The main problem with this system were:

• The micro inverters were unreliable.
  • I had 2 micro-inverters replaced in full warranty period (no cost to me) within 3 years.
  • I had an additional 3 micro inverters replaced after 6 years (the micro-inverters were free issued, but I had to pay for installation).
  • Upon system replacement in April 2025 an additional 2 micro inverters had fully failed and 2 were not functioning correctly.
• The monitoring device that reported micro-inverter performance and power production was unreliable in communication with the micro-inverters and regularly had difficulties communications with the micro-inverters.
• The installer did not provide a micro inverters / panel installation map on initial installation. (This begs the question of how professional the installer was.) I did not identify the need for the map until a few weeks after the installation and was not expecting the system to be so unreliable that such need affected maintenance cost.)
• The system was not over provisioned. Basically 5kW of panels with 5kW of inverter capacity is not the most effective installation, particularly as solar panel pricing reduced. It is more cost effective to install excess solar panel capacity over invert capacity as this gives improved overall system performance including improved installed return on investment. Only in the 2 years of operation did I every briefly observe 5kW output. After this peak output was usually between 3 - 4.2kW, depending upon operational inverters.
• The micro-inverters with from AP Systems. Enphase is another major micro-inverter supplier that appears to be more premium. That being said the AP System installation clearly was sub-standard in terms of reliability. Whether or not an Enphase system would have performed better is unknown.

I calculated using actual conservative measure performance that the system payback was about 7 years, including maintenance cost.

I replaced this system with new solar cells and string inverter in April 2025. At this time the existing system performance was degraded, and configuration sub-optimal and unreliable, making overall replacement easier and more effective in the long term than maintenance of existing. Also battery storage systems were starting to become cost effective with offered government subsidies.