Solar meter model 10.0 photovoltaic PV meter
Solar irradiance photovoltaic light PV visible + near IR
- Integral Sensor
- LCD readout
- Sun Irradiance Metrology
- Solar PV Panel Input Rays
- Estimate PV Array Power
|Solar meter Specifications |
|Irrad. Range||0-1999 W/m|
|Peak Response||940 nm|
|Accuracy||5% Ref. WRR|
|Detector||Silicon Photo diode|
|Conv. Rate||3.0 Readings/Sec|
|Display||3.5 Digit LCD|
|Digit Size||0.4 inch high|
|Oper. Temp||32 F TO100 F|
|Oper. Humid.||5% TO 80% RH|
|Dimensions (in.)||4.2L x 2.4W x 0.9D (inches)|
|Weight||4.5 OZ. (incl. batt.)|
|Power Source||9-Volt DC Battery|
|Diffuser||Virgin PTFE .005|
Example Calculation with PV Meter reading 1000 W/m perpendicular to 10 m array at 10 m active area, 14% cells efficiency, 95% converter efficiency, 40 C:
- 1000 W/m x 10 m = 10000 Watts incoming sun power
- 10000 W x 0.14 cell efficiency = 1400 Watts
- 1400 W x 0.95 conversion efficiency = 1330 Watts
Typical temperature coefficient loss for PV cells is -0.5% per degree C over 25...
or 7.5% for 40 in this example (15 x 0.5% = 7.5% loss or 92.5% of above value. So:
- 1330 W x 0.925 = 1230 Watts.
Lastly, a small wiring & component loss of ~1% reduces PV output down to ~1218 W.
Energy Production over Time:
The above 1218 Watts value is an "instantaneous" number. Energy is Watt (or kilowatt) hours. So if the solar irradiance remained constant for an hour near noon, the energy produced would be 1218 WH.
To estimate power over the entire day... take readings every hour and apply the above examples. Then add up each hour's value x number of hours for daily Watt Hours. Of course the value will increase toward summer, peaking near June 21 in northern hemisphere... and decrease toward winter, lowest near December 21 solstice. Southern hemisphere is opposite
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