This calculator estimates the minimum **solar panel size** needed to support a portable ham radio setup based on your power needs and local sun availability.

It works by calculating the daily energy demand and dividing by the usable solar hours: \[ \text{Panel (W)} = \frac{P_{\text{load}} \times t_{\text{use}}}{t_{\text{sunlight}} \times \text{efficiency}} \] Where:

• Power Load = average power consumption in watts
• Usage Time = operating hours per day
• Sun Hours = usable solar insolation per day (varies by season/location)
• Efficiency = accounts for battery and charge controller losses

This is ideal for **POTA**, **SOTA**, off-grid shacks, or emergency setups. Always round up and consider weather or shading when sizing panels.