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OPERATING PRINCIPLE OF PANELS
PEAK POWER VS POWER DURING ACTUAL USE
Peak Power is measured under Standardized test conditions (STC) : Insolation of 1000W/m², cell
temperature at 25°C.
During real use the panel temperature is at 45°C +/- 2% and the maximum insolation strength is of
850W/m².
A panel of 300W peak often only produces 200W in reality (see table below)
Panel
(STC norm)
400W
600W
900W
*Temperature correction = 0.4% / degree above 25°C or 8% loss for 45°C (NOCT)
**Insolation correction = see explanation above
36
Ex: France
Lille
(north)
Marseille
(south)
Real power with
Real power with
corrected
corrected insolation
temperature
(loss of 8%)*
(loss of 25%)**
370W
555W
830W
Winter
200W/m²
700W/m²
500W/m²
850W/m²
Power with
loss due to
if 850W/m²
(2 to 5%)
280W
415W
625W
www.uniteck.fr
Summer
Charging current
with low battery
wiring
between 10V and
11V
275W
30A
410W
40A
610W
60A
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