PRINCE GEORGE, BC SOLAR HOT WATER HEATING Two Enerworks Flat Plate SDHW collectors
Energy Used					Hot Water Used
Date Meter Read	Last 31 days (kWh)	Gas Backup (kWh)	Solar Fraction (%)		Last 31 days (Liters)
2010 06 24	146.1	no data			3,031
2010 07 21	112.8	no data
2010 08 19	119.7	352.1	25.4%		2,742
2010 09 23	89.74	834.9	9.7%		3,314
Lifetime Totals	1,337				45,200
(since August 2009)
This system does not have a data logger so collecting this data is inconvenient at best and in reality, accurate data collection is next to impossible.
The backup to the solar water heater is a gas fired boiler feeding an indirectly heated tank. This is inefficient in the summer because the entire home heating system has to be brought up to temperature just to top-off the hot water tank. The Enerworks flat plate collectors are capable of providing a higher solar fraction when they are part of a more efficient system.
The percentage of hot water provided by the solar system (solar fraction) can only be calculated in the summer when there is no heat requirement in the house.
The solar controller data and the gas meter readings were not taken on the same day so this data is close but not exact.
Gas meter readings are converted to kWh as follows: M3 * .0362139 = gigajoules GJ * 277.7777778 = kWh