Based on your question about controllers and inverters for a 5kw solar system, here are a few top options from the PriceCheck search results: The Mksii 5KW Pure Sine Solar Inverter is available for R9995. As a pure sine wave inverter with 5000W maximum output, it would be well suited to power a 5kw solar system. The Deye 5KW 5KVA 5000w Hybrid Inverter looks like a great choice as well for R19399, as it can work both on solar energy as well as with a backup power source. The Corex Nava Solar 5KVA Inverter Kit which includes the inverter and lithium battery for R39400 would be a complete packaged solution. I hope these recommendations are helpful in your search for a solar inverter. Let me know if you need any other details!