Solar power in cloudy regions — is it still viable?

Assessing Cloud Cover

Cloudy regions can receive less direct sunlight, reducing the efficiency of solar panels. However, modern solar panels can still generate electricity even on cloudy days, albeit at a lower rate. A general rule of thumb is to increase the solar panel array size by 10-20% to account for reduced energy production in cloudy conditions. For example, if a typical solar panel array for a tiny home in a sunny region would be 6-8 kilowatts, in a cloudy region, it may be necessary to install an 8-10 kilowatt array to ensure adequate energy production.

Panel Efficiency and Angle

To maximize energy production in cloudy regions, it’s essential to select solar panels with high efficiency ratings (at least 20%). Additionally, the angle and orientation of the solar panel array can significantly impact energy production. Ideally, the panels should face south and be angled at around 30-40 degrees to maximize exposure to indirect sunlight. A south-facing array can also be designed to capture both direct and indirect sunlight, increasing overall energy production.

Battery Bank and Energy Storage

To ensure a stable energy supply in cloudy regions, it’s crucial to pair the solar panel array with an adequate battery bank and energy storage system. A typical battery bank for a tiny home might consist of 12-24 deep cycle batteries with a combined capacity of 10-20 kilowatt-hours. This will allow the system to store excess energy generated during periods of high sunlight and release it when needed, reducing the impact of cloudy conditions on overall energy production.