Your panel's 15W rating represents ideal laboratory conditions. In reality, three critical factors determine daily energy harvest: Daily Watt-hours = Panel Wattage × Sun Hours × Efficiency Factor 15W × 4h × 0. 75 = 45Wh/day Enough to charge a 10,000mAh power bank twice!.
[PDF Version]
The optimal tilt angle is calculated by adding 15 degrees to your latitude in winter and subtracting 15 degrees from your latitude in summer.
[PDF Version]
Most utility-scale projects hover between 10%-20% storage capacity relative to solar generation. But wait - that's like saying "add some sugar" without specifying teaspoons! China's Solar Energy Co. nailed it with a 15% storage ratio across 20 projects.
[PDF Version]
Generally, it's recommended to size the inverter to 80-100% of the DC system's rated capacity.
[PDF Version]
