Search found 55 matches

by electric_nz
Jul 10 2020 6:35pm
Forum: Battery Technology
Topic: What kind of BMS can i use on a 52v 14s 8p battery?
Replies: 26
Views: 624

Re: What kind of BMS can i use on a 52v 14s 8p battery?

14s is 52.2V. Check your wiring diagram, should be 15 connections to the cells including negative black wire
by electric_nz
Jul 07 2020 11:35pm
Forum: Battery Technology
Topic: ni-cd to lipo
Replies: 4
Views: 160

Re: ni-cd to lipo

Needs a BMS or RC warning buzzer to ensure it won't go below low voltage cutoff of approx 2.5V per cell.

if you're talking a very small car you could use 2 protected 18650s instead of a BMS
by electric_nz
Jun 18 2020 3:57pm
Forum: Battery Technology
Topic: What BMS should I pick for 30A BBSHD motor ?
Replies: 23
Views: 505

Re: What BMS should I pick for BBSHD?

Entirely possible - you might want to email them and ask what specific model BMS is used, or just wait for it to arrive and open it up

you can limit the BBSHD to 20A in software I understand, and you can gradually try ramping up the current to see if it works.
by electric_nz
Jun 18 2020 3:20pm
Forum: Battery Technology
Topic: What BMS should I pick for 30A BBSHD motor ?
Replies: 23
Views: 505

Re: What BMS should I pick for BBSHD?

21000mAH of 3500maH Samsung cells (likely the 35E) suggests 6battery cells in each parallel group. The 35E are 8Amp Continuous current rated cells so the cells themselves should have no issues providing 30A continuous. You could ask the seller if they can upgrade to a 45A BMS which would provide mor...
by electric_nz
Jun 14 2020 2:47am
Forum: Battery Technology
Topic: 18650pack cell protection idea. PTC + fuse & diode).
Replies: 25
Views: 1459

Re: 18650pack cell protection idea. PTC + fuse & diode).

Panasonic and other cells already have a thermal fuse in them, and the datasheet has details of destructive test results (usually they test a sample by subjecting them to dead short, over charge, over temp etc) The reality is there are millions (billions?) of lithium ion cells in service all over th...
by electric_nz
May 27 2020 8:02pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Your Creation's Before & After Pics
Replies: 1895
Views: 673869

Re: Your Creation's Before & After Pics

I've been on this forum for a couple of years now and have built four ebikes. Yours is one of the most appealing I've seen on here. Love the understated look/colors but with the bad-ass motor snugly mounted and prominently displayed. Super cool dude. Thanks! I commute every day on this so want some...
by electric_nz
May 23 2020 5:07pm
Forum: Battery Technology
Topic: 14s5p samsung 30q battery charging problems
Replies: 29
Views: 569

Re: 14s5p samsung 30q battery charging problems

58v sounds like a full battery- does it work on the bike? Easiest place to test is the bms connector if you have access to it. Unplug the connector from the BMS, Clip the negative lead of the multimeter to the main battery negative Then measure one pin at a time on the BMS connector. Should be all t...
by electric_nz
May 18 2020 8:53pm
Forum: E-Bike Non-hub Motor Drives
Topic: new cyclone 3000 w mid-drive kit?
Replies: 3349
Views: 428783

Re: new cyclone 3000 w mid-drive kit?

Here is my Cyclone 3000 using the GNG brackets. no before pic but it is a "parts bike" with 26" downhill rims and Shimano parts. Frame: Brand X HT-01 (73 mm bottom bracket with the GNG bracket bolted to the ISCG mount) Battery: 14S5P Samsung INR18650-25S in a Reention case, stock Cyclone controller ...
by electric_nz
May 18 2020 8:50pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Your Creation's Before & After Pics
Replies: 1895
Views: 673869

Re: Your Creation's Before & After Pics

Here is my Cyclone 3000 using the GNG brackets. no before pic but it is a "parts bike" with 26" downhill rims and Shimano parts. Frame: Brand X HT-01 (73 mm bottom bracket with the GNG bracket bolted to the ISCG mount) Battery: 14S5P Samsung INR18650-25S in a Reention case, stock Cyclone controller ...
by electric_nz
May 18 2020 2:52am
Forum: E-Bike Non-hub Motor Drives
Topic: My Build Plan - Any Advice?
Replies: 1
Views: 162

Re: My Build Plan - Any Advice?

40mph is pretty fast for a bicycle, if you crash at that speed you’ll be very sore! Aim for 30 and you’ll actually be able to steer around potholes before you hit them. Those forks probably won’t support more than a 180mm front disk if that- the older ones twist a scary amount. Check what bottom bra...
by electric_nz
May 13 2020 4:48am
Forum: E-Bike Non-hub Motor Drives
Topic: new cyclone 3000 w mid-drive kit?
Replies: 3349
Views: 428783

Re: new cyclone 3000 w mid-drive kit?

