ColdHubs are 100% solar-powered walk-in cold rooms, installed in outdoor markets and farm clusters. The Hubs are used by smallholder farmers, retailers and wholesalers to store and preserve fresh fruits, vegetables and other perishable foods 24/7, extending their shelf life from 2 days to 21 days. Each Hub is made up of: Cold room: a 10 feet length, 10 feet width and 7 feet height, 120mm insulated cold room panel with floor made of stainless steel. This contains 3 tons of perishable food arranged in 150 units, 20kg stackable plastic crates. Refrigeration unit: a high fluorocarbon (HFC) free and energy efficient monoblock refrigeration unit for 24/7 refrigeration, using 658 watts of energy per hour. The temperature is adjustable from -5 to +15° Celsius. Solar power: rooftop solar panels generating 5.5kw/h, connected to a set of deep-cycle, long lasting batteries, off grid and on grid inverters, runs the Hub in all weather.