Specifications include, but are not limited to: The required work includes but is not limited to: design, furnish, and install a roof-mounted solar PV array and dual port level 2 electric vehicle charger at the Library. Narragansett is seeking proposals from qualified vendors to provide turn-key construction services for roof photovoltaic arrays and electric vehicle chargers. Qualified vendors shall have demonstrable experience and expertise in the design, permitting, installation, and commissioning of solar PV/electric vehicle charger projects, including securing public funding, grants, and other associated rebates for such work. Qualified vendors shall have a minimum of five (5) years’ experience in solar PV turn-key construction services and have completed at least three (3) projects of similar size and scope and at least one (1) publicly available level 2 EV charging station within the last three (3) years. Bidders shall submit a list of reference projects and owner contact information with their proposal. We request a PV System sized around 47.7 kW DC and a dual port electric vehicle charger capable of charging at around 7.6 kW per port. An array of this capacity would generate approximately 57,000 kWh annually, offsetting around 50% of its expected onsite electricity usage. The site may be able to support the development of a larger system; however, for budget and other reasons is being limited as described further below. The portion of the roof designated for PV is flat, but there are higher levels of rooftop nearby which may present shading of the northwestern portion of the rooftops shown in the top left of Figure 1 (see below). The roof assembly consists of 3/4” roof deck on existing wood trusses, followed by a vapor barrier, tapered insulation, 5/8” dens-deck cover board, and a single ply TPO roof. This is a new roof installed this year (2023). The structural engineering study found that it is feasible to support panels on the existing roof structure in the area shaded in light purple of Figure 1 below. Additionally, the rooftop HVAC equipment and building skylight limit areas available for development, and panel placement and configuration shall not require additional roof guards; the resulting area available for solar panels is shaded in blue in Figure 1. There are two proposed dedicated electric vehicle parking spots detailed in green next to the proposed site of the charger detailed in orange in Figure 1.
