[bill1952]

... Mike Zwalley put a $65,000 solar energy system on his roof.
The system — a 30-gallon solar water heater and 44 black panels that convert sunlight into electricity — cut Zwalley's electric bill from $300 to $400 per month to $10 to $20.

The rest is tripe - this is the crux:

Pay $65,000 & save $300 per month - and I seriously doubt even that projection as it doesn't even address batteries and equipment maintence & repair - even if you believe all of it.

By their own numbers that is an 18 YEAR break even point

[muawiyah]

Only if treated as a single investment opportunity by a business. This is an individual and properly treated the ROI computation will be quite beneficial to him.

[USNBandit]

$65k seems like a lot of money, but I guess he needs a lot of capacity. He would be better off to not go solar and hope his neighbors trees grew tall enough to provide some shade.