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by neptronix
Apr 25, 2018 7:00 pm
Forum: E-Bike Reviews & Testing
Topic: Downtube 9FS folding bike review - my take
Replies: 0
Views: 97

Downtube 9FS folding bike review - my take

So yeah, i live in goathead country and have became pretty tired of pulling thorns out of tires and having tubes mutilated after every ride, even with tube liners, puncture proof tires, sealants, etc. I decided that my next bike would have motorcycle tires, period. So i went on a quest to find a 20 ...
by neptronix
Apr 25, 2018 2:11 pm
Forum: Forum Rules and Features
Topic: Why we had big downtime 04/22/18 and intermittent downtime since the upgrade
Replies: 9
Views: 404

Re: Why we had big downtime 04/22/18 and intermittent downtime since the upgrade

Yahoo!!! 2018-04-25 11_58_12-RDS · AWS Console.png As you can see, the database starts out with a lot of free ram and then starts using more memory to cache our huge database as time goes on. But then, it reaches a stasis point after 3 days. It was not doing this before. The curve just went down to ...
by neptronix
Apr 24, 2018 11:31 am
Forum: General Discussion
Topic: Forum software upgrade on 11/17/2017 technical issues thread
Replies: 147
Views: 13528

Re: Forum software upgrade on 11/17/2017 technical issues thread

Hey guys; i have some good news. A major piece of the puzzle is place for a fix of the http/https issue, and work will commence in the next week or two on the final fix :) Also, i modified the 'new posts' link to show a longer list of new posts. I had to patch the phpbb code to do this, as there's n...
by neptronix
Apr 24, 2018 11:21 am
Forum: Forum Rules and Features
Topic: Why we had big downtime 04/22/18 and intermittent downtime since the upgrade
Replies: 9
Views: 404

Re: Why we had big downtime 04/22/18 and intermittent downtime since the upgrade

Thanks for trying to be helpful but you're thinking a couple levels out of the scope of the problem. I am the guy you call when your linux server has gone tits up. There is no 'call a friend' option for these kinds of problems :lol: Anyway, i'm seeing what looks like a promising trend for the memory...
by neptronix
Apr 23, 2018 9:26 pm
Forum: Forum Rules and Features
Topic: Why we had big downtime 04/22/18 and intermittent downtime since the upgrade
Replies: 9
Views: 404

Re: Why we had big downtime 04/22/18 and intermittent downtime since the upgrade

Yeah, without revealing anything about our infrastructure, i'm aware of what you're talking about :) But we had an out of control memory leak on the database's part which would cause it to go into swap and then stall for hours and reboot itself. The newer version of the database wasn't responding to...
by neptronix
Apr 22, 2018 5:43 pm
Forum: E-Bike Technical
Topic: 8 speed cassette on mac hub motor?
Replies: 1
Views: 52

Re: 8 speed cassette on mac hub motor?

I can't say for sure, but the difference between an 8 speed and a 7 speed is just a spacer.

So if it doesn't fit, you can throw a spacer on and make it a 7 speed. The MAC is a pretty powerful motor and you won't need all 8 speeds anyway.
by neptronix
Apr 22, 2018 2:29 pm
Forum: Forum Rules and Features
Topic: Why we had big downtime 04/22/18 and intermittent downtime since the upgrade
Replies: 9
Views: 404

Re: Why we had big downtime 04/22/18 and intermittent downtime since the upgrade

Yep, the proper response to a memory leaking program is fixing the memory leak. As you found out, throwing more memory at it just simply prolongs the time till memory exhaustion. So if it's the database... think a latest stable "working" version would work? Pretty sure the best database systems are...
by neptronix
Apr 22, 2018 2:03 pm
Forum: Forum Rules and Features
Topic: Why we had big downtime 04/22/18 and intermittent downtime since the upgrade
Replies: 9
Views: 404

Why we had big downtime 04/22/18 and intermittent downtime since the upgrade

Hi all. When we moved from phpbb 3.0 to 3.2, we decided to use the newest version of the database server on AWS. It turned out that this version has a slow memory leak that would cause the server to stall for an hour, and then reboot on a 3 day cycle.. What we did was double the size of the memory o...
by neptronix
Apr 21, 2018 9:58 pm
Forum: Resources & EV Related Parts and Services
Topic: Duyunov wheel-hub motor
Replies: 18
Views: 1142

Re: Duyunov wheel-hub motor

I wish you the best, but frankly you first want me to register before I can view your webshop? Then you got "a secret forum"...... Well I am glad I am not a share holder in that company. Seems consensus is to make it as easy as possible to do a purchase. Not jumping trough loops to get there. If yo...
by neptronix
Apr 13, 2018 10:32 pm
Forum: E-Bike Technical
Topic: Xiongda YTW-06 mini hub motor
Replies: 36
Views: 1978

Re: Xiongda YTW-06 mini hub motor

Yeah, for your use you could certainly get away with overpowering the motor. When i use the term 'continuous', i mean literally running the motor at that power level for 24 hours, IE it will sustain that indefinitely. So there's lots of wiggle room between cooling and heating cycles in the kind of r...
by neptronix
Apr 12, 2018 9:54 am
Forum: Battery Technology
Topic: The poor mans cycle satiator
Replies: 14
Views: 704

Re: The poor mans cycle satiator

I like it. I still have my old Meanwell SP, and have been looking for sort of a higher powered alternative to my cycle satiator. In all honesty, if grin released a >500W cycle satiator, i'd be all over it just for the nice overall package, high efficiency, etc. But this is as close as you're gonna g...
by neptronix
Apr 12, 2018 8:43 am
Forum: E-Bike Technical
Topic: Xiongda YTW-06 mini hub motor
Replies: 36
Views: 1978

Re: Xiongda YTW-06 mini hub motor

Here is the power graph, just for reference. The maximum efficiency point is 333W on 36 volts / 11.1A on this ~230rpm wound motor pictured. I believe that this motor may handle 350-400 watts continuously on 36 volts. 48 volts might put you in 450-500 watt continuous territory in a 26 inch wheel or s...
by neptronix
Apr 11, 2018 10:27 am
Forum: E-Bike Technical
Topic: Xiongda YTW-06 mini hub motor
Replies: 36
Views: 1978

Re: Xiongda YTW-06 mini hub motor

Kinda sad to hear that it's on the loud side with a FOC controller. I'm sure that the higher pitch is more audible, due to the high rpm and how the human ear works.
I expect other dual reduction motors to have the same effect.

