Search found 68 matches

by Synon
Jan 01 2019 2:53pm
Forum: E-Bike General Discussion
Topic: Video of ebike collision - be safe out there!
Replies: 23
Views: 1219

Re: Video of ebike collision - be safe out there!

Glad you weren't hurt, but yeah. You really could have avoided that by being more defensive. This driver encroached on your bike lane ... twice. My first reaction when drivers don't respect lanes is to back off and give them more space, not to pass. I may eventually be compelled to pass , but I'm u...
by Synon
Jan 01 2019 1:32pm
Forum: E-Bike General Discussion
Topic: Video of ebike collision - be safe out there!
Replies: 23
Views: 1219

Video of ebike collision - be safe out there!

https://www.youtube.com/watch?v=5WA974Csaus I'm sharing this video of an accident I was involved in a bit over a year ago to hopefully help others avoid similar situations. Thankfully the driver stopped and my injuries where minor, cold temperatures meant I was wearing several layers, the road rash ...
by Synon
Aug 11 2018 11:33pm
Forum: Items for Sale - Used
Topic: Cycle Analyst V3 CA3-DP
Replies: 3
Views: 516

Re: Cycle Analyst V3 CA3-DP

Sold!
by Synon
Aug 11 2018 2:07pm
Forum: Items for Sale - Used
Topic: Cycle Analyst V3 CA3-DP
Replies: 3
Views: 516

Cycle Analyst V3 CA3-DP

Cycle Analyst in great shape, zero issues, only used 1 season.

$120 - free shipping in the US
IMG_2079.JPG
by Synon
Apr 13 2018 9:30am
Forum: E-Bike Technical
Topic: Uses for a giant transformer?
Replies: 5
Views: 407

Re: Uses for a giant transformer?

Crap sorry, just made the images public.
by Synon
Apr 12 2018 7:54pm
Forum: E-Bike Technical
Topic: Uses for a giant transformer?
Replies: 5
Views: 407

Uses for a giant transformer?

Probably not applicable to ebikes so much, but this seems like the right place to get some direction. I acquired this massive transformer from a new (but sitting on a shelf for years) 5KV battery backup supply that was being thrown out. It probably weighs close to 30lbs. My electronics knowledge is ...
by Synon
Nov 27 2017 3:13pm
Forum: E-Bike General Discussion
Topic: Laptop Powered E-Bike
Replies: 21
Views: 2126

Re: Laptop Powered E-Bike

Nice build! My ebike is similar, large pack of used laptop cells. 14s20p total made up of two bricks of 7s20p, one for each pannier. This solved the 14s problem as well as my charger could support 7s, I would just put the two bricks in parallel and then charge both at the same time. I did not use a ...
by Synon
Jun 25 2017 1:26pm
Forum: E-Bike Technical
Topic: How do I figure out shunt value for my CA?
Replies: 4
Views: 456

Re: How do I figure out shunt value for my CA?

I have a Thunder 1220 charger and it does not have a "foam cut" feature that the iCharger does. Is there some other way to do this?
by Synon
Jun 25 2017 9:27am
Forum: E-Bike Technical
Topic: How do I figure out shunt value for my CA?
Replies: 4
Views: 456

How do I figure out shunt value for my CA?

I recently got a CA v3 for my bike (DP type even though the controller doesn't have a plug, not a big deal, just made the connections myself). I need to input the controller shunt value so I can get an accurate amp draw reading, but I don't know what that value is and my googling on figuring that ou...
by Synon
Jun 07 2017 2:51pm
Forum: E-Bike General Discussion
Topic: Finished bike - 2KwH 18650 battery with pics
Replies: 2
Views: 534

Finished bike - 2KwH 18650 battery with pics

Bike: Diamondback Response SE Motor: Yescomusa 48v 1000w Controller: Stock controller (I remember someone mentioned these are 30a) Battery: Used laptop 18650's - 20p14s total (2 20p7s packs) Top speed: 34mph / 55kmph So this has been a work in progress for a couple years. I started out loading some ...
by Synon
Apr 12 2017 1:04am
Forum: Battery Technology
Topic: RC Brushless DC motor 90A pair with 18650 cells?..
Replies: 8
Views: 931

Re: RC Brushless DC motor 90A pair with 18650 cells?..

You laptop batteries will work too you'll just need 10 times as many in parallel so get collecting. :D Question about this and laptop cells. Is it better to have more in parallel or shift a bit more towards a higher series count? For example a 48v 1kw motor with a large recycled 18650 pack, better ...
by Synon
Feb 27 2017 1:29am
Forum: Battery Technology
Topic: Solderless 18650 pack - looking for feedback
Replies: 7
Views: 1709

Solderless 18650 pack - looking for feedback

This is a simplified design based off the other solderless packs I've seen here, similar to the one Snath posted here a few years back. The block shown will be 24p3s, going to hopefully build 4 of these which fit flat in my panniers for a 48v motor. The brackets are sandwiched between 1/4" PVC, stri...
by Synon
Apr 28 2016 1:05pm
Forum: Battery Technology
Topic: Homemade Battery Build 48V 20Ah Finished
Replies: 2
Views: 535

Re: Homemade Battery Build 48V 20Ah Finished

What BMS did you use?
by Synon
Nov 01 2015 11:18am
Forum: Battery Technology
Topic: 18650 charging/discharging system - share yours!
Replies: 8
Views: 1779

Re: 18650 charging/discharging system - share yours!

question. how did you hook the light up for discharge? there is no positive or negative in AC. so any polarity will work? also can i just cut the cord off my desk lamp and wire it up? thanks. That's correct, doesn't matter which way it's wired up. Yes, just cut the cord, I used an old bathroom ligh...
by Synon
Oct 17 2015 2:20am
Forum: Battery Technology
Topic: 18650 charging/discharging system - share yours!
Replies: 8
Views: 1779

Re: 18650 charging/discharging system - share yours!

