Solar module efficiency
Always look at the efficiency of the total solar module, not only of the individual solar cell and be aware that high efficiency degrees are nothing without a high minimum warranted Solar Panels Worcestershire power rating. (see next paragraph)
Solar module power rating
It tells you about the wattage of the particular Solar Panels West Midlands module. Make sure to check the (warranted) minimum power since the maximum power, stated in Peak Watt (Wp), is always measured under standard test conditions (STC). As you know, nature is not a laboratory. It provides real live conditions and they can differ surprisingly in many ways.
Operation voltage
Open circuit voltage, stated in Volts (V), is the maximum voltage a Solar Panels Birmingham produces when illuminated and not connected to a load. The hotter the Solar Panels get, the lower the open circuit voltage gets.
Temperature operating range (TOR)
As mentioned above, operation voltage decreases with increasing temperatures. Make sure the TOR suits your local climate conditions.
Construction
Consider that you are purchasing a fragile high tech product that may be installed on your rooftop and should be be able to withstand roasting sun as well as wind, hail and heavy snow loads. Choose the right mounting system. Medium duty is good, heavy duty is better. The best solar panels are useless when blown down the roof and crashed on the ground.
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