4 Divide system size (in watts) by panel wattage — typically 420W in 2026 Annual consumption: 10,200 kWh (from Alectra 12-month statement) Ontario specific yield (Mississauga): ~1,150 kWh/kW/year System size needed: 10,200 ÷ 1,150 = 8. 87 kW Panel wattage (Trina / Longi Tier-1): 420W.
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About 97% of solar panels quoted on the EnergySage Marketplace in the second half of 2025 are 400 to 460 watts—expect to see panel outputs in this range in your quotes. Your panels' actual output will depend on your roof's shading, orientation, and hours of sun exposure.
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Based on our calculations and real-world conditions, you would need approximately 18 solar panels, each rated at 300 watts, to sufficiently power your well pump while accounting for various efficiency losses. Understanding the energy needs of your water pump is critical.
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Using the same three 6 volt, 3. 0 amp panels from above, we can see that when these pv panels are connected together in series, the array will produce an output voltage of 18 Volts (6 + 6 + 6) at 3. 0 Amperes, giving 54 Watts (volts x amps) at full sun.
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