Search found 1022 matches

by DasDouble
Feb 15, 2018 1:33 pm
Forum: Battery Technology
Topic: Samsung 30Q hard voltage drop under load?
Replies: 9
Views: 329

Re: Samsung 30Q hard voltage drop under load?

I measure this at the Adaptto Max-E Controller. I have a 20s 15p 300 cells Samsung 30Q pack. Maybe it is because of my poor nickel strips with its 0,15mm x 10mm x 3 for 15 cells in parallel? What mohm resistance reading are you getting on the adaptto statistics screen? Make sure your series connect...
by DasDouble
Feb 14, 2018 5:10 pm
Forum: Battery Technology
Topic: 18650 spot welding -how to- ULTIMATE REPOSITORY
Replies: 676
Views: 98968

Re: 18650 spot welding -how to- ULTIMATE REPOSITORY

I have just tried out a spot welder of a friend of mine who has built it by himself with the help of a 3€ timer from Amazon and an old microwafe + some AWG2 wires. I can tell you, I have never felt such a nice spot welder in my hands before. The microwave transformer is 230 : 1,5 and works perfeckt ...
by DasDouble
Feb 14, 2018 5:07 am
Forum: Battery Technology
Topic: Samsung 30Q hard voltage drop under load?
Replies: 9
Views: 329

Re: Samsung 30Q hard voltage drop under load?

If possible post a picture or a schematic of how you wired the back, but if only 3 nickel strips are used for the serial connections there is your problem, and if it is, I recommend you stop using the pack until fixed, the least that can happen is these 3 nickel strips melt, the worst they melt and...
by DasDouble
Feb 12, 2018 9:36 am
Forum: Battery Technology
Topic: Samsung 30Q hard voltage drop under load?
Replies: 9
Views: 329

Re: Samsung 30Q hard voltage drop under load?

I measure this at the Adaptto Max-E Controller. I have a 20s 15p 300 cells Samsung 30Q pack. Maybe it is because of my poor nickel strips with its 0,15mm x 10mm x 3 for 15 cells in parallel?
by DasDouble
Feb 10, 2018 12:09 am
Forum: Battery Technology
Topic: Samsung 30Q hard voltage drop under load?
Replies: 9
Views: 329

Samsung 30Q hard voltage drop under load?

My Samsung 30Q pack is dropping hard from about 3.9 to ~3.35v at the lowest when pushing it to 10A while it could theoretically get to 15A (says the supplier). Is that a normal thing today? Because in such case my Adaptto Controller says the battery is empty and stops giving me more current :roll: ....
by DasDouble
Jan 26, 2018 4:37 pm
Forum: Battery Technology
Topic: 25,2kW battery Pack [pictures coming soon]..
Replies: 0
Views: 183

25,2kW battery Pack [pictures coming soon]..

My battery is finally finished. I have upgraded it to the really, absolute maximum that no one has ever done before. It is capable to deliver up to 25,2kW continiously (peak). It weights 16kg and has a capacity of 3.2kWh. All done by myself over the years after improving and improving and more impro...
by DasDouble
Jan 12, 2018 9:26 pm
Forum: Items for Sale - New
Topic: DIY assembly kit for 18650 without spot welding/Soldering
Replies: 426
Views: 30385

Re: DIY assembly kit for 18650 without spot welding/Soldering

Info for following reader: Already got a reply from Vruzend in their known really polite way. I appreciate that. Hopefully I can fix that problem..
by DasDouble
Jan 12, 2018 6:42 pm
Forum: Items for Sale - New
Topic: DIY assembly kit for 18650 without spot welding/Soldering
Replies: 426
Views: 30385

Re: DIY assembly kit for 18650 without spot welding/Soldering

Just contacted them. I hope to hear from them tomorrow - I am more frustrated then I have ever been in my entire e-bike "carreer" (since 2016). I can´t even tell how much mad I am right now, damned.
by DasDouble
Jan 12, 2018 6:36 pm
Forum: Items for Sale - New
Topic: DIY assembly kit for 18650 without spot welding/Soldering
Replies: 426
Views: 30385

