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I thought panels had a 20 or 25 year life span with reduced wattage each year. Is that true? How old are the panels you bought?
by TedDoesntTalk 5y ago
I thought panels had a 20 or 25 year life span with reduced wattage each year. Is that true? How old are the panels you bought?
- bserge 5y ago25 years until they drop below 80% efficiency afaik (newer ones are even better). But 80% is still rather decent for home use especially if you have space for more of them. Buy dirt cheap, use for another 10-20 years.
- jeffbee 5y agoModern panels lose less than ½% per year. If you bought 20-year-old panels today you should expect to get 90% of their nameplate capacity still. https://www.nrel.gov/docs/fy12osti/51664.pdf https://www.nrel.gov/docs/fy12osti/51664.pdf