Quick Answer
Recommended solar panel sizing for well pumps is typically 10-20 watts per gallon per minute (GPM) of flow rate. This translates to 300-600 watts for a standard 3 GPM pump.
Determining Solar Panel Requirements
To determine the required solar panel size, you need to calculate the pump’s power requirements. This involves multiplying the flow rate (GPM) by the pump’s horsepower (HP) and then by 746 (to convert HP to watts). For example, a 3 GPM pump with 1 HP will require 2226 watts (3 GPM x 1 HP x 746).
Choosing the Right Inverter
A suitable inverter size is crucial to avoid electrical losses and ensure a stable power supply. A general rule of thumb is to choose an inverter with a rating 10-20% higher than the total system power. For our 600-watt example, a 660-720 watt inverter would be a suitable choice.
Additional Considerations
Other factors to consider when sizing solar panels for well pumps include battery bank capacity, charging time, and overall system efficiency. It’s essential to ensure that the solar panel array can fully recharge the battery bank within 8-10 hours to maintain a stable power supply. A well-planned and sized system will ensure efficient and reliable operation of the water well pump.
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