Free plan offers 1,000 API calls daily with pay-as-you-call pricing. Professional collections include Current & Forecasts, Historical data, and Maps. Enterprise license provides all forecast products and current state
Thermal radiation is electromagnetic energy emitted by matter above absolute zero. Most radiation at room temperature is in infrared spectrum. Above 525°C, matter becomes visible through incandescence. Thermal radiation is one of three main heat transfer mechanisms
Kilowatt hours (kWh) = (Watts × hours) ÷ 1000. Watts to kilowatt hours conversion: (kWh ÷ hours) × 1000
Sunlight consists of infrared, visible, and ultraviolet light. Global average sunlight reaches Earth at 164-340 watts per square meter. Sunlight takes 8.3 minutes to reach Earth from Sun's surface. Sunlight spectrum spans 100 nm to 1 mm wavelength range
Water splitting converts water into oxygen and hydrogen through chemical reactions. Photosynthesis performs water splitting but doesn't produce hydrogen. Hydrogen fuel cells are based on the reverse process
Requires 4+ hours of sunlight daily for optimal performance. Three types: monocrystalline (20% efficiency), polycrystalline (16%), thin film (7-13%). Installation costs around $20,000 upfront. Can be installed by homeowners or professional contractors