The Sportster and Buell Motorcycle Forum - The XLFORUM®
 

Go Back   The Sportster and Buell Motorcycle Forum - The XLFORUM® > SPORTSTER MOTORCYCLE FORUM > Sportster Motorcycle Electrical > Sportster Motorcycle Electrical and Ignition
XLF Blogs XLF Arcade XLF Disclaimer/Privacy Statement/Terms Of Use

Active Threads
0 Poll for the legalization of cannabis
Last Post: Kbetts
Posted On: 4 Minutes Ago
Replies: 443
Views: 55,908
0 Guzzi V7
Last Post: sportsterdoc
Posted On: 9 Minutes Ago
Replies: 9
Views: 145
0 Wheel Bearing Question
Last Post: sportsterdoc
Posted On: 14 Minutes Ago
Replies: 9
Views: 338
0 This week on Craig's list
Last Post: moparnut72
Posted On: 29 Minutes Ago
Replies: 3,650
Views: 379,919
0 Official XL Forum Random Image Thread (NO NUDITY!)
Last Post: Airbozo
Posted On: 33 Minutes Ago
Replies: 42,213
Views: 6,541,222
0 Rivets for Front Fender Braces - '71 xlch
Last Post: GA_Ironhead
Posted On: 1 Hour Ago
Replies: 14
Views: 3,296
3 How long have you had your Iron Head?
Last Post: bremoit
Posted On: 1 Hour Ago
Replies: 394
Views: 45,132
0 My cold weather attire.
Last Post: LLOYD883
Posted On: 1 Hour Ago
Replies: 5
Views: 231
0 timing sympstoms
Last Post: rickthrash99
Posted On: 2 Hours Ago
Replies: 17
Views: 544
0 Who's still riding???
Last Post: Chuckthebeatertruck
Posted On: 2 Hours Ago
Replies: 120
Views: 7,855
0 Dale's Killer 40mm CV Carb
Last Post: Moon Wolf
Posted On: 2 Hours Ago
Replies: 23
Views: 1,126
0 How many have converted their 883 to 1200?
Last Post: Nibelungen
Posted On: 2 Hours Ago
Replies: 379
Views: 98,400
0 Let's See Them R's!!
Last Post: PetesPonies
Posted On: 3 Hours Ago
Replies: 1,502
Views: 550,970
6 Secret photo"s of folkies loft
Last Post: Folkie
Posted On: 5 Hours Ago
Replies: 1,472
Views: 210,011
0 Hello Everybody
Last Post: harley506d
Posted On: 5 Hours Ago
Replies: 17
Views: 186
0 Hot Chicks on Hot Bikes
Last Post: Stairman
Posted On: 5 Hours Ago
Replies: 9,398
Views: 1,471,100
3 Making my own exhaust gaskets?
Last Post: juzyHD
Posted On: 7 Hours Ago
Replies: 5
Views: 79
8 Tc88a
Last Post: Mjolnir
Posted On: 8 Hours Ago
Replies: 14
Views: 261
0 Forum member mug shots
Last Post: RAIDER0372
Posted On: 8 Hours Ago
Replies: 1,132
Views: 336,079
14 Firearms you wish you owned.
Last Post: Bama Lee XLC
Posted On: 8 Hours Ago
Replies: 538
Views: 93,409
0 Helmet poll
Last Post: Bama Lee XLC
Posted On: 9 Hours Ago
Replies: 822
Views: 149,185
0 Roads I'd like to ride.
Last Post: Stairman
Posted On: 9 Hours Ago
Replies: 803
Views: 50,716
0 Hot Rods, Rat Rods, and Customs.
Last Post: Stairman
Posted On: 9 Hours Ago
Replies: 2,864
Views: 280,307
0 Fork oil
Last Post: shanneba
Posted On: 9 Hours Ago
Replies: 2
Views: 80
0 Hottie of the day, no nudity.
Last Post: Stairman
Posted On: 9 Hours Ago
Replies: 9,151
Views: 752,260
0 XR1200 Torquehammer exhaust failure.. again.
Last Post: Davo_137
Posted On: 11 Hours Ago
Replies: 32
Views: 966
0 Crusty's Travels
Last Post: SonWon
Posted On: 11 Hours Ago
Replies: 1,759
Views: 191,287
0 Rolling Thunder Coming To An End
Last Post: iNSaNeSHaNe
Posted On: 12 Hours Ago
Replies: 4
Views: 159
0 You asked for it! "The Tess' Coffee Thread"
Last Post: sportsterpaul
Posted On: 15 Hours Ago
Replies: 10,413
Views: 747,357
0 Ignition Module failure or Intake leak?
Last Post: sportsterdoc
Posted On: 19 Hours Ago
Replies: 6
Views: 176
More...
Members Birthdays
Sponsored Links
Reply
 
