Should You Wash Your Solar Panels? A Real-World Test

I tested whether cleaning my dusty solar panels was worthwhile by comparing power output between two banks. The results showed a 2%-5% increase in efficiency, translating to roughly £60-£150 in annual savings. While the cleaning effort seems justified, I also discovered a surprising safety quirk involving capacitive leakage and reflected on how old feed-in tariffs now discourage upgrading to modern, more efficient technology.