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PV system statistics 2000

Tables: Power generated in 2000 by my PV system in kiloWatthours.

The tables below contain the energy delivered by my two solar systems: Solar2900 is a 2900 Watt-peak array connected to a Sunmaster 2500 inverter. (installed March 11, 1999) The Solar100 energy comes from two 53 Watt modules connected to a Sunmaster 150 (installed end June 1999). This column may be used as a reference for a 100 Watt AC panel, a standard component used in the Solaris project from Greenpeace. Simply multiply the value in the column with the number of 100 Watt panels you have and see if your energy compares to mine. The location of this system is Postal code 7546, Enschede in the Netherlands. The output of this 106 Watt system is not optimal, because the orientation of the modules is South-West at 45 degrees elevation. This should bring approx 94% of maximum yearly production, or 99.6Watt, which makes it a perfect reference for a 100 Watt AC module.

I was very lucky to have a reference myself, as I discovered on April 7, 2000. That day the Solar2900 output was not 28 times larger than my reference but only 26 times. I grabbed a current-meter and quickly found the trouble: one of the panel's connector had developed a bad contact. I had been working near the wires, so they had moved and the contact opened. This caused three panels to deliver no current, because they are wired in series (string) so I was 325 Watt down. This was detected using my 100 Watt reference, so it was worth having this and taking meter readings regularly!

Another interesting anomaly can be seen at July 17, where the power from the 2900W system is too low, compared to the 100W reference. Suspicion is, the voltage waveform is out of spec of the large inverter (you may say the inverter is too nitty-gritty about it) and refuses to startup. I have already received a patch for this, but want to see the problem & test the patch to solve it..

The column named (Used-Solar) may be a bit cryptic; this is the difference between the generated Solar power and the daily use of electricity in my house. In effect, this indicates how far the electricity meter turned forward that day. A negative value indicates the meter went backward. Sometimes I am not able to record the meters, usually when I am travelling. This is indicated by an empty row and "travel" in the last column. The next row is the TOTAL of all travel days.

