No. of Recommendations: 2
"I just wanted to let you (and others) know that my Solar City system finally went live last Friday, so it's been generating electrons"

Living in North Dakota, an evacuated tube heat collector with just enough PV to run the circulating pump would be more interesting. For those who don't know, evacuated tubes are so efficient they are using them at the south pole base where it is about 40 below in mid summer. Here we could use it in the winter for DHW and space heat, and in the summer use the space heat part to warm the ground under the house.

We got our attic > ground heat storage system running in late April. Water returning from the buried tube is 13 degF warmer than when first measured, so we are storing heat in the ground. The attic runs notably cooler, as much as 20 degF on a hot sunny afternoon. Given enough spare time, plans are to rig a hot water preheat and run the warmed water through that first, then through the buried tubes.

Douglas Hvistendahl

Dumb mistakes are irritating.
Smart mistakes go on forever,
unless you test your assumptions!
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