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5 <br />combiner boxes connect to an inverter which converts DC electricity to AC electricity. Single <br />inverter installations will be installed on a central inverter skid which is supported by driven or <br />concrete piers. If multiple, smaller inverters, are used, they may instead be installed on the <br />racking system. <br />The electricity from all of the inverters and step-up transformers will be collected via <br />underground cables at intermediate voltage to the solar project substation. The solar project <br />substation will transform the electric voltage from the intermediate level of 34.5kV to <br />the interconnection voltage (typically 69kV to 115kV). The electricity will be taken from <br />the solar project substation into the grid via an overhead high voltage transmission line <br />(HVTL). <br />Figure 5.Collection system example:(A)array;(B)combiner;(C)inverters under roof;(D)metering; <br />(E) meteorological monitoring and data communication hub; (F) transformer © 2015 Mario <br />Monesterio <br />OPERATIONS AND MAINTENANCE BUILDING <br />The O&M building for the project will be a single level, all weather, wooden, or metal frame <br />building approximately 3,000 to 5,000 square feet. It will house the equipment to operate and <br />maintain the facilities. It will provide access and storage for project operations and <br />maintenance. The location of the O&M building will be determined as design of the facilities <br />progresses.