2010
PRINCE GEORGE, BC SOLAR HOT WATER HEATING
Apricus evacuated tube SDHW collector (Two 30-tube collectors)

Sun Data Water Heating
2010 Monthly
Peak Sun
Hours		 Daily
Peak Sun
Hours		 Electric
Backup
kWh		 Solar
Heater
kWh		 Solar
% of Total		 Notes
Jan 38 1.23 no data 178 - measurement error
Feb 34 1.23 70 191 73.0%
Mar 117 3.76 29 587 95.0%
Apr 161 5.38 25 748 97.0%
May 182 5.88 3 967 99.7%
Jun 178 5.93 0 768 100.0% fewer consecutive cloudy days than in May
Jul 214 6.89 0 685 100.0%
Aug 153 4.92 0 556 100.0% reduced sun due to forest fire smoke
Sep 120
 3.99
 52
 382
 88.0%
 autumn rain storms started
Oct 71
 2.28
 37
 276
 88.1%
Nov 41
 1.38
 65
 202
 75.8%
Dec 30
 .96
 75
 132
 63.7%
Jan 2011
 32
 1.02
 87
 108
 87.6%
 12 month average using Jan 2011 data to replace the missing Jan 2010 data

2010 Seasonal Average Peak Sun Hours


Season Monthly Daily


Spring (Mar, Apr, May) 153 5.1


Summer (Jun, Jul, Aug) 181 6.0


Autumn (Sep, Oct, Nov) 77
 2.6


Winter (Dec, Jan, Feb) 102
 3.4


Annual Average 129
 4.3


2010 Apricus Monthly & Annual Summary

 Collector ēC Tank Bottom
ēC		 Tank Top
ēC		 Hx Return
ēC		 Pump
Run
Hours		 Heat
Collected
Kwh		 Heat (Kwh) Collected per Run-Hour

Min Max Min Max Min Max Min Max
Jan -30.3 66.4 14.7 57.9 19.9 65.4 18.0 59.6 71 178 2.5
Feb -11.0 73.2 13.7 62.6 21.0 69.1 21.0 66.2 83 182 2.2
Mar -10.6 90.3 18.7 78.4 28.0 87.3 22.3 84.3 220 587 2.7
Apr -8.2 85.2 20.4 70.7 32.9 79.1 21.4 76.4 271 749 2.8
May -5.6 87.8 23.7 72.2 35.6 80.6 21.6 78.3 360 971 2.7
Jun 1.4 92.4 23.1 76.1 34.7 85.3 22.6 86.2 378 768 2.0
Jul 0.3 93.1 29.9 76.6 39.8 86.2 23.8 87.2 420 673 1.6
Aug 2.0 89.6 24.8 73.0 37.0 82.4 24.6 83.5 320 556 1.7
Sep -4.6 84.7 23.2 69.5 30.3 78.0 20.0 79.1 224 382 1.7
Oct -5.8 80.0 18.7 65.9 23.7 73.4 20.4 74.3 135 276 2.0
Nov -32.2 64.2 16.4 52.8 24.3 58.2 18.0 59.5 92 202 2.2
Dec -23.0 52.0 14.2 41.3 21.0 45.0 21.0 46.0 52 132 2.5












Annual -32.2 93.1 13.7 78.4 19.9 87.3 18.0 87.2 2,626 5,655
Average







218.8 471.2 2.2










The collector minimum temperature is approximately the overnight low temperature. As you can see, here in the valley, even when daytime highs are in the +30's, it cools off very well at night.
The steep 68° mounting angle maximizes winter production and reduces summer over-heating.