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I heard that with latest solar panels we can convert 30% light to electricity;

• nomercy400 10y ago
  They can get a bit higher I believe (40%) in small sizes, so a trick that is also applied is focussing all the sunlight in that small area, to improve conversion rate. There is still a thing called heat, making it a bit more complicated.
• Brakenshire 10y ago
  You can get to much higher efficiency, but it involves very expensive manufacturing techniques which make the final cost much higher per unit of electricity. IIRC price-competitive silicon panels are now somewhere about 18-23% efficient, CdTe panels somewhat less.