Monday, December 19, 2011

Metering comment

18 Dec 2011: With just two weeks to the start of the Olympic year of 2012, the house and GSHP meters have been breaking records almost every week of the year. The figures remain remarkably close, with only about 5kWh variation on a 2,000 kWh difference. A year ago the two figures were over 6,000 and 4,000 respectively, then recently they were down to 5,000 and 3,000 respectively, and this week they are down to 4,800 and 2,800 respectively. If current weekly consumption continues, the figures will continue moving towards 4,700 and 2,700 respectively. Next spring, we should see a levelling out or an upward bounce if the weather gets colder.
The PV meter. This has just passed the 7,000kWh mark
just 27.5 months after installing
   So far, it hasn't been cold enough to need more heat in the evenings than a little top up heat with the pilot light on the gas fire in the evenings (to keep Mrs N-C happy.)

Mind the Gap!
This gap of 2,000 kWh does not mean that we use precisely 2,000 kWh for cooking, lighting power.  The GSHP meter is an absolute measured amount going to the GSHP, whereas the House meter has days of stasis due to the PV roof in the summer, sending reverse current through the meter. The amount that we are using is perhaps 60% of the PV generated, so as we generate 3,300 kWh, 1,320 is exported and 1,980 is used, so our House meter annual total would be perhaps 5,000 + 1,980 = 6,980 kWh. That still compares well with the regular amount of 8,500kWh/annum that we were using in 2007 and 2008.

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