Calculate how many solar panels you need for your desired kW system size
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For a 5kW system using 400W panels, you would need approximately 13 panels. The exact number depends on your panel wattage — divide 5000W by the wattage of each panel to get the total count.
Divide your desired system size in watts by the wattage of each individual panel. For example, a 10kW system (10,000W) divided by 400W panels equals 25 panels. Round up to ensure you meet your energy target.
A 10kW system typically requires 20 panels at 500W each, 25 panels at 400W each, or 34 panels at 300W each. Higher wattage panels mean fewer panels needed, which saves roof space and installation costs.