Quick Answer
A 100-watt solar panel is unlikely to power a well pump, as it would require a significant amount of time to recharge the system each day, and may not provide enough power to meet the pump's needs.
Calculating Power Needs for Well Pumps
To determine if a solar panel can power a well pump, we need to calculate the pump’s power requirements. The power needed depends on the pump’s type, flow rate, and head pressure. A typical submersible pump might require 200-500 watts, while a surface pump might need 500-1000 watts.
Sizing a Solar System for a Well Pump
When sizing a solar system for a well pump, we need to consider the pump’s power requirements, the number of hours of operation per day, and the system’s efficiency. A general rule of thumb is to size the solar panel array to provide 20-50% more power than the pump’s requirements to account for losses and inefficiencies. For example, if the pump requires 300 watts, we might size the solar panel array to 360-450 watts.
Battery Backup for Water Access
Battery backup is essential for well pumps, as it allows the system to continue operating during periods of low sunlight or at night. The battery bank should be sized to provide at least 12 hours of backup power, and should be charged by the solar panel array during the day. A typical battery bank for a well pump might consist of 12-24 6V deep-cycle batteries connected in series and parallel to provide 24V and 200-400 Ah of capacity. The battery bank should be monitored and maintained regularly to ensure optimal performance and longevity.
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