Glow to Electric Conversions Discuss glow/gas conversion to electric here.

When to use Internal vs External BEC

Reply

Old 03-04-2014, 06:50 PM
  #1  
JKEpps
Thread Starter
My Feedback: (1)
 
JKEpps's Avatar
 
Join Date: Dec 2004
Location: Greenbelt, MD
Posts: 976
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default When to use Internal vs External BEC

Still climbing the electrics learning curve.

A few questions:
1.) When do you have to use an external BEC vs the one internal on an ESC. Is it a hard fast rule that when your supply batter is over 12v (from the "Everything you wanted ..." eBook) you have to use external?
2.) Are there any ESCs that have internal BECs that can handle the full voltage range that the ESC can?
3.) When and ESC says BEC - OPTO, what does that mean?
4.) Pros/Cons of an SBEC vs UBEC vs ?BEC

Thanks

-Jorden
JKEpps is offline  
Reply With Quote
Old 03-07-2014, 03:00 PM
  #2  
Dr Kiwi
Senior Member
 
Join Date: Dec 2002
Location: Chattanooga, TN
Posts: 2,198
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

1.) When do you have to use an external BEC vs the one internal on an ESC. Is it a hard fast rule that when your supply battery is over 12v (from the "Everything you wanted ..." eBook) you have to use external? 2.) Are there any ESCs that have internal BECs that can handle the full voltage range that the ESC can?
Some ESCs with internal BECs are rated for >12v (I've seen up to 26v) but I'm never sure whether they mean the ESC can cope with the higher voltage as long as you don't use the BEC! (Castle do that.. 3s, with BEC, 4s or more, without).. if they have switching BEC they may be okay.. but not if linear. I can't see an internal BEC being able to reduce 26V down to 5v without frying something

3.) When and ESC says BEC - OPTO, what does that mean?
This means there is no BEC so you must use an Rx pack or a stand alone BEC to power the Rx and servos

4.) Pros/Cons of an SBEC vs UBEC vs ?BEC
SBEC may refer to SportBEC (brand name), or may simply mean switch-mode BEC, UBEC (UniversalBEC) is typically a stand-alone BEC like the Castle 10A but HK uses SBEC and UBEC indiscriminately in their advertizing. Stock BEC with linear mode is the simplest and most limited in terms of delivering power to servos etc. At high voltage input, linear BECs get a lot hotter than the switching ones.

Last edited by Dr Kiwi; 03-07-2014 at 03:02 PM.
Dr Kiwi is offline  
Reply With Quote
Old 03-26-2014, 08:19 AM
  #3  
aeajr
My Feedback: (2)
 
aeajr's Avatar
 
Join Date: Jan 2003
Location: Long Island, NY
Posts: 8,567
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

EVERYTHING YOU WANTED TO KNOW ABOUT ELECTRIC POWERED FLIGHT
http://www.rcuniverse.com/forum/m_7100376/tm.htm


Dr. K did a very good job of covering your questions. This e-book may help broaden your understanding.
aeajr is offline  
Reply With Quote

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


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service