3000W Chinese Gensets Info.

Brushes are just chunks of carbon. Nothing will really bother them. The only contact surface that will suffer degradation is the slip ring that they run on. It’s copper or brass and will suffer oxidation with contact with the elements. The green sheen as you would call it. On slip rings on a rotating field generator, the oxidation isn’t really much of a problem. The field coil is relatively low current, so nothing will be damaged by a little bit of poor contact until the brushes run on the rings long enough to clean them by normal friction.

Now I have books covering the prepping and maintenance of brushes and commutators. But that is mainly for high current brush systems. Where poor contact will result in burning and scorching of contact surfaces. Not a problem in your champion.