To build a scalable solar power system for refrigeration needs, calculate daily power consumption. A side-by-side fridge/freezer uses 12 amps/hr (24 amps/day) and a freezer uses 9 amps/hr (18 amps/day), totaling 42 amps/day. Add a 50% buffer for two days of autonomy, requiring 200 AH battery capacity. Use deep-cycle batteries (e.g., 12V 100 AH) wired in parallel. Select a 30-amp charge controller, 2000W modified sine wave inverter, and 100W solar panels. Wire with 4/8-gauge cables, include a 200A fuse, and use a dual power post. Phase I costs ~$509, with upgrades like higher-capacity batteries and advanced charge controllers (e.g., TriStar TS-45) for Phase II. Avoid over-reliance on low-cost systems like Harbor Freight’s 45W panels for heavy loads.

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