a quick summary of our experience, with a very arrogant solar seller, who spends a fortune advertising on TV who sponsored some dodgy afl club & seem to have phoenixed into another company but with almost identical ads.
We had the basic 1.5kw system installed on 2 houses in similar location, within days of each other. Paid $1500 each. Came with a 5 year warranty. At about 3 years, both invertors stopped turning on in the am, but found out by turning off system for a minute, the relay which seem to be at fault, kicked in. Called dodgy bros solar & same guy came to both houses & almost secretly pulled cover off invertor, while I was trying to watch & flicked something (a switch ?). He didn't want me to see & wouldn't tell me what he'd done. It took about 5 seconds.
Anyway, 2 years later noticed the same thing happened on both invertors. Called dodgy bros solar again & they said sorry out of warranty now. New invertors $2k each. After telling them to f..k off, I kept turning on invertors everyday, but also asked a auto electrician, what a new invertor should cost. He said " a good german one, not a cheap chinese one" $700 cash.
Kept turning them on manually & after a few months noticed they were both working again.
We get around $200-$250 off our 1/4ly power bill, depending on time of year. Our total power bills are $300-$350 a 1/4, so we end up paying around $100 to $150 a 1/4 to power co.
On a purely financial basis, systems paid themselves off after 2 years.
Both invertors are on 1 side of roof only & only get sun for 4-5 hours a day.
Get the impression, that many people looking at getting solar, don't factor in, how long the system will last or work for, maintenance & is the warranty given, worth anything.
PS. some of our neighbours trees starting to grow in front of solar system, so cut them back. They complained, so next time, I just poisoned the trees with poison I got from a farmer that kills everything.