Search found 152 matches

by soyachips
38 minutes ago
Forum: Members Machines
Topic: Soyachips’ Electric FZR250
Replies: 50
Views: 2015

Re: Soyachips’ Electric FZR250

Richo wrote:
Today, 12:33
4 x headway is 12.8V nominal and 14.6V charged.
So anything from 13V-14V is ok.
Most of that would be for the headlight+brake light.

So 100-150W for a DC-DC?
Thanks, I was wondering what sort of power I should get.

Any ideas where to get a reasonably priced isolated DC-DC converter?
by soyachips
54 minutes ago
Forum: Members Machines
Topic: Soyachips’ Electric FZR250
Replies: 50
Views: 2015

Re: Soyachips’ Electric FZR250

brendon_m wrote:
Yesterday, 22:46
Most dcdc converters I've seen that say they output 12v actually output around 14v. I think they just use 12v because that's the voltage that people know.
Check the datasheet/in depth specs to be sure
Great thanks, will do 👍
by soyachips
Yesterday, 21:45
Forum: Members Machines
Topic: Soyachips’ Electric FZR250
Replies: 50
Views: 2015

Re: Soyachips’ Electric FZR250

OK so I think I know the answer but just want to check so I don’t buy the wrong thing ... if I use 4 x LiFePO4 cells to power my 12V system and I want to use a DC-DC converter to keep them charged, I need a converter that outputs something higher than 12V right? I’ve seen ones that output 13.8V whic...
by soyachips
Thu, 10 Oct 2019, 14:25
Forum: Batteries, charging, management and monitoring
Topic: Template letter for a business or commune to install a charging station. Anyone?
Replies: 7
Views: 236

Re: Template letter for a business or commune to install a charging station. Anyone?

Thanks @Bryce good to see there are other people lobbying their local councils to try and find solutions!
by soyachips
Sun, 06 Oct 2019, 14:11
Forum: Members Machines
Topic: Soyachips’ Electric FZR250
Replies: 50
Views: 2015

Re: Soyachips’ Electric FZR250

francisco.shi wrote:
Sat, 05 Oct 2019, 17:55
I much does the battery pack weigh?
The pack weighs 28.5kg
by soyachips
Sun, 06 Oct 2019, 14:07
Forum: Members Machines
Topic: Brendon_m Moke
Replies: 141
Views: 10068

Re: Brendon_m Moke

Nice work, that should make it much stronger. Reminds me of some of the organic designs that Autodesk’s generative design algorithms produce. Crazy stuff!
by soyachips
Fri, 04 Oct 2019, 21:37
Forum: Batteries, charging, management and monitoring
Topic: Template letter for a business or commune to install a charging station. Anyone?
Replies: 7
Views: 236

Re: Template letter for a business or commune to install a charging station. Anyone?

Hi everyone, is there any material you can share on this as I'm in the same boat trying to find a solution to charging near home as I only have street parking. Trying to get something installed at work as well. I started approaching local businesses to see if they'd be interested in installing charg...
by soyachips
Fri, 04 Oct 2019, 21:31
Forum: Members Machines
Topic: Rolf's 1959 Puch SR150 scooter
Replies: 21
Views: 622

Re: Rolf's 1959 Puch SR150 scooter

Loving this conversion ... have you received the Headways yet? Out of interest, where did you get them from? I may need to get some replacement/spares
by soyachips
Fri, 04 Oct 2019, 21:28
Forum: Members Machines
Topic: Rolf's 1959 Puch SR150 scooter
Replies: 21
Views: 622

Re: 1959 Puch SR150 scooter

OK so it's a bit late so my brain's not working but I was having trouble reading this:
Richo wrote:
Mon, 08 Jul 2019, 12:38
Oh Jeez people listen to me :oops:
I thought it was "Oh Jeez people ... listen to me!" hahahaha
by soyachips
Fri, 04 Oct 2019, 21:15
Forum: Members Machines
Topic: Soyachips’ Electric FZR250
Replies: 50
Views: 2015

Re: Soyachips’ Electric FZR250

https://www.aliexpress.com/item/30pcs-20000-Cycles-2-3v-30ah-35ah-40ah-66160-LTO-2-4v-Lithium-Titanium-Oxide-Battery/32979869826.html The link I provided indicated 6C/15C by the seller. So the data soyachips used was based on that. I understand that this is your experience but is there any actual t...
by soyachips
Fri, 04 Oct 2019, 21:09
Forum: Members Machines
Topic: Soyachips’ Electric FZR250
Replies: 50
Views: 2015

Re: Soyachips’ Electric FZR250

Or do you mean the square corner things? They seem pretty strong too and I've got long screws going into the ends of the extrusions. Funny because I've since read that any more than 6 threads doesn't add any more strength so I did a whole lot more tapping than I needed to!
by soyachips
Fri, 04 Oct 2019, 21:04
Forum: Members Machines
Topic: Soyachips’ Electric FZR250
Replies: 50
Views: 2015

Re: Soyachips’ Electric FZR250

I love the battery pack enclosure edges - very nice. I presume they're pretty strong? Nice work on the brake caliper too - the rear brake and wheel alignment can take ages to get right. I found some references on how to make the corners strong and was going to follow that but because I'm using poly...
by soyachips
Fri, 04 Oct 2019, 21:00
Forum: Members Machines
Topic: Soyachips’ Electric FZR250
Replies: 50
Views: 2015

Re: Soyachips’ Electric FZR250

This was the final design:

