Register free!


Reply
 
Thread Tools   Display Modes
  #1  
Old 02-18-2011, 09:07 PM
steveparrott steveparrott is offline
Sponsor
 
Join Date: Jun 2005
Location: Tampa, FL
Posts: 988
New Daisy-Chain Calculator for LED's!

Fellow Lighting Geeks,

The new LED revolution finds LL installers reverting back to the daisy chain method of wiring. Since wattages are much lower, it does make sense (in some installations) to tap off along a single wire run instead of using multiple home runs to Spider Splice locations.

I was curious about this so I made some calculations and was surprised to find that voltage loss is still an important consideration. This is especially evident when the higher-wattage LED fixtures are used, and when you need to combine incandescent fixtures and LED fixtures.

In some situations, you need to move up to the 13, 14, or 15V taps. In other situations, the voltage loss between the first and last fixture exceeds the voltage range of the particluar LED.

With this in mind, I created an Excel calculator that predicts voltage loss. (Eventually, I'll convert it into a web page.)

I strongly encourage anyone who likes playing with calculators, to download this calculator (beta version), put it to the test, and post feedback in this thread.

All who provide relevent feedback get a free CAST Lighting hat!

Download the new CAST System Calculator - Daisy Chain Version.

Thanks!
__________________
Steve Parrott
Communications Director
VOLT® Lighting

813.978.3700
stevep@voltlighting.com
www.voltlighting.com



Professional Quality at a Great Price
Reply With Quote
  #2  
Old 02-18-2011, 10:01 PM
RLI Electric RLI Electric is offline
LawnSite Senior Member
 
Join Date: Nov 2009
Location: Durham CT
Posts: 385
Steve
Make it into an app. A free one please
__________________
Bob Isleib
RLI Electric LLC
www.rlielectric.com
Reply With Quote
  #3  
Old 02-21-2011, 06:24 PM
NightScenes's Avatar
NightScenes NightScenes is offline
LawnSite Silver Member
 
Join Date: Dec 2005
Location: Kingsland, Texas
Posts: 2,196
For BB too, please! LOL

Thanks Steve!!!
__________________

Paul R Gosselin, Sr., CLVLT(#0632)
NightScenes Corporation
Director, AOLP
www.night-scenes.com
www.facebook.com/NightScenes
Reply With Quote
  #4  
Old 02-21-2011, 06:27 PM
steveparrott steveparrott is offline
Sponsor
 
Join Date: Jun 2005
Location: Tampa, FL
Posts: 988
Paul and Bob, did you try out the calculator? I'm really looking for feedback.

I also have a meeting tomorrow with my developer about the aps.

Thanks,
__________________
Steve Parrott
Communications Director
VOLT® Lighting

813.978.3700
stevep@voltlighting.com
www.voltlighting.com



Professional Quality at a Great Price
Reply With Quote
  #5  
Old 02-21-2011, 06:29 PM
NightScenes's Avatar
NightScenes NightScenes is offline
LawnSite Silver Member
 
Join Date: Dec 2005
Location: Kingsland, Texas
Posts: 2,196
Just now downloaded it so give me a few days Steve. I'll try it out.
__________________

Paul R Gosselin, Sr., CLVLT(#0632)
NightScenes Corporation
Director, AOLP
www.night-scenes.com
www.facebook.com/NightScenes
Reply With Quote
  #6  
Old 03-03-2012, 09:47 PM
JG Supplies JG Supplies is offline
LawnSite Member
 
Join Date: Mar 2012
Location: Seymour, TN
Posts: 1
[QUOTE=steveparrott;3905680]Paul and Bob, did you try out the calculator? I'm really looking for feedback.

I also have a meeting tomorrow with my developer about the aps.

