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<br />6 <br /> <br />Overview of Principal Elements <br /> <br />Figure 1: Overview of array, size 21.17 kW DC / 17.3 kW AC <br />This document outlines Apadana’s proposed roof mounted PV solar array located at the Little Canada City Hall. <br />The proposed system size is 21.2 kW DC / 17.3 kW AC, with panels on the southern facing roof. The panels are <br />Znshine 415W, which feature a 30-year productfon warranty. These panels are fixed to IronRidge racking, which <br />will hold the panels parallel to the roof. Apadana has years of experience installing this railing system on <br />pitched roofs across the metro area. A single SolarEdge inverter will be used, keeping down costs and upkeep. <br />Both Apadana and the system as currently proposed will meet the SPB grant requirements. If selected, <br />Apadana will be responsible for providing informatfon and supportfng preparatfon of documents to contribute <br />to the City’s grant applicatfon with the Minnesota Department of Commerce. <br />A site visit and a drone survey were done to gather informatfon and create an accurate layout for the panels. <br />Images from the drone survey were used to generate a 3D model, which we believe leads to more accurate <br />measurements. Other consideratfons such as required fire walkways are incorporated into the layout of the <br />roof. These points are discussed more in Equipment Layout. The roof surface appears to be in good conditfon. <br />The roof structure can be evaluated for loading if necessary. Apadana employs state licensed structural <br />engineers to confirm the integrity of the roof for permitting purposes or other needs. <br />Challenges from the site include the use of a temporary generator during power outages. Due to NEC and <br />utflity requirements, this will affect where we can connect the solar array to the existfng equipment. To comply <br />with these rules, the connectfon must be made in the basement at the CT cabinet for the electrical meter. <br />Trees castfng shade is another issue, with trees present directly to the south and west of the array. Shading <br />may increase as the trees grow depending on exact species of tree. The Equipment Layout sectfon lays out <br />these issues and any contfngency plans in detail. <br />We made decisions throughout to keep the costs of the system down and lay out alternatfve plans where we <br />see uncertainty. Apadana has extensive knowledge of installing all major components listed in this proposal, <br />applying for city and state grants, as well as years of working with public and private clients. Apadana will also <br />meet all deadlines as required for the Solar on Public Buildings grant submittal.