Search found 25 matches

by sven_nilsson
Jan 25 2016 5:15am
Forum: E-Bike Reviews & Testing
Topic: Sabvoton SVMC072150 controller review, variable regen *PICS*
Replies: 316
Views: 52846

Re: Sabvoton SVMC072150 controller review, variable regen *P

Definitely a bug yes, the UI should not allow illegal input values. I had kind of foreseen that something like this might happen so I added a 150amp mains switch to my bike. Just in case the other power switch fails to respond for some reason. But in the heat of the moment, it is uncertain if you wo...
by sven_nilsson
Jan 24 2016 1:04pm
Forum: E-Bike Reviews & Testing
Topic: Sabvoton SVMC072150 controller review, variable regen *PICS*
Replies: 316
Views: 52846

Re: Sabvoton SVMC072150 controller review, variable regen *P

I finished my e-bike project today and just want to warn everyone to be careful with the "Accelerate time" setting on this controller. According to my findings, when set somewhere above 3000ms, it will convert your e-bike to a death trap. Everything seems fine, but after you apply even the tiniest a...
by sven_nilsson
Dec 05 2014 8:13am
Forum: Battery Technology
Topic: Avoiding fake batteries - how?
Replies: 47
Views: 3983

Re: Avoiding fake batteries - how?

I'm not going to return them. This post was mostly to show what you can expect to get when ordering from a chinese source. I don't need extreme amps either, I choose A123 because I was hoping for better cycle life and higher overall quality than the competition. About my 1S8P welded packs, these wer...
by sven_nilsson
Dec 04 2014 6:38pm
Forum: Battery Technology
Topic: Avoiding fake batteries - how?
Replies: 47
Views: 3983

Re: Avoiding fake batteries - how?

Thanks for the feedback. Yeah, these cells are an undefined entity at this time. The only thing that I feel somewhat confident about is that they originate from an A123 factory. They could also be A-grade cells that are being sold as B-grade because the chinese market does not have high enough deman...
by sven_nilsson
Dec 04 2014 11:33am
Forum: Battery Technology
Topic: Avoiding fake batteries - how?
Replies: 47
Views: 3983

Re: Avoiding fake batteries - how?

why not post a picture? Simply because I can find better pictures of my cells (that I know are the same) on the web. There is no chance to capture that laser etching using a cheap camera. Anyway, now that you say the A123 report appears genuine, I see that this report falsifies the claim that B-gra...
by sven_nilsson
Dec 04 2014 8:36am
Forum: Battery Technology
Topic: Avoiding fake batteries - how?
Replies: 47
Views: 3983

Re: Avoiding fake batteries - how?

Yes there is a barcode under the sleeve. And not only that, there is also a somewhat faint printed text "A123 SYSTEMS" under it. The following info is what made me believe it is b-grade cells: http://e-motion.lt/wp-content/uploads/2010/04/A123_26650_Pirate_cell_report.pdf http://www.multi-rotor.co.u...
by sven_nilsson
Dec 03 2014 8:12am
Forum: Battery Technology
Topic: Avoiding fake batteries - how?
Replies: 47
Views: 3983

Re: Avoiding fake batteries - how?

They look exactly like this

Image
by sven_nilsson
Dec 03 2014 5:53am
Forum: Battery Technology
Topic: Avoiding fake batteries - how?
Replies: 47
Views: 3983

Re: Avoiding fake batteries - how?

Hi! I recently purchased some A123 ANR26650M1B cells from HK. The cells delivered did not match the picures shown to me when ordering. There is no A123 logo, and the model number says "ANR26650" instead of "ANR26650M1B". According to some info I found, they maybe be real A123 cells but B-grade. Reje...
by sven_nilsson
Sep 19 2014 5:10am
Forum: E-Bike Reviews & Testing
Topic: Sabvoton SVMC072150 controller review, variable regen *PICS*
Replies: 316
Views: 52846

Re: Sabvoton SVMC072150 controller review, variable regen *P

Alright, so they forgot to install the sticker on mine, or it is counterfeit :)