Dang Matt! That is one polished system, nicely done!
by Synon
Oct 16 2015 2:35pm
Forum: Battery Technology
Topic: 18650 charging/discharging system - share yours!
Replies: 8
Views: 1779

18650 charging/discharging system - share yours!

As someone who wanted to go with the "used laptop battery" route due to having a good source of batteries I recognized how tedious it is individually test the hundreds of cells I have, in fact if I did have to do them one at a time I would have given up a long time ago. So here are some jigs I built...
by Synon
Oct 14 2015 5:32pm
Forum: E-Bike General Discussion
Topic: Proper voltage for 18650 battery build?
Replies: 3
Views: 460

Re: Proper voltage for 18650 battery build?

Thanks for the clarification, that makes more sense! I think I may just go with the 15P, I guess if I really want a little more speed I can make a separate little booster pack. 9.3kg doesn't sound too bad considering I was using 23kg of lead acid batteries initially. I'd like to charge on the bike, ...
by Synon
Oct 14 2015 1:35pm
Forum: E-Bike General Discussion
Topic: Proper voltage for 18650 battery build?
Replies: 3
Views: 460

Proper voltage for 18650 battery build?

I'm in the process of building an 18650 battery pack for my 48v 1000w hub motor. The batteries are used laptop batteries, I've tested them all and I'm working on the final configuration of the pack. I built a triangle that can fit a max of 185 batteries so my question is this... I can either build a...
by Synon
Aug 25 2015 2:15pm
Forum: Battery Technology
Topic: 18650 spot welding -how to- ULTIMATE REPOSITORY
Replies: 759
Views: 157123

Re: 18650 spot welding -how to- ULTIMATE REPOSITORY

Nice! Thanks for sharing the nickle strip deal, just bought some. Anyone know how to add a timer to a welder? I recently made my own spot welder with a microwave transformer. I used one of the door switches to make a foot switch to turn on the welder, however my results are very inconsistent. If I c...
by Synon
Mar 09 2015 10:26am
Forum: E-Bike General Discussion
Topic: Charging question - not reading voltage correctly?
Replies: 2
Views: 340

Re: Charging question - not reading voltage correctly?

Found the problem and all is well! I've been using some extra alligator clips that had some fairly thin wire to reach the ends of my batteries (the ones that came with the charger are so short they are almost worthless). When I took these extra wires out of the equation the voltages read by the fluk...
by Synon
Mar 07 2015 11:38am
Forum: E-Bike General Discussion
Topic: Charging question - not reading voltage correctly?
Replies: 2
Views: 340

Charging question - not reading voltage correctly?

Just a little background, I'm using a Thunder 1220 charger and I'm working with used 18650 laptop cells (in this example, working with a single cell), I'm also using a Fluke 117 multimeter to monitor the cell. When I first turn the charger on the voltage read by the charger is 3.71v and the fluke re...
by Synon
Jan 05 2015 11:58pm
Forum: E-Bike General Discussion
Topic: Recommendations on voltmater/ammeter for daytime riding?
Replies: 6
Views: 730

Recommendations on voltmater/ammeter for daytime riding?

Yes, I know the cycle analyst is the way to go, but I'd like to hear about other options available that aren't $150. I'm just getting started and all I want to see is volts/amps at the moment and I figure that can be done at 1/10th the cost. I'm going to be running a 1kw yescom motor/controller, I b...
by Synon
Oct 03 2014 11:35am
Forum: Battery Technology
Topic: 18650/charger questions
Replies: 4
Views: 667

Re: 18650/charger questions

Yup, definitely not new and many are likely not great. I don't have a sense of a what a good cell and a bad cell look like when charging, how do you tell? Will the voltage on a good cell increase only a small amount when charging? If so, what is "a small amount"? I'm trying to figure out how I profi...
by Synon
Oct 03 2014 12:32am
Forum: Battery Technology
Topic: 18650/charger questions
Replies: 4
Views: 667

18650/charger questions

So I'm starting to charge 18650 cells that I've scavenged and need some feedback. I purchased a Thunder 1220 charger to use, I set the cell voltage to 4.2 (cells are in the 3.7 range). I put 10 cells in parallel to speed things along and apply only .5 amps, which is what... .05c? However the voltage...
by Synon
Sep 23 2014 1:28pm
Forum: Battery Technology
Topic: 18650 battery Kit development and discussion[testing done]
Replies: 198
Views: 35194

Re: 18650 battery Kit development and discussion

Great project! I'm definitely watching your progress on this. Curious why you decided on 10s (41v when cells are charged to 4.1v each) and 14s (57.4v total). Why not 12s which would be 49.2v? I'm still pretty new at all this, but I see a lot of kits that are 48v. How will the end user determine how ...