Hercules high current BEC connections...?

[Leebert]

Hi guys,

A question for the electronics peeps...
I have received my herc BEC and it appears to have to inputs and two outputs. I was going to simply double up on the input side but, as I have a AR6200 rx I can only use one of the outputs.
As part of the fitting, the positive from the Align ESC is removed from the plug and I was thinking of fitting the positive of the BEC in it's place so there will be two positives and one negative connected to the rx from the BEC.
What do you guys think?
Thanks.

[Thomas]

I have the same unit, only with half the wires, are the pairs soldered onto the same bit of board?

[Leebert]

Yep.
2 inputs and 2 outputs.

[Thomas]

so if both red wires on the input are soldered in to the same joint and both blacks soldered together too then the spares will not do anything.

[Leebert]

I know what you mean. I was thinking of doubling up to reduce voltage drop. I think I may be going overboard though

[Andy from Sandy]

I would say it depends on what the size of the wire is. For instance a standard servo lead is only good for about 3 amps. So by having two leads coming from the BEC to the receiver will allow for a 6 amp load. On the input side you could connect two battery packs for redundency but again depending on the wire gauge one wire my not carry enough current for the total load on the output.

I haven't seen the spec but that is my guess.

[Leebert]

It's about the same as thick servo wire. Like for a strong digi one like a 9255 or similar.

[Thomas]

Blimey, we could be taking the radio loading a bit too far, most people are flying things with small wires going from reg/bec/battery to RX with no problems, all of a sudden the 500 comes along and we're all going to crash everything because of overloading.

[andys]

Just to answer your questions regarding the Hercules BEC

The first batch we had only had one set of leads, one in and one out, to spread the output load, we asked for this batch to have two leads out to the RX, this give redundancy if one cable comes out and help shares the load, if both are used, as the JR type connectors you plug into your RX are only rates at 3Amps, the HC BEC is 5amp continuous so it covers the possible load you can pull. The input leads to the BEC were Western Robotics getting confused about using to leads and added them to input and output. For the input you do not need to use both cables, although it will do no harm.

You can use one or both of the input/output leads, its up to you.

You can also use two Bec’s in parallel for 10Amps in larger applications.

Hope this helps

Andy
Real Raptors

[Andy from Sandy]

I doubt the comapany made that BEC for the trex 500. You described it as high current, therefore the manufacturer has put wire on it to suit. A different manufacturer has put three output leads on theirs and rates it to 9 Amps.

Think about putting it on a large plane where you have for instance servos doubled up on the control surfaces. Others on here have measured their servos with stall currents of 2 and a bit Amps. Now consider 3 of them on a CCPM setup.

My answers do not stem from the introduction of the T-Rex 500 by the way.

[Leebert]

Thanks guys.
I will wire it up using the two inputs and the one output to minimise any volt drop.