In short, yes. Solar panels still work on cloudy days and can still be used to recharge your EV. Solar panel technology is improving at a rapid rate and does not require direct sunlight to generate electricity but can instead still provide your home EV charger with free, renewable energy from diffuse light alone.
Still, it’s important to note that solar panel efficiency is greatly reduced in cloudy conditions.
Under light cloud cover, your solar EV charging system will produce around 76% of its maximum potential electricity. In these conditions, an EV recharge which would typically take two hours would instead take two and a half.
Under heavy cloud cover, solar panels produce just 33% of their potential output. Recharging the same EV under these conditions could take three hours and twenty minutes.
Under heavy rain, solar panel output may be reduced even further, to around just 10-20%, making a two-hour recharge under sunny conditions take around three hours and thirty-six minutes to three hours and forty-eight minutes.
It is possible that under such unfavorable conditions your solar EV charging setup would not produce the amount of electricity required to fully recharge your EV battery. Battery storage systems can be installed to help overcome these challenges.
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