From: Mast, Joyce C
Sent: Wednesday, June 26, 2013 9:32 AM
To: Beverage, McKenzie; Johnston, Morgan B
Subject: RE: ECE Solar Installation Status Update

McKenzie,

Thank you for checking with me about the status of the Solar Installation on the North Parking Garage. I expect that no funds will be spent on the SSC account before the end of the fiscal year. We need results from the feasibility study for placing the panels on the North Parking Garage roof before we will be spending money on the panels or installation.  The study is to be officially completed by September 6, 2013, but we expect to  have drawings and plans by July. This will give us enough information to seek more matching funds so that the panels may be installed in time for the July 2014 completion date for the new building.  

Best regards,

Joyce Mast

Yesterday’s meeting covered more refined and detailed breakdown of the following topics, most of which were discussed in prior meetings, with the exception of the newly introduced structural support “Space Frame” option.

• Panel layout configurations for truss mounted structural frame- 4 sections of seven rows at approx. 100 modules/row or four sections of six rows also 100 modules each. Truss mounting providing specific spacing for mounting dimensions. Also mentioned types of Truss material recommending tubular over welded angle, siting weatherization, degradation, appearance and animal habitat prevention as main reasons.
• Space Frame structure was introduced as a favorable option.
• A space frame is a structure system assembled of linear elements so arranged that forces are transferred in a three-dimensional manner. In some cases, the constituent element may be two dimensional.
• Macroscopically a space frame often takes the form of a flat or curved surface.
• It should be noted that virtually the same structure defined as space frame here is referred to as latticed structures in a state-of-the-art report prepared by the Task Committee on Latticed Structures [2], which states
• A latticed structure is a structure system in the form of a network of elements (as opposed to a continuous surface). Rolled, extruded or fabricated sections comprise the member elements.
• Another characteristic of latticed structural system is that their load-carrying mechanism is three dimensional in nature.
• Space frame benefits although more costly up front were presented as prefabricated, galvanized and powder coated, sturdy, longer Life cycle and less maintenance, but requiring cranes and other installation costs. They also have installer requirements for mounting solar array as to maintain the integrity of the coating and protective surfaces. Provided flexible mounting spacing to help maximize power output and minimize shading.
• Inverter layout revisited with schematic diagram presented illustrating component placement and wiring layouts.
• An overall electrical schematic was presented identifying key component placing and overcurrent protection limits and needs, along with electrical room Layout.
• Metering usage stated existing meters could be utilized with the addition of a revenue grade power production meter to monitor the array output.
• Single line diagram was presented identifying current and project components, mentioning the output potential of 1400-1600 amps at 480 volts.
• Introduced idea of rainwater harvesting for irrigation or toilet flushing usages.
• Procurement procedures mentioned and moved as major topic for next meeting with concerns of turnkey type purchasing being the industry norm verses purchasing standard variety purchasing from multiple vendors in normal construction.
• Next meeting PEP is having the structural Engineers present design considerations, and Mr. Jim Lev will have construction procurement representative attend.