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Old 10-21-2011, 09:15 PM   #1
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Can u run a separate battery for the servo if u have a bec or no.
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Old 10-21-2011, 09:16 PM   #2
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Why run a seperate battery if you have a bec?
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Old 10-21-2011, 09:23 PM   #3
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because i want to get a servo that runs 7.4 lipo and i didnt know if the bec can put out that much
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Old 10-22-2011, 01:21 AM   #4
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CC BEC, what most of us use (the 10A one).... Castle Creations | CC BEC and CC BEC Pro
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Old 10-22-2011, 11:46 AM   #5
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Thats the one I have I just didnt know if it could handle the servo or not
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Old 10-22-2011, 11:50 AM   #6
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Originally Posted by thor_woody View Post
Thats the one I have I just didnt know if it could handle the servo or not
Did you even read the specs (near the bottom of the page......)
The small one puts out 10A @ plenty of volts. Probably 80% of people here, that use an external BEC, use the CC 10A BEC.
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Old 10-22-2011, 01:04 PM   #7
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It has to be set at 7.4v. It is 5v out of the box.
You need castlelink to program your voltage.
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Old 10-22-2011, 02:28 PM   #8
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I thought the whole point of the newer "high voltage" servos was that you didn't need a BEC, you could just solder them straight to the ESC's power wires, saving you weight, and simplifying the system a little.
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Old 10-22-2011, 02:49 PM   #9
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Originally Posted by meatmonkey View Post
I thought the whole point of the newer "high voltage" servos was that you didn't need a BEC, you could just solder them straight to the ESC's power wires, saving you weight, and simplifying the system a little.
Yes, you can. But your torque output changes as the pack voltage runs down. Most of the BEC's will maintain a constant voltage & amperage regardless of the input voltage (within reason).
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Old 10-22-2011, 03:10 PM   #10
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I thought the whole point of the newer "high voltage" servos was that you didn't need a BEC, you could just solder them straight to the ESC's power wires, saving you weight, and simplifying the system a little.
The purpose for HV servos is to get more torque and/or speed. The purpose of a BEC is to ensure that your servo has power when your rig gets into a bind.
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Old 10-22-2011, 04:31 PM   #11
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The purpose for HV servos is to get more torque and/or speed. The purpose of a BEC is to ensure that your servo has power when your rig gets into a bind.
Yep.
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Old 10-24-2011, 09:59 PM   #12
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The castle link is that the same one u use for the esc.
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Old 10-24-2011, 11:37 PM   #13
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The castle link, is that the same one u use for the esc.
Yes......
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Old 10-25-2011, 04:47 PM   #14
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Originally Posted by meatmonkey View Post
I thought the whole point of the newer "high voltage" servos was that you didn't need a BEC, you could just solder them straight to the ESC's power wires, saving you weight, and simplifying the system a little.
On a 1/5th scale gas rc this is ideal...but in our world its for more torque and speed as already stated. You still want a bec, or you'll be loosing like 30% of your torque and speed. between full charge and low voltage cut off
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Old 10-25-2011, 06:25 PM   #15
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On a 1/5th scale gas rc this is ideal...but in our world its for more torque and speed as already stated. You still want a bec, or you'll be loosing like 30% of your torque and speed. between full charge and low voltage cut off
This agrees with post #9.........
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Old 10-26-2011, 03:27 PM   #16
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I've never had an issue running my servos straight of the battery.

If you set your BEC to 7.4 volts, then even with a fully peaked 2s lipo your running less voltage than straight of the battery. And once the battery gets below 7.4 volts the BEC can't increase the voltage back up. So I don't see the advantage to running a BEC as long as you exclusively run 2s packs.


I guess my lipos dump so fast I can't really tell that the steering is loosing power because the LVC in the ESC cuts out first.
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Old 10-26-2011, 04:15 PM   #17
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I've never had an issue running my servos straight of the battery.

If you set your BEC to 7.4 volts, then even with a fully peaked 2s lipo your running less voltage than straight of the battery. And once the battery gets below 7.4 volts the BEC can't increase the voltage back up. So I don't see the advantage to running a BEC as long as you exclusively run 2s packs.


I guess my lipos dump so fast I can't really tell that the steering is loosing power because the LVC in the ESC cuts out first.
Although i've never tested it, i'm pretty sure the cc bec is a boost/buck switching regulator, so even if the battery drops below 7.4 volts, it can still supply a steady stream of 7.4 volts
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Old 10-26-2011, 05:15 PM   #18
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Although i've never tested it, i'm pretty sure the cc bec is a boost/buck switching regulator, so even if the battery drops below 7.4 volts, it can still supply a steady stream of 7.4 volts
+1, but (partly because I'm curious) I will check later.......
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