A single 5kW solar installation can reduce diesel consumption by 1,800 liters annually – equivalent to planting 100 trees! Pro Tip: The optimal tilt angle for Cook Islands installations ranges between 12°-15° – significantly different from mainland configurations!A single 5kW solar installation can reduce diesel consumption by 1,800 liters annually – equivalent to planting 100 trees! Pro Tip: The optimal tilt angle for Cook Islands installations ranges between 12°-15° – significantly different from mainland configurations!.