Wiring in a power switch for the RX battery - HeliFreak
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Old 05-13-2018, 09:34 AM   #1 (permalink)
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Join Date: May 2012
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Default Wiring in a power switch for the RX battery

I am putting together an Align 600E Pro DFC with Align DS610 swash servo's and a DS650 tail servo. I am using a Hobbico LiFe Source 2100 mAh RX battery. The battery has a main power lead with a Dean's plug with 14 ga wire, two servo connector leads with 22 ga. wire and a balance plug with 24 or 26 ga. wire (not sure because gauge not printed on insulation)

On some 4 channel planes I wired the switch through the balance plug on the battery because I wanted to be able to charge the RX battery through the switch. If I do the same for the heli, I am concerned that the 24 or 26 ga and the JST-XH balance plug will not be able to handle the current drawn by the servo's (and RX).

Per https://www.powerstream.com/Wire_Size.htm 24 gauge is rated at 3.5A for "chassis wiring" and .577A for "power transmission." Not sure why the difference but being conservative and recognizing that I am powering the servo's with it, I am looking at the .577 A limit. For 26 gauge, it is of course worse with the numbers being 2.2A and .361A respectively. The JST-XH plug, I am told, is rated at 3A.

I am reluctant to wire it the same way through the balance plug because of these limits but am seeking advice.

The other option which I am leaning toward is wiring the switch to the servo connector leads which are 22 ga. wire but the rating on that size is 7A chassis and .92A power transmission. That would make it slightly more complicated to charge but that is acceptable. Should I be concerned with the current draw for the heli exceeding the limit for even the 22 ga. nd servo connector which I believe is rated at 5A?
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Old 05-29-2018, 04:30 PM   #2 (permalink)
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switches fail and get faulty connections. best to plug in directly and eliminate as many failure points as possible.
I don't trust the small servo connectors as an each time connect so I run it off my deans. Made a deans to servo wires and done.

I have a switch on my Nitro but it is an old fromoco and closed is off open is on for the regulator. Old school.

That being said it can still fail, but it carries no load.
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Old 06-02-2018, 10:58 PM   #3 (permalink)
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I would use the deans or swap it out for some other appropriately sized connector.

As said i would stay away from connecting / disconnecting the normal servo plug.

The only place i use a switch is on a back up battery. Never the main rx pack / supply.

I always power the heli on with the secondary battery to make sure it works. This is with a kosmik.
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