Search found 109 matches

by electric_nz
Feb 21 2021 5:26pm
Forum: EBike General Discussion
Topic: Help with an e-bike for my courier job
Replies: 20
Views: 535

Re: Help with an e-bike for my courier job

Could look at something rugged prebuilt like a juiced ODK v3. Has an option for a long range battery pack and a 500-1000W bafang front hub.
by electric_nz
Feb 06 2021 2:30am
Forum: EBike Troubleshooting
Topic: New here and have some capacitor ?s
Replies: 5
Views: 181

Re: New here and have some capacitor ?s

That corrosion looks very bad- rip out those caps and replace
by electric_nz
Jan 31 2021 2:57pm
Forum: EBike General Discussion
Topic: Durable 10 speed cassette and chain?
Replies: 21
Views: 390

Re: Durable 10 speed cassette and chain?

What’s the difference between a 10 speed derailleur and 8 speed? The shifter determines the shift distance so is it just the width of the chain guide and jockey wheels etc?
by electric_nz
Jan 27 2021 5:34pm
Forum: EBike Non-hub Motor Drives
Topic: reliable middrive for commute?
Replies: 21
Views: 854

Re: reliable middrive for commute?

For what it’s worth the cyclone kits have been rock solid for me. Not exactly subtle or elegant though and the motor mounts are the weak point of the kits.
by electric_nz
Jan 24 2021 8:56pm
Forum: EBike Technical
Topic: tips for modding KT 9-fet controller for higher volts ?
Replies: 8
Views: 256

Re: tips for modding KT 9-fet controller for higher volts ?

if it's not getting warm then by definition it can't be wasting much energy as heat. and if you're only using 60V with caps rated to 63V that is still within their rating, no point in changing them out!
by electric_nz
Jan 04 2021 4:41pm
Forum: EBike Technical
Topic: Anyone using BAFANG G062.1000 1000W geared hub motor?
Replies: 8
Views: 475

Re: Anyone using BAFANG G062.1000 1000W geared hub motor?

Only fits a fat bike tho- and then there are about 3 different dropout ‘standards’ for those. (Hub is 175mm OLD)
by electric_nz
Dec 31 2020 2:27am
Forum: General Discussion
Topic: What's up guys!
Replies: 3
Views: 295

Re: What's up guys!

electric_nz wrote:
Dec 31 2020 2:27am
Fullofhope wrote:
Dec 30 2020 9:38am
I'm simple guy from Denver.Wish you good day:)
Happy 2021 from New Zealand!
by electric_nz
Dec 31 2020 2:27am
Forum: General Discussion
Topic: What's up guys!
Replies: 3
Views: 295

Re: What's up guys!

Fullofhope wrote:
Dec 30 2020 9:38am
I'm simple guy from Denver.Wish you good day:)
Happy 2021 from New Zealand
by electric_nz
Dec 30 2020 2:14am
Forum: Battery Technology
Topic: C rating for low power 18650s
Replies: 43
Views: 1023

Re: C rating for low power 18650s

They like being warm in my experience. Performance was greatly improved once the cells were 30-40C which is probably why they have higher measured capacity. Cycle life of the A version is dependent on 2 main variables from my experience- slow charge (1A per cell charge rate or less) and a rest betwe...
by electric_nz
Dec 29 2020 7:20pm
Forum: Battery Technology
Topic: C rating for low power 18650s
Replies: 43
Views: 1023

Re: C rating for low power 18650s

Out of curiosity where did you get the cells from? Mine were from new old stock toughbook packs.
by electric_nz
Dec 29 2020 6:39pm
Forum: Battery Technology
Topic: C rating for low power 18650s
Replies: 43
Views: 1023

Re: C rating for low power 18650s

Spec sheet has a 3C curve rating published so presumably its tested for that rate.
by electric_nz
Dec 29 2020 5:26pm
Forum: Battery Technology
Topic: C rating for low power 18650s
Replies: 43
Views: 1023

Re: C rating for low power 18650s

Ran some new ncr18650a a while back 14s 5p pulling 1500W with occasional 50A peaks - it sagged a few volts but only ever got slightly warm even at 3C. Measured the capacity and internal resistance after 100 odd cycles and only a few percent capacity loss and no change in IR. Really good cells in my ...
by electric_nz
Dec 17 2020 2:40pm
Forum: Battery Technology
Topic: best value cell size and more
Replies: 58
Views: 1759

Re: best value cell size and more

You could but the 21700 is 21 mm in diameter as opposed to 18mm like an 18650. So it won’t fit in your bike. What’s wrong with the current pack- looks like it should do 60A peak or so? Also the usual disclaimer that There’s serious danger of fire/ explosion if you short out multiple parallel high po...
by electric_nz
Dec 14 2020 5:00pm
Forum: Battery Technology
Topic: Can you see anything wrong with this pack build?
Replies: 21
Views: 950

Re: Can you see anything wrong with this pack build?