Share Thread Tools Display Modes
  #71  
Old 1 Week Ago
sportsterdoc's Avatar
sportsterdoc sportsterdoc is offline
Senior Master Custom Bike Builder
 
Join Date: Apr 2012
Location: Mojave Desert
Posts: 13,031
Sportster/Buell Model: 1200S
Sportster/Buell Year: 2002
Sportster/Buell Model #2: XLH883
Sportster/Buell Year #2: 2003
Reputation: 4777439
sportsterdoc has a reputation beyond reputesportsterdoc has a reputation beyond reputesportsterdoc has a reputation beyond reputesportsterdoc has a reputation beyond reputesportsterdoc has a reputation beyond reputesportsterdoc has a reputation beyond reputesportsterdoc has a reputation beyond reputesportsterdoc has a reputation beyond reputesportsterdoc has a reputation beyond reputesportsterdoc has a reputation beyond reputesportsterdoc has a reputation beyond repute
Default

Quote:
Originally Posted by Ireeman View Post
Frankly all vehicles should go to 24 or 48 volt systems...the amps would dictate that. It's not rocket science.
Or 36 volts as used in golf carts.

However, switching DC is more of a challenge with higher voltages.

The arc extinguishing point is farther for a DC switch. Direct current is continuous voltage and a resulting arc from contact opening is constant, requiring arc extinguishing features, such as moving contacts farther apart.

AC arc interruption is simplified as the current is alternating (typically 60 times per second) and voltage goes to zero every cycle.
Reply With Quote
  #72  
Old 6 Days Ago
Kbetts's Avatar
Kbetts Kbetts is online now
Biker
 
Join Date: Oct 2018
Location: North Carolina USA
Posts: 44
Sportster/Buell Model: XL1200C
Sportster/Buell Year: 2008
Other Motorcycle Model: Suzuki DL650ADV
Other Motorcycle Year: 2012
Reputation: 206933
Kbetts has a brilliant futureKbetts has a brilliant futureKbetts has a brilliant futureKbetts has a brilliant futureKbetts has a brilliant futureKbetts has a brilliant futureKbetts has a brilliant futureKbetts has a brilliant futureKbetts has a brilliant futureKbetts has a brilliant futureKbetts has a brilliant future
Default

Most digital stuff (ECU, CAN BUS) are voltage dependent and most electrical components (starter and lights) are current dependent devices.

When a battery comes under load from a current device it induces a voltage spike and that's not good for the digital stuff. Same thing for a switch or contacts of any kind. They don't play well with digital logic circuits. If one of these components has a poor ground they can generate a floating ground which can really screw up the function a a logic circuit.

Ideally you'd have a separate battery to run/isolate your 3.3vdc or 5vdc electronics and another battery for 12vts or even 48vts if you want to run your current devices.

Sorry. Not sure if anyone care about this stuff but thought I'd throw it out there.
Reply With Quote
Sponsored Links
  #73  
Old 6 Days Ago
sportsterdoc's Avatar
sportsterdoc sportsterdoc is offline
Senior Master Custom Bike Builder
 
Join Date: Apr 2012
Location: Mojave Desert
Posts: 13,031
Sportster/Buell Model: 1200S
Sportster/Buell Year: 2002
Sportster/Buell Model #2: XLH883
Sportster/Buell Year #2: 2003
Reputation: 4777439
sportsterdoc has a reputation beyond reputesportsterdoc has a reputation beyond reputesportsterdoc has a reputation beyond reputesportsterdoc has a reputation beyond reputesportsterdoc has a reputation beyond reputesportsterdoc has a reputation beyond reputesportsterdoc has a reputation beyond reputesportsterdoc has a reputation beyond reputesportsterdoc has a reputation beyond reputesportsterdoc has a reputation beyond reputesportsterdoc has a reputation beyond repute
Default

EFI Sportsters have a 5 vdc power supply incorporated in the ECU for sensor power
Reply With Quote
  #74  
Old 6 Days Ago
Sportycus Sportycus is offline
Biker
 
Join Date: Sep 2018
Posts: 62
Sportster/Buell Model: XL1200C
Sportster/Buell Year: 2014
Reputation: 308877
Sportycus has a reputation beyond reputeSportycus has a reputation beyond reputeSportycus has a reputation beyond reputeSportycus has a reputation beyond reputeSportycus has a reputation beyond reputeSportycus has a reputation beyond reputeSportycus has a reputation beyond reputeSportycus has a reputation beyond reputeSportycus has a reputation beyond reputeSportycus has a reputation beyond reputeSportycus has a reputation beyond repute
Default

Quote:
Originally Posted by Kbetts View Post
They don't play well with digital logic circuits. If one of these components has a poor ground they can generate a floating ground which can really screw up the function a a logic circuit.
Usually this is resolved by using pull-up or pull-down resistors anyway.

