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May 08, 2009, 02:19 PM
Registered User
Eyefly's Avatar
Question

Using a BEC as a voltage regulator?


Dont know if it has been asked before but can a BEC be used as a voltage regulator? Here is the situation. I have a large molded sailplane which I will be running a separate battery pack to power the on-board electronics. The battery is a 2 cell Lithium ion pack (8.2 volts). I need to use a regulator to bring it down to 5 volts and was thinking of using a castle BEC or a park bec. Seeing that the servos and receiver will be the only draw on the pack, will using this BEC as strictly a regulator be ok?

Thanks for the input...
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May 08, 2009, 04:43 PM
Innov8tive's Avatar
That is exactly what a BEC is, a Voltage Regulator. This is exactly what they are designed to do, so it would be a perfect use for the BEC circuit.

Lucien
May 08, 2009, 04:47 PM
Registered User
Eyefly's Avatar
Specifically, i have one of these and I want to use it as a voltage regulator for a two cell lithium ion pack. However it says that the input voltage has to be 9volts a two cell pack will be 8.2 volts. I am assuming this will not be enough and I will have to use a three cell pack or another BEC.

http://www.dimensionengineering.com/SportBEC.htm
May 08, 2009, 05:08 PM
Registered User
Odd that it indicates 9V minimum input. You might send a correspondence to Dimension to see whether it's been tested for lower input voltage before proceeding. Testing in the air is something that is generally discouraged.

FWIW, I've had nothing but success with these inexpensive BEC's and have used them in several high performance models. They work down to 5.5V input, to which I can attest.

http://www.hobbycity.com/hobbycity/s...idProduct=3735

http://www.hobbycity.com/hobbycity/s...idProduct=4319

Mark
May 08, 2009, 06:21 PM
Registered User
pilotpete2's Avatar
Have you considered running 2S A123 cells direct?
Pete
May 08, 2009, 06:56 PM
Registered User
Eyefly's Avatar
Yep, I will be looking into it before it is in the air. Works great on the ground though. I have it in an electric big Ceres and there is no way I will experiment with it in something so expensive. I can not fit the A123 cells in the fuse with all of the other stuff in it.
May 09, 2009, 07:10 AM
7000mw of raw power!
rich smith's Avatar
A 2s pack goes down to 6v not 8.2v so not even close to working.

Quote:
Originally Posted by Eyefly
Specifically, i have one of these and I want to use it as a voltage regulator for a two cell lithium ion pack. However it says that the input voltage has to be 9volts a two cell pack will be 8.2 volts. I am assuming this will not be enough and I will have to use a three cell pack or another BEC.

http://www.dimensionengineering.com/SportBEC.htm
May 09, 2009, 07:14 AM
Magicsmoke maker
Inflexo's Avatar
eyeFly,

Not sure what size or how many servos you're powering, but there's the BAC range of BECs which do what you want for smaller setups, including voltage reading and charge/on/off plug and socket.

http://nqrc.com/?vp=PLD-BAC-ESJ

and the BEC + alarm only

http://nqrc.com/?vp=PLD-BAC-004

Paul.
Last edited by Inflexo; May 09, 2009 at 07:15 AM. Reason: Name correction.
May 09, 2009, 11:09 AM
Registered User
Joespeeder's Avatar
Hi Eyefly,

Dimension has a ParkBEC that works with 2s-8s so input voltage is 6v and up.

Joe



www.thecaterhamproject.com


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