The exact number of solar panels you need to run a washing machine depends on various factors, such as the power capacity of the solar panels, the energy consumption of the washing machine, and the availability of sunlight.

A standard household washing machine usually has a power capacity of around 500-1500 watts. To make a rough estimate, let's assume an average power capacity of 1000 watts for a washing machine.

The power generated by solar panels varies, but a common power rating per solar panel is about 250-350 watts. To run a 1000-watt washing machine, you would need at least 3-4 solar panels with 250 watts each. The exact number can vary depending on the efficiency of the solar panels and the amount of sunlight available.

It's important to note that solar panels do not continuously produce their maximum power. The power can vary depending on factors such as the position of the sun, cloudiness, and shadows. Moreover, the energy consumption of the washing machine depends on the settings and the duration of the wash cycle.

It is advisable to consult a professional solar energy specialist to get an accurate estimate of the number of solar panels you need to run your specific washing machine, taking into account the specific conditions of your situation.