Photovoltaic compare

A 20 Watt crystalline silicon photovoltaic from 1998 vs 3 layer amorphous from Uni-Solar. Under dense clouds, the crystalline PV has no chance.

Datum
Weather
Battery voltage
Crystall-
lines
Silicon
0,2m²
20 WP		VOC
Charge current
Yield per m²
% peak power
Uni
Solar
0,5m²
34 WP		VOC
Charge currend
Yield pro m²
% peak power
2005-12-06 09:00 2005-12-06 12:00 2005-12-07 09:00 2005-12-07 12:00 2005-12-08 09:00 2005-12-08 12:00 2006-03-14 09:00 2006-03-14 12:00
Solar power despite snowfall While the crystalline modul delivers even not enough voltage delivers the Three layer amorphous from Unisolar still 32,6 mA charge current. 398 mW from 0,5m².

Dense clouds,
Snowfall 		12 noon in december The snowfall has changed to rain. For the human eye as dark as 3 hours berore, but Canon S1 and the Voltmeter show an evident increase.

Dense clouds
Rain 		Cloudy but brighter December 7th 2005 in Gartenau. Between the clouds is a part of the Untersberg visible. Maybe a little brighter than yesterday. Measurement shows even brighter than yesterday at noon.

Dense clouds 		Dusky or dusky? Difference 1.8 Subjectively, it's as dusky as yesterday. But the electric power yield shows between dusky yesterday 9:00 and today 12:00 is an 1:8 difference.

Dense clouds 		Morning sun behind stratus Blue sky, over the near hill is some stratus. Subjectively is the weather much brighter than yesterday at 9:00am. But objectively, it was yesterday at the same time brighter.

Blue sky
Sun behind stratus 		Winter sun behind light clouds Only 19 degree above the horizont is the sun behind light clouds. At horizontal photovoltaic, this brings only double compared to yesterday noon under clouds.

blue sky
Sun behind
light clouds 		Snowfall in March March 14th 9:00 am. The Untersberg behind the houses is not visible because of dense stratus. Light snowfall. Nevertheless surprising much electric power compared to December.

Snowfall
in March 		Sun instead of wood One day after the news about the pellets shortage, measurements at 9 and 12 am. How much solar energy at this cloudy March 14th? Who is more secure.

Sun behind
clouds
12,2 V 12,2 V 12,3 V 12,3 V 12,2 V 12,5 V 11.1 V 12.2 V
10,5 V 13,5 V 16,1 V 17,2 V 15,3 V 19,8 V 19,7 V 20,1 V
0 mA 9,1 mA 34,5 mA 84,5 mA 26,8 mA 200 mA 168 mA 360 mA
0 W 0,555 W 2,221 W 5,197 W 1,635 W 12,500 W 9,324 W 21,96 W
0 % 0,55 % 2,12 % 5,20 % 1,64 % 12,5 % 9,32 % 22,0 %
22,1 V 22,3 V 23,1 V 23,9 V 24,0 V 25,6 V 26,0 V 25,3 V
32,6 mA 85,5 mA 124 mA 260 mA 104 mA 520 mA 420 mA 780 mA
0,795 W 2,076 W 3,050 W 6,396 W 2,538 W 13,000 W 9,324 W 19,03 W
1,17 % 3,07 % 4,49 % 9,41 % 3,73 % 19,1 % 13,7 % 28,0 %
index: 2005 2005 
Index: Photovoltaic - Electric power direct from light Photovoltaic 


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