Did you notice how the software is zipped up in a folder structure that contains chinese characters?
It will refuse to run/install unless you rename it. Very user friendly indeed...
by sven_nilsson
Sep 18 2014 10:09am
Forum: E-Bike Reviews & Testing
Topic: Sabvoton SVMC072150 controller review, variable regen *PICS*
Replies: 316
Views: 52846

Re: Sabvoton SVMC072150 controller review, variable regen *P

They have MUCH more heat sinking than the Xie Chang setups + over temperature protection. I'm also impressed with the sturdy design. Although of huge size, the controller is not very heavy. The software could be much better though. It does not feel like a consumer grade software at all, but rather ...
by sven_nilsson
Sep 16 2014 4:29pm
Forum: E-Bike Reviews & Testing
Topic: Sabvoton SVMC072150 controller review, variable regen *PICS*
Replies: 316
Views: 52846

Re: Sabvoton SVMC072150 controller review, variable regen *P

zombiess wrote:To program it you will need > 36V powering the controller.
36V... awww so close :)

Thanks a bunch, it works now. I combined my PSU with a 12V battery and was even able to get it spinning.
by sven_nilsson
Sep 15 2014 4:15pm
Forum: E-Bike Reviews & Testing
Topic: Sabvoton SVMC072150 controller review, variable regen *PICS*
Replies: 316
Views: 52846

Re: Sabvoton SVMC072150 controller review, variable regen *P

Hi there! Could someone please tell me if the controller requires a battery connection to be programmed via USB ? I installed the driver/software and I'm able to connect to COM19 which is the 485 interface. The TX transmit light in the software is flashing, but RX is dead so there is no response fro...
by sven_nilsson
Aug 17 2014 9:57am
Forum: E-Bike Reviews & Testing
Topic: Sabvoton SVMC072150 controller review, variable regen *PICS*
Replies: 316
Views: 52846

Re: Sabvoton SVMC072150 controller review, variable regen *P

Thanks a bunch for the advice! My project is this huge trekking bike. The top tube is at the same height as my waist - you have to be real careful when you're going to stop, or it will hurt your balls big time :) Using 20-24 20Ah cells, since the bike is huge and has this rather unusual placement of...
by sven_nilsson
Aug 16 2014 2:52pm
Forum: E-Bike Reviews & Testing
Topic: Sabvoton SVMC072150 controller review, variable regen *PICS*
Replies: 316
Views: 52846

Re: Sabvoton SVMC072150 controller review, variable regen *P

Hi! I'll use prismatic LiFePO4, 3.2V. 30 cells make 96V which is over the limit, as stated here: http://www.sabvoton.com/product/72v-6kw-brushless-motor-controller.html#.U--1mfmSxNQ SVMC072150 72V 150A 350A 95V I first thought about using 25 cells (80V) so that you can charge the cells with say 3.8V...
by sven_nilsson
Aug 16 2014 5:58am
Forum: E-Bike Reviews & Testing
Topic: Sabvoton SVMC072150 controller review, variable regen *PICS*
Replies: 316
Views: 52846

Re: Sabvoton SVMC072150 controller review, variable regen *P

You can't deny though that 30s will give more speed (speed, not accelleration) than 20s, and that the motor on 30s will accellerate strongly into the higher rpms. I just purchased this 72V 150A controller and need some guidance on how many cells to use. I read that the voltage protection limit is 9...
by sven_nilsson
Jun 20 2014 10:39am
Forum: E-Bike General Discussion
Topic: Finland increasing e-bike power limit from 250W to 1000W
Replies: 24
Views: 2661

Re: Finland increasing e-bike power limit from 250W to 1000W

gogo wrote:Weight only hurts acceleration, not top speed.
on flat ground, and assuming that the higher weight does not increase friction of the wheels, yes
by sven_nilsson
Jun 20 2014 5:31am
Forum: E-Bike General Discussion
Topic: Finland increasing e-bike power limit from 250W to 1000W
Replies: 24
Views: 2661

Re: Finland increasing e-bike power limit from 250W to 1000W

Relating to this other thread about aerodynamics... as you may know the world record for human powered vehicle is something like 130kmh.

