Search found 409 matches

by RVD
May 21 2018 5:21pm
Forum: Items for Sale - Used
Topic: big 18650 lithium cell battery 48v 50ah for sale (almost new)
Replies: 0
Views: 413

big 18650 lithium cell battery 48v 50ah for sale (almost new)

I am selling this big battery. I only used it once so it has only been charged one time so it's in excellent condition. I bought it for a project but have since abandoned the project and can use the money more than I can use this big battery. $700 and comes with the charger. Pics: https://photos.app...
by RVD
Oct 12 2016 10:18am
Forum: General Discussion
Topic: Samsung Note 7 fires
Replies: 30
Views: 1744

Re: Samsung Note 7 fires

like most of you, i ride my bike a lot (commute daily). i would honestly say that 90% of the people on the road are using their phones. most of my route is a bike lane but it's scary sometimes since you know they take their eyes off the road a lot. as for this phone, since it seems limited to the no...
by RVD
Sep 12 2016 12:43am
Forum: E-Bike Technical
Topic: motor started locking up, vibrating?
Replies: 11
Views: 708

Re: motor started locking up, vibrating?

good advice! i have one of those pointy tip ones and it was a pain getting the solder to flow.
by RVD
Sep 10 2016 1:05am
Forum: E-Bike Technical
Topic: motor started locking up, vibrating?
Replies: 11
Views: 708

Re: motor started locking up, vibrating?

i soldered 4mm bullet connectors today and it seems to work well! i suck at soldering but i got it done.
by RVD
Sep 06 2016 3:36pm
Forum: E-Bike Technical
Topic: motor started locking up, vibrating?
Replies: 11
Views: 708

Re: motor started locking up, vibrating?

maybe some soldered bullet connectors? Yes, I'm fond of those 4mm Bullets from RC world for phase power connections. I'm a fan of APP's but not for motor phase power connections. For Hall sensor wire connections I like Futaba or JR RC servo connectors. 2 of those handle 5-6 wires (some motors have ...
by RVD
Sep 06 2016 10:21am
Forum: E-Bike Technical
Topic: motor started locking up, vibrating?
Replies: 11
Views: 708

Re: motor started locking up, vibrating?

thanks amberwolf! yeah, i probably got my wire terminology mixed up. the 5 wires seem fine but i'll put in some new connectors for the 3 wires and see if that fixes this at least temporarily. i'll also look at using some other connectors. i don't want to solder them together because if i get a flat ...
by RVD
Sep 06 2016 1:05am
Forum: E-Bike Technical
Topic: motor started locking up, vibrating?
Replies: 11
Views: 708

motor started locking up, vibrating?

I have a fat bike with a MXUS 3000 watt hub motor. It was working well but on my last ride, I ran into a problem. I live on the top of a pretty big and steep hill (around 10-15% grade) but it's relatively short (maybe 200 meters or so). Most hub motors have trouble going up but my bafang 750w mid-dr...
by RVD
May 02 2016 2:50am
Forum: Battery Technology
Topic: 240v outlet
Replies: 14
Views: 1011

Re: 240v outlet

Quick update. I ended up going with #2. I bought a L6-20 plug, chopped off the existing chinese plug and found 3 wires - yellow w/ green stripe, brown, and blue. Some searching around on the internet basically came to a consensus that I should do the following: yellow w/ green stripe -> ground blue ...
by RVD
Apr 29 2016 5:07pm
Forum: Battery Technology
Topic: 240v outlet
Replies: 14
Views: 1011

Re: 240v outlet

ok i'll do #2. thanks for the advice folks!

amberwolf, glad to hear about the rebuild.

RVD.
by RVD
Apr 29 2016 11:40am
Forum: Battery Technology
Topic: 240v outlet
Replies: 14
Views: 1011

Re: 240v outlet

I ended up buying this one: http://www.aliexpress.com/item/Micro-pulse-787A-Battery-Spot-Welding-Machine-Recharge-Charging-Capability-Charger-foot-pedal-Butt-Welder-Welding/32570706183.html It's a 787A+ but I'm pretty sure that it's 220v only (that's what the seller said). I read on this site that 2...
by RVD
Apr 29 2016 1:13am
Forum: Battery Technology
Topic: 240v outlet
Replies: 14
Views: 1011

Re: 240v outlet

I did a little more research and it actually comes with a 3 prong plug but it's like the kind used in China/Australia/NZ/etc. It is a 220 version from aliexpress. It also comes with one of those universal travel adapters that convert it to USA 3 prong. Even my basic electrical knows enough that if I...
by RVD
Apr 28 2016 11:30pm
Forum: Battery Technology
Topic: 240v outlet
Replies: 14
Views: 1011

240v outlet

I have a 240v outlet in my garage. The receptacle is a L6-30r. I would like to buy a 220v tab welder from China. I am assuming that it will come with plugs used in China (the same ones as Australia, etc.) I have been looking for a converter that will convert the Chinese plug to L6-30p but can't seem...
by RVD
Apr 25 2016 1:34am
Forum: Battery Technology
Topic: parallel board malfunction?
Replies: 9
Views: 307

Re: parallel board malfunction?

ok cool. it's stored in an ammo can right now (ventilated can). i'll probably just toss it. it's a 4s pack so i'd be salvaging it to a 3s pack at best and simply not really worth my while. i don't know if one cell really got to 0 and another got overcharged to 7+ volts but that is what the voltage r...
by RVD
Apr 23 2016 11:08pm
Forum: Battery Technology
Topic: parallel board malfunction?
Replies: 9
Views: 307

