Search found 31 matches

by BigBlock
Sep 09 2021 12:49pm
Forum: Stand-up EScooter/ESkateboards
Topic: EXTREMO - Scratch built 7kW billet frame scooter
Replies: 34
Views: 1702

Re: EXTREMO - Scratch built 7kW billet frame scooter

bearings pressed in place - the 30mm tapered bearing on the headtube feels stronger than many offroad bikes....

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by BigBlock
Sep 09 2021 12:40pm
Forum: Stand-up EScooter/ESkateboards
Topic: EXTREMO - Scratch built 7kW billet frame scooter
Replies: 34
Views: 1702

Re: EXTREMO - Scratch built 7kW billet frame scooter

just completed the final batch of machined parts... now the fun begins :D

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by BigBlock
Aug 30 2021 9:12am
Forum: Stand-up EScooter/ESkateboards
Topic: EXTREMO - Scratch built 7kW billet frame scooter
Replies: 34
Views: 1702

Re: EXTREMO - Scratch built 7kW billet frame scooter

I completled the assembly of the 72V battery pack - I preferred to keep the BMS outside of the vinyl wrap for easier maintanance.

the wiring management will be quite weird - still need to place the fuses and discharge resistors.

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by BigBlock
Aug 29 2021 5:37am
Forum: Stand-up EScooter/ESkateboards
Topic: EXTREMO - Scratch built 7kW billet frame scooter
Replies: 34
Views: 1702

Re: EXTREMO - Scratch built 7kW billet frame scooter

StevieB-FPV wrote:
Aug 24 2021 10:33pm
Care to share the 3D model file for the Fardriver controllers? please? :D
I modelled it very quikly for the fit check - it's accurate only in the dimensions that I needed

you can find the complete 2D drawing here: https://it.aliexpress.com/item/1005002326261717.html
by BigBlock
Aug 01 2021 5:07am
Forum: Stand-up EScooter/ESkateboards
Topic: EXTREMO - Scratch built 7kW billet frame scooter
Replies: 34
Views: 1702

Re: EXTREMO - Scratch built 7kW billet frame scooter

getting closer with the 20S battery pack. I've tried for first time the copper + nickel sandwitch and it seems to work quite well. I used 0,2mm copper bus bar with 0,15mm pure nickel strip on top - Kweld @ 65J. The welds look a little bit burnt but they have a very good mechanical bond with the cell...
by BigBlock
Jul 30 2021 1:28pm
Forum: Stand-up EScooter/ESkateboards
Topic: EXTREMO - Scratch built 7kW billet frame scooter
Replies: 34
Views: 1702

Re: EXTREMO - Scratch built 7kW billet frame scooter

quick preview of the ongoing assembly

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by BigBlock
Jul 20 2021 12:36pm
Forum: Stand-up EScooter/ESkateboards
Topic: EXTREMO - Scratch built 7kW billet frame scooter
Replies: 34
Views: 1702

Re: EXTREMO - Scratch built 7kW billet frame scooter

Just a quick update: I've completed the machining of the first batch of parts. A lot of work.... Always excited to see parts designed from scratch coming to life :D I personally like the rough machine finish, so I think I will keep as is https://i.ibb.co/BtcJCBf/2021-07-17-20-03-47.jpg https://i.ibb...
by BigBlock
Jun 25 2021 7:49am
Forum: EScooter/EMotorcycle Build Threads
Topic: Piaggio 50 scooter electric plug&play conversion
Replies: 8
Views: 706

Re: Piaggio 50 moped electric plug&play conversion

jhoexp wrote:
Jun 24 2021 3:58pm
Hei there, fellow italian electric scooter lover! :wink:
it looks we are at least three fellow here... :P
by BigBlock
Jun 23 2021 10:15am
Forum: EScooter/EMotorcycle Build Threads
Topic: Piaggio 50 scooter electric plug&play conversion
Replies: 8
Views: 706

Re: Piaggio 50 moped electric plug&play conversion

Ciao, it looks very well designed. What CAD software do you use ? I guess the target Moped would be the "Piaggio SI" or "Ciao" - If so they have very skynny frame thus you could straggle to find the room to hide the battery pack. Is the motor 48V ? To reach 5Kw you will need more...
by BigBlock
Jun 22 2021 6:44am
Forum: Items for Sale - Used
Topic: YASA P400 motor + inverter
Replies: 0
Views: 256

YASA P400 motor + inverter

Hello, I have a brand new YASA P400 + Rinehart PM100DX-SP Inverter (400V/350A) Purchased both in 2019 as spare parts for an EV Prototype but never used so far. Still in original crates. Spent Euro 15k for both - Available to negotiate the price - Please contact me only if seriously interested. https...
by BigBlock
Jun 21 2021 10:44am
Forum: Stand-up EScooter/ESkateboards
Topic: EXTREMO - Scratch built 7kW billet frame scooter
Replies: 34
Views: 1702

Re: EXTREMO - Scratch built 7kW billet frame scooter

what you mean b- b+ on same side ? They are the first e last rows of 12 cells.

