Search found 148 matches

by Indubitably
Jul 22, 2017 1:44 pm
Forum: Battery Technology
Topic: BMS for motorcycle battery?
Replies: 8
Views: 341

Re: BMS for motorcycle battery?

Yeah, that's what I'm thinking. I mean, why NOT balance the cells every time you drive if you can? The problem I have at this point is finding a 4 channel bms that is rated for that short 150 to 200amp discharge peak. Charging should be good, since bms modules with a 30amp charge rate are plentiful ...
by Indubitably
Jul 22, 2017 11:48 am
Forum: Battery Technology
Topic: BMS for motorcycle battery?
Replies: 8
Views: 341

Re: BMS for motorcycle battery?

No BMS, eh? So you're saying I should just manually top balance the cells and have something to disconnect the pack at low voltage? Still seems like I should have some over-charge protection for each of the cells since they're basically charging every time I get on the bike.
by Indubitably
Jul 21, 2017 9:08 pm
Forum: Battery Technology
Topic: BMS for motorcycle battery?
Replies: 8
Views: 341

BMS for motorcycle battery?

Anyone know of a BMS that would be suitable for use in a vehicle starter battery? They want about $170 for a 4ah motorcycle battery and I just can't bring myself to shell out that kind of cash for a battery with so little capacity. I was thinking maybe 4 15ah headway cells in series would do the tri...
by Indubitably
Aug 05, 2015 10:02 pm
Forum: Battery Technology
Topic: Choosing a power supply for paralell charging...
Replies: 0
Views: 210

Choosing a power supply for paralell charging...

I have about a dozen 40ah lifep04 batteries (split into 3 packs, of 4 parallel cells each) that I want to charge, and I was hoping somebody might be able to give me some advice on which power supply I should go with. The two that best seem to fit my needs are the meanwell rsp-500-3.3 (or possibly rs...
by Indubitably
Jan 26, 2013 9:38 pm
Forum: Battery Technology
Topic: EMC-2000 charger from ecity (1500 to 2000W)
Replies: 216
Views: 22815

Re: EMC-2000 charger from ecity (1500 to 2000W)

Mega: Not all that much really, the transformer is obviously your major stumbling block when it comes to weight. I suppose you could make it work with a coreless or aluminum wire transformer if you could find a way to cool it fast enough and were willing to trade volume for weight. Kepler: My unders...
by Indubitably
Jan 23, 2013 4:13 pm
Forum: Battery Technology
Topic: EMC-2000 charger from ecity (1500 to 2000W)
Replies: 216
Views: 22815

Re: EMC-2000 charger from ecity (1500 to 2000W)

I don't know about the 900w units, but the "2kw" units are pretty heavy. I dare say that you wouldn't want one tagging along for the ride on anything built for performance, even something in the motorcycle or scooter weight class. I suppose it might be worth the sacrifice for the right combo of high...
by Indubitably
Jan 14, 2013 6:33 pm
Forum: Battery Technology
Topic: EMC-2000 charger from ecity (1500 to 2000W)
Replies: 216
Views: 22815

Re: EMC-2000 charger from ecity (1500 to 2000W)

So I bought one of these bad boys about a year ago (EMC 2000) and at the time I was using a 68.5v pack, but recently decided to down size to a 24v pack (3.6v * 7 thundersky 40a) to run a geared RC motor system. I've never had any trouble with the charger at the original 68.5v setting, but the moment...
by Indubitably
Aug 09, 2012 5:50 am
Forum: Items for Sale - Used
Topic: Crystalyte 5302 up for grabs. Sale, or trade.
Replies: 29
Views: 3168

Re: Crystalyte 5302 up for grabs. Sale, or trade.

Wow, I hadn't realized just how much time had past by, since I last visited the site. I will soon have finished my third move in about a 6 month period, which is a bit nomdadic even by my standards, and I'm afraid these things just have a way of pushing all but the critical projects to the back burn...
by Indubitably
Jul 10, 2012 8:55 am
Forum: Items for Sale - Used
Topic: Crystalyte 5302 up for grabs. Sale, or trade.
Replies: 29
Views: 3168

Re: Crystalyte 5302 up for grabs. Sale, or trade.

