The first step in choosing solar panels is to assess their long-term performance

SunPower modules from Maxeon Solar Technologies are the latest technology in home solar, ensuring end users get better value from their system over time:

powerful energy production/high durability/guarantee of 25 years (class-leading)

  • unique cell architecture, which makes them more receptive to blue light -typical during cloud cover- and red light -which occurs at the beginning or end of the day-
  • cell efficiency, which maximises the watts installed on the roof, producing more energy in the same area as conventional panels
  • unparalleled reliability, maintaining a 2-3 times power advantage over conventional panels
  • outperforms the competition in heat, humidity and even temperature changes over time

Want to know how much you will save? Don’t just think about watts!

It is the efficiency of the solar energy that influences your savings, some panels will produce more energy even if their power is the same

This is because each panel behaves differently in real-world conditions, such as the amount of daylight, cloud cover, temperature and shade, and these differences make a big difference to your savings.

To understand how much power your system will actually create, it is useful to understand how energy is measured (kWh vs kWp).

The energy used by your home is measured in kWh (a unit of measurement that you also see on your bill).

The power of the system (when, for example, you receive an economic offer from an installer) is measured in kWp and corresponds to the highest amount of power your solar system can produce under “standard test conditions” (STC). What do these conditions look like? The panel is in a laboratory simulating a perfectly clear, windless afternoon sun directly over the panels, all at controlled, cool temperatures (25°C); you are unlikely to have such conditions on your roof in the real world.

Therefore, this STC rating does not represent the amount of energy your panel generates from your roof. Your location, the angle of installation and the technology you have chosen influence your panel’s power output and energy yield.

Some panels will produce more energy even if their power values are the same: it depends on the solar energy efficiency because panels behave differently in real-world conditions. Some panels have a higher solar energy efficiency than other panels.

It would be like comparing two light bulbs according to watts instead of brightness.

As technology has evolved, we have learned that LED bulbs can be more than 10 times brighter than traditional incandescent bulbs even with the same 25 watts of rated power consumption. So is one more valuable for its higher light output per watt of power? I would say so!

Like these bulbs, the technology of two 400 W solar panels can produce very different actual results. And in the case of solar panels, these results have an effect on your long-term return on investment.