Solar panels are generally very reliable for charging electric vehicles at home. Solar panels can help bring down utility bills as well as your carbon footprint – allowing you to recharge your electric car using 100% free, renewable energy.
Solar panels are weather-tested to a high quality and tend to last anywhere between 25 and 40 years before repair or replacement becomes necessary. Since the lifespan of an average car is about 12 years, your home solar panels could theoretically recharge the next two to four electric cars you’ll own.
The ‘rate of degradation’ in the solar industry is the speed at which panels are expected to lose efficiency and power over time. Thankfully, quality modern solar arrays have extremely low degradation rates: just 0.2% to 0.3% per year. Even at a more conservative degradation rate of 0.5%, the average panel would still be operating at 87.5% power after 25 years of use.
The main factors that impact the reliability of solar panel technology and efficiencies over time are the quality of solar panel manufacturing and the installation, maintenance, the amount of sunshine they're exposed to, and adverse weather conditions.
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