Yes, solar panels operate based on light, not heat. Even on cloudy days, your panels can still generate electricity, albeit potentially at a reduced rate. Modern panels are designed to be efficient, even in less-than-optimal conditions.
Without batteries, your property would switch to using the National Grid’s electricity in the evening and through the night. It’s more efficient – and cost-effective – to charge batteries using solar power in the daylight and then switch to using stored battery power after sundown.

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