This document outlines a plan for three distinct solar projects. This revision standardizes all arrays to the 15 kWp PV equivalent footprint and ensures full integration with the homestead's universal construction standards (rammed earth, concrete slabs, and VHRS modules).
The plan details three implementation scenarios:
All scenarios assume integration with pre-existing infrastructure: a 4,000-gallon thermal battery and a 40 kWh electrical battery bank. Costs and labor for this existing equipment are excluded.
Disclaimer: All figures are budgetary estimates. A formal quote from qualified local installers is mandatory.
1.1. Collector Arrays:
1.2. Thermal & Electrical Storage (Pre-Existing):
1.3. Water-Source Heat Pump: A high-efficiency vapor-compression heat pump (utilizing R290 or R744) integrated with the thermal battery. As specified in the energy-infrastructure-specification, this heat pump performs Active Thermal Lifting, using surplus PV electricity to "lift" heat from the collector loop into the central 4,000-gallon battery.
1.4. Climate Control (Universal VHRS):
1.5. Balance of System (BOS): Standard mechanical, electrical, and control systems (including ESP32-based PID controllers and VFDs for all pumps).
1.6. Water & Snow Management System:
Note: Pre-existing Thermal and Electrical batteries are excluded.
| Component / Item | Stand-Alone PV/T | Integrated Roof PV/T | Greenhouse Thermal-Only | Notes |
|---|---|---|---|---|
| CAPEX (Capital Expenditures) | ||||
| Collectors | $14k - $27k | $14k - $27k | $20k - $40k | Standardized to 15kW equivalent. |
| Inverter & Electrical BOS | $8k - $12k | $8k - $12k | N/A (Thermal Only) | Inverter for grid-tie PV. |
| Heat Pump (Water-Source) | $10k - $18k | $10k - $18k | $10k - $18k | |
| Mechanical BOS (Pumps, Pipes) | $7k - $15k | $7k - $15k | $7k - $15k | |
| Water Management System | $5k - $15k | $5k - $15k | $5k - $15k | Gutters, cistern, French drain. |
| Structure/Mounting/Foundation | $10k - $20k (Slab) | $2k - $7k (roof prep) | $25k - $50k+ (structure) | All structures utilize insulated concrete slabs. |
| Subtotal (Materials) | $54k - $107k | $46k - $94k | $67k - $138k+ | |
| OPEX (Annual Operational Exp.) | ~$300 - $1,000 | ~$300 - $1,000 | ~$200 - $700 |
| Phase | Stand-Alone PV/T | Integrated Roof PV/T | Greenhouse Thermal-Only | Notes |
|---|---|---|---|---|
| Design & Engineering | 40 - 80 hrs | 40 - 80 hrs | 80 - 160 hrs | Includes water management design. |
| Site Prep & Structural (Slab) | 60 - 100 hrs | 20 - 40 hrs | 150 - 300 hrs | Universal slab foundation implementation. |
| Water System Installation | 30 - 60 hrs | 30 - 60 hrs | 30 - 60 hrs | |
| Mechanical Installation (Pipes) | 50 - 90 hrs | 50 - 90 hrs | 80 - 140 hrs | |
| Electrical Installation | 40 - 80 hrs | 40 - 80 hrs | 10 - 20 hrs | |
| Commissioning & Testing | 20 - 40 hrs | 20 - 40 hrs | 30 - 50 hrs | |
| Total Estimated Hours | 240 - 450 hrs | 200 - 390 hrs | 380 - 730 hrs |