Re: parallel board malfunction?

i finally brought the bad battery home last night and did some analysis. this is battery #1 so the one that i plugged in first...it was fine when i plugged it in. when i plugged in the 2nd battery, it started to spark, etc. so i pulled #2 only to notice that #1 also came out with the burned balance ...
by RVD
Apr 21 2016 1:24pm
Forum: Battery Technology
Topic: parallel board malfunction?
Replies: 9
Views: 307

Re: parallel board malfunction?

i have been using this board for about a month without any problems. i plugged in the main charging leads first (3 batteries) and then started plugging in the balance leads. the first balance lead was fine. the second balance lead is when i started to hear it clicking and burning so i immediately pu...
by RVD
Apr 19 2016 2:46pm
Forum: Battery Technology
Topic: parallel board malfunction?
Replies: 9
Views: 307

Re: parallel board malfunction?

hey dogman, thanks for the thoughts. really puzzling. I have done a lot of stupid things in my day including trying to hook up balance plugs in parallel while the mains were in series. The first time I did that was about 4 years ago and I was puzzled but I know now to look out for that. Although to ...
by RVD
Apr 18 2016 12:22pm
Forum: Battery Technology
Topic: parallel board malfunction?
Replies: 9
Views: 307

parallel board malfunction?

so, i was getting my charger set up to charge 3x4s 5ah turnigy lipos. i usually use a parallel charging board. it's a cheap board that i got from hobbyking last year. i don't use it that often but have been using it for the past few weeks and it seemed to work well. it's a 6x4s parallel charging boa...
by RVD
Mar 29 2016 3:20pm
Forum: E-Bike Non-hub Motor Drives
Topic: bbs02 steep hill best practices?
Replies: 28
Views: 3219

Re: bbs02 steep hill best practices?

the internal gear hub is a shimano nexus 8. it came with the bike (uptown breezer 8). i do think the bike can probably make it up the hill in gear 1 without me pedaling. i do feel resistance when i pedal though. i usually bike up at gear 2 these days and i do help out by pedaling. last night on my w...
by RVD
Mar 27 2016 8:14pm
Forum: E-Bike Non-hub Motor Drives
Topic: bbs02 steep hill best practices?
Replies: 28
Views: 3219

Re: bbs02 steep hill best practices?

I don't have a temperature gauge but when i put my hand to the motor just after climbing the hill it's barely warm (i can definitely keep my hand there forever). i have an internal gear hub so the chain line is not an issue for me. i didn't change out the front chainring but i did change out the bac...
by RVD
Mar 27 2016 8:08pm
Forum: E-Bike Non-hub Motor Drives
Topic: BBS02 750w on 52v 18650?
Replies: 6
Views: 1435

Re: BBS02 750w on 52v 18650?

ok i'll try this on 14s lipo first to see how performance it is before building the 18650 pack. i just use normal turnigy 20c lipos. i know that the c rating is grossly overrated but even if i only run some small 5ah batteries (so 14s1p using 5ah lipos), would that cause any problems? even at 25a wh...
by RVD
Mar 26 2016 2:49am
Forum: E-Bike Non-hub Motor Drives
Topic: BBS02 750w on 52v 18650?
Replies: 6
Views: 1435

BBS02 750w on 52v 18650?

I am thinking of building a new battery pack for my BBS02 750w. It is currently set for 48v which all I think means that it has a LVC set for 41v. I can look into changing this or I don't care...I always monitor my own voltage usage with a watt meter on my bike anyway. I am currently using lipo and ...
by RVD
Mar 21 2016 6:10pm
Forum: E-Bike Non-hub Motor Drives
Topic: bbs02 steep hill best practices?
Replies: 28
Views: 3219

Re: bbs02 steep hill best practices?

Well, it's March so my Nissan Leaf is gone and I'm riding my bike full time to/from work. I ride up this massive hill every day coming home and the BBS02 has been performing beautifully! The bike is kept relatively light because I'm using 12s1p turnigy lipo (44v 5ah). I'm using 3 X 4s 5ah batteries....
by RVD
Jan 28 2016 2:35am
Forum: E-Bike Non-hub Motor Drives
Topic: bbs02 steep hill best practices?
Replies: 28
Views: 3219

Re: bbs02 steep hill best practices?

Oh yeah, I did change out my rear cog on my Nexus 8 to a 22T to assist with the climbing. I did have to also get a new chain for the additional length. I can't wait until the weather gets better so that I can commute to work on this bike. My car lease (Nissan Leaf of course) is up in March so the ca...
by RVD
Jan 19 2016 2:17am
Forum: E-Bike Non-hub Motor Drives
Topic: bbs02 steep hill best practices?
Replies: 28
Views: 3219

Re: bbs02 steep hill best practices?

fwiw, i live in the Pacific Northwest so it has been raining a lot. i haven't been able to take my bike out for the last few months due to weather, coming home late at night, icy streets, etc. but today all of the stars aligned...i didn't have to go to work, the sun was out, and the temperature was ...
by RVD
Dec 29 2015 1:09pm
Forum: Battery Technology
Topic: DJI Phantom 3 Lipo Battery Issue
Replies: 3
Views: 251

Re: DJI Phantom 3 Lipo Battery Issue

ouch, the pictures of this guy's burned camera lenses is a sad sight...