Jan 2000 Solar2900 kWh Solar100 kWh (Used-Solar) kWh
1 . . travel
2 0.9 0.03 5
3 0.1 0.00 7
4 0.0 0.00 12
5 3.5 0.12 3
6 1.4 0.04 4
7 0.6 0.02 3
8 0.0 0.00 3
9 1.6 0.05 10
10 0.5 0.02 3
11 2.8 0.10 -1
12 3.4 0.11 7
13 0.3 0.01 4
14 0.1 0.01 3
15 3.0 0.09 3
16 0.4 0.02 9
17 . . travel
18 . . travel
19 . . travel
20 1.5 0.04 15
21 1.2 0.04 3
22 0.7 0.03 9
23 . . travel
24 . . travel
25 . . travel
26 . . travel
27 9.5 0.32 13
28 0.2 0.01 8
29 0.1 0.00 9
30 1.1 0.04 3
31 0.9 0.03 5
Month 33.8 1.13 140
Since 11mar99 1975.8 31.31 -422
Feb 2000 Solar2900 kWh Solar100 kWh (Used-Solar) kWh
1 1.0 0.03 1
2 3.6 0.12 6
3 3.2 0.11 0
4 0.0 0.00 4
5 4.8 0.16 0
6 1.0 0.03 3
7 2.3 0.08 1
8 0.2 0.00 9
9 1.5 0.05 4
10 1.7 0.06 1
11 7.4 0.25 -2
12 2.6 0.08 3
13 5.8 0.20 -2
14 6.2 0.21 -3
15 3.7 0.12 4
16 4.2 0.14 1
17 2.0 0.04 2
18 0.2 0.01 3
19 . . travel
20 6.7 0.23 1
21 4.6 0.15 -3
22 2.3 0.08 8
23 7.0 0.24 -2
24 1.8 0.06 3
25 8.7 0.30 -4
26 7.8 0.27 -4
27 6.6 0.22 3
28 0.4 0.01 3
29 2.7 0.10 5
Month 100.0 3.35 45
Since 11mar99 2075.8 34.66 -377
Mar 2000 Solar2900 kWh Solar100 kWh (Used-Solar) kWh
1 6.1 0.21 -4
2 2.6 0.08 3
3 3.6 0.12 5
4 6.6 0.23 -3
5 2.9 0.10 1
6 1.9 0.06 4
7 2.8 0.10 2
8 0.1 0.00 6
9 . . travel
10 6.2 0.20 3
11 . . travel
12 5.3 0.18 1
13 3.1 0.10 2
14 0.4 0.02 3
15 3.4 0.11 8
16 0.6 0.02 2
17 0.7 0.02 2
18 1.6 0.06 4
19 . . travel
20 . . travel
21 . . travel
22 26.0 0.87 -4
23 10.2 0.34 -5
24 1.0 0.04 2
25 4.6 0.15 -2
26 8.3 0.29 1
27 3.8 0.12 0
28 0.4 0.01 4
29 0.9 0.04 3
30 0.9 0.03 7
31 2.6 0.09 2
Month 106.8 3.59 43
Since 11mar99 2182.6 38.25 -334
Apr 2000 Solar2900 kWh Solar100 kWh (Used-Solar) kWh
1 4.7 0.16 0
2 6.9 0.23 2
3 . . travel
4 14.6 0.48 -6
5 4.4 0.15 1
6 12.2 0.41 -9
7 13.8 0.52 -9
8 6.2 0.21 2
9 13.9 0.50 -10
10 15.3 0.55 -10
11 9.3 0.32 -6
12 8.5 0.31 -4
13 2.6 0.09 2
14 8.8 0.32 -1
15 6.1 0.22 0
16 12.2 0.44 -8
17 9.0 0.33 -4
18 10.1 0.36 -7
19 . . travel
20 22.1 0.80 -13
21 9.8 0.34 -2
22 6.2 0.21 -1
23 2.9 0.10 +2
24 8.1 0.30 0
25 13.2 0.46 -10
26 . . travel
27 . . travel
28 30.3 1.07 -13
29 . . travel
30 . . travel
Month 251.2 8.88 -104
Since 11mar99 2433.8 47.13 -438
May 2000 Solar2900 kWh Solar100 kWh (Used-Solar) kWh
1 . . travel
2 . . travel
3 . . travel
4 . . travel
5 40.4 1.43 -30
6 14.0 0.49 -5
7 11.4 0.40 -6
8 . . travel
9 . . travel
10 . . travel
11 50.5 1.78 -32
12 15.3 0.55 -9
13 16.2 0.58 -8
14 15.2 0.54 -10
15 14.5 0.51 -12
16 13.1 0.47 -8
17 10.3 0.35 -2
18 9.5 0.34 -5
19 6.2 0.22 -1
20 11.4 0.40 -9
21 4.4 0.15 0
22 6.5 0.23 -3
23 6.6 0.23 0
24 6.8 0.24 -1