The controllers are Fardriver rated at 150A max and 400A phase current. They are 18 Fets controller. I've not tried yet but they seems very well engineered.

https://www.aliexpress.com/item/1005002326822446.html
by BigBlock
Jun 17 2021 2:32pm
Forum: EScooters/EMotorcycles
Topic: Battery wiring for 100a trouble..
Replies: 7
Views: 403

Re: Battery wiring for 100a trouble..

they are laser welded. The laser welders are not affordable for DIY
by BigBlock
Jun 17 2021 10:31am
Forum: Stand-up EScooter/ESkateboards
Topic: EXTREMO - Scratch built 7kW billet frame scooter
Replies: 34
Views: 1702

Re: EXTREMO - Scratch built 7kW billet frame scooter

I finally managed to fit a 20s12p that will give ideal balance between performance and capacity. Using Samsung 30Q I will end up with a 36Ah pack and 150A BMS Going with traditional layout will allow to spread the series connection by all 12 cells (150/12 = 12,5A) that should be managed with easier ...
by BigBlock
Jun 17 2021 7:50am
Forum: EScooters/EMotorcycles
Topic: Battery wiring for 100a trouble..
Replies: 7
Views: 403

Re: Battery wiring for 100a trouble..

I have similar need and I will try to build something like this:

copper for series and nickel for parallel

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by BigBlock
Jun 17 2021 7:34am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 543
Views: 93491

Re: Spot Welding Copper Strips to 18650 Battery Cells

dont' know if it has been discussed yet, but I found an interesting system that looks to avoid soldering the copper bus bar on the cell https://ae01.alicdn.com/kf/HTB1jfaBb22H8KJjy1zkq6xr7pXag.jpg?size=242097&height=800&width=800&hash=e2bcc2f3510d7a32cedfad8351918ae9 Where did you find ...
by BigBlock
Jun 14 2021 12:12pm
Forum: Battery Technology
Topic: Series connections
Replies: 3
Views: 246

Re: Series connnections

I did some home work.

I will use a 150A BMS and it means that the 3 series bridges will reach 50A each. Definitelly too much for a single 0.1mm Nickel strip.

I'm now looking to Copper+Nickel
by BigBlock
Jun 14 2021 10:57am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 543
Views: 93491

Re: Spot Welding Copper Strips to 18650 Battery Cells

dont' know if it has been discussed yet, but I found an interesting system that looks to avoid soldering the copper bus bar on the cell

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by BigBlock
Jun 14 2021 7:15am
Forum: Stand-up EScooter/ESkateboards
Topic: New Razor EcoSmart SUP, upgrade recommendations?
Replies: 2
Views: 293

Re: New Razor EcoSmart SUP, upgrade recommendations?

it all depends from how many Amps you are able to put on your motor. Are you sure it can run @ 60V ?
by BigBlock
Jun 14 2021 4:15am
Forum: Battery Technology
Topic: Series connections
Replies: 3
Views: 246

Series connections

Hi, I'm designing a 20s9p pack that cannot be shaped in the ideal 20x9 cell rows for space contraints. The layout I'm gonna use is based on a 3x3 parallel box to be connected in 20x series. Anyone have done this before ? The drawback I see is that the series connetions will be on the last 3 cells on...
by BigBlock
Jun 13 2021 5:06am
Forum: Stand-up EScooter/ESkateboards
Topic: EXTREMO - Scratch built 7kW billet frame scooter
Replies: 34
Views: 1702

Re: EXTREMO - Scratch built 7kW billet frame scooter

Whatever extra room you may have in the battery compartment might be better used to extend range, but...the choice is yours. Fun project, though... I agree. But you have also to consider that such scooter is a fun machine not intended for very long range. I prefer to save weight too. Using the Moli...
by BigBlock
Jun 12 2021 6:21am
Forum: Stand-up EScooter/ESkateboards
Topic: EXTREMO - Scratch built 7kW billet frame scooter
Replies: 34
Views: 1702

Re: EXTREMO - Scratch built 7kW billet frame scooter

I'm struggling to find the right space to fit the battery pack - It looks the best I can do with 18650 is 20s9p...

I would like to reach at least 120A per motor (peak) - Looking at Molicel P28A or Samsung 25S

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by BigBlock
Jun 10 2021 7:16am
Forum: Stand-up EScooter/ESkateboards
Topic: EXTREMO - Scratch built 7kW billet frame scooter
Replies: 34
Views: 1702

Re: EXTREMO - Scratch built 7kW billet frame scooter

I 'm also working to a different steering tube design - the classic straight tube looks cheep and not in line with the overall style

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by BigBlock
Jun 10 2021 6:23am
Forum: Stand-up EScooter/ESkateboards
Topic: EXTREMO - Scratch built 7kW billet frame scooter
Replies: 34
Views: 1702

Re: EXTREMO - Scratch built 7kW billet frame scooter

I'm using this one just because I found quite cheep in a local bike store:

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by BigBlock
Jun 09 2021 3:25am
Forum: Motor Technology
Topic: SiAECOSYS 72V Controllers
Replies: 4
Views: 210

Re: SiAECOSYS 72V Controllers

found it. thanks
by BigBlock
Jun 08 2021 8:42am
Forum: Motor Technology
Topic: SiAECOSYS 72V Controllers
Replies: 4
Views: 210

SiAECOSYS 72V Controllers

Hi,

anyone have feedback on the SiAECOSYS Controllers ?

Try to understand the difference when compared to the Sabvoton models

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