1000W has the potential to get you to very high speeds, but it will be an expensive custom build since you need some very streamlined and lightweight bodywork.
by sven_nilsson
Jun 18 2014 5:29pm
Forum: E-Bike General Discussion
Topic: 3000W with >90% efficiency?
Replies: 2
Views: 594

3000W with >90% efficiency?

I just found this: http://www.uumotor.com/wp-content/uploads/2014/02/UMB3K-testing-data-72V3000W.pdf It looks interesting, and there is nothing obviously bogus about the results. However, the high efficiency occurs at very high (~1000) RPM, which makes it not very useful unless you have smaller rims...
by sven_nilsson
Jun 18 2014 5:23pm
Forum: E-Bike General Discussion
Topic: Finland increasing e-bike power limit from 250W to 1000W
Replies: 24
Views: 2661

Re: Finland increasing e-bike power limit from 250W to 1000W

I'm really happy to hear that Finland is doing something good. Maybe they realize that e-bike has the potential to solve many of the urban transport and pollution related problems? I'm guessing 90% of all people live close enough to work to use an e-bike instead of car or public transport.
by sven_nilsson
Jun 18 2014 5:14pm
Forum: E-Bike General Discussion
Topic: Planning to buy 48v 6000w
Replies: 16
Views: 1583

Re: Planning to buy 48v 6000w

Maybe it is, but you cannot compare to motorcycle chain requirements because an electric motor produces very smooth torque while a combustion engine is like a sledgehammer in comparison and will need much stronger stuff, especially the four-stroke engines.
by sven_nilsson
Jun 11 2014 5:20pm
Forum: E-Bike General Discussion
Topic: Security
Replies: 57
Views: 5447

Re: Security

Forget about the expensive locks and instead install alarms and tracking. Much more effective, trust me. Why? Even with locks, the expensive electronics, batteries and motors can still be stolen! You can have an alarm with accelerometer, text messaging and GPS tracking. When someone tampers with you...
by sven_nilsson
Jun 11 2014 5:11pm
Forum: E-Bike General Discussion
Topic: Warning: battery-matrix
Replies: 4
Views: 432

Re: Warning: battery-matrix

I provided everything they asked for during the order. After ordering all you get is a confirmation email from "Battery Home", then nothing happens. It would be okay if they just tried to send something to excuse the delays, but there was absolutely no feedback, which is utterly unacceptable. God bl...
by sven_nilsson
Jun 10 2014 2:40pm
Forum: E-Bike General Discussion
Topic: Anyone else had issues with orders from Leaf Motors/Bikes?
Replies: 15
Views: 826

Re: Anyone else had issues with orders from Leaf Motors/Bike

The motor works fine but the phase wires are way too thins. At 20A on it, the wires get hot. I can imagine more than 20-25A constant with these wires. Motor remains cool. Because it's a very fast winding, it can be very hard on controllers. I've blown 2 of my 15Fets controllers on slopes. Ouch... t...
by sven_nilsson
Jun 09 2014 11:48am
Forum: E-Bike General Discussion
Topic: Warning: battery-matrix
Replies: 4
Views: 432

Warning: battery-matrix

Hi! I just want to tell everyone to AVOID the shop http://www.battery-matrix.com based on my recent experience. They sell many electic vehicle related items. I ordered a BMS from them, paid with Paypal. After 20 days nothing had happened so I e-mailed them. The response came after 3 days and was ver...
by sven_nilsson
Jun 09 2014 11:33am
Forum: E-Bike General Discussion
Topic: Anyone else had issues with orders from Leaf Motors/Bikes?
Replies: 15
Views: 826

Re: Anyone else had issues with orders from Leaf Motors/Bike

I'm also thinking about getting one of the Leafbike motors. The claimed 90.5% efficiency is one of the reasons. However, now I'm starting to think there is something fishy about it. The reason is that just one measurement point has an efficiency above 90%, the others are well below: http://www.leafb...