Electrical and plumbing licenses are not required to install solar in Kentucky.
A licensed electrician is required to pull the permit and be responsible for the final connection to the meter.
Licensing (Solar thermal)
A licensed plumber is required to make any connections to the potable water system. For SWH systems, those components which are not connected to the potable water system (typically, the solar loop beyond the heat exchanger) can be worked on by people who are not licensed plumbers.
Electric code: NEC 2011 edition