Explore halm's range of photovoltaic measurement products, including cell and module production testers, lab systems, and advanced analysis software.
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Enter your solar panel's voltage (Vmp), current (Imp), and the number of panels you're wiring together. Use this to match your inverter and battery requirements.
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Modern panels reach 18–23% efficiency. That means they convert about one-fifth of sunlight into usable power. But efficiency is only part of the story. Real-world performance changes with temperature, shading, tilt angle, and even the quality of the inverter or battery.
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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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