October's PerformanceWith October done we now have a second month of data from the Solar Domestic Hot Water monitoring project. In September we had relatively good performance with 41% of the water heating needs supplied by the solar panel. October on the other had great sun for about a week mid-month, but then was much cloudier, shorter days and substantively lower performance. Here is both September and October's graphs so you can compare the two months:
Again, a few observations:
- Total energy used this month for hot water heating was up 79 kWh to 356 kWh of energy put into the heating of hot water. Of this only 15%, or 52 kWh was solar supplied. The higher energy use this month could possibly be explained because the basement is heated off of the hot water system. I did observe that the basement's infloor heating system was running periodically to supply heat to the basement.
- The amount of solar heat collected this month was again lower than modelled (52 kWh vs. 80 kWh modelled). Also, as a percentage, the solar fraction as only 15% which was slightly lower than predicted at 16%.
- The total amount of energy actually delivered as hot water was about the same as last month: 131 kWh. September was 127 kWh, so it looks like hot water usage was consistent with last month.