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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A range from 100 to 400 watts is generally considered appropriate for outdoor solar panels, depending on energy needs, location, and panel efficiency. Ideal wattage provides a balance between sufficient energy production and manageable installation and cost considerations.
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To charge a 48V 200Ah battery, you would typically need at least two to four solar panels rated at around 300W each, depending on sunlight availability and charging time requirements. This setup would provide sufficient energy to fully charge the battery in a day under ideal.
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For 500W of continuous power, you need panels that can produce 2,500Wh+ daily (500W × 5 hours). With system losses and variable sun, 400-500W of panels is ideal.
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