Solar E. Technology is proud to develop an innovative multiplexing solar IPS system suitable for multiple unit apartments. Solar Multiplexing IPS can optimize system size and maximize use of solar energy available on the roof. When there is no use in any flat(s), the solar energy can be shared by other tenants and vice versa, minimizing waste of solar energy compared to individual systems. The Multiplexing Solar IPS comes fitted with separate energy metering device for each flat that allows tracking and monitoring of energy per flat. This can assist in sharing through a billing system. This system is also good for multi-user office or shopping complex.