How Shading Can Limit Solar Efficiency

Why Is Solar Efficiency Important?

How Shading Can Limit Solar EfficiencySome solar power facts to help you understand what solar efficiency is, and why you need to know about it. Solar efficiency is considerably increased by using such a centralized energy management system. Solar efficiency is determined by climate, temperature, and technology, and solar efficiency is creeping up every year.

You may be wondering what solar efficiency is and why high-efficiency solar panels are better than low-efficiency panels. With its increased solar efficiency is designed for continuous use without culturing a pool full of mustard algae. Landscaped gardens and solar efficiency are also further appealing characteristics of this property

Solar efficiency is generally measured under optimum conditions with direct sunlight shining on the cell from the best angle.

Shading for Solar Heat Gain

Shades can keep the heat and glare of direct sun from coming through windows. They can also keep direct sunlight off of walls or roofs, to reduce cooling loads.

The most common form of shade is an exterior fixed horizontal overhang.  These are used on the side of the building facing the sun’s path, sometimes including east and west faces.  However, east and west faces often have more need of vertical fins to avoid low-angled sun.

The side of the building facing away from the equator needs no shading, except near the equator where the sun may be on the north or south side depending on the season.

There are many variations on fixed external shades, to reduce the profile and/or let more diffuse light in.  In hot climates, it can be especially useful to shade the building’s roof to avoid solar heat gain.  Rooftop solar panels, if placed right, can act as shades and thus perform double duty as energy generators and energy load reducers. Check more here.

The future for solar efficiency is thus bright, in theory, but materials costs and technical hurdles related to manufacturing intricate multi-junction cells may keep these advances from being fully realized for the time being.

Why even partial shading is bad for solar power systems

Why does shading have such a dramatic impact on energy production?

In most instances, solar photovoltaic (PV) systems for homes and businesses consist of solar panels (the collection of which is referred to as the ‘array’) and an inverter. The solar panels catch sunlight and convert it into DC (direct current) electricity, and the inverter in turn converts the DC electricity into grid- and appliance-compatible AC (alternating current) electricity.

Strategies and technologies for dealing with shaded solar panels

Although the performance and therefore the return on investment (ROI) from a solar power system can be severely affected by shading – especially shading that occurs regularly due to an object that casts a shadow at the same time every day as the sun passes through the sky – there are a number of ways to avoid or mitigate these effects.

Site your solar panel array where there will be no regular shading

This is the first and most obvious step to making sure your system does not suffer the consequences of being partially shaded. It is extremely important to consider all times of day for all seasons of the year when working out whether some nearby object might cast a shadow onto your roof. A solar system installer should be able to tell you if shading will be a problem using a range of mapping tools. Read more here.

Solar efficiency is decided by taking into account the maximum power (measured in watts), the maximum power voltage (measured in volts), maximum power current (measured in amps), the cell technology type, and finally the number of cells.

What Factors Determine Solar Panel Efficiency?

The efficiency of solar panels is influenced by a whole host of variables. The following are the most important ones:

Solar Panel Type

  • Monocrystalline solar panels are based on the highest-purity silicon available. This makes them the most efficient solar panel type available for homeowners.
  • Solar panels based on polycrystalline silicon are usually not quite as efficient as monocrystalline, but there is not that much of a difference.
  • Today`s thin-film solar panels are relatively inefficient, but they also cost less. Thin-film solar panels take up a lot more space than mono- or polycrystalline solar panels, which is why they are unsuited for most households.


Shade will obviously affect the output of solar panels. Depending on your setup, a little shade can even bring down an entire solar system. Micro-inverters offer a possible solution to shading issues. Professional solar panel installers will do a thorough analysis of shading in your specific situation.


For best efficiency, solar panels should be positioned to maximize the input of sunlight. This means that solar panels should be faced south in the U.S. Solar trackers were invented in order to adjust the orientation of solar panels to follow the sun`s trajectory throughout the day. For most homeowners, solar trackers do not pass a cost-benefit analysis – they are simply too expensive. See full article here.

Prospects For Improving Solar Efficiency Are Promising

One of the key limits to solar efficiency is the semiconductor bandgaps where excess solar energy is lost to heat instead of being converted to electric. Solar efficiency is among many other green features that make this home comfortable and affordable. Photovoltaic solar efficiency can be measured either by looking at solar cell- or at solar panel efficiency.

Three other important features which contribute to the passive solar efficiency are reflective roof design, super-insulation, and airtightness. Solar efficiency can be greatly compromised by dust and bird feces collecting on the panels. Greater solar efficiency can be achieved by adding more panels to the array or changing the Wattage output of the panels, call us here: (951) 805-1262.

Related Articles:
How To Build Your Own Green Energy System
The Best Angle For Your Rooftop Solar What You Must Know

Leave a Reply

Your email address will not be published. Required fields are marked *