Residential solar panels are usually sized between 3 kW and 8 kW and can cost anywhere from $7,500 to $28,000 in total installation costs. See average solar panel system costs by size (before tax credits or discounts).
The spacing of photovoltaic brackets is usually between 2. This is to ensure that the front and rear rows of brackets will not block each other's shadows, thereby ensuring the light utilization rate of photovoltaic modules.