Search found 1865 matches

by hillzofvalp
Oct 27 2014 2:39pm
Forum: Battery Technology
Topic: Nissan Leaf Cells Test Data
Replies: 383
Views: 80449

Re: Nissan Leaf Cells Test Data

agniusm, please upload more pictures of the pack up close from all different angles. I'm quite curious. If you can make an estimation on how many 18650s you could practically fit in there (safely), that'd be great too. I have a leaf.. when the pack gets down to 70% and I do not make the warranty, I'...
by hillzofvalp
Oct 16 2014 12:44am
Forum: Stand-up E-scooters and E-skateboards
Topic: |Pen E-Board| Smallest E-board ever|Friction Drive|
Replies: 126
Views: 18494

Re: Need HELP |Pen E-Board| Smallest E-board ever|

Looks fast. How much have you ridden it? Any issues?
by hillzofvalp
Oct 09 2014 6:34pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Kickr - west coast meetup 12/24 - 1/02
Replies: 41
Views: 7709

Re: Kickr - west coast meetup 12/24 - 1/02

you should look at the power rating charts from rc outrunner manufacturers. The rating decreases with a decrease in kv for the same motor stator (due to ir^2 heating from smaller phase wires and longer winding length). If you are operating a low kv motor and 100% duty cycle most of the time and not ...
by hillzofvalp
Oct 09 2014 10:38am
Forum: Stand-up E-scooters and E-skateboards
Topic: Kickr - west coast meetup 12/24 - 1/02
Replies: 41
Views: 7709

Re: Kickr - west coast meetup 12/24 - 1/02

There isn't exactly one way to do it. Thermal mass is the biggest problem with these small rc motors.. if you can reduce heating, you're golden. There is more to be gained increasing the size of the phase wire (fewer turn/ higher kv) and lowering your pack voltage than doing the opposite and increas...
by hillzofvalp
Oct 09 2014 12:58am
Forum: Stand-up E-scooters and E-skateboards
Topic: |Pen E-Board| Smallest E-board ever|Friction Drive|
Replies: 126
Views: 18494

Re: Need HELP |Pen E-Board| Smallest E-board ever|

Low kv is good to a point. Smaller the phase cross section, the more ir^2 losses you get, heating up a tiny motor.

We use a certain "grip tape" mostly.. it's not on the motor pictured.
by hillzofvalp
Oct 08 2014 9:13pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Kickr - west coast meetup 12/24 - 1/02
Replies: 41
Views: 7709

Re: Kickr - west coast meetup 12/24 - 1/02

Hi. Awesome design. I might have missed it: does it have brakes? Do u know the motor size and kv? Wondering how have so little gearing compared to the typical 3:1 or 2:1 geared board with an outrunner I can't get into specifics on the motor, other than it is non-standard and developed for our produ...
by hillzofvalp
Oct 08 2014 9:12pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Kickr - west coast meetup 12/24 - 1/02
Replies: 41
Views: 7709

Re: Kickr - west coast meetup 12/24 - 1/02

You can take the brake/no-brake discussion many ways, but, in the end, you probably shouldn't be riding a skateboard if you can't slow down or avoid a catastrophe by conventional methods. Motor assist simply decreases the time it takes to attain 20mph... but then you're coasting like you normally wo...
by hillzofvalp
Oct 08 2014 8:55pm
Forum: Stand-up E-scooters and E-skateboards
Topic: |Pen E-Board| Smallest E-board ever|Friction Drive|
Replies: 126
Views: 18494

Re: Need HELP |Pen E-Board| Smallest E-board ever|

Kickr motor weighs about a pound. Not exactly a small motor cause it's so long. It's 1.5-2x more powerful than a 5065. IMG_6318.JPG Kickr on a penny board is possible, but basically suicide. If you are going to use the 5065, I would go for a higher strand count (lower turns/higher kv). The 5050/5060...
by hillzofvalp
Sep 01 2014 1:23pm
Forum: Battery Technology
Topic: Nissan Leaf Cells Test Data
Replies: 383
Views: 80449

Re: Nissan Leaf Cells Test Data

My leaf is sitting at about 55Ah after about 240 QC and 700 normal charge sessions. I'm told it's about 83% SOH (Leaf spy pro app). 23000 miles. Another leaf owner from same area is at 37000 miles and has only lost a bar just like me. I don't know what SOH you are at when you hit 10/12 bars, but ima...
by hillzofvalp
Aug 04 2014 12:32am
Forum: Items for Sale - New
Topic: Hubmonster 94% efficient 7kw NO LONGER FOR SALE
Replies: 454
Views: 75026

