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-   -   Looking for ESCs with built-in 7.4 BEC (https://www.rctech.net/forum/radio-electronics/908508-looking-escs-built-7-4-bec.html)

yifuqiao 01-22-2016 02:27 PM

Looking for ESCs with built-in 7.4 BEC
 
I am planning to buy another ESC.
My servo is a HV servo (Protek 160ss), it runs very well at 6v, but extra voltage can bump up the spec considerably. I think it will be a good deal to to get an ESC with higher than 6V BEC, cuz it also "upgrades" my servo at the same time.

I did some good research on this.
The only options I found are:
Tekin RSX
Tekin RS Gen 2
Toro 160A
And that is it.

Tekin RSX is way too much of a ESC for blinky.
Tekin RS Gen2, from what I have been reading, it doens't seems to be smooth.
Toro 160A seems to be a good option, but I am not feeling so confident about it after reading through the toro 120A threads.

Most threads on this topic were all made before 2014 or older.
It is 2016, I am just curious what other options do I have?

My current plan is getting the Tekin RS gen2, but I would like to hear other opinions before ordering it.

Edit: Not looking to get external BECs, cuz I just don't like having that many wires going on in my 1/10 touring car.

sacmiata 01-22-2016 03:30 PM

If your cant find a esc that outputs the higher voltage there is another option.



You can Wire the power from the 2s battery direct to the servo then just run the signal wire back to the reciever.

If your running a 1s then that won't work. 3s I thing you can wire to a balancing port. The 8.4 volts that you charge your lipo at for a 2s shouldn't matter as the lipo and servo all have a rating of 7.4 for a nominal voltage.

klaymon 01-22-2016 03:57 PM

I think the Tekin RS would be my choice right now.

On a side note, do not do as the other posted suggested and run straight LiPo voltage to the servo. 8.4 V doesn't equal 7.4 V. Nominal be damned. It's really 8.4 coming out of the battery and the servo is probably rated for 7.4 max.

yifuqiao 01-22-2016 04:04 PM


Originally Posted by sacmiata (Post 14359670)
If your cant find a esc that outputs the higher voltage there is another option.



You can Wire the power from the 2s battery direct to the servo then just run the signal wire back to the reciever.

If your running a 1s then that won't work. 3s I thing you can wire to a balancing port. The 8.4 volts that you charge your lipo at for a 2s shouldn't matter as the lipo and servo all have a rating of 7.4 for a nominal voltage.

Ya, I could do that ... but I don't like running it directly from lipo, cuz lip voltage could drop through the runs, and it will feel inconsistent.
Also... I d hate to do additional wire management , it doesn't look clean.

yifuqiao 01-22-2016 04:09 PM


Originally Posted by klaymon (Post 14359699)
I think the Tekin RS would be my choice right now.

On a side note, do not do as the other posted suggested and run straight LiPo voltage to the servo. 8.4 V doesn't equal 7.4 V. Nominal be damned. It's really 8.4 coming out of the battery and the servo is probably rated for 7.4 max.

Ya, I am still debating...
The thing I don't like RS gen2 is the esc itself + hotwire will be well over 190 new. I just feel like it is too much money spent just for that extra EBC voltage. :cry:

Maybe wait a few more years, then BEC with 7.4 volts may become popular?

racer1812 01-23-2016 08:27 AM

That servo specs at 127oz./.05 transit speed at 6v already. I certainly wouldn't make my ESC choice JUST so I could run it at 7.4v and get to 152oz./.04 transit.

Roelof 01-23-2016 12:10 PM


Originally Posted by yifuqiao (Post 14359711)
Ya, I could do that ... but I don't like running it directly from lipo, cuz lip voltage could drop through the runs, and it will feel inconsistent.
Also... I d hate to do additional wire management , it doesn't look clean.

You know that or you think that? A good LiPo will not drop that much and if it does a BEC will not help either....

Dave H 01-23-2016 12:22 PM


Originally Posted by yifuqiao (Post 14359711)
Ya, I could do that ... but I don't like running it directly from lipo, cuz lip voltage could drop through the runs, and it will feel inconsistent.
Also... I d hate to do additional wire management , it doesn't look clean.

As does the motor slow down a touch during the run. They tend to work in sync even. I did it for a long time with KO FET servos, including powered by nicad packs that dropped off a lot more than lipo packs do, and it seemed to work well enough. But to each their own of course.

Malazan 01-26-2016 10:01 PM

I think the Hobbywing XR 8 has a 7.2 BEC

sbd 01-27-2016 04:58 AM

Graupner
 
This graupner ESC may be perfect for what you want.

I have been using it for more than year and it is a blast...

avaldes 01-27-2016 07:20 AM

The Reedy 410R has a 7V BEC.


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