Current HQ Energy Usage
The current 50 kW ground-mount array feeds both the HQ building and the lab. While significantly reducing their net consumption from the grid, Tyson’s goal of net-zero energy requires more generation than they have now.
Initial Solar Layout
Aurora is an industry-grade software used to create layouts of solar arrays and offer an initial idea of how the system will be interconnected. The images below show the panel layout with interconnections and its predicted performance.
Aurora provides a preliminary prediction of performance. A more detailed simulation was found using the NREL software, System Advisory Model (SAM).
Final Solar Layout
After discussion with Tyson and EFS Energy, we concluded that the simplest and most cost-efficient solution would be to place all of the panels on the ground in a plot of land just west of the HQ building. All of the Dynoraxx flat-roof racking can also be used as ground mount. Installation is much easier using one racking system rather than two. A model of this proposed layout was done using Helioscope, a software similar to Aurora, as a way to visualize the new proposed layout.
Inventory & Building Loads
Equipment Inventory & Budget
Most of the project equipment was inherited from the CRETE House project. The project still requires some additional material that will need to be purchased as well as engineering and design costs.
|Item||Add. Info||Price Before Tax||Source|
|Tesla Powerwall 2 AC||$0/item x 1 = $0.00||From CRETE House|
|SolarEdge Electricity Meter||$0/item x 1 = $0.00||From CRETE House|
|SolarEdge Inverters (7600W and 3600W)||Includes Auto Transfer Switch||$0/item x 3 = $0.00||From CRETE House|
|SunPower Solar Panel||$0/item x 31 = $0.00||From CRETE House|
|Dynoraxx Racking||2-Leg Baskets||$0/item x 12 = $0.00||From CRETE House|
|4-Leg Baskets||$0/item x 36 = $0.00||From CRETE House|
|PV System Components|
|SolarEdge DC Power Optimizers||SolarEdge P400||($0/item x 27) + ($71/item x 3) = $213.00||From CRETE House and to be purchased from Wholesale Solar|
|SDC Disconnect for Ground Mount System||4P/30A/600V DC||$350/item x 1 = $350||From Amazon.com|
|Wire (Panels –> Inverter)||10 AWG Wire||$89.99/250ft * 2 strings = $179.98||From Solar.com|
|Wire (Inverter –> Main Panel)||8 AWG Wire||$0.37/ft x 50ft = $18.50||Estimated 25 ft from inverter to panel in basement|
|Conduit (Ground Mount –> HQ)||3/4″ PVC||$2.59/10ft * 250ft = $64.75||From The Home Depot|
|Conduit (LLC, HQ Indoor)||1″ EMT||$10.40/10ft * 100ft = $104||From The Home Depot|
|Engineering Fee for DynoRaxx design||Ballast Plan Redesign||$100/design x 1 = $100||From DynoRaxx Design Team|
|Electrical Installation by Contractor||Solar & Powerwall Installations||$82.08/hr * 20hrs = $1313.28||From Missouri average cost for commercial electrician|
LLC Building Loads
We discussed critical loads that would be of interest in this building, listed in the table below, and used device specifications or educated estimates of power consumption for each load.
|Critical Load||Description||Power (W)||Product ID|
|Compost Exhaust Fan||Toilet exhaust fan||71||Fantech FR 150|
|LLC UPS 21144||UPS Battery System – Fully charged idle power||10||GXT4-6000RT208|
|UPS PDU||PDU for UPS System||5||AP7811B|
|House PDU||PDU for house load||5||AP7811B|
|TYS-MAINHOUSE-WU-SW-0||Network switch||101.5 (max)||WS-C3650-48PD|
|Conference Room Lighting/Fans||4 Fans (87W ea), with LED lights(17.5W ea)||418||HD-1994 BD E81964 82H4 (ZS)|
|Fire Alarm Panel||Fire Alarm Annunciators & Control Board||91.2||Simplex 4008|
|Fire Smoke Dampers||Mechanical Smoke Damper||9||Johnson Controls H2000/6 (estimated model)|