Hi there! Based on the search results, I'd recommend either the Ryobi 1200W Inverter Generator for R4859 or the Gentech 2KVA Inverter Generator for R8999 to power your Defy 385 refrigerator. As small inverter generators, they would be quiet and fuel efficient for occasional off-grid use. The Ryobi is more affordable, while the Gentech has a little more power capacity at 2000W which may allow you to run other small items alongside the fridge if needed. Both come with plugs suitable for South African outlets. Let me know if you need any other info to help you decide!