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Twin EDF

alan p

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Working on a twin edf model and need confirmation of wiring setup regarding the esc's. I am aware of the need to isolate one red(positive) wire for 3s , but is it the same requirement on 4s. Have checked the Tony Nijhaus site but no guidance on the A10 setup there.

I have two 50amp overlander esc's and their site does not give guidance  on twin setups, will a ubec be needed.

this is my 2nd edf build 1st was a single unit.

Any help will be appreciated.

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Alan the need to disconnect one red lead isn't because of the cell count, but if you have two BECs in operation they maybe working at a slightly different voltage so the higher voltage one then back feeds the other BEC. Several people run twin ESCs with both BECs connected, but if you want to guard against this potential mis-match the the options are to either fit diodes in each +ve line or disconnect one (or use ESCs without an internal BEC, usually opto types and a separate BEC)

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From a purely technical point of view the need to disconnect the red wire from one of the ESCs depends on the mode of the BEC. If it is a switching BEC (most likely with a 4S ESC) they pulse the power on/off to give a 5V average but their voltage regulation can become confused with the voltage pulses sent by the other BEC. It is safer to run on one BEC.

Old style 'linear' voltage regulator BECs just regulate to an internally set voltage (they simply dissipate the excess energy) so two (or more) can be safely be left connected although the one with the highest set voltage will do virtually all the work.


If your servo load is high and likely to be close to the single BEC amp limit it may be better to use a stand alone BEC and disconnect both ESCs. EDFs tend to work their ESCs quite hard so they can fail and there is a fair chance it will take out the BEC at the same time. Sods law being what it will be the one that is providing the power to the Rx and servos! 

It is perhaps worth noting that you are more likely to crash an EDF from 'pilot error' than a ESC BEC failure as long as everything is working within its specification.😉        


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