Most efficient way to wire BEC??

[big_poppa49]

What's the best way to wire a BEC? I have a Castle BEC that I'm wanting to put on my scx10 (stock electronics except for digital high voltage servo), and it looks like there is a couple different ways to wire them, either between the servo and battery plug or either wire the bec from battery plug to a spare channel on Rx and just plug the servo in the Rx like normal.

What's the best method and a diagram would be helpful, thanks.

BTW, since I only run 2s lipo I have been running my servo wired direct to my battery connector, then signal wire to Rx

 

[WHITE-TRASH]

If you're already running a servo good for 2s why do you want to go backwards and run a bec?

 

[big_poppa49]

Well I was thinking a bec would be a more efficient setup.....no?

 

[WHITE-TRASH]

If you were running a servo not capable of running direct 2s then of course a bec is needed. But since your servo will take it just leave it powered direct from the battery. No need to complicate things.

 

[big_poppa49]

What about my Rx being powered through the esc like I have it now, think that's fine?

 

[1967Typhoon]

What about my Rx being powered through the esc like I have it now, think that's fine?

Yup, it has worked like that for the last 20-25 years just fine. I think you are overthinking this one, bud. "thumbsup"

 

[Hydrocarbon92]

Even a high-end switchmode regulator will only be around 95%, meaning 5% of your power goes up as heat. Direct voltage doesn't loose that 5%. Almost no UBEC will allow for anything less than a 1 volt drop between input and output, meaning your servos will always be >1v lower than your battery voltage.

I can't speak for stock Axial receivers, but almost all others on the market can take 2S voltage no problem. It's the capacitors & regulators in servos that can't. If you power it by the ESC, then take the servo's red wire out of the 3-pin cable & connect it to the main battery lead (add a switch if you'd like, or not).

 

[big_poppa49]

So you think it's best to leave my servo wired directly to my battery like it is now, OR, run a BEC from my battery to my Rx then plug my servo into the Rx like normal?

Right now the servo wires + and - are run to my battery, and only the signal wire to the Rx. I'm running a RadioLink Rx and it says it's able to handle up to 10v.

 

[EeePee]

Re read the thread.

 

[big_poppa49]

Guess wire directly, like I have it now sounds best. I had read somewhere that running a bec to power the rx when the servo is under load it takes away from the esc's power, that would make since

 

[Hydrocarbon92]

Directly wired will give you the most voltage while a BEC will give you more consistent voltage (but always less).

The receiver doesn't pull much of a load, but it would potentially add some resistance as the electricity goes thru those thin pins. Also any time a powerful servo shares power with a receiver, there is always a chance for a brown-out.