Search found 2638 matches

by Sunder
Dec 25 2018 6:14pm
Forum: Battery Technology
Topic: spiralling environmental cost, lithium batteries
Replies: 18
Views: 599

Re: spiralling environmental cost, lithium batteries

All that is would be optimism. Demand doubles, they use 10% less in a cell, we wind up needing 9x more lithium for 10x the useage. That still means electrics are just a niche. There will have to be batteries other than lithium. And probably no dominant chemistry unless we can grow it. Any ideas for...
by Sunder
Dec 20 2018 6:31pm
Forum: Battery Technology
Topic: 144v or 72v for motorcycle?
Replies: 11
Views: 452

Re: 144v or 72v for motorcycle?

FWIW, if the 20s BMSs still have the discharge protection (LVC/etc) but aren't used because of the limits of the voltage the output FETs can handle, then you could still use that protection by wiring up the outputs of eac of the BMSs to an AND gate I had considered that. FWIW, I think with LTO it's...
by Sunder
Dec 19 2018 6:04pm
Forum: Battery Technology
Topic: 144v or 72v for motorcycle?
Replies: 11
Views: 452

Re: 144v or 72v for motorcycle?

Thanks guys: @Dauntless. Thanks for the encouragement. I'm in the eye of a storm. I've taken 5 weeks leave to get away from it a bit, but I know what's waiting for me mid Jan. It's a bit of first world problem. I'm not starving, not divorcing, or anything like that, but it's sucked all the joy out o...
by Sunder
Dec 19 2018 1:42am
Forum: Battery Technology
Topic: 144v or 72v for motorcycle?
Replies: 11
Views: 452

144v or 72v for motorcycle?

Almost 6 months ago, I started a project to convert a Ninja 250R to a Ninja 230H (The H is for Hectowatt :D ). Back then, I built the batteries to 3 x 48v for a 144v system. I figure with a 100A sustainable current with higher peaks, going 72V wouldn't be that smart. The parts are available at 144v ...
by Sunder
Dec 10 2018 12:04am
Forum: E-Bike General Discussion
Topic: new eZip motor
Replies: 5376
Views: 348048

Re: new eZip motor

Very nice clean build. I like it.

I am going on holidays in 2 days time, but when I get back I hope to have a week to focus on my electric motorcycle conversion. As I get more time and energy, I am recovering the desire to work on it.
by Sunder
Nov 29 2018 6:22pm
Forum: E-Bike General Discussion
Topic: Setting maximum current - battery vs phase
Replies: 3
Views: 267

Re: Setting maximum current - battery vs phase

The Phaserunner self protects, if it gets too hot, it cuts power. Set the peak phase amps to protect your motor, as that can burn out. I found 40A continuous to be pessimistic. Only ever hit it when I stored it in a bag with no additional heat sinking. Facing the heat sink side forward so it gets wi...
by Sunder
Nov 26 2018 9:49pm
Forum: E-Bike General Discussion
Topic: new eZip motor
Replies: 5376
Views: 348048

Re: new eZip motor

Glad you're still posting. I haven't been on in about 3 weeks, so good to see you're still around. I haven't touched my big LTO batteries in the last 6 weeks either. Lost the passion for anything except unwinding when I get home. Work level has dropped off, but energy hasn't recovered. I'm paid well...
by Sunder
Oct 28 2018 11:49pm
Forum: General Discussion
Topic: Auction.com / automatic bidding software?
Replies: 20
Views: 899

Re: Auction.com / automatic bidding software?

Back to the original topic, Bid-sniping software works on eBay, because eBay does NOT extend its time when someone bids the last moment. Let's say you have a human watching it, and doesn't trust proxy bid. They are willing to bid say $100, but with 5 mins to go, the item is only at $40. If you enter...
by Sunder
Oct 25 2018 9:53am
Forum: E-Bike General Discussion
Topic: new eZip motor
Replies: 5376
Views: 348048

Re: new eZip motor

In all my years tweaking every last milliwatt of power out of the Cute Q100 series of motors, I never damaged or even wore the nylon gears.

I wore clutches and burned windings, but unless you got airborne with a geared hubmotor, I don't believe you will have any trouble with the nylon gears.
by Sunder
Oct 25 2018 9:39am
Forum: E-Bike General Discussion
Topic: Help magnets in hub motor
Replies: 21
Views: 691

Re: Help magnets in hub motor

Hi all, while I was replacing the hall effect sensors I damaged few magnets inside the stator. couldn't find an alternative! I believe they about 2.2 mm thick * 13.9mm wide *28mm long. Got N50 30mm x 10mm x 2mm from aliexpress that didn't work it's very weak compared with original one. any suggesti...
by Sunder
Oct 10 2018 4:15pm
Forum: E-Bike General Discussion
Topic: new eZip motor
Replies: 5376
Views: 348048

Re: new eZip motor

So where do people get electronic components from in the US? Wholesale here, we have Element 14 and RS Online. Retail we have Jaycar. Either way, if you can get to an electronic component retailer, you can calibrate your multimeter. Low resting voltage isn't the only reason for a BMS to trigger off....
by Sunder
Oct 07 2018 6:46am
Forum: E-Bike General Discussion
Topic: new eZip motor
Replies: 5376
Views: 348048

Re: new eZip motor

New unused Alkaline are about 1.63V ÷ 1.57V = 1.038 x 4.05V = 4.20V Looks like your 4.05V metering is actually very near 4.20V. You should confirm voltage against other meter, then adjust. If you have a radioshack or similar near you, you can also buy a Zener diode for a few cents as a reference. A...
by Sunder
Oct 03 2018 8:04pm
Forum: Items for Sale - New
Topic: Compact Field Oriented Controller, ASI + Grin, limited run
Replies: 1175
Views: 183465