Yeah, that nomenclature isn't really intended for buyers that are in the know and realize that the old x5s are different from the new c-lyte motors. They're pretty much just there to help people who are familiar with the old motors replace their stock with new c-lytes from the corresponding speed gr...
by Indubitably
Jul 10, 2012 5:03 am
Forum: Motor Technology
Topic: DIY AC TIG Welder using an e-bike controller?
Replies: 25
Views: 2617

Re: DIY AC TIG Welder using an e-bike controller?

So, apparently an ebike controller wouldn't really make sense as the inverter drive for a welding machine, but what about an induction heater? It seems to me that if you could target the ideal frequency for heating the filler metal instead of the base metal you could braze something like aluminum pr...
by Indubitably
Jul 01, 2012 7:32 pm
Forum: Items for Sale - Used
Topic: Crystalyte 5302 up for grabs. Sale, or trade.
Replies: 29
Views: 3168

Re: Crystalyte 5302 up for grabs. Sale, or trade.

3-4 ish but the 5302 is a bastard child and a controller killer but an x5 is still and x5... Your best bet is to convert it to 5304 =P This just doesn't really make any sense for me from a logistical standpoint. I'd be investing time and effort into rewinding perhaps the fastestest and most high fi...
by Indubitably
Jul 01, 2012 5:42 am
Forum: Items for Sale - Used
Topic: Crystalyte 5302 up for grabs. Sale, or trade.
Replies: 29
Views: 3168

Re: Crystalyte 5302 up for grabs. Sale, or trade.

Sorry there haven't been any updates as of late, but I was pretty busy with finals for a while there and just haven't been able to get back to my ebike stuff as much as I'd like to these days. At any rate, upon opening up the hub to replace the phase wires I noticed that it had what appears to be tw...
by Indubitably
Jun 08, 2012 3:10 am
Forum: E-Bike Non-hub Motor Drives
Topic: Pneumatic Transmission?
Replies: 19
Views: 1172

Re: Pneumatic Transmission?

http://www.endless-sphere.com/forums/viewtopic.php?f=28&t=10998 http://www.endless-sphere.com/forums/viewtopic.php?f=28&t=7358 Hah! Excellent, so I'm not entirely crazy after all. I was afraid I might have to couple a pair of them to get true torque reduction though, and this does seem to confirm t...
by Indubitably
Jun 08, 2012 1:35 am
Forum: E-Bike Non-hub Motor Drives
Topic: Pneumatic Transmission?
Replies: 19
Views: 1172

Re: Pneumatic Transmission?

Yeah, looks like my main problem was that I was simply failing to scale my mental model correctly. I was thinking we were talking coffee cup hot, when its looking a lot more like we're talking espresso machine hot, or hotter. If you visualize it in this range the whole thing goes to shit in no time ...
by Indubitably
Jun 03, 2012 6:26 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Pneumatic Transmission?
Replies: 19
Views: 1172

Re: Pneumatic Transmission?

I appreciate that you're taking the time to explain where I'm going wrong, because that's how my ideas improve, but there is obviously some sort of disconnect, because all I'm seeing here is a reiteration of the basic reasoning behind my argument, only with a contradicting conclusion. What I'm sayin...
by Indubitably
Jun 03, 2012 3:46 pm
Forum: E-Bike Non-hub Motor Drives
Topic: Pneumatic Transmission?
Replies: 19
Views: 1172

Re: Pneumatic Transmission?

I get that conventional wisdom says that compressed gas is inefficient, which is all well and good because most people don't stop to think about the fact that the majority of the kinetic energy being pumped into your system is going into thermal excitation of the gas molecules, but it is not the gas...
by Indubitably
Jun 03, 2012 5:55 am
Forum: E-Bike Non-hub Motor Drives
Topic: Pneumatic Transmission?
Replies: 19
Views: 1172

Pneumatic Transmission?