Re: Hubmonster 94% efficient 7kw rated $539 introductory pri

I can make you traction control software!!!! HOw much?!!
by hillzofvalp
Jul 30 2014 8:49pm
Forum: Battery Technology
Topic: A123 20AHr Pouch Cell Battery Build & Info Thread
Replies: 985
Views: 143630

Re: A123 20AHr Pouch Cell Battery Build & Info Thread

Am I allowed to advertise "for sale" A123 builds here?
by hillzofvalp
Jul 22 2014 10:55pm
Forum: Battery Technology
Topic: Nissan Leaf Cells Test Data
Replies: 383
Views: 80449

Re: Nissan Leaf Cells Test Data

They have a yearly check on your battery which is basically just a print-out star system rating your charge behavior. This is a pre-owned car and it had 4 stars for fast charge, but all other categories (trickle, standard, short cycles) were 5 stars. They actually encourage you to standard charge mo...
by hillzofvalp
Jul 21 2014 11:40pm
Forum: Battery Technology
Topic: Nissan Leaf Cells Test Data
Replies: 383
Views: 80449

Re: Nissan Leaf Cells Test Data

I just got a leaf, and I'm trying to figure out the economics of their 60,000 mile battery warranty (if pack goes below 70%, they will replace). Strangely, 60,000/65 (avg trip of 65) yields ~1000 cycles. Looking at other nmc like sony vtc4, if you project the cycle life data for ~4C you get 70% capa...
by hillzofvalp
Jun 30 2014 5:29pm
Forum: Items for Sale - New
Topic: Hubmonster 94% efficient 7kw NO LONGER FOR SALE
Replies: 454
Views: 75026

Re: Hubmonster 94% efficient 7kw rated $539 introductory pri

electronics guy? like me :)? let me know! It looks alright now but would look more futuristic and better matched with the discs I speak of. I've had a lot of mixed reaction.. but definitely negative when I had the smaller tire. The kellys aren't behaving right ever since I replaced them. I think the...
by hillzofvalp
Jun 30 2014 11:24am
Forum: Items for Sale - New
Topic: Hubmonster 94% efficient 7kw NO LONGER FOR SALE
Replies: 454
Views: 75026

Re: Hubmonster 94% efficient 7kw rated $539 introductory pri

It can mask the smaller rear wheel because you can make it 17" in diameter and float just above the tire out where it transitions from tread to sidewall. (not actually touch tire but close).
by hillzofvalp
Jun 30 2014 1:02am
Forum: Stand-up E-scooters and E-skateboards
Topic: friction drive for skatecycle
Replies: 7
Views: 1553

Re: friction drive for skatecycle

https://www.kickstarter.com/projects/424686603/kickr-electrify-every-longboard looks like they made it... the problem might end up being kv&torque.. a 192 KV with 64 mm diameter on 6s will theretically do about 55 kph but with comparatively a very low torque... so you need to fins some small diamet...
by hillzofvalp
Jun 30 2014 12:26am
Forum: Items for Sale - New
Topic: Hubmonster 94% efficient 7kw NO LONGER FOR SALE
Replies: 454
Views: 75026

Re: Hubmonster 94% efficient 7kw rated $539 introductory pri

What about just using some abs or thin polycarbonate and cutting it in a disc but with a slit across it so you can shape it like a cone? or would it be better if it was flat? I'd like to make it float above the tire so that the tire can still move freely if you know what I mean. Attach it off of the...
by hillzofvalp
Jun 29 2014 8:11pm
Forum: Items for Sale - New
Topic: Hubmonster 94% efficient 7kw NO LONGER FOR SALE
Replies: 454
Views: 75026

Re: Hubmonster 94% efficient 7kw rated $539 introductory pri

Cool.

What do you think about wheel covers, front and rear, kinda like race bicycles but not covering the air vents on the motor? I think it would also make my bike look better since it could cover up the rim size mismatch
by hillzofvalp
Jun 28 2014 7:32pm
Forum: Items for Sale - New
Topic: Hubmonster 94% efficient 7kw NO LONGER FOR SALE
Replies: 454
Views: 75026

Re: Hubmonster 94% efficient 7kw rated $539 introductory pri

John, what would you say your average efficiency is now after x miles? In this hot weather I'm going to tone it way down and see if I can do 50Wh/mile at 45mph. I think I usually do around 60-70Wh/mile cruising at that speed. This may be contradictory though because gains are probably really small b...
by hillzofvalp
Jun 13 2014 12:29am
Forum: Battery Technology
Topic: Nissan Leaf Cells Test Data
Replies: 383
Views: 80449

Re: Nissan Leaf Cells Test Data

I live pretty close to the Smyrna battery plant.. But it's very difficult to get through to the people who are in charge of the b grade cells ;)