HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Page 1/5  >  >>
Mydesign
User Rank
Platinum
Re: Power for carrying High loads
Mydesign   7/22/2014 11:35:08 PM
NO RATINGS
1 saves
Patb2009, thanks for the link and details.

patb2009
User Rank
Gold
Re: Power for carrying High loads
patb2009   7/16/2014 1:29:07 AM
NO RATINGS
apparently in 1974, UPS ran a small demo fleet of Electric converted jeeps.

 

https://about.usps.com/who-we-are/postal-history/electric-vehicles.pdf

 

Had they stuck that out, they'd be saving a couple billion a year.

 

 

Mydesign
User Rank
Platinum
Re: Power for carrying High loads
Mydesign   7/16/2014 12:36:47 AM
NO RATINGS
1 saves
"Battery was more then adequate and the short range  was ideal for a return every night to charge."

Patb2009, if required on the way it can get charged through various charging stations too.

Mydesign
User Rank
Platinum
Re: Power for carrying High loads
Mydesign   7/16/2014 12:34:51 AM
NO RATINGS
1 saves
"That's why i don't understand why it didn't happen to the USPS in the 70's. Battery was more then adequate and the short range  was ideal for a return every night to charge."

Patb2009, what is this USPS story in 1970?

patb2009
User Rank
Gold
Re: Power for carrying High loads
patb2009   7/11/2014 6:44:23 PM
NO RATINGS
That's why i don't understand why it didn't happen to the USPS in the 70's.

Battery was more then adequate and the short range  was 

ideal for a return every night to charge.

Mydesign
User Rank
Platinum
Re: Power for carrying High loads
Mydesign   7/11/2014 2:16:08 AM
NO RATINGS
1 saves
"For any trip under 30 miles roundtrip, electric is significantly better. What I don't understand is why the USPS never switched their whole fleet to electrics back in the 70's."

Patb2009, it's all depends up on the battery power and availability of charging points on the way.

patb2009
User Rank
Gold
Re: Power for carrying High loads
patb2009   7/7/2014 1:43:35 PM
NO RATINGS
It's not good, it's better, significantly better.

For any trip under 30 miles roundtrip, electric is significantly better.

What I don't understand is why the USPS never switched their whole fleet to

electrics back in the 70's.

 

The average mail truck goes 13 miles round trip, the average speed is only some 4 MPH, and the peak speed is only about 35 MPH,  There is almost zero requirement for highway speed  and these are operated from a fixed base by a bunch of procedure oriented, operational bureaucrats.  By going to EV the fleet maintenance becomes much simpler, and

given the short ranges you don't really need complex charging systems, just run 48 V DC out to the slots,  and a simple charge monitoring circuit to keep the batteries from cooking.

 

You have time during lunch to top off, and you have all night to slow charge, this is ideal.

 

 

Mydesign
User Rank
Platinum
Re: Power for carrying High loads
Mydesign   7/7/2014 5:22:40 AM
NO RATINGS
1 saves
"The brits have a half a century experience with electric milk floats. For anything with short range and low speed, they should all be changing to electrics."

Patb2009, you are right. its good in delivering low volume/weight to a short distance.

patb2009
User Rank
Gold
Re: Power for carrying High loads
patb2009   7/4/2014 1:59:53 PM
NO RATINGS
The brits have a half a century experience with electric milk floats.

For anything with short range and low speed, they should all be changing to electrics.

Mydesign
User Rank
Platinum
Re: Power for carrying High loads
Mydesign   7/4/2014 3:20:10 AM
NO RATINGS
1 saves
"FEDEX residential uses smaller trucks rather then the big Panel trucks. These would be ideal for Postal workers.  I actually don't know why the USPS didn't already convert their entire fleet to electrics. The average USPS delivery route is 13 miles, the vehicles return to the post office twice/day, the post office is an ideal bureaucratic fleet manager. Given the very low speed of the USPS fleet, you can use cheap motors and lead acid batteries."

Patb2009, it's a good option for mail and courier/parcel delivery. Since fuel costs are less, cost effective too.

Page 1/5  >  >>


Partner Zone
Latest Analysis
Because of the increasing ubiquity of wearable technology, it would be easy to think that design of wearable devices is routine and involves common design and engineering knowledge. Missed efforts in development will be remembered once the devices are used in the field
This grab-bag of new fasteners and adhesives work with a range of materials they can attach to, as well as a wide variety of applications. Several are for use in consumer applications, such as wearables or other compact electronic assemblies, and some of the adhesives have extended service temperature ranges and cure at room temperature.
Finalists have been announced for the annual Medical Design Excellence Awards (MDEAs), recognizing the best achievements in medical device design and engineering.
As governments, associations, and NGOs around the world seek to protect consumers, national and regional standards are becoming mandatory, challenging manufacturers and making testing and certification necessary for any product developed and brought to market.
No, we're not having delusions of grandeur -- this is the weapon of a Jedi Knight. And we're dying to see how it works. Today, we tear down a lightsaber.
More:Blogs|News
Design News Webinar Series
5/7/2015 11:00 a.m. California / 2:00 p.m. New York
3/31/2015 11:00 a.m. California / 2:00 p.m. New York
2/25/2015 11:00 a.m. California / 2:00 p.m. New York
12/11/2014 8:00 a.m. California / 11:00 a.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
May 4 - 8, Designing Low Power Systems using Battery and Energy Harvesting Energy Sources
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6 |  7


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Last Archived Class
Sponsored by Proto Labs
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2015 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service