Attachment 1 - Grandview Cabin PV System SOW.pdf

Statement of Work Grandview Cabin Off-Grid Photovoltaic System

Kaibab National Forest – Tusayan Ranger District

General:

The Kaibab N.F. desires to obtain a quote to design, provide, and install an off-grid photovoltaic (PV) system to provide lighting, switches, and receptacles for a 2-room cabin and a PV equipment shed. The installation shall include pole mounted PV panels, underground circuit between the PV panels and equipment shed, exterior conduit and interior surface conduit and wiring, load center(s), wall switches, LED interior light fixtures, motion-detector operated LED exterior porch light fixture, and one 110-volt outlet each in the cabin and equipment shed.

The 314 sq. ft., wood-framed, 2 room cabin was built in 1934. It is listed on the National Register of Historic Places, which precludes mounting the PV panels on the roof as well as shading from nearby trees. The cabin is currently equipped with 2 wall mounted propane gas lamps that will be removed by the Forest Service along with the associated copper tubing prior to the start of this project. The cabin will be used for short-term rental to the general public seasonally from May-September. A propane space heater provides heating.

A 25 sf shed adjacent to the back end of the cabin shall be used for installing the PV equipment and load center.

This shed will be locked to prevent access by cabin users.

Location: The cabin is located approximately 16 miles east of the town of Tusayan, AZ. GPS coordinates are 35o 58’ 06” N, 111o 56’ 47” W, elevation 7150’, in Township 30 N, Range 4 E, Section 22, G&SRM. There are two access routes:

Access #1: The cabin is located approximately 16 miles east of the town of Tusayan on a graded gravel road.

Take Forest Road (FR) 302 east from Highway 64, just south of the Grand Hotel in Tusayan, for approximately 15 miles. At the junction of FR 302 and FR 310, turn left onto FR 310 and go approximately 1.6 miles to the Grandview Lookout Tower/Arizona Trail Trailhead complex. The entrance road to the cabin is just past the Trailhead parking area.

Access #2: (Note: Access #2 requires an entrance fee into the Grand Canyon National Park.) Via Arizona Highway 64 in the Grand Canyon National Park, from the South Entrance Station drive north 4 miles to a right turn on AZ

64. Follow AZ 64 east approximately 8.7 miles where you will see a left turn sign for Grandview Point. Continue driving east on AZ 64 for 2.0 more miles, to approximately milepost 252.7, and turn right onto an unmarked gravel road. Follow this road (which will become FR 310) 1.5 miles to the Grandview Lookout Tower/Arizona Trail Trailhead complex, the cabin entrance road is just north of the Trailhead parking area.

Scope of work Contractor shall size the PV system to power the loads shown on the drawings and described herein, including a minimum of 15% spare capacity for future connections. Expected use of the lighting is for morning and evening use by the occupants, frequent operation of all light fixtures simultaneously is expected. Contractor is responsible for securing all materials and equipment at the site during construction. Previous underground utility line excavation adjacent to the buildings showed generally sandy-clay soils to 3+‘ deep with a few rocks up to 6” in size.

Wiring for all light fixtures, switches, and outlets shall be concealed in wall and ceiling spaces where feasible or installed in plastic surface conduit and boxes such as Wiremold or Panduit when concealed installation is impractical. All work shall conform to the National Electric Code (NEC). The Contractor shall provide submittals of all equipment and light fixtures, along with PV system design calculations and one-line schematics, for review prior to installation.

115 Volt AC Electrical Loads:

Watts 150 10 cu.ft. refrigerator, approximately 26 kWh/month.

10 1 Kitchen LED ceiling light 15 1 Porch LED light 15 1 Under cabinet light 18 2 wall mount LED light fixtures (Forest Service provided) 24 USB wall receptacle 500 Equipment shed receptacle for occasional maintenance needs 25 Future toilet building lighting 757 Watts subtotal 113 15% additional capacity for other future loads 870 Total Estimated Watts

PV modules and mounting system: Contractor shall design, provide, and install a pole mounting system for the PV modules in the open area located approximately 30-40’ north of the equipment shed and just beyond the winter shadow line of the adjacent trees. Mounting system shall be capable of withstanding 30 psf snow loads and 70 mph wind gusts. Bottom edge of PV panels shall be at least 8’ above ground level to minimize vandalism and damage from the elk that inhabit the area. Provide and install all disconnects switches or circuit breakers as required by NEC. Roof top mounting is not acceptable due to the historical properties of the site.

