I have done this power layout to ensure power failsafe if something goes wrong.
Is it safe to feed in to different BEC's on the input side? (not the outputs)
The 2 becs on the 7.4's are the same the one on the 14.8 is probaly .2 different, but that sould not be a problam because se APM is setup to take power from somewhere else.
The reason why I done this layout is that when the motor fails I still have servos and apm and if anyone of the 7.4v fail I have another one powering the apm and the servos, I recon the reciver will power the APM if the other 7.4 fail.
Looks good to me Christiaan, I do similar but use a batshare device and double the batteries to my RX and I also separate power to input and output rails as you do. I believe this save's us from a lot of the issues we see with brown outs and such, not too mention the fault tolerance it provides. Because I use the batshare I do not have to worry on either side of the input of output that power will be lost, as well on the RX. So I have backups to both input and output and RX in less then a 1/2oz product. Check it out from Cermark, called the batshare.
I found it.
Can you please show me screen shots of your setup?
This is interesting, care to share a little bit more about your setup (wiring schematics an configuration).
I am still in the designing phase and the I want the perfect power system. I used a one battery system to power everything and lost a plane that way because of a faulty solder.
And what sense? If refuses APM that you can make of nothing. Reliability remains former
If all BECs are linear and I presume 5 volts you might get away with this, I often paralleled linear BECs from identical ESCs without ill effect.
However, if any BEC is a switcher it will not work, switching BECs definitely do not like being paralleled.
They actively sample their outputs and if they see another power supply they compensate inappropriately.
However, if one BEC fails in your system it can either go to a short or an open. If it goes to an open your other BECs can take up the slack. If it goes to a short it will simply take out the other BECs too and worse since you are using the APM as the combiner it might take it out too.
Something like the above Bat Share device is a generally better solution because it will deal with either failure mode.
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