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RE: Research on how to reduce the sizes of Solar panel
Yes, you are right.
If a solar panel was 100% efficient it would generate 1000 watts per square meter. Typically solar panels are around 20% efficient so they only produce 200 Watts per square meter.
Getting this up to 35% is possible (and has been done in labs) but the technology costs too much to be commercial at the moment.
Yes,technology cost is too much