|
| LinkBack | Thread Tools | Display Modes |
01-11-2012, 12:03 AM | #1 |
Pebble Pounder Join Date: Dec 2011 Location: Granada hills
Posts: 101
| A little confused with BECs
So I've done some reading up on BECs and I kind of understand it for rc planes but I'm a bit confused when it comes to rc cars. I have a tekin rs and the on board bec says it outputs 6 volts. I also have a hitech 645 servo and it says that it can take 6 volts. So if run a 3s lipo why will I need to install a BEC? What am I missing?
|
Sponsored Links | |
01-11-2012, 12:11 AM | #2 |
RCC Addict Join Date: Jan 2007 Location: caldwell,idaho
Posts: 1,309
| Re: A little confused with BECs
from what i understand the esc only puts out so much voltage for the servo ,even though it can handle 11.1 volts .so it must have some sort or regulator so it won't burn up your servo the castle bec can be programmed for higher voltage for servos that can handle the higher voltage with the programming cable.
|
01-11-2012, 12:28 AM | #3 |
RCC Addict Join Date: Oct 2011 Location: British Columbia
Posts: 1,487
| Re: A little confused with BECs
It's not the voltage, but the amperage the ESC can handle. Most users running 3S LiPo's and super strong servos use 10 amp BEC's to handle the load. Many ESC's can only handle 5 or 6 amps.
|
01-11-2012, 12:52 AM | #4 | |
Pebble Pounder Join Date: Dec 2011 Location: Granada hills
Posts: 101
| Re: A little confused with BECs Quote:
| |
01-11-2012, 05:36 AM | #5 |
Rock Stacker Join Date: Aug 2010 Location: Guam
Posts: 57
| Re: A little confused with BECs I dont have a tekin, in theory Yes your stock bec volt shouldnt exceed 6v. If you want to get more volts thru your servo then yes you would need an external bec, via programming it.
|
01-11-2012, 06:54 AM | #6 |
Quarry Creeper Join Date: Mar 2010 Location: Los Angeles
Posts: 255
| Re: A little confused with BECs
The magic question here is how many amps do servo's draw? This data is never published in servo spec's. I emailed both JR and Hitech and received no response. I've spent quite a bit of time Googling this and never found anything definitive. Does anyone have any published data that documents this?
|
01-11-2012, 07:40 AM | #7 |
RCC Addict Join Date: Apr 2009 Location: Token's life matters
Posts: 1,836
| Re: A little confused with BECs
Since I have never spoke on this subject I will weigh in. Why are you fighting it? $23 for a bec. They are like prison sex, you can fight as hard as you want, in the end its gonna happen. My advice is to try it without. BUT do not post all the stupid questions about why your car goes nuts when you turn, why it loses power, why it burned up the esc and servo. Just do it and prove everyone else wrong on why they added a BEC and did not have issues without one. Or you could just add one because the stock bec inside all esc's was meant to power a 60 ounce servo in an on road car with a 3" tires. Unless thats what you have an external power source would be a great idea to power your servos. |
01-11-2012, 07:57 AM | #8 |
20K Club Join Date: Jul 2004 Location: Sending illegals home one Hayabusa at a time.
Posts: 22,981
| Re: A little confused with BECs
Unless you want to get into the physics of how going up in voltage drops the power of the internal BEC just buy the stupid thing. I'm also moving this out of the Wraith forum. This is an ELECTRONICS question that has nothing specific to do with a wraith. |
01-11-2012, 10:04 AM | #9 |
RCC Addict Join Date: Feb 2010 Location: a house
Posts: 1,986
| Re: A little confused with BECs
HEY DAVIDQ19 if you dont think you need one then dont get a BEC, apparently you have all the answers and you know what works and what dosent. youve got threads all over asking the same stupid stuff. several people have answered your questions allready but you still seem to know better.
