I'm curious if I could minimize the surface area of a solar panel by attaching it to a secondary mirror of a telescope or a radar dish. Specifically, I want to know how much energy a small 5-inch solar reflector plate would gather when mounted on a larger 50-inch primary mirror, compared to using a standard flat solar panel that measures 50x50 inches. Would this setup be more efficient?
3 Answers
It's definitely an intriguing idea! While it's possible to focus light with mirrors, you'd have to consider the costs and practicalities. Generally, a tiny 5" plate just won't generate the power you’d expect like a standard panel would. It might only produce around 3.3 watts, while a typical flat panel can give you about 400 watts. So, you'd need a lot of those small plates to even rival a single standard panel.
Look into concentrated photovoltaics! They're a viable option, but you need special solar cells that can handle the intense power without overheating. Plus, keep in mind that as panels heat up, their output drops. So focusing more light on a smaller area could complicate things with heat dissipation. It might just be simpler to stick with regular panels.
You’re touching on a topic that sparks interest in the solar community! Current flat-plate PV panels, typically made of silicon, don’t do well with high concentrations of sunlight due to thermal issues. Multi-junction cells can handle concentrated light better but at a higher cost. A 50" mirror focusing onto a 5" receiver could in theory concentrate light effectively, but real-world efficiency declines due to losses from alignment and heat, making traditional flat panels still the more practical option.
That makes sense! It sounds like sticking to what works is the best bet for now.
Great point! I hadn’t thought about the overheating issue.