Thanks,

Steve, I downloaded the spreadsheet and tested it using OpenOffice. The summing of the V/A per junction worked with Feet and Fixture V/A entries but the Total Wire and Fixture V/A's resulted in an error. #DIV/0. The Tap and Wire pull downs were used to select those values and not typed in. The Fixture V/A calculator worked OK. Hope this helps. Len
Reply With Quote
  #7  
Old 03-04-2012, 02:49 PM
steveparrott steveparrott is offline
Sponsor
 
Join Date: Jun 2005
Location: Tampa, FL
Posts: 988
[QUOTE=JG Supplies;4335479]
Quote:
Originally Posted by steveparrott View Post
Paul and Bob, did you try out the calculator? I'm really looking for feedback.

I also have a meeting tomorrow with my developer about the aps.

Thanks,

Steve, I downloaded the spreadsheet and tested it using OpenOffice. The summing of the V/A per junction worked with Feet and Fixture V/A entries but the Total Wire and Fixture V/A's resulted in an error. #DIV/0. The Tap and Wire pull downs were used to select those values and not typed in. The Fixture V/A calculator worked OK. Hope this helps. Len
I'm working on a new version of the calculator and will upload it today - still in beta version.
__________________
Steve Parrott
Communications Director
VOLT® Lighting

813.978.3700
stevep@voltlighting.com
www.voltlighting.com



Professional Quality at a Great Price
Reply With Quote
  #8  
Old 03-04-2012, 04:52 PM
Fireguy97's Avatar
Fireguy97 Fireguy97 is offline
LawnSite Senior Member
 
Join Date: Jun 2007
Location: Kamloops, in Beautiful British Columbia
Posts: 394
Quote:
Originally Posted by steveparrott View Post
I'm working on a new version of the calculator and will upload it today - still in beta version.
Am I missing something? I didn't get an xls file in the compressed file.

Tried to open with Excel 2003

Mick
Reply With Quote
  #9  
Old 03-04-2012, 05:29 PM
steveparrott steveparrott is offline
Sponsor
 
Join Date: Jun 2005
Location: Tampa, FL
Posts: 988
Quote:
Originally Posted by Fireguy97 View Post
Am I missing something? I didn't get an xls file in the compressed file.

Tried to open with Excel 2003

Mick
This is a strange quirk with Internet Explorer - it interprets an .xlsx file as a .zip file. It opens fine in Firefox or on a Mac.

Ed Lethert (The Low Voltage Guy) has taken on the development of this calculator as a work of passion. We've been going back and forth for months with various drafts and Ed has spent countless hours refining the calculations.

Unlike a calculator for incandescent lighting, LED's with their complex drivers inject variables that are not easily calculated. You'll see in the current version several refinements over the previous draft. These include the ability to use the calculator for the T-Method, temperature compensation, a +20% column for adjusting for errors that come in with very large systems, energy cost calculations, alerts when voltage ranges are exceeded.

By the way, to calculate a T-Method installation, use junction 1 to indicate where the homerun connects with the middle fixture. At that junction, put all the fixtures from the shorter leg of the T, then continue to enter each fixture junction on the second leg of the T.

For example if the set-up looks like this:

F1 F2 F3 F4 F5(T-Junction) F6 F7 F8 F9

Enter the first 5 fixtures at the first junction; then J2 is fixture 6, J3 is fixture 7, and so on.
__________________
Steve Parrott
Communications Director
VOLT® Lighting

813.978.3700
stevep@voltlighting.com
www.voltlighting.com



Professional Quality at a Great Price
Reply With Quote
  #10  
Old 03-04-2012, 07:15 PM
irrig8r irrig8r is offline
LawnSite Platinum Member
 
Join Date: Dec 2004
Location: Silicon Valley, CA
Posts: 4,545
Opens in Chrome.
__________________
Landscaper. Irrigator. Illuminator. Music lover. Coffee drinker.
Reply With Quote
Reply

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






Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ©1998 - 2012, LawnSite.com™ - Moose River Media
All times are GMT -4. The time now is 04:29 AM.

Page generated in 0.07194 seconds with 7 queries