Charge Controller: MPPT type with battery temperature compensation and remote temperature sensor, 3 stage charging regulation, digital display panel and keypad for programming controller and monitoring system parameters. This shall be mounted in the equipment shed.

Inverter: 115 volt, 1000 watt minimum continuous output, pure sine wave. This shall be mounted in the equipment shed.

Batteries: sealed AGM (absorbed gas mat) batteries designed for photovoltaic applications, minimum 3 day autonomy. These shall be located in the equipment shed.

Battery capacity meter: meter shall indicate the battery state of charge as a percentage of full charge in increments of 10% or direct digital readout, Midnight Solar model MNBCM or equal. This shall be mounted in the cabin interior near the stove.

Kitchen Ceiling light fixture: 115 volt, 10-12 watt LED light, minimum 675 lumens and 3000K soft white color rendition, surface or box mount, acrylic diffuser; Halo BLD 6 in. White Model #BLD606930WHR, as available from Home Depot, or equal.

Under cabinet light: 115 volt, 12-15 watt LED light, surface mount, 20-24” length, Amax Lighting Model #LED- UCW21-WHT as available from Home Depot or equal. Install a surface mounted snap switch adjacent to fixture if fixture is not equipped with a switch.

Wall mount light fixtures: The Forest Service intends to salvage and retrofit the 2 existing propane lamps with a standard lamp base and 115 volt, 9 watt A-19 LED bulb. Provide and install a wall mounted 3.5” round PVC light fixture box and wiring in the locations shown on the floor plan drawing.

Exterior porch light: 115 volt, 12-15 watt LED lights, 1000-1200 lumens, 180 degree motion detector activated, dusk to dawn sensing, surface mounted; Defiant model DFI-5998-BK as available from Home Depot or equal.

USB charger receptacle: 5 volt, 4.8 amp, 4 port, USB charger duplex wall receptacle shall be installed adjacent to the bedroom light switch to allow users to recharge small electronic devices. TruePower model ACE-9512HD as available from Home Depot or equal.

Refrigerator receptacle: It is desired to restrict cabin user’s access to the refrigerator electrical outlet to power their personal equipment that would adversely affect the inverter and battery capacity. Provide and install a 115 volt, 15 amp duplex receptacle with a lockable-when-in-use metallic cover. Taymac N3R Extra Duty 3.5-in.

deep Metallic Gray 1-Gang Expandable Weatherproof Electrical Outlet Cover, UFAST 8-in-1, H-Mount, Model #MX4380S as available at Home Depot, or equal. Contractor may propose other methods or equipment that achieves this requirement as an alternate.

Equipment shed receptacle: If the inverter is not equipped with an integral 115 volt GFCI outlet, provide and install a 115 volt, 15 amp GFCI outlet adjacent to the shed door for occasional building maintenance equipment usage.

The enclosed floor plan shows the light fixture, switches, receptacle, and proposed load center locations.

Specific requirements for certain locations are as follows:

1. Cabin Entry Door - wall mount the porch light above the center of the door.

2. Refrigerator – install the receptacle behind or adjacent to the refrigerator location shown on the drawing. This receptacle shall be on a separate circuit from the lighting loads.

3. Equipment Shed- Install one 15 amp receptacle for building maintenance needs. This receptacle will not be accessible to the cabin occupants. Receptacle can be on the same circuit as the building lighting loads.

4. The battery capacity meter shall be wall mounted in the cabin building interior adjacent to the stove so that the cabin manager and occupants can monitor the battery state of charge.

5. Provide circuit breaker space for a 15 amp, 115 volt AC circuit to serve a future restroom building.

6. Operations and Maintenance manual shall be provided for the entire system as part of the project.

7. All materials and design information shall be submitted for approval prior to purchase or installation.

The contractor will be allowed to use and stay at the cabin during the construction period.

Grandview Cabin and Lookout Tower site map. The cabin roof ridge runs N-S.

Pr op os ed

P V pa ne l l oc at io n

Equipment shed and Cabin, view is looking southeast.

Cabin, looking northwest. Taller shed houses a water storage tank.

Cabin interior views