10 years roof penetration and workmanship warranty, 10 years warranty that the system will provide at least 85% of the estimated energy, includes service calls and defects, but excludes acts of god, and the panels themselves have a manufacturer warranty on them. I want to say 25 years, but I'd have to dig it up. They've been monitoring the system and already came out to tweak some things without any prompting from me as well, so that was a pleasant surprise.