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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Total installed: $18,000-$22,000. Assumptions: region, specs, labor hours. The numbers reflect wholesale-to-installer pathways; consumer quotes may differ due to dealer margins. Wholesale panel costs: $0.
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A DIY solar heating system refers to a homemade setup that uses solar energy to heat homes, water, or other spaces.
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Maxeon offers the best solar panels based on our analysis, followed by REC, Canadian Solar, Silfab Solar, and CW Energy.
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