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When you are installing rooftop solar you must make sure your roof is in good condition and can take the weight of the installation. Solar panel weight on your roof If you were installing a 6 kilowatt solar array made of 20 panels, the panels alone will weigh in at approximately 800 pounds. The total area covered would be around 352 square feet.
Most homes in the UK can support solar panels without issue. According to the Energy Saving Trust, a residential solar PV system adds around 10–12kg per square metre to your roof. Given that UK building standards already account for much higher loads such as snow and wind, this weight is generally well within safe limits.
Commercial solar panels tend to be about a foot longer than residential solar panels at 6.5 feet by 3 feet and can weigh 50 pounds or more. The exact size of residential and commercial solar panels depends on the manufacturer and their specifications.
When you take into account the solar panels and all the mounting equipment, racking, junction boxes, and wiring, the total weight of the solar installation comes in at around 3-4 pounds per square foot (this does not include the inverter, which usually gets bolted to the wall).
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