What are the 20% rules of solar panels?

What are the 20% rules of solar panels?

The "20% Rule" of solar panels is basically a design guideline that recommends installing a solar panel system with 20% more power than your normal electricity consumption. This acts as a backup during cloudy days, seasonal changes, or during excess electricity use.

Here are some important rules for installing and maintaining solar panels:

1. Choosing the right location

*Shadow-free location: Install the panels in a place where there is no shadow from tree branches, buildings, or anything else.

*South-facing location: In the northern hemisphere, including Bangladesh or India, solar panels should always be installed facing southwest (tilted slightly to the south).

2. Panel Angle

*The degree to which the panel is installed depends on your geographical latitude or season. Usually, the panel is tilted at an angle of approximately 15 to 30 degrees, so that direct sunlight is available.

3. Correct Sizing (20% Rule)

*If your home load is 1000 watt-hours per day, then the panel capacity should be designed in such a way that it can generate 1200 watt-hours of electricity. This extra 20% will help you get uninterrupted power at any time of the year.

4. Battery and Inverter Compatibility

*Use the right size solar charge controller (PWM or MPPT) for your solar system.

*Select the right inverter and panels according to the size of the battery.

5. Maintenance and Cleaning

Dust, bird droppings, or leaves on the solar panels reduce the power generation capacity. So, clean the panels with a dry cloth or water at least once a month or as needed.

*Regularly check the panel wires and connections for looseness.

*It is best to consult a local solar expert to verify whether the solar panel system will be most effective for you.

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-SZK