License requirements for solar panels and related equipment in Washington State
There are no specific license or registration requirements for solar panels and solar inverters in Washington State. However, general NEC and IIEE standards would apply as are applicable to all electrical components. There are also requirements for warranties to be give to customers on panels and inverters.
Licensing requirements for Solar Power installation companies in Washington State
There is no specific solar power installation qualification that is mandated in Washington but contractors must be licensed as electrical contractors. Customers can check out a contractors status on the Washington Labor and Industries website.