[Xringer]

It's been running for 62 days now and the power use has been 60.21 kWh.
That seems a little low, but it's what the meter is displaying tonight.

$9.83 (@ $00.1633 / kWh) isn't much when compared to what I would
have used burning 1/2 gallon of oil every day. (approx $124).

We've only had one problem. The GFI (built into the A7 plug) popped out
and we ended up with a lukewarm tank. Might have been caused by a grid failure.

Tonight after a couple of long showers, the A7 seemed to be taking more time to recover.
I went down to check on it and found the area was at 61 °F. Outdoor temp is currently 60.4°F.
The A7 needs more time (and power) when it's cooler..

I'm going to reset the power meter tonight (it's after midnight),
and start a new 'winter' measurement cycle today, 10/3/2012.

Edit:
The pre-heat water (from 800w of PV) isn't very warm today, since it's been overcast a lot lately.
So, when the old HS Tarm boiler is down at 66F (normally it's above 75F),
the 40 gallon A7 tank is going to drop below the set-point quicker and stay below longer.