American solar installer companies do seem to charge way more than European or British ones. I got 3.9kW installed almost ten years ago for just £5500, including all the paperwork for feed-in-tariffs. It has long since paid for itself just in subsidy, let alone actual consumption.
In general, contractor overhead in America is obscene, compared to Europe. We have a lot of regularly capture working to keep it that way, too.
> American solar installer companies do seem to charge way more than European or British ones
One of the reasons for this is that in many parts of the US, solar has sadly been market segmented as a luxury product, just like other high efficiency products like heat pumps or EVs.
This is enabled by both the prevailing cultural attitudes about efficiency and renewables as indulgences for the better off, and industries that are happy to keep captive high margin markets of those customers, i.e. the continued lack of a US produced low-cost EV.
The American cult of individualism is also at play, wherein collective solutions are shunned vs private ones, which is why renewables and storage are so popular among off grid libertarian types.
We had 18x510w panels (9.2kw), 2xZappi chargers, PW3 & Eddi (to heat hotwater) installed ~5 weeks ago. Total cost was £17k (inc. scaffolding, cert, etc), in the SE England, with a small recommended contractor. The UK solar market is full of rogues as well, charging massive sums, many for pretty questionable systems. We had 5 quotes to get there, 3 of which were crazy in one way or another.
We hit our first MW/h of power today. In England. In April. Total electricity bill for the last 6 weeks is about £30, and that includes our driving (previously £150 to £200 p/m) and most of our hot water. If you have the property for it and available investment, the ongoing savings are instant and obvious! My instant regret was not having done it sooner. Driving around on your own sunshine does feel magical as well!