There is an old expression: "It takes a large fortune, to make a small fortune, in the wine business".
Sunday afternoon I had a bit of time after work. So I visited a few "solar wineries" along the Silverado Trail close to Calistoga. Casa Nuestra is a less pretentious winery. It has a hippy, more simple flavor about it.
They have have a bank of panels to provide their electricity. 141 of them. 167 watts each.