#### 20.4A computer engineer is designing a low-power sensor network for a smart agriculture field. Each sensor node consumes 0.8 watts per hour and operates 24 hours a day. If the system uses 15 nodes and the solar-powered battery bank must supply at least 120% of the total daily energy consumption, what is the minimum energy capacity (in watt-hours) the battery must have?

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### Why Smart Agriculture Sensors Are Reshaping Sustainable Farming In today’s push for smarter, more efficient farming, a quiet revolution is unfolding across U.S. fields: engineers are designing ultra-low-power sensor networks to monitor soil health, moisture, and crop conditions in real time. These tiny devices, spread across acres, rely on precise energy management to run 24/7—often with solar power—without frequent maintenance. With sustainability and cost-efficiency driving innovation, a key challenge emerges: how much energy storage is truly needed. This technology isn’t just for researchers—it’s already influencing how food is grown, watched, and distributed across America. The push for renewable-powered agriculture hinges on accurate energy calculations. Linear power demands and predictable usage help engineers size systems correctly, ensuring resilience even during low-sun periods. ### Why This Design Matters in Smart Agriculture