3d-bracket-3.png
3d-bracket-3.png (171.35 KiB) Viewed 136 times
3d-bracket.png
3d-bracket.png (141.03 KiB) Viewed 136 times
3d-bracket-2.png
3d-bracket-2.png (108.28 KiB) Viewed 136 times
by soyachips
Fri, 04 Oct 2019, 20:55
Forum: Members Machines
Topic: Soyachips’ Electric FZR250
Replies: 50
Views: 2015

Re: Soyachips’ Electric FZR250

The other major update is on the rear brake caliper. Early on I did a lot of research to find a donor bike that I could reuse the original rear brake setup with the new hub motor. Doing lots of prototyping to make sure make sure if would all line up and fit ... so everything was going really well un...
by soyachips
Fri, 04 Oct 2019, 20:23
Forum: Members Machines
Topic: Soyachips’ Electric FZR250
Replies: 50
Views: 2015

Re: Soyachips’ Electric FZR250

OK so it's been way too long again! Quite a lot has happened but not nearly as much as I would have liked :) I decided to build the battery box using V-slot aluminium extrusion which is used on 3D printers as this would allow me to play around and adjust the size of the box easily with basic tools a...
by soyachips
Tue, 25 Jun 2019, 18:31
Forum: Batteries, charging, management and monitoring
Topic: Battery interconnect sizing
Replies: 48
Views: 1377

Re: Battery interconnect sizing

OK some things I’ve learnt while waiting for parts to arrive ... aluminium is 61% as conductive as copper but that’s pure aluminium which is quite soft so it’s alloyed with other elements to make it stronger. Most common aluminium is only around 50% as conductive as copper so as jonescg said at the ...
by soyachips
Fri, 21 Jun 2019, 20:28
Forum: Members Machines
Topic: Michael's Lotus Elise
Replies: 6
Views: 494

Re: Michael's Lotus Elise

Super exciting project. Can’t wait to see how it all works out. Out of interest where did you get the Leaf modules from? I wouldn’t mind using them in my project
by soyachips
Wed, 19 Jun 2019, 20:11
Forum: Batteries, charging, management and monitoring
Topic: Battery interconnect sizing
Replies: 48
Views: 1377

Re: Battery interconnect sizing

Thanks for all the suggestions everyone. jonescg I had no idea you could get copper cut so cheap. That's like 1/2 the price I could find on eBay just for the material! Who's your supplier? I actually jumped the gun the other night after deciding to go with aluminium and bought some spacers from here...
by soyachips
Mon, 17 Jun 2019, 19:06
Forum: Batteries, charging, management and monitoring
Topic: Battery interconnect sizing
Replies: 48
Views: 1377

Re: Battery interconnect sizing

brendon_m wrote:
Mon, 17 Jun 2019, 18:17
A lot of the cells are in parallel so each cell only sees a small portion of the current.
Each of your cells will see 1/2 the total current but from 1 pair of cells to next will be the whole kabootle
Got it, thanks for clarifying!
by soyachips
Mon, 17 Jun 2019, 19:06
Forum: Batteries, charging, management and monitoring
Topic: Battery interconnect sizing
Replies: 48
Views: 1377

Re: Battery interconnect sizing

Richo wrote:
Mon, 17 Jun 2019, 13:25
Stuff the bending - I'd go with M4 Metal spacers NPB F-F and just bolt the different height busbars together.

What's the height difference?
The height difference is 15mm but there is up to 2mm variation so keeping the bars flat would handle the variations better and be a lot less work!
by soyachips
Mon, 17 Jun 2019, 18:15
Forum: Batteries, charging, management and monitoring
Topic: Battery interconnect sizing
Replies: 48
Views: 1377

Re: Battery interconnect sizing

Dan007a wrote:
Mon, 17 Jun 2019, 17:06
Have 25mmx4mm ali.
Fyi. Make sure your nuts are tight. Ali gets very very hot if loose.
Thanks that’s a very good tip! I guess that happens with all materials though right?
by soyachips
Mon, 17 Jun 2019, 18:14
Forum: Batteries, charging, management and monitoring
Topic: Battery interconnect sizing
Replies: 48
Views: 1377

Re: Battery interconnect sizing

Regarding full current going through the interconnects, I keep thinking about those battery packs made up of lots of 18650 laptop cells and wondering how they get away with using small/thin tabs between the cells? What am I missing?
by soyachips
Mon, 17 Jun 2019, 06:45
Forum: Batteries, charging, management and monitoring
Topic: Battery interconnect sizing
Replies: 48
Views: 1377

Re: Battery interconnect sizing

brendon_m wrote:
Sat, 15 Jun 2019, 07:23
But it will be harder to bend because it'll be thicker
I’m going to try using 25mm x 3mm thick aluminium bar and just bought one of these vice brakes to do the bending. Will post the results here.

https://www.machineryhouse.com.au/V050
by soyachips
Mon, 17 Jun 2019, 06:40
Forum: Batteries, charging, management and monitoring
Topic: Battery interconnect sizing
Replies: 48
Views: 1377

Re: Battery interconnect sizing

Use some noalox to stop the aluminium from corroding at the connections. Thanks I’ve seen a lot of people using this. I’ve also seen people using Chemtools R006 which is a conductive carbon grease. Any thoughts on the pros and cons of both? Shame you couldn’t use the plates you had made up! What wa...
by soyachips
Mon, 17 Jun 2019, 06:30
Forum: Batteries, charging, management and monitoring
Topic: Battery interconnect sizing
Replies: 48
Views: 1377

Re: Battery interconnect sizing

Adverse Effects wrote:
Sat, 15 Jun 2019, 07:27
would this type of connector be better?
Thanks I may end up using something like this if I can’t get solid bars to work.