| http://www.w3.org/ns/prov#value | - For conventional silicon-based photovoltaic cells, there is little degradation, but with many new systems being developed ??? either for lower cost, higher efficiency, flexibility or other improved characteristics ??? the degradation can be very significant. ???Often people see, over 60 hours, the efficiency falling to 10 percent of what you initially saw,??? he says.
|