Re: Compact Field Oriented Controller, ASI + Grin, limited run

I want similar controller for a reasonable price. The manufacturing cost for this, if made in bulk, I think should be not more than 10-15$. If you count how many people could potentially buy a replacement controller you could get much more profit if you sell it for affordable price. For current pri...
by Sunder
Oct 03 2018 6:25pm
Forum: E-Bike General Discussion
Topic: new eZip motor
Replies: 5376
Views: 348048

Re: new eZip motor

No, it can't tell that one string is only half the capacity. However, when it discharges, that string will hit low voltage first. When it's charging, that string will hit high voltage first. So it's not cutting off because one string fell apart. It's cutting off because that string is no longer beha...
by Sunder
Oct 01 2018 11:48pm
Forum: E-Bike General Discussion
Topic: new eZip motor
Replies: 5376
Views: 348048

Re: new eZip motor

Been a while since I've been reading this thread but it seems like not much has happened. Still struggling with batteries I see. Maybe you should save up and either get a high quality prebuilt one that you can't really abuse that easily, or build one out of really tough cells like LTO. My progress h...
by Sunder
Sep 26 2018 7:58pm
Forum: E-Bike General Discussion
Topic: Street-Legal BBSHD (in '250w' australia)
Replies: 25
Views: 870

Re: Street-Legal BBSHD (in '250w' australia)

"At the wheel" just means to measure output power, (i.e Motion), not input power (electricity).

The bigger issue is actually what role electronic governors have. 3000w motor with a 250w controller? How do you judge that?

It's not a great standard, to be honest.
by Sunder
Sep 26 2018 6:03pm
Forum: E-Bike General Discussion
Topic: Street-Legal BBSHD (in '250w' australia)
Replies: 25
Views: 870

Re: Street-Legal BBSHD (in '250w' australia)

I might pipe in, since we're in the same state. EN 15194 refers to a standard called ISO-60034-1, which is a standardised method for rating motors. I'm no engineer, but from my reading of it, the crux of it is that the continuous performance of a motor is the maximum load that can be applied to the ...
by Sunder
Sep 18 2018 12:44am
Forum: Battery Technology
Topic: How does ambient Temperature affect LiFePO4?
Replies: 7
Views: 318

Re: How does ambient Temperature affect LiFePO4?

I noticed performance impacts from about 15*C. Even the difference between riding to work first thing in the morning at 14*C, and riding home after at 17*C was quite noticeable. Probably wasn't very significant until about 10*C though. All this said, my packs were about 6 years old, and done a lot o...
by Sunder
Sep 11 2018 6:38pm
Forum: E-Bike General Discussion
Topic: Disadvantages of higher Battery Voltage
Replies: 38
Views: 1464

Re: Disadvantages of higher Battery Voltage

Motor heating primarily comes from the current flowing through the motor (phase amps). At different battery voltages, if your controller is limiting motor current to the same amount, the motor heating will be the same. If your higher voltage setup allows you to feed more current to the motor, it wi...
by Sunder
Sep 11 2018 2:46am
Forum: E-Bike General Discussion
Topic: Disadvantages of higher Battery Voltage
Replies: 38
Views: 1464

Re: Disadvantages of higher Battery Voltage

Alright, either I'm taking crazy pills here, or some eminent experts in the field have replied, and have failed to noticed that to get his simulation to work, he throttle limited both bikes. Higher voltages do not cause motors to heat up faster when you're throttle limiting them. 72v @ 12% throttle ...
by Sunder
Aug 30 2018 9:18pm
Forum: E-Bike General Discussion
Topic: new eZip motor
Replies: 5376
Views: 348048

Re: new eZip motor

Case design is a bit of an art. It's like designing an exhaust for a gas engine. There's a balance to achieve between flow rate and turbulence. There's usually a sweet spot in the middle for both. This is why I said you need to use baffles and fans to make sure you achieve that. I usually buy top of...
by Sunder
Aug 30 2018 5:12am
Forum: E-Bike General Discussion
Topic: new eZip motor
Replies: 5376
Views: 348048

Re: new eZip motor

Travelling light is easy when you have money. When I had planned to go to the UK, (Still am, just delayed), I was going to get an I9 based laptop, external GPU, USB TV and radio tuner, built in 4G modem, and a REALLY large hard drive. That's work, games, movies, TV, reading, everything all in one. I...
by Sunder
Aug 30 2018 4:38am
Forum: E-Bike General Discussion
Topic: new eZip motor
Replies: 5376
Views: 348048

Re: new eZip motor

I'm keeping an eye out on the i9-9900k when it comes out. My watercooled overclocked 3770k is getting a bit long in the tooth. I'm tossing up between going hardcore cooling and overclock - massive oversized peltier thats under driven (to increase efficiency and avoid condensation), or go itx based u...
by Sunder
Aug 29 2018 1:27am
Forum: Battery Technology
Topic: Spotweld prismatics? Or Fold and Clamp?
Replies: 17
Views: 436

Re: Spotweld prismatics? Or Fold and Clamp?

Hey mate. Sorry for the late reply. Been a bit flat out.

I'm pretty sure that the tabs are aluminium. They're the right colour, after abrading them, they cloud over really fast, and scratching them doesn't reveal any copper underneath.
by Sunder
Aug 26 2018 6:33pm
Forum: Battery Technology
Topic: Spotweld prismatics? Or Fold and Clamp?
Replies: 17
Views: 436

Re: Spotweld prismatics? Or Fold and Clamp?

999zip999 wrote:
Aug 26 2018 3:51pm
Ok but these cells were not meant to be soldered and if flexed will crack off.
Really? I thought soldering was meant to be the ideal way to do it.