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djbroughton's avatar
djbroughton
Explorer
Feb 23, 2015

Trying to use small inverter through cig. lighter adapter

I am trying to run my CPAP machine from a light fixture above the bed instead of through the main inverter. I wired a 12 v cigarette lighter outlet into the fixture. The voltage reads 12.5 v and I can...
accsys's avatar
accsys
Explorer
Feb 24, 2015
Most 12V lights only pull an amp or two at most so the wire for that light is much too small to carry the 8 to 10 amps or more required for your inverter to feed the CPAP. Get an extension cord (at least 14 gauge), cut the A/C plug/sockets off and run it from the batteries to the cig light. Just use the white and black wires and you will not need the ground (green) wire in the ext. cord but do put a 15 amp fuse in the line for protection.

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