Yes, it can be more economical to do laundry during the day using solar panels. Solar panels generate energy from sunlight, which means they produce the most electricity during daylight hours when the sun is shining. If you run your washing machine at that time, you can take advantage of the free, sustainable energy your solar panels generate.

By using your washing machine during the day, you can reduce your electricity consumption during the hours when your solar panels are producing the most energy. This limits the use of electricity from the power grid and can potentially save you money on your energy bill. The exact amount of savings depends on the capacity of your solar panels, the amount of energy generated, and your own energy consumption.

Additionally, smart devices and smart energy management systems are now available that can help you optimize the energy consumption of your washing machine. These systems can automatically turn on your washing machine when your solar panels produce enough energy and schedule the wash cycle based on the available solar energy. This way, you can take even more advantage of your solar power.

It's important to note that the exact savings can vary depending on your specific situation, such as the size and efficiency of your solar panels, the capacity of your home battery (if applicable), and your own energy usage pattern. It is advisable to monitor your energy consumption and the energy production of your solar panels to gain a better understanding of the potential savings.