If anyone can get a video of the noise, that'd be really helpful.
by neptronix
Apr 09, 2018 12:51 pm
Forum: E-Bike Reviews & Testing
Topic: Luna Black Box: anyone tried it yet?
Replies: 4
Views: 378

Re: Luna Black Box: anyone tried it yet?

That's kinda cool, but why? A used computer + the correct controller is cheaper than this. $50 computers are everywhere. I'll admit, rolling my bike over to my desktop/laptop computer and dangling a cord out is a pain in the ass, but i wouldn't pay $150 and buy a piece of hardware that's specific to...
by neptronix
Apr 08, 2018 10:51 am
Forum: E-Bike General Discussion
Topic: is this site legit? recycles-ebike.com
Replies: 18
Views: 827

Re: is this site legit? recycles-ebike.com

Geez.. LG rates the F1L cell at 0.2C. Which means that an ideal pack size for a continuous 30 amp draw is more like 150AH. The optimistic 'vaping rating' is 4.8A. That pack would sag like crazy even on 20A. There are high capacity cells that are rated for 1-2C out there. No idea why this cell would ...
by neptronix
Apr 08, 2018 9:13 am
Forum: Battery Technology
Topic: MNKE IMR-26650 and Queen Battery QB26650 discharge test
Replies: 5
Views: 178

Re: MNKE IMR-26650 and Queen Battery QB26650 discharge test

Excellent little test. Yeah, its rather sad that we dont have good 26650s available to the hobbyist these days huh? I've always wanted to build a pack with some, for the sake of simplicity, but its just not happenning. Seems like the 2070 is the next best thing.
by neptronix
Apr 07, 2018 1:01 pm
Forum: E-Bike Reviews & Testing
Topic: My experience with "leafbike" electric bike kit
Replies: 23
Views: 9885

Re: My experience with "leafbike" electric bike kit

Their kits are terrible. I wouldn't touch them. The controllers are not matched to the motor's continuous capabilities, and as far as i know, not programmable. That 1000W motor is wound WAY too fast ( 40mph winding, which requires 2000W continuous, on a 1000W motor? WTF? ) That being said the 1500W ...
by neptronix
Apr 04, 2018 9:05 am
Forum: E-Bike Technical
Topic: Xiongda YTW-06 mini hub motor
Replies: 36
Views: 1978

Re: Xiongda YTW-06 mini hub motor

neptronix, I'd be very interested in seeing what you build with this motor. So I special-ordered this motor with a 120mm width axle since I'm using it in a single-speed. But the motor comes stock for 135mm dropouts and uses a 6 to 7-speed freewheel—no cassette version as of right now. I think a few...
by neptronix
Apr 03, 2018 6:42 pm
Forum: E-Bike Technical
Topic: Xiongda YTW-06 mini hub motor
Replies: 36
Views: 1978

Re: Xiongda YTW-06 mini hub motor

Hello, here is a video from the motor 290rpm, freewheel not so good: https://youtu.be/PpaGfM4vh8s The battery is 36V, the engine has a lot of power, on the mountain too, makes more noise at idle as in operation and under load, freewheel a bit stiff but maybe that will get better with time? Sorry my...
by neptronix
Apr 02, 2018 2:03 pm
Forum: E-Bike Technical
Topic: Xiongda YTW-06 mini hub motor
Replies: 36
Views: 1978

Re: Xiongda YTW-06 mini hub motor

Awesome! thanks for your report on this. I've really been thinking about building up a 700c wheel bike with one of these for months. This motor looks like just the ticket. 3lbs is freaking sweet. Can you do this thread a favor and upload a quick video of you spinning the wheel forward and backwards ...
by neptronix
Mar 20, 2018 2:19 pm
Forum: General Discussion
Topic: Forum software upgrade on 11/17/2017 technical issues thread
Replies: 147
Views: 13528

Re: Forum software upgrade on 11/17/2017 technical issues thread

Emails from the forum have http:// links which require a new login. Crud. I have that delegated to Samson for now. We can finally get security certificates that fix this http/https and www./no www. issue now, but our provider has yet to actually give instructions on how to install them ( yeah, than...
by neptronix
Mar 20, 2018 2:12 pm
Forum: Items for Sale - Used
Topic: FS (Vermont) - MAC 8T cassette on 20"
Replies: 10
Views: 389

Re: FS (Vermont) - MAC 8T cassette on 20"

Two hundo is a pretty good price for a complete wheel. I bet that thing rips in a 20" wheel. GL with the sale.
by neptronix
Mar 02, 2018 11:49 am
Forum: E-Bike General Discussion
Topic: The end of BionX?
Replies: 117
Views: 9026

Re: The end of BionX?

It sucks to see an original die, but i won't miss them. Bionx was the first kit i saw in late 2008 in California, when ebikes were just starting to get popular. Local dealers were asking $1000 for their 250w or was it.. 350w? kit. And that's without battery. There was nothing else on the shelves of ...