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Old 11-24-08, 02:02 AM   #11
groar
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Default Hourly production of 2008/11/23

I will not do it everyday, but I thought it could be interesting once.

Yesterday's weather was variable, but mainly cloudy. An average November day should generate 3.6kWh. Yesterday only 2.37kWh were generated.

The sunrise was at around 8h and the sunset at around 17h30. The inverter switched on at around 8h15 and began to produce at around 8h30, but the reselling counter didn't shown any instantaneous power before 8h45. During all the morning, the sun didn't appeared. Don't forget also that our PV system is toward the West and the sun can't see it before 10AM, so before that it's only the ambient luminosity that generates power.

Code:
 time WInv WRes DaWh OutA InV#1/2 InA#1/2 G/R
08h00    0    0    0                      0/1
09h00   25   20    9 0.62 197/183 0.2/0.1 1/0
10h00  105   80   70 0.89 210/193 0.3/0.2 1/0
11h00  227  250  216 1.41 213/187 0.7/0.7 1/0
12h00  379  410  498 2.14 233/220 1.1/1.0 1/0
13h00  416  440  944 2.23 233/216 1.0/1.0 2/0
14h00 1580 1680 1523 7.05 235/218 4.1/4.1 5/0
15h15   82   80 2197 0.87 205/188 0.3/0.3 1/0
16h00  175  150 2322 1.23 211/195 0.5/0.4 1/0
17h00    0    0 2370                      0/1
Where :
  • time : clock
  • WInv : Instantaneous W generated by inverter
  • WRes : Instantaneous W received by reselling counter
  • DaWh : Cumulative Daily Wh generated by inverter
  • OutA : Instantaneous A generated by inverter
  • InV#1/2 : Instantaneous V received by inverter in strings 1/2
  • InA#1/2 : Instantaneous A received by inverter in strings 1/2
  • G/R : Number of Green/Red lit LEDs

The instantaneous production shown on the reselling counter is updated less often than the one shown by the inverter, so the first is smoother than the second.
When the Red LED is lit then no production is generated as the power received from the panel isn't enough to generate some power. The Green LEDs correspond to power generated by inverter. Each LED is at most 400W, ie 1 LED means 0-399W, 2 LEDs 400-799W, 3 LEDs 800-1199W... But to switch a LED on or off, the inverter wait to have several consecutive measures in the corresponding range, so at 2PM there was 5 LED for only 1580W.

The new maximum values are :
Code:
Out : 1686W 7.801A 238V
In1 : 1029W 4.441A 279V
In2 :  949W 4.634A 260V
Bad, the In1/2 max values can be seen only when the inverter is switched on by panel power.

Denis.

__________________
Earth absorbs 1.8 t CO2/head/yr, while a French generates 6.2 t CO2/yr
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  • kg saved 06/08-08/09: 1816.9+382.9 (ecodriving / 1420mi not driven) = 2199.8
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    (2.66 kg/l diesel)
  • kg saved by 3kWc photo-voltaic solar panels : 187 kg/yr
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    (59.1 g/kWh)
Radioactive wastes saved by 3kWc photo-voltaic solar panels :
  • Long life (>100,000 years) : 2.85 g/yr (0.9 mg/kWh)
  • Short life (<300 years) : 31.7 g/yr (10.0 mg/kWh)
Based upon "official" French figures...
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