias9
Aug 30 2019 2:15pm
Forum: Items for Sale - New
Topic: Ebike Hub Motor overheating cooling solution - HUBSINK OFFICIAL THREAD
Replies: 119
Views: 21645

Re: Ebike Hub Motor overheating cooling solution - HUBSINK OFFICIAL THREAD

Is it better to grind off the black coating from the motor where the hubsinks will sit or does it not make a difference?
by hias9
Aug 26 2019 10:03pm
Forum: EBike Technical
Topic: Alternative to Chinese Handlebar 3-way Switches
Replies: 7
Views: 577

Re: Alternative to Chinese Handlebar 3-way Switches

I am actually thinking about buying a 3D printer :D

Do you print them in ABS or PLA?
by hias9
Aug 26 2019 4:59pm
Forum: EBike Technical
Topic: Alternative to Chinese Handlebar 3-way Switches
Replies: 7
Views: 577

Re: Alternative to Chinese Handlebar 3-way Switches

Ideal would be two waterproof 3way mini toggle switches on a bicycle handle bar mount.
Any ideas how to make this?
by hias9
Aug 25 2019 10:05pm
Forum: EBike Technical
Topic: Alternative to Chinese Handlebar 3-way Switches
Replies: 7
Views: 577

Alternative to Chinese Handlebar 3-way Switches

I have these two 3-way switches on the handlebar. These Chinese switches work, but I don't like how they look on a bicycle. Are there any alternatives? They should be water-protected and mounted on the handlebar. Nice if they would require less space than those two. https://s17.directupload.net/imag...
by hias9
Aug 22 2019 10:53pm
Forum: Items for Sale - New
Topic: Ebike Hub Motor overheating cooling solution - HUBSINK OFFICIAL THREAD
Replies: 119
Views: 21645

Re: Ebike Hub Motor overheating cooling solution - HUBSINK OFFICIAL THREAD

Thanks. They also mention that 2 15mm rings would be more efficient than a single 30mm ring. On all pictures with dual rings, the fins were lined up in a straight line. Wouldn't it be more efficient to line them up like this or would that be worse? https://s18.directupload.net/images/190823/temp/2fn...
by hias9
Aug 20 2019 5:57pm
Forum: Items for Sale - New
Topic: Ebike Hub Motor overheating cooling solution - HUBSINK OFFICIAL THREAD
Replies: 119
Views: 21645

Re: Ebike Hub Motor overheating cooling solution - HUBSINK OFFICIAL THREAD

Did anyone compare cooling performance of dual row hubsinks to single row hubsinks on motors like mxus 3k and qs205?
It would be nice to know if there is a significant boost in cooling performance.
by hias9
Apr 18 2019 5:57pm
Forum: EBike Technical
Topic: TO-220 FETs (De)Soldering Technique
Replies: 3
Views: 299

TO-220 FETs (De)Soldering Technique

I plan to upgrade the FETs of a KT controller. I did some tests trying to desolder the TO-220 FETs of a broken controller both with the soldering iron and the heatgun and I prefer the soldering iron at the moment. However I need high temperatures for both ways. The FETs I am desoldering don't need t...
by hias9
Apr 16 2019 12:04pm
Forum: EBike General Discussion
Topic: MXUS 3000 caliper clearance
Replies: 24
Views: 3400

Re: MXUS 3000 caliper clearance

The IS2000 to PM 8‘‘ adapter made by Formula is 10.7mm thick and fits.
The same adapter made by Shimano is slightly thicker (10.9mm) and also fits.