A 1kW solar system has 6 panels – perfect for smaller houses. Each panel measures around 1.6m x 1m, so you’ll need at least 10m2 of roof space. On average, a 1kW solar system generates 6.60 units per day. For the average household, this is enough for a third of your energy use. But if your home is highly energy efficient, a 1kW system can offset all your energy usage.