If you’re only using 3P for around 50A load they are going to be getting pretty warm. I would use a metal case rather than plywood (with appropriate insulation of course.) also wrap a layer of thick pvc insulation tape around each cell to give it some shock protection against a short circuit to the ...
by electric_nz
Dec 14 2020 2:40am
Forum: EBike Technical
Topic: Bafang M620 new build.
Replies: 3
Views: 285

Re: Bafang M620 new build.

14s 4p is 56 cells- you need another 8. 5 parallel will give you more range and a bit more pep due to less sag, but if you’ve already bought them then don’t worry. For a data point the older version of the NCR cells was incredibly reliable for me and handled 10A peaks with no issues. 100s of cycles ...
by electric_nz
Dec 14 2020 2:33am
Forum: EBike Technical
Topic: Motor magnets
Replies: 5
Views: 186

Re: Motor magnets

Looks like a cyclone 3000? Someone might have a burned up one they can extract a magnet from for you?
by electric_nz
Dec 11 2020 2:35am
Forum: Battery Technology
Topic: best value cell size and more
Replies: 58
Views: 1759

Re: best value cell size and more

Could look at vtc6a 21700
by electric_nz
Dec 09 2020 3:18pm
Forum: EBike Technical
Topic: 3000W Sensorless Controller
Replies: 21
Views: 790

Re: 3000W Sensorless Controller

Is the throttle response good? Many cheap controllers have nothing happening for half a second then full power. I’m trying to find a cheap controller that has instant throttle response but not much luck so far?
by electric_nz
Dec 08 2020 7:22pm
Forum: EBike Non-hub Motor Drives
Topic: new cyclone 3000 w mid-drive kit?
Replies: 3471
Views: 458774

Re: new cyclone 3000 w mid-drive kit?

Looks like cyclone is selling a 330mm disc with 6 bolt brake mounting and bcd chainring holes. It’s 3mm thick though which means it won’t work with bicycle calipers I would think? https://www.cyclone-tw.com/product/14/data/73 Looks like they also do a plain adapter too- https://www.cyclone-tw.com/pr...
by electric_nz
Dec 07 2020 1:31am
Forum: EBike Technical
Topic: Hub motor direct from Chinese supplier
Replies: 14
Views: 516

Re: Hub motor direct from Chinese supplier

BMSbattery has been a good supplier to me so far; shipping is screwed because of COVID tho. :edit: all arrived safely! Recommended
by electric_nz
Dec 07 2020 1:26am
Forum: General Discussion
Topic: Unit Pack Power - Safe Battery?
Replies: 5
Views: 435

Re: Unit Pack Power - Safe Battery?

Should be fine. That YouTube guy was running 2 packs in parallel with a sketchy circuit which probably caused the issue. The main thing with Chinese cells is cycle life- they aren’t quite as good. If you’re really concerned then just don’t leave it charging unattended and always turn off the charger...
by electric_nz
Dec 06 2020 9:01pm
Forum: EBike Build Threads
Topic: 1st build / and 1st post / Grin build
Replies: 28
Views: 1358

Re: 1st build / and 1st post / Grin build

With some effort, I would suggest using Bafang FAT motor machined to fit 135mm dropout like I did. You will save money on motor purchase and gain a way more torque with slight motor weight increase compered to GMAC. My modified Bafang FAT running at 78V battery is holding 3,5KW peaks no problem. To...
by electric_nz
Dec 05 2020 2:18am
Forum: Battery Technology
Topic: 21700 battery pack construction advice please
Replies: 4
Views: 454

Re: 21700 battery pack construction advice please

Assume you mean Nickel strips! They have ratings posted for continuous current.

So are the 4 packs going to be connected in series parallel? Creating a large 26series/10parallel pack?
by electric_nz
Nov 30 2020 5:47am
Forum: Items for Sale - New
Topic: QSMOTOR,0.5-12kW Electric Hub Motor & Mid Drive Motor Manufacture China
Replies: 1407
Views: 301527

Re: QSMOTOR,0.5-12kW Electric Hub Motor & Mid Drive Motor Manufacture China

Are there any other 135mm hubs or only the 212 v1.12? Anyone used this hub successfully with a 26” wheel?
by electric_nz
Nov 23 2020 11:21am
Forum: Items Wanted
Topic: Wanted- Old cyclone 650-1680W rotor only
Replies: 0
Views: 195

Wanted- Old cyclone 650-1680W rotor only

I think I have demagnetised my old cyclone 650-1680 as it’s far less powerful than it used to be and just wanted to try replacing the rotor before giving up. Location is New Zealand, will pay postage if not too crazy.