IMO the subsidy is a rort and the industry is poorly regulated.
About 5 years ago, I had a 5KW system installed,18 panels. After the government subsidy (paid to the installer, not to me) cost to me was $3000.
Although I had a look online before using that company, I missed some shit. Such as they had been done by the ACCC for false advertising.
Anyway, the system worked splendidly for over 4 years. My electricity bills dropped by 30% annually.
Then the inverter broke. The most expensive single component. In keeping with SA consumer legislation, I tried to contact the vendor. They are in receivership . Managed to contact the makers of the inverter. No probs, they sent me a new one. Had a to pay a local company $120 to install it, for literally 15 minutes work . I was lucky; full cost of a new inverter was $1200
BUT having said all that, I do have pinko side: IMO amenities such as power, water, sewerage, and tele communications should be owned by we the people and run by government. Imo natural resources, such as oil, gas and minerals such as iron, copper, gold and diamonds belong to the nation and should be exploited under licence, with high taxes. No government has a right to sell or effectively sell such resources.
I worked for the federal government for most of my working life. I also have along memory. Over a lifetime I have become increasingly irritated by claims that government organisations are necessarily incompetent and inefficient. An exception seems to be the shower which Centrelink has become since I retired.