In 2007 Seager installed a 3kW peak system (about four metres by three metres) on the roof of his Victorian home in south London. It has produced about 2,700 kW hours (kWh) a year - enough for more than 80% of his annual electricity needs - and 15 years later is still going strong.
"They are supposed to degrade by about 0.5% a year but have not. I'd estimate they declined by no more than 0.25% a year," he says.
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