Are you thinking of using solar power as a means of greening your life and lessening your carbon footprint? If you are considering the solar panels you want to use for power there are many aspects to take into consideration.
The price of solar panels is determined by its dimension (in Watts) and the physical dimensions of the panel, the manufacturer, the longevity or durability (or warranty duration) and any other certifications that the solar panel may have. Selecting pv solar panel in the UK solely based on price isn't prudent, since it might not be suitable for the space you'd like to place it and may not be equipped with the required certifications needed to be eligible for rebates from the government and may not come with the required warranty for an economic return on the power generated.
In addition, should you be aware that if the panel is going to be used in a vital system, you should not install a panel that isn't quite as durable as the other. Good solar panels warranty for 25 years.
The kind of solar cells that are used for its production will determine the dimension that the panel will be. The most important thing to think about is to ensure that your system is able to provide enough Watts to run your appliances and the solar panels physically fit into the area you'd like to place them.
Whatever technology is currently being used regardless of the technology currently in use, a solar panel operating in complete shade can only produce a tiny portion of its capacity.