Re: DIY assembly kit for 18650 without spot welding/Soldering

Yeah I think so - even I have only 120 cells on this one. Im so freaking frustrated with it, I have tryed like pretty much everything you can imagine of - I hate it and Im normally a really optimistic guy about such things as I have built my own pack a while ago with by spot welding but this is driv...
by DasDouble
Jan 12, 2018 5:58 pm
Forum: Items for Sale - New
Topic: DIY assembly kit for 18650 without spot welding/Soldering
Replies: 426
Views: 30385

Re: DIY assembly kit for 18650 without spot welding/Soldering

Guys, Im having so much freaking trouble with a f*cking pack I have built with the VRUZEND kit, could you please help me out? So I have built that massive triangle pack for a friend of mine and the thing is that always some cell groups go to a really high voltage from like 3.48v to 3.5v in seconds w...
by DasDouble
Jan 07, 2018 8:50 am
Forum: Items for Sale - New
Topic: Bomber Style Frame Set (EBB) Black - $500 - 2 left
Replies: 141
Views: 14315

Re: Bomber Style Frame Set (EBB) Black - $500 - 2 left

555USD for Frame + Shock + fender + Motor + Controller? Damned, thats cheap!

Or is it only the frame? If so, no need for that.
by DasDouble
Jan 03, 2018 5:16 pm
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 1982
Views: 255484

Re: Definitive Tests on the Heating and Cooling of Hub Motors

More aluminum mass on the inside, heat sinks between the flanges, ferrofluid, pc fan then the last resort would be drilling holes. You could add the alum mass yourself, balancing it all out. Well my friend, you have just brought some crazy good idea right there...! More aluminium mass on the inside...
by DasDouble
Jan 03, 2018 2:48 pm
Forum: E-Bike General Discussion
Topic: Calculating the highest, possible speed you can get
Replies: 25
Views: 1610

Re: Calculating the highest, possible speed you can get

Edit: Another way to calculate it: speed: v(km/h)=n(r/min)*2rπ(m)*60/1000, n=load RPM, r=tire radius. For speed less than 100KPH, consider the Windage Resistance & Rolling resistance. the load RPM is appr 0.9 * no-load RPM. v(km/h)=0.9*n(r/min)*2rπ(m)*60/1000 For over 100KPH, V=0.85*RPM*2rπ*60/1000
by DasDouble
Jan 02, 2018 4:43 pm
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 1982
Views: 255484

Re: Definitive Tests on the Heating and Cooling of Hub Motors

So thats the next step further from now on? First ff, then hubsinks and then active cooling by a fan? Awesome, I like progress :)
by DasDouble
Dec 31, 2017 1:55 pm
Forum: General Discussion
Topic: Help me write the ES wiki https://endless-sphere.com/w
Replies: 88
Views: 336861

Re: Help me write the ES wiki

Alright, so how far are we yet? Is there already some link to the wiki? Can I help with writing articles of how to build / weld a battery even when it´s already finished? I will have plenty of time after June 2018 to spend on writing professional articles about that stuff I have learned in the past ...
by DasDouble
Dec 31, 2017 1:44 pm
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 1982
Views: 255484

Re: Definitive Tests on the Heating and Cooling of Hub Motors

Got the ff from merlin, the QS from Artur and the hubsinks from Sketchism. Well I can´t tell a difference between the QS and other brands as I have only experiences with the QS.

