View Full Version : is 20 gauge wire too small?

12-22-2005, 03:56 AM
I purchased a 9.6v 8 2/3a 1100 mah battery, this configuration works well with my plane. I am running a geared 400 sized motor and a 20 amp esc. I do not now how many amps this configuration draws. Do you think it is ok to use this battery with these wires?

Bill G
12-22-2005, 04:34 AM
I wouldn't go with anything smaller than 18ga. Keeping the length as short as possible helps also.

12-22-2005, 06:50 AM
Most 6V Speed 400 draw approximatelly 10+ amps with a 9.6V battery pack. 20 gauge wires from the pack to the ESC is just a bit too small for that current draw.

I would not use anything smaller than 18 gauge also, though I would feel safer using 16.:)

12-22-2005, 07:13 PM
The short distances we use wire leads SHOULD not be a major factor.
Also, most packs are now supplied with silicone insulation to eliminate cooked rubber.
If you are not comfortable or do not have someone who can open the cover and replace the wires, DO NOT do it.

Flex the leads when you get a new pack. Rember how easy they bend back and forth. After 5 - 10 flights, flex them again. If noticeably getting stiffer, the wires NEED to be replaced or you need to measure how much current is being pulled by the motor at full speed.

12-26-2005, 07:58 AM
thanks everyone,

I did use the pack and it performed as well as my other pack with 18 guage wire. If it is recomended I will replace the wire some larger guage. I am comfertable doing this.

P.s. Im going to post my review on the 2 new planes I flew this week. Firebird freedom and multiplex easy glider electric.

thanks everyone.

12-26-2005, 03:39 PM
20 gage wire has roughly 2.5 times as much resistance to DC current flow as 16 gage and about twice as much as 18 gage wire.