I've been farting around with the idea of using a high speed rc motor for my next build, simply because the little buggers are cheap as frak, crazy efficient, and weigh a fraction of what a comprably rated hub would weigh. The only problem is that no matter how I slice it, I keep coming back to the ...
by Indubitably
May 28, 2012 6:02 pm
Forum: Items for Sale - Used
Topic: Crystalyte 5302 up for grabs. Sale, or trade.
Replies: 29
Views: 3168

Re: Crystalyte 5302 up for grabs. Sale, or trade.

Geez. Just sell it and, put an eTek type motor on it, and be done. http://endless-sphere.com/forums/viewtopic.php?f=28&t=39299 There ya go. More power than you could ever use. If that's not enough, the dual stator version oughta work :) Actually, I was just thinking the same thing. Its funny, for m...
by Indubitably
May 27, 2012 5:43 pm
Forum: Items for Sale - Used
Topic: Crystalyte 5302 up for grabs. Sale, or trade.
Replies: 29
Views: 3168

Re: Crystalyte 5302 up for grabs. Sale, or trade.

Screenshot_2012-05-27-15-55-44.png 5302 in 16" vs Cromotor in 700c Don't go thinking this makes the 5302 a better motor than the Cromotor, its just wound for much higher speed. Screenshot_2012-05-27-16-20-49.png Cromotor is obviously current starved in this configuration at 100% throttle on the fla...
by Indubitably
May 27, 2012 6:30 am
Forum: Items for Sale - Used
Topic: Crystalyte 5302 up for grabs. Sale, or trade.
Replies: 29
Views: 3168

Re: Crystalyte 5302 up for grabs. Sale, or trade.

Just thought I should post an update since one or two people have recently expressed interest. Long story short, no more than a week or so after I posted the motor for sale, it twisted itself out of the dropouts (looks like a loose nut on the axel, and or a lack of proper torque arms was the culprat...
by Indubitably
May 14, 2012 12:13 am
Forum: Motor Technology
Topic: DIY AC TIG Welder using an e-bike controller?
Replies: 25
Views: 2617

Re: DIY AC TIG Welder using an e-bike controller?

I didn't heat treat my bike. It's good enough. You can't really glue aluminum though. Maybe braze and fiber wrap after. I don't know, it seems to me like people have glued aluminum to great effect in the past with bikes, and it is certainly common practice among the DIY aircraft folks (not to menti...
by Indubitably
May 13, 2012 7:28 pm
Forum: Battery Technology
Topic: Dr.Bass Steveo found 7s3p Module! Awesome Price!!
Replies: 592
Views: 56470

Re: Group Buy? Dr.Bass Steveo found 7s3p Module! Awesome Pri

I think you have to honestly ask yourself just how much your time and energy is really worth in the grand scheme of things before weighing the value of these cells. If you're not in a position like Oatnet to stockpile modules, it may very well be more profitable to pay a little more for domestically...
by Indubitably
May 13, 2012 4:59 pm
Forum: Motor Technology
Topic: DIY AC TIG Welder using an e-bike controller?
Replies: 25
Views: 2617

Re: DIY AC TIG Welder using an e-bike controller?

Well, I'm an idea man, always have been really, so theory is a good place for me to be, but sometimes when you've got a dozen different ideas all pulling you in different directions, there is a very real danger of either stalling out somewhere in the middle, or just plain biting off more than you ca...
by Indubitably
May 10, 2012 5:20 pm
Forum: Battery Technology
Topic: Dr.Bass Steveo found 7s3p Module! Awesome Price!!
Replies: 592
Views: 56470

Re: Group Buy? Dr.Bass Steveo found 7s3p Module! Awesome Pri

Yeah, pretty much the only way to make something like this work is to have enough buying power to subsidize the loss. If you can consistently buy the cells at $15 with 30% bad on average, but you can sell the cells for $30 a pop, you will come out of the deal smelling like roses. If you sink everyth...
by Indubitably
May 10, 2012 3:26 pm
Forum: Motor Technology
Topic: DIY AC TIG Welder using an e-bike controller?
Replies: 25
Views: 2617

Re: DIY AC TIG Welder using an e-bike controller?

Well, its not so much about building battery cases as wanting to learn how to do tig on aluminum. Granted, it would definitely prove usefull on my bike projects, and that is one of my major motivators for choosing aluminum tig in particular, but welding is a valuable skill in its own right. At first...