BEC cut off point - RC Groups
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Jun 05, 2002, 07:33 PM
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Alfred's Avatar

BEC cut off point


Does anyone know at what voltage the BECs on the little GWS 100 ESCs cut power to the motors?

Alfred
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Jun 06, 2002, 07:04 AM
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Larry Dudeck's Avatar
BEC is the 'battery eliminator circuit'. This is that part of the speed control circuitry which powers the receiver from your flight battery, eliminating the need for a receiver battery.

Are you refering to the 'low voltage cutoff'?
Jun 06, 2002, 07:32 AM
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Alfred's Avatar
Yes I mean at what level does it cut off.

Alfred
Jun 06, 2002, 11:44 AM
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Larry Dudeck's Avatar
Quote:
Originally posted by Alfred
Yes I mean at what level does it cut off.

Alfred
I have read where most ESC's will have a LVC around 5 v.
Jun 07, 2002, 01:57 AM
BEC
BEC
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BEC's Avatar
Quote:
Originally posted by Larry Dudeck


I have read where most ESC's will have a LVC around 5 v.
Many do. A lot don't. The best ones base the cutoff on the battery voltage when they're first fired up, so as to not over-discharge the drive battery. This is more important as the cell count goes up.

Even those that do have a fixed cut off (common in inexpensive ones) vary widely from about 4.5V to nearly 6.

I haven't had a GWS ESC so I can't say what it is, but I'd expect it to be somewhere between 5.0 and 6.0V.
Jun 07, 2002, 07:12 AM
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Larry Dudeck's Avatar
BEC,

I have wondered about the LVC on high cell count. Since I am flying no more than 8 cells and try not to flatten a pack in flight it has not been a problem. All of my ESC's are the inexpensive JETI types.
Jun 08, 2002, 05:23 AM
Crash Master
Gene Bond's Avatar
https://www.rcgroups.com/forums/show...&highlight=lvc

Standard cutout appears to be 4.2v, if you disable the lvc, it's 3.5v.