DF140 - adding electrical accessories

[K Holmes]

I want to install a windscreen demister / heater to my boat. It runs a single DF140. The demister draws 20 amps. What is the allowable power draw the DF140?

[larrysuzuki]

Alt output

The alternator puts out 40 amps.

[larrysuzuki]

Alt

The power wire should be hook up to a fused battery connection of the proper gauge wire.