|
01-11-2012, 10:13 AM | #10 |
I wanna be Dave Join Date: Nov 2010 Location: 07456 N. NJ USofA
Posts: 8,314
| Re: A little confused with BECs
David, sorry, we get a bit wound at times since this is a common question. Yes your ESC BEC can supply 6vdc to the servo. Yes, your ESC BEC can supply some amount of amps to your servo. When you jam the tires between rocks and what to turn your tires, or, you did not set the steering EPA's correctly, even a low torque can draw quite a few amps. My general rule of thumb, up to ~200inoz rated servos can work OK just off the ESC BEC. After that, you run out of amp supply which WILL cause a RX "brownout". This means the rig may stop, the rig may glitch, you may burn out the servo or ESC. Above ~200inoz, you WILL need an external BEC (unless you run a Holmes Hobbies BRXL ESC) to get maximum use out of your servo dollars spent as well as save the rest of your electronics. Your choice. Have a nice day. PS, search in the electronics forum for "brownout" to see what people describe and what the solution is. |
01-11-2012, 10:18 AM | #11 | |
I wanna be Dave Join Date: Jul 2009 Location: Rancho Relaxo. California. USA. Earth.
Posts: 3,292
| Re: A little confused with BECs Quote:
To the op: if you were running 2s you could *probably* get away without a bec, although still not healthy for the electronics. But since your esc has to kick down the voltage about half (12.6 to 6) for the internal bec, not only does the amperage spec go down its working too hard. Just get one and sleep more soundly at night. You will never even thank anyone that your stuff is still working, it'll just keep working. | |
01-11-2012, 10:40 AM | #12 |
I wanna be Dave Join Date: Nov 2010 Location: 07456 N. NJ USofA
Posts: 8,314
| Re: A little confused with BECs |
01-11-2012, 12:08 PM | #13 |
Pebble Pounder Join Date: Dec 2011 Location: Granada hills
Posts: 101
| Re: A little confused with BECs
Got it, thanks for all the info. Sorry for posting similar threads just new to all this and just trying to get some info and oppinions.
|
01-11-2012, 12:10 PM | #14 |
20K Club Join Date: Jul 2004 Location: Sending illegals home one Hayabusa at a time.
Posts: 22,981
| |
01-11-2012, 12:27 PM | #15 | ||
PapaGriz Yo Join Date: Apr 2004 Location: In the garage building the wife a crawler
Posts: 13,137
| Re: A little confused with BECs Quote:
Back before there were external BECs I posted this about running a voltage regulator. Quote:
| ||
01-11-2012, 02:37 PM | #16 |
Newbie Join Date: Jan 2012 Location: Las Vegas
Posts: 48
| Re: A little confused with BECs
Im so confused....Im just gonna go order one.. |
01-11-2012, 02:37 PM | #17 | |
I wanna be Dave Join Date: Nov 2010 Location: 07456 N. NJ USofA
Posts: 8,314
| Re: A little confused with BECs Quote:
| |
01-11-2012, 05:21 PM | #18 |
PapaGriz Yo Join Date: Apr 2004 Location: In the garage building the wife a crawler
Posts: 13,137
| Re: A little confused with BECs |
01-11-2012, 07:06 PM | #19 | |
Quarry Creeper Join Date: Mar 2010 Location: Los Angeles
Posts: 255
| Re: A little confused with BECs Quote:
| |
01-11-2012, 07:41 PM | #20 |
I wanna be Dave Join Date: Sep 2009 Location: Nor Cal
Posts: 2,213
| Re: A little confused with BECs
This is such an interesting and informative tech thread! I think I need to go buy one of these so called bec thingies |
A little confused with BECs - Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Would this becs be any good | TRIGGER | Redcat Crawlers | 0 | 02-21-2011 10:26 AM |
becs help needed | TRIGGER | Redcat Crawlers | 5 | 01-20-2011 11:28 PM |
do becs really work? | CubCadet Pulling | Redcat Crawlers | 10 | 11-26-2010 10:44 PM |
BECs!!! | fallensk8man89 | Electronics | 16 | 07-02-2010 09:08 PM |
need help on becs | axial goats | Axial AX-10 Scorpion | 1 | 08-23-2009 05:57 PM |
| |