So you mean you have a liquid cooled motor? Awesome :D
by DasDouble
Dec 31, 2017 9:19 am
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 1982
Views: 255484

Re: Definitive Tests on the Heating and Cooling of Hub Motors

Well I have posted it someowhere before I think but here again my results:

Faster cooling while standing still with ff and hubsinks then without.
I have 8 ml ff inside. Some folks said 5-7 would be the best for the QS 205V3. More would add some resistance between hub and outher shell.
by DasDouble
Dec 31, 2017 5:24 am
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 1982
Views: 255484

Re: Definitive Tests on the Heating and Cooling of Hub Motors

Yeah I see, I already have ff and the hubsinks. I could now theoretically add another pair of hub sinks, that could help too.. Another question: Do you guys think, or maybe someone already did that, that some more CPU fans, placed on the whole sideplates of the hubbie could help cooling the motor? D...
by DasDouble
Dec 30, 2017 3:12 pm
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 1982
Views: 255484

Re: Definitive Tests on the Heating and Cooling of Hub Motors

I have asked because that´s the only thing which keeps me away from drilling some easy holes inside the side cover as I don´t want the motor to get damaged by stuff like dirt etc... :roll:
by DasDouble
Dec 29, 2017 8:54 pm
Forum: E-Bike Technical
Topic: Definitive Tests on the Heating and Cooling of Hub Motors
Replies: 1982
Views: 255484

Re: Definitive Tests on the Heating and Cooling of Hub Motors

What is the biggest problem of having a opened hubby? Rust? Dust? Dirt inside it? Could you not just put some membrane infront of the openings, so there can´t get some dust throught it??? :roll: Seems like a damn simple idea.. Too good to be true :roll: :lol:
by DasDouble
Dec 29, 2017 8:53 pm
Forum: Items for Sale - New
Topic: Liqid cooled hubmotor, >6kW continuous
Replies: 16
Views: 1224

Re: Liqid cooled hubmotor, >6kW continuous

760€ is a little bit hard, but it seems worth it.. subscribed. :pancake:
by DasDouble
Dec 29, 2017 8:43 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Sur-Ron - New Mid drive Bike from China
Replies: 475
Views: 26329

Re: Sur-Ron - New Mid drive Bike from China

How NOT to ride the Surron! KUwS3pxmnZo Oh damn, just saw that on my subscrition box on yt. Shit happens lol.. No, seriously, I made a similar mistake, when I tried to wheelie my bike. Endresult: Broken rear shock and some more mails with Anastasia hahaha :D :roll: :D Edit: hope the bike is ok. Edi...
by DasDouble
Dec 28, 2017 10:21 pm
Forum: E-Bike General Discussion
Topic: Summary of math formulas for calculating things for e-Bikes
Replies: 0
Views: 163

Summary of math formulas for calculating things for e-Bikes

So here real quick all sorts of math formulars I have written down in the past 2-3 years I figured out by myself for calculating stuff on my e-Bike. Calculating the highest, possible speed you can get I have tried myself on this to figure out the highest real speed I could get with 4kW motor. P(Moto...
by DasDouble
Dec 28, 2017 10:08 pm
Forum: Battery Technology
Topic: 18650 spot welding -how to- ULTIMATE REPOSITORY
Replies: 676
Views: 98968

Re: 18650 spot welding -how to- ULTIMATE REPOSITORY

Well I have had figured out once a genious formula for it, but I have deleted in from my calculator again so I tried it now.. Please be so kind and answer with a short "thanks Elias", or just "thank you", in case I could helped you somehow, as this makes me just happy when I could safe some time for...
by DasDouble
Dec 27, 2017 9:57 am
Forum: Battery Technology
Topic: 18650 spot welding -how to- ULTIMATE REPOSITORY
Replies: 676
Views: 98968

Re: 18650 spot welding -how to- ULTIMATE REPOSITORY

OK guys, so just here relly random the math formula to calculate the maximum amperage for your cable with a given cross-section in mm²: Cross-Section of given cable (mm²) / 0,812 (AWG20) * 11 (optimal °C) or * 16 (acceptable °C) or * 22 (poor/hot °C) => maximum amperage for your given cable. For ex...