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Bluefin
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PostSubject: More Viper Marine 15   Wed Feb 07, 2018 12:11 pm

I have the option to power the Rcvr via the ESC or direct from the battery. Anyone have pros and cons about either method - or a preferred option ?
Thanks...  Rolling Eyes
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barriew
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PostSubject: Re: More Viper Marine 15   Wed Feb 07, 2018 1:18 pm

Do you mean the drive battery or a separate battery just for the Rx? I usually only use the BEC function when space is tight and I don't have room for two batteries. Having said that, most of my models being small they do use the BEC Rolling Eyes
I assume you know that the switch on the Viper only switches off the electronics - it doesn't isolate the battery on consequently can drain the battery if another switch is not included in the battery lead, or the battery disconnected when not required.

Barrie
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Bluefin
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PostSubject: More Viper Marine 15   Wed Feb 07, 2018 1:43 pm

Hiya Barrie - thanks for your response. I have a pair of 7.4v battery packs connected through a distribution board. The board has a 6v output JR/Futaba plug which can be used to power the Rcvr directly.
The ESC is also powered from the distribution board with a separate output for the Rcvr. Having never been involved with boats before I was wondering if there was a 'preferred' option for powering the Rcvr.
(The instructions with the Viper state that if a separate Rcvr battery is used the power lead from the ESC must be disconnected - so no worries there !)
Thoughts and/or advice would be...and is...appreciated.
Very Happy 2thumbsup
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Roadrunner
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PostSubject: Re: More Viper Marine 15   Wed Feb 07, 2018 2:55 pm

There are no real pros or cons.

If you decided to power the reciver separately ensure you disconnect the esc’s power wire on the plug as plugging in the esc harness with 2 battery sources will over load and blow the
Reciver.

You do however have less issues with extra battery’s should you choose not to use a twin power method.

Downside is you have to ensure both power systems are equal ( meaning you can’t allow the receivers battery pack to run out or you end up with a fed boat stuck in full throttle at worse case if the reciver dies)

However you also get the continuing function of servos should the esc’s power fail abling at least some drift control.


Honestly tho there is no reason whatsoever to use a 2nd reciver pack as power. You can notice a speed slow down easily when the battery becomes low giving you enough time to return the vessel to dock.
Years ago I used to think on redundancy’s even to a point on some models that I used a failsafe which when the power dropped off I was able to toggle a micro switch to draw power from a secondary battery ( mainly used as ballest)
However this over engineering is more hastle than its worth. Given that most 7.2v battery’s will run a 540 size motor for 20 mins and a 400 size into 40mins, even brushless motors in the 1500-2000kp range would run for 40 mins using a standard nhmi 7.2 pack ( ignore lipos)
That said if your running with a la battery run times are dramatically increased. As an example I am able to run my triple prop grahpner Wiesel on a single 6v LA (3x400 motors) for an hour without slow down, or over 2 hours with a 12v.

After 20-30 mins I’m pretty much bored of running the model for a while and end up swapping to a yacht or something else for a bit on a sail day.

The choice is yours but imo not worth the extra issues that come with.



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Bluefin
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PostSubject: More Viper Marine 15   Wed Feb 07, 2018 4:17 pm

2thumbsup Thanks folks - appreciate the assistance. Will go away and consider - in the meantime, continue with the build !
Respect, Bluefin (AKA  - as in almost - Jolly - Roger) lol!
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