When a BEC is required

[Grizzly4x4]

Originally Posted by h.simas

thanks I just purchased castle link programmable BEC I will be installing them some time today

It might be possible to get away with one BEC for 4ws but that depends on rig weight, tire size, steering setup, etc. If each servo potentially draws 5 amps at stall (and most good servos above 250 oz-in will) you are pushing a single BEC pretty hard.

[The Violator]

Originally Posted by h.simas

is a bec a must when running four wheel steering?

[z50king]

I'm pretty sure I don't need a BEC for this combo. It should be great

[losikid]

Originally Posted by micro racer

Back to the original question after a brief break for shenanigans...

You need a BEC when your electronics cut out from going lock to lock once with a high power servo. (300 oz/in @.08 sec in a 4x4 sct with an sv3)

You also will need a BEC when you run a really low power servo (hs-645mg) with an extra half amp or so of lights.

At this size of vehicle, electronics calculations are more points of reference than things to do hard math with (vs a full size vehicle, where loads are more predictable and thus can be more accurately calculated). As I know from running my sct, constant vs. burst current varies greatly and both can sometimes be disconcertingly large quantities (puffing a 90c 4600mah, about 400amps burst; about 25-30 amps constant, giving ~10 minutes runtime completely at WOT). Being on the edge yet within the margin mathematically often doesn't work out in the real world.

Basically, use the math for general reference but not for determining specific limits (exactly how powerful of a servo can I put in before needeing a BEC?).

Originally Posted by z50king

I'm pretty sure I don't need a BEC for this combo. It should be great

I sure hope you're kidding...

[jdmguy760]

I'm running mmp with internal bec set at 6v for shift servo and servo winch and my bec set at 7.0 for servo .. was thinking to just use castle bec for it all instead of mmp for other parts

[MinuteMan]

I just ran outside and pissed on my electric fence...

Not only did my dick not blow off, its bigger now!

Based on this assessment I'm pulling the BEC's out of my rigs.

[svt923]

Getting an erection from an electric fence is not a sound basis for any decision.

[Raguvian]

Originally Posted by Grizzly4x4

It might be possible to get away with one BEC for 4ws but that depends on rig weight, tire size, steering setup, etc. If each servo potentially draws 5 amps at stall (and most good servos above 250 oz-in will) you are pushing a single BEC pretty hard.

Hmm. Sorry if this is threadjacking, but would I be fine with one 10A BEC for a 200 oz-in servo, a less than 100 oz-in Hobbyking $7 shift servo and 10-12 LEDs?

Maybe I should have just gotten the CC BEC Pro...

[Grizzly4x4]

Originally Posted by MinuteMan

I just ran outside and pissed on my electric fence...

Not only did my dick not blow off, its bigger now!

Based on this assessment I'm pulling the BEC's out of my rigs.

You do that minuteman. You go right ahead.

Originally Posted by svt923

Getting an erection from an electric fence is not a sound basis for any decision.

LMFAO!
But it only lasts a minute.

[micro racer]

Originally Posted by micro racer

Basically, use the math for general reference but not for determining specific limits (exactly how powerful of a servo can I put in before needeing a BEC?).

I guess that this part was a bit misinterpreted, probably because of poor wording. I am saying that even if your servo is supposed to pull 3 amps only at stall and your internal BEC maxs out at 3 amps, your electronics will probably black out. The servo is probably pulling a bit more power or the internal BEC is pulling less.

I was trying to say that specifications should not be used for hard limits, but for guidelines.

I do in fact know that a BEC is neccessary in almost everything.

[MinuteMan]

Yeah... I've made PLENTY of bad decisions when my dick was hard...

Now that my heads clear, I'll leave the BEC's in.

[gfmucci]

Originally Posted by micro racer

Back to the original question after a brief break for shenanigans...

You need a BEC when your electronics cut out from going lock to lock once with a high power servo. (300 oz/in @.08 sec in a 4x4 sct with an sv3)

You also will need a BEC when you run a really low power servo (hs-645mg) with an extra half amp or so of lights.

At this size of vehicle, electronics calculations are more points of reference than things to do hard math with (vs a full size vehicle, where loads are more predictable and thus can be more accurately calculated). As I know from running my sct, constant vs. burst current varies greatly and both can sometimes be disconcertingly large quantities (puffing a 90c 4600mah, about 400amps burst; about 25-30 amps constant, giving ~10 minutes runtime completely at WOT). Being on the edge yet within the margin mathematically often doesn't work out in the real world.

Basically, use the math for general reference but not for determining specific limits (exactly how powerful of a servo can I put in before needeing a BEC?).

Thanks. Most helpful comment yet.

If this thread ever becomes a "sticky", I hope that the 60% of the comments that sound like they were made after 3 kegs of beer at an Alabama pig roast are omitted.

[Grizzly4x4]

Originally Posted by gfmucci

Thanks. Most helpful comment yet.

If this thread ever becomes a "sticky", I hope that the 60% of the comments that sound like they were made after 3 kegs of beer at an Alabama pig roast are omitted.

He said the same thing as everyone else, just with more words.

[EeePee]

Originally Posted by gfmucci

If this thread ever becomes a "sticky"

Not happening. We already have 3297 of these same BEC threads.

[gfmucci]

Originally Posted by EeePee

Not happening. We already have 3297 of these same BEC threads.

But we have so many new newbies (like me) who like to ask the same question! But I guess if there was a "stickie" on this topic, it would deprive a newb like me from generating 50+ replies. Think of all the money I saved these people from track or bash time and not wrecking anything.

[allanon1965]

There was a sticky about BEC's..... By johnrobholmes

But from my understanding these stickies were unstickied cause people wouldnt/didnt read them before asking the questions that they answered. A little research before asking is apparently too much to expect?

[losikid]

Originally Posted by allanon1965

There was a sticky about BEC's..... By johnrobholmes

But from my understanding these stickies were unstickied cause people wouldnt/didnt read them before asking the questions that they answered. A little research before asking is apparently too much to expect?

Wholly shit, you're right. The stickies are missing. How long have they been gone?

[allanon1965]

A few weeks now I think....

[Solitaire]

Originally Posted by losikid

Wholly shit, you're right. The stickies are missing. How long have they been gone?

One of the moderators got bored (or overimbibed) one night and decided stickies were of no use to anyone.

[EeePee]

I've been unsticking threads for a long time. No one notices. Most of them are many years old.