Quote:
Originally Posted by Kbetts View Post
Ideally you'd have a separate battery to run/isolate your 3.3vdc or 5vdc electronics and another battery for 12vts or even 48vts if you want to run your current devices.
Most logic circuits like to use decoupling capacitors and series inductos to smooth out any brownouts or huge spikes in the supply. The regulators or DC-DC converters used to generate the 3.3V and 5V rails in modern circuits already provide much of that buffer anyway. This is where my idea of using a supercapacitor to provide the cranking current comes in.
Reply With Quote
  #75  
Old 6 Days Ago
rejeanprimeau's Avatar
rejeanprimeau rejeanprimeau is online now
XL FORUM TEAM MEMBER
 
Join Date: Jun 2011
Location: On a farm
Posts: 5,750
Sportster/Buell Model: XL77.2R
Sportster/Buell Year: 2006
Reputation: 1988147
rejeanprimeau has a reputation beyond reputerejeanprimeau has a reputation beyond reputerejeanprimeau has a reputation beyond reputerejeanprimeau has a reputation beyond reputerejeanprimeau has a reputation beyond reputerejeanprimeau has a reputation beyond reputerejeanprimeau has a reputation beyond reputerejeanprimeau has a reputation beyond reputerejeanprimeau has a reputation beyond reputerejeanprimeau has a reputation beyond reputerejeanprimeau has a reputation beyond repute
Default

Quote:
Originally Posted by Ireeman View Post
Imagine if you will...
A Sportster that starts and runs off a 24 volt system....it could be like finding fire on the Serengeti plains.
Lucas excepting
Just install another 10 pounds of battery on your bike, I use 24 volts with a constant voltage MIG welder to boost cars; the starter turn like an Asgardian flying saucer.
Reply With Quote
  #76  
Old 6 Days Ago
Kbetts's Avatar
Kbetts Kbetts is online now
Biker
 
Join Date: Oct 2018
Location: North Carolina USA
Posts: 44
Sportster/Buell Model: XL1200C
Sportster/Buell Year: 2008
Other Motorcycle Model: Suzuki DL650ADV
Other Motorcycle Year: 2012
Reputation: 206933
Kbetts has a brilliant futureKbetts has a brilliant futureKbetts has a brilliant futureKbetts has a brilliant futureKbetts has a brilliant futureKbetts has a brilliant futureKbetts has a brilliant futureKbetts has a brilliant futureKbetts has a brilliant futureKbetts has a brilliant futureKbetts has a brilliant future
Default

Quote:
Originally Posted by Sportycus View Post
Usually this is resolved by using pull-up or pull-down resistors anyway.


Most logic circuits like to use decoupling capacitors and series inductos to smooth out any brownouts or huge spikes in the supply. The regulators or DC-DC converters used to generate the 3.3V and 5V rails in modern circuits already provide much of that buffer anyway. This is where my idea of using a supercapacitor to provide the cranking current comes in.
As you say, they've designed around the problem. We'll have to see if they can make it work at 48vdc.

Based on experience, at 48vdc the neg/pos spikes are going to be steeper and stuff is going fail in far more interesting ways.


I too hope they can bring a better battery/capacitor to market soon.
Reply With Quote
  #77  
Old 4 Days Ago
Ireeman's Avatar
Ireeman Ireeman is offline
Asgardian
 
Join Date: Jul 2008
Location: Deck of Me boat
Posts: 7,761
Sportster/Buell Model: 883r
Sportster/Buell Year: 2003
Other Motorcycle Model: Watkins 27
Other Motorcycle Year: abov
Reputation: 5632095
Ireeman has a reputation beyond reputeIreeman has a reputation beyond reputeIreeman has a reputation beyond reputeIreeman has a reputation beyond reputeIreeman has a reputation beyond reputeIreeman has a reputation beyond reputeIreeman has a reputation beyond reputeIreeman has a reputation beyond reputeIreeman has a reputation beyond reputeIreeman has a reputation beyond reputeIreeman has a reputation beyond repute
Default

Again, Flow batteries. Handle bar mounted for pitch.
__________________
Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 2 (0 members and 2 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Sponsored Links
All times are GMT +1. The time now is 21:47.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
XL Forum® - Linson Media LLC