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No power to receiver

Old 02-04-2022, 03:36 PM
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Angler-Hi
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Default No power to receiver

Been 5 years since I built anything. Not getting power to my Rx with flight pack. I've used two different Rxs and both power up using a Rx battery. However, I'm not getting power when connecting ESC to Rx. I've concluded that the problem is not my Rxs or my ESCs, as I've used two of each and get the same results. This brings me to my question....I'm using a 6 cell 4000mah Lipo and after a full charge, I'm getting between 4.17V to 4.22V per cell, except for the 6th cell, which is reading 3.87V. Could my issue be caused by an ESC detecting an anomaly from the battery and therefore not putting power to my Rx? The only thing that I've found so far, is a cell not charging correctly or balancing. Yes, I charged the battery with the main leads as well as a balance lead. Battery was bought brand new and never used. Thanks.
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Old 02-04-2022, 05:11 PM
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ron_van_sommeren
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Originally Posted by Angler-Hi View Post
... I'm using a 6 cell 4000mAh Lipo ...
Does you controller, make/type?, have a linear or a switching BEC on board?

UBEC is an old propriatery brand name, a generic informationless acronym for a standalone BEC: Universal BEC.
I prefer LBEC,
linear, and SBEC, switching, because those two acronyms give very important info.


No more than three servos on a linear LBEC on 3s.
And no more than two servos on 4s.
The higher the power-pack voltage, the fewer servos a non-switching = linear BEC can handle. Switching BEC's hardly have this restriction.
The higher the battery voltage, the hotter a linear BEC will get, for a given current/load/servos.
Or, in other words ...
The higher the battery voltage, the lower the current a linear BEC can supply.

In depth:
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Old 02-04-2022, 07:00 PM
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solentlife
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Name and model of ESC please ?

A photo of the ESC label will tell us a lot ... I suspect you may have an ESC without BEC ...

As to Battery cell voltage ...... the ESC works on TOTAL voltage in based on its cell detection on power up .. you should hear 6 beeps on power up before the little tune. If you do not hear the 6 beeps - then either its a non BEC ESC and needs a separate BEC connected - or you tried a 6 cell battery on an ESC that's not rated for that high voltage and possibly burnt out the BEC .........

Label or details of it please ............

Oh - and please BALANCE charge LiPo's ............
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Old 02-04-2022, 10:04 PM
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Using an Electrifly silver series 60A ESC as well as a Grayson Hobby 80A HV ESC. Battery is a Turnigy 6 cell 4000mah. I've been doing this for a long time and never ran into this issue. Thanks. Would post pics but I don't remember having to use an alternative site to provide a url....
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Old 02-04-2022, 10:08 PM
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Maybe it's bc it's an opto-isolated ESC and I need to use a Rx pack?
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Old 02-04-2022, 10:13 PM
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I figured it out! Bc it was an opto- isolated ESC, a Rx pack needed to be used to power the Rx. The flight pack wouldn't do it bc the ESC lacked an internal BEC. Thanks guys!
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Old 02-05-2022, 08:45 AM
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Originally Posted by Angler-Hi View Post
I figured it out! Bc it was an opto- isolated ESC, a Rx pack needed to be used to power the Rx. The flight pack wouldn't do it bc the ESC lacked an internal BEC. Thanks guys!
As I suspected ...... why I asked for Brand / Model of ESC.

All you have to do now is either replace the ESC with a ESC with BEC - or wire in a BEC that is rated for 6S LiPo ..... be careful as many common BEC are rated to 4S ... check specs carefully.
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Old 02-05-2022, 06:16 PM
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Is it truly opto-isolated, or HobbyKrap 'opto-isolated', i.e. just BEC-less?
HobbyKrap messing concepts up again, lying about what opto-isolated truly is. A bit like throwing away the steering wheel of a car and selling it as a tracked vehicle.
Opto-isolation is used in high-power controllers to reduce electrical noise.

Last edited by ron_van_sommeren; 02-06-2022 at 03:55 PM.
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Old 02-06-2022, 12:17 AM
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Originally Posted by solentlife View Post
As I suspected ...... why I asked for Brand / Model of ESC.

All you have to do now is either replace the ESC with a ESC with BEC - or wire in a BEC that is rated for 6S LiPo ..... be careful as many common BEC are rated to 4S ... check specs carefully.
thanks brother.

Originally Posted by ron_van_sommeren View Post
Is it truly opto-isolated, or just HK BEC-less?. HobbyKrap messing concepts up again, lying about what opto-isolated truly is.
Opto-isolated controllers are usually high power controllers.
Yeah, it took me a minute to realize that, lol. Thanks.
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