25 8.8 0.31 -3
26 10.8 0.39 -7
27 12.6 0.45 -7
28 4.8 0.18 +3
29 7.7 0.26 -4
30 8.8 0.32 -4
31 13.8 0.49 -9
Month 319.6 10.31 -172
Since 11mar99 2753.4 57.44 -610
June 2000 Solar2900 kWh Solar100 kWh (Used-Solar) kWh
1 5.7 0.20 +2
2 14.4 0.51 -11
3 11.6 0.41 -6
4 11.5 0.41 -8
5 . . travel
6 8.6 0.29 3
7 11.5 0.41 -8
8 16.7 0.58 -10
9 14.8 0.53 -11
10 6.6 0.28 -4
11 12.2 0.45 -3
12 . . travel
13 . . travel
14 . . travel
15 . . travel
16 . . travel
17 . . travel
18 86.1 3.10 -53
19 14.8 0.48 -8
20 13.7 0.41 -10
21 8.2 0.31 -3
22 6.5 0.23 -1
23 7.3 0.27 -1
24 7.2 0.27 -3
25 6.9 0.25 -2
26 10.0 0.39 -5
27 14.1 0.54 -10
28 9.9 0.37 -5
29 11.6 0.45 -8
30 13.1 0.50 -10
Month 323.0 11.64 -175
Since 11mar99 3076.4 69.08 -785
July 2000 Solar2900 kWh Solar100 kWh (Used-Solar) kWh
1 . . travel
2 13.6 0.49 -4
3 8.4 0.30 -4
4 9.7 0.36 -6
5 5.0 0.18 2
6 9.4 0.35 -5
7 8.3 0.30 -4
8 5.7 0.21 +2
9 1.6 0.06 +8
10 9.5 0.36 -5
11 8.0 0.31 -2
12 11.1 0.41 -7
13 2.4 0.08 2
14 6.8 0.25 -1
15 8.2 0.31 -5
16 7.4 0.27 -5
17 1.4 0.12 6
18 7.4 0.27 -5
19 3.6 0.12 6
20 10.5 0.40 -6
21 16.0 0.61 -12
22 6.6 0.24 0
23 11.1 0.43 -4
24 6.5 0.23 -2
25 . . travel
26 . . travel
27 . . travel
28 . . travel
29 . . travel
30 . . travel
31 . . travel
Month 178.2 6.66 -51
Since 11mar99 3254.6 75.74 -836
Aug 2000 Solar2900 kWh Solar100 kWh (Used-Solar) kWh
1 . . travel
2 62.6 2.27 -44
3 11.2 0.42 -3
4 8.9 0.31 -3
5 10.5 0.39 -6
6 9.2 0.34 -7
7 6.7 0.24 2
8 9.6 0.36 -5
9 12.5 0.45 -8
10 3.5 0.11 5
11 . . travel
12 . . travel
13 35.0 1.29 -30
14 9.3 0.34 -7
15 7.2 0.26 -4
16 9.3 0.35 -7
17 10.8 0.41 -7
18 7.0 0.25 5
19 5.9 0.21 -1
20 9.4 0.35 -4
21 8.0 0.29 -5
22 7.8 0.28 -3
23 12.9 0.47 -6
24 12.8 0.48 -9
25 . . travel
26 . . travel
27 20.8 0.75 -16
28 9.4 0.35 -7
29 5.2 0.18 3
30 8.2 0.30 -1
31 10.0 0.37 -4
Month 323.7 11.82 -172
Since 11mar99 3578.3 87.56 -1008
Sept 2000 Solar2900 kWh Solar100 kWh (Used-Solar) kWh
1 4.1 0.14 1
2 4.8 0.17 -1
3 3.7 0.13 -1
4 4.2 0.15 0
5 7.4 0.27 0
6 2.1 0.07 4
7 5.6 0.20 -3
8 1.1 0.03 3
9 2.0 0.06 8
10 . . travel
11 . . travel
12 . . travel
13 . . travel
14 . . travel
15 35.2 1.51 -4
16 6.1 0.21 -2
17 2.5 0.08 4
18 5.1 0.18 2
19 10.7 0.40 -7
20 0.8 0.02 4
21 1.1 0.03 4
22 7.9 0.28 -4
23 10.4 0.39 -6
24 . . travel
25 20.6 0.76 -11
26 . . travel
27 10.5 0.39 0
28 1.9 0.06 3
29 8.9 0.33 -5
30 4.1 0.14 3
Month 160.8 6.00 -8
Since 11mar99 3739.1 93.56 -1016
Oct 2000 Solar2900 kWh Solar100 kWh (Used-Solar) kWh
1 0.1 0.00 4
2 4.4 0.16 0
3 5.2 0.19 -1
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