A house that has any of the following characteristics which hurt a solar power system installation and investment: a shaded roof, small roof spaces, multiple roof vent pipes, expired roof material, breakable roof material, northern roof orientation, south, west or east chimney location, numerous roof lines, low dead weight tolerance, multiple floors, steep roof pitch, receives less than 5 hours of direct sunlight per day, absence of a utility net-metering program, monthly electric bill under $100, and less than a 200 AMP electrical service box.
Person 1: A tree shaded 800 squarefoot multi-level house built in 1970 with clay tile shingles, 100 AMP electrical service, a chimney on the west side with bathroom and attic vent pipes on the south facing roof in the front is totally solar coal.
Person 2: That's solar coal for sure!
Person 2: That's solar coal for sure!
by Sheldon's Solar, LLC November 30, 2010

by Mugsy DiaMecha July 16, 2022

by 2MUCHSWEG August 24, 2021

by P-Squilly January 14, 2024

Nobody wants to be labeled as a coal wool, but at least racial insensitivity has been e-raced (Yes, that was intentional)!
by Arnie Grape April 11, 2022

When a virgin male roofies himself in the hopes of losing his virginity with himself, but wakes up still a virgin.
by SCICT January 12, 2025

Rolling coal in the bedroom is when you take your favorite laxative, and chase it with a bottle of Pepto Bismol. This creates an explosive black diarrhea that you release at climax, usually across a wall or in the direction of a white curtain
by Curious~spacecraft July 2, 2024
