To make up a 3kW solar system you need 12 solar panels, assuming that you use 250W panels. Each 250W panel will be about 1.6m x 1m, so you’ll need at least 20m2 of roof space.
Chway 5kW solar panel system generates about 20 kWh - 25 kWh on a good day with sunshine and around 4,500 kWh of electricity is generated throughout the year. The 5kW solar system is made up of 20 solar panels, assuming that the panels have 250-watt capacity.
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