Founded in Honolulu, Hawaii in 1975, Inter-Island Solar Supply is a member of The Solaray Corporation (TSC) family of companies. TSC's core businesses focus on the manufacture and distribution of renewable energy components and systems, water heating and storage equipment, pumps, motors and controls.TSC does business in Hawaii and the Pacific Basin as Inter-Island Solar Supply (IISS). In addition to its Hawaii operations, TSC owns and operates SunEarth Inc., a California corporation and the leading American manufacturer of solar thermal collectors, systems and ancillary equipment. Inter-Island Solar Supply (IISS) has grown to become one of the world's most experienced wholesale suppliers of renewable energy components and systems. Our solar thermal and solar electric divisions are staffed by sales, design and engineering professionals that have what you need, when you need it, at an affordable price.IISS has five convenient branch operations in Hawaii located in Honolulu- Oahu, Kahului- Maui, Kailua-Kona & Hilo-, Big Island Hawaii, and Lihue- Kauai.