In the summer, the best time to clean your solar panels is early in the morning or late in the evening when they are cool, as cleaning them during the hottest part of the day can cause thermal shock and potentially damage the panels due to the extreme temperature difference. 

Key points to remember:

• Avoid midday heat:The sun’s intense heat can make the panels very hot, increasing the risk of cracking the glass if you clean them at that time. 
• Cooler temperatures are best:Cleaning when the panels are at a moderate temperature, like early morning or late afternoon, is safer for the panels and for you. 
• Check for dirt accumulation:Even if you clean your panels regularly, check them periodically to see if they need cleaning, especially if you live in a dusty area