BBM

Install this it will save your Axpert & any off grid inverter. One must remember that the Deye & Sunsynk are grid interactive and they have a 60s delay when the grid returns that will wait for grid stabilisation. The Off grid inverters don't have this function. I have fitted this device to all the Off grid inverter setups & it will save your machines main board because it waits 30s before the AC input is restored. 
This device costs in the region of R400 odd bucks. If it saves a main board worth R1000s of bucks then I think it's worth it. 

But we can push hard against such incompetence & lack of understanding given the correct time & place. The conversation has already started. This may be a small forum of 25K odd of ppl but, the voice of reason often is small. Through Associations like AREP or even individually one must oppose such stupidity. 
Solar is not a one size fits all model. The problem of unsafe & non compliant Installations is not an inverter problem. It's an installation installer & Industry problem. But your point is very valid. Many that don't know don't care. Just glad in this case I don't live in CPT. Very frustrating rules on solar.