I'm looking into upgrading my old 1680w motor to the new 3000, I was wondering if anyone knew a way to elongate the waterproof motor cable, well other than cutting and soldering in wires, like if there is an extension cable I can purchase. thanks Cyclone-tw web page has cables listed on their bldc ...
by electric_nz
May 12 2020 2:40am
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 472
Views: 49726

Re: Li-ion cells cycle ageing

Very interesting to see the internal resistance of many of these remain consistently low over the full 700 cycles. It appears this new generation of cells (vtc6, hg2) has both high power, relatively high capacity and outstanding cycle life. Assuming these formulations are the same used in factory bu...
by electric_nz
May 08 2020 10:09pm
Forum: E-Bike General Discussion
Topic: New Deore 12-speed is like XTR, or XT, or SLX, but cheaper
Replies: 4
Views: 206

Re: New Deore 12-speed is like XTR, or XT, or SLX, but cheaper

That chain line is going to be ugly unless it’s a super narrow super flexible chain not great for ebikes.

The cheapest Japanese made Shimano stuff seems to be the sweet spot for me
by electric_nz
Apr 27 2020 9:16pm
Forum: Battery Technology
Topic: Luna Charger dead after 10 uses.
Replies: 25
Views: 712

Re: Luna Charger dead after 10 uses.

I have the 52V version and have used without issue for hundreds of charge cycles. Might just be bad luck?

Happy to open mine up if you need anything compared.
by electric_nz
Apr 27 2020 6:32pm
Forum: E-Bike General Discussion
Topic: Off-The-Shelf Ebike. Worth it?
Replies: 13
Views: 605

Re: Off-The-Shelf Ebike. Worth it?

I love the idea of a super reliable commuter, DIY efforts usually come with some level of reliability issues. But you certainly pay top dollar for them. As a project, I thought it could be quite good to find a used factory ebike with dead battery and fit external controller, throttle and higher volt...
by electric_nz
Apr 23 2020 4:19pm
Forum: Battery Technology
Topic: 21700 for low P count battery
Replies: 11
Views: 621

Re: 21700 for low P count battery

you could also look at Sony/Murata VTC6A 21700 at 4000maH; they appear extremely durable, low internal resistance and low sag.
by electric_nz
Apr 18 2020 4:26am
Forum: Motor Technology
Topic: Mid-drive IPM motor options?
Replies: 42
Views: 2031

Re: Mid-drive IPM motor options?

older cyclone 1680W motor appears to be IPM

https://mrbill.homeip.net/albums/cyclon ... ndex4.html
by electric_nz
Mar 26 2020 2:11pm
Forum: Battery Technology
Topic: 90% Battery Charger
Replies: 10
Views: 485

Re: 90% Battery Charger

Luna 52V charger has 80-90-100% charge setting and 3/4/5 Amp charge. I've used one for years
by electric_nz
Mar 13 2020 1:58am
Forum: E-Bike General Discussion
Topic: Battery Disconnect method.
Replies: 59
Views: 2472

Re: Battery Disconnect method.

There are a few BMS out there with an on off switch; they use the mosfets to switch the battery current on and off, with no need of a large switch.
by electric_nz
Mar 11 2020 12:11pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Powerful e-bike commuter/runaround for hilly area
Replies: 6
Views: 833

Re: Powerful e-bike commuter/runaround for hilly area

for steep hills you definitely want a mid drive so you can use the gears to climb any hill. however it's unlikely even with 2500W you are going to hit 25mph uphill, perhaps 15-20? Overdriving it by that much is also likely to kill the motor- if you're using it for a work commuter then you need relia...
by electric_nz
Mar 10 2020 12:50pm
Forum: E-Bike Technical
Topic: Gorilla Tape on 18650 Battery Pack
Replies: 2
Views: 235

Re: Gorilla Tape on 18650 Battery Pack

It's ok but can lose its stickiness and come loose, and/or get holes worn through on sharp points due to vibration. thick PVC tape in a few layers is better.

It's completely an insulator at the low voltages in a battery pack (unless saturated with water perhaps)
by electric_nz
Mar 02 2020 3:25pm
Forum: Battery Technology
Topic: How do I choose which battery is the best for my application
Replies: 6
Views: 569

Re: How do I choose which battery is the best for my application

sounds like a dream life for any cell, at 15A draw divided by 14p you will only be drawing less than an amp per cell. if you limit the charge and discharge to 90% and 20% you should get good cycle life. suggest reading the thread on Li-ion battery aging, some of the testing suggests 1000 charge cycl...
by electric_nz
Mar 01 2020 2:01am
Forum: E-Bike Non-hub Motor Drives
Topic: new cyclone 3000 w mid-drive kit?
Replies: 3349
Views: 428783

Re: new cyclone 3000 w mid-drive kit?

Edit for clarity: I have the non Bluetooth version and I’m interested in how the default settings compare to the Bluetooth version. Anyone using the black Bluetooth 40A controller as pictured here? Are the stock settings the same as the non Bluetooth version and how does it run out of the box? http:...
by electric_nz
Feb 20 2020 11:59pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Building my first ebike - advice needed ;-)
Replies: 4
Views: 813

Re: Building my first ebike - advice needed ;-)

I have an older giant xtc2 and that thing is solid af even at high speeds. If you’re going bafang may as well go for the bbshd and get the extra power. Pretty much any cell in 5P config will handle the draw. Look at a Luna charger that will allow you to charge at 90% and control the current.chain li...