Introduction
Solar panels have become an increasingly popular choice for maSwati wanting to gain some control over their energy supply. However, the performance of solar panels is not solely dependent on whether the sun is out or not; orientation of the panels plays a crucial role in optimizing energy production. In this guide, we’ll explore why the orientation of solar panels matters and how it can impact solar panel output. We’ll also touch on the significance of keeping the panel surface clean for optimal performance.
Solar Panel Orientation Towards the Sun
The key to harnessing this energy efficiently lies in the proper orientation of the panels relative to the sun’s path.
1. Direct Sunlight Exposure:
When solar panels face directly towards the sun, they receive maximum sunlight exposure. This occurs when the panels are angled to align with the sun’s path. In Eswatini this means, broadly speaking, facing the panel towards the north. This positioning allows panels to capture sunlight most effectively, maximizing energy production. However, this represents an average ideal. The ideal is to continually readjust so the panel is pointing directly at the sun, starting in the east, northerly by noon, and westward as the sun sinks below the horizon. Frequently adjusting the panel(s) may not be desirable (or possible, in the case of fixed mountings), so simply pointing northward represents the best average.
2. Solar Panel Misalignment:
If solar panels are not correctly oriented, their exposure to sunlight decreases. For instance, facing panels east in the afternoon, west in the morning or south at any time of day can result in lower performance that could be achieved on that day. This is because the panels won’t receive direct sunlight when it’s available. Chronic misalignment can significantly reduce the overall energy harvested by a solar power system in the long term. It doesn’t damage anything, it just means that you paid for system capacity that you are not benefitting from.
Please note that the question of orientation only matters when there is direct sunlight available. The day is completely overcast, then the light level is the same in every direction, so orientation is no longer a factor and performance will be reduced regardless. For this same reason it is very important to make sure that shade does not fall upon your solar panel(s) during the day (unless is it shadows cast by clouds, of course).
Example Scenario: Solar Panel Orientation in Southern Africa
Let’s consider an example to illustrate the impact of orientation on solar panel performance. Imagine you have a solar panel with a capacity of 300 watts, and you commit to adjusting its orientation throughout the day, perhaps every half hour. so that its misalignment is only ever slight.
When the solar panel is perfectly aligned with the sun, it might generate close to its maximum capacity, let’s say around 290-300 watts on a sunny summer day. Our summer days are roughly 12 hours of light, but lets assume only 10 hours of those are strong enough to generate meaningful power output. So, your 300 W panel will harvest around 2 – 3 kWh of energy during that day.
If, however, just put the panel outside facing any which way–pointing southerly, for example–the panel is facing away from the sun, so its output might drop by half (potentially even more if its in the shade) to around 150 watts, depending on the degree of misalignment.
After 10 hours of summer light the panel has only harvested about 1-1.5kWh at the end of the day, meaning that on that day you have lost out on up to 1.5kWh–enough to run a laptop for nearly the whole night.
Of course, in practice, it doesn’t make sense to adjust a solar panel’s orientation as your full time job. Pointing the panel in a northerly direction is enough to net a steady 60-80% of the performance under ideal (tracking) conditions, with much less effort.
This example highlights the substantial difference in energy production based on the orientation of the solar panel. Correct alignment is key to extracting the maximum potential from your solar power system.
How Important is Cleaning Solar Panels?
The cleanliness of the solar panel surface also plays a significant role in maintaining optimal efficiency.
Dust, bird droppings, and other debris can accumulate on the surface of solar panels over time. This accumulation creates a barrier between the sunlight and the photovoltaic cells, reducing the panel’s ability to convert sunlight into electricity. Even a thin layer of dirt can reduce the panel’s efficiency by blocking sunlight. Regular cleaning is essential to ensure that the panels operate at their highest capacity.
Conclusion
Small solar panels are extremely simple devices to operate, so in practice it’s hard to get it completely wrong. However if you are wondering how to maximise solar panel output there are simple steps you can take. Ensure that the panel (if not directly tracking the sun) is facing north, and try to keep its surface nice and clean. If you are considering grabbing your share of all that sunlight pouring onto the ground every day to power your life. visit the Electric Market. Let us help you get power, in your hands.