Programm Photovoltaik Ausgabe 2009 ... - Bundesamt für Energie BFE

TEST cycle 11
In 2008 a new 15 months test cycle (no.11) began. Thirteen different module types were chosen, in an
attempt to include the greater part of available technologies: 4 mc-Si (one with EWT backcontact), 3
sc-Si, 1 HIT (new version), 1 a-Si/a-Si tandem module, 1 a-Si/µc-Si (micromorph) and 2 CIS.
The anonymous purchase of only 3 modules has been more complex compared to the past, particularly
various modules chosen at the beginning could not been purchased and it has been necessary to
opt for other typologies.
Verification of the delivered power (Pa):
The difference between Power at Purchase (Pa) and Nominal Power (Pn) of the modules shouldn’t be
greater than Production Tolerance (tp).
Power (Pn), production tolerance (tp), warranties (w) given by the manufacturer, power at purchase
(Pa) and differences are shown in Table 1.
In test cycle 11 the power at the purchase of crystalline silicon technologies (including HIT) was on
average -2.6% lower with respect to Pn but ranging from +0.5% and -10.5%. In 8 out of 27 cases,
corresponding to three different module types, power at purchase was outside production tolerance
(see Table 1). Possible reasons for this will be further investigated. Some seems to be more related to
defects in the cells, whereas others could be related to manufacturer’s declarations or here not considered
measurement problematic.
Manufacturer Type Pn [W] Warranty Tolerance (%) Pa [W] � Pn
153.0 -1.3%
Advent Advent 155
155
--
±3% 153.5 -1.0%
154.1 -0.6%
217.1 -1.3%
Sunways SM 210U
220
10%/12y
±3% 219.1 -0.4%
213.3 -3.0%
215.8 -1.9%
SolarDay PX60
220
10%/10y
±3% 218.3 -0.8%
217.0 -1.4%
173.5 -3.6%
Day4 Energy Day4 48 180
180
10%/10y ±3.5% 176.7 -1.8%
161.1 -10.5%
132.2 -2.8%
3-S Megaslate
136
--
±5% 131.6 -3.2%
130.9 -3.7%
176.7 -4.5%
BP Solar BP7185N
185
10%/12y +5%, 0 177.0 -4.3%
177.3 -4.2%
176.0 -2.2%
Trina TSM180 DC01 180
10%/10y
±3% 178.1 -1.1%
179.4 -0.3%
142.1 -5.3%
Isofoton IS-150S/24
150
10%/10y
±3% 140.2 -6.5%
142.4 -5.1%
210.2 0.1%
Sanyo HIP-210 NKHE1 210
10%/10y +10%, -5% 210.7 0.3%
211.0 0.5%
73.3 -2.2%
Würth WSG0036E075 75
--
+5%, -2% 72.8 -2.9%
71.3 -4.9%
48.1 -12.5%
Sulfurcell SCG55-HV-F
55
10%/10y
±5% 47.9 -12.9%
48.7 -11.5%
102.0 2.0%
Sharp NA-851WQ
100
10%/10y ±10% 103.1 3.1%
102.1 2.1%
47.5 18.9%
Bangkok Solar BS40
40
--
±10% 45.8 14.4%
53.9 34.7%
Table 1: Comparison with nominal power and power at purchase of the modules in cycle 11.
As for c-Si modules, thin-film devices were initially tested to verify the acquired power (see Table 1).
In thin-film a-Si modules the given power is already stabilized. The stabilization of the performance of
a module normally takes a few months and the verification is only possible when power is stabilized.
Nevertheless, the initial power of the BS40 (Bangkok Solar) modules is up to 34.7% higher and at the
planning stage the system has to work at higher power, current and voltage for a number of months.
The micromorph a-Si/µc-Si modules of Sharp show an initial mean difference (Pa) of just +2.4% compared
to the nominal power (Pn). The verification after the degradation at 3 months will indicate if the
power will remain in between the warranty limits on the long term.
Centrale di test ISAAC-TISO, D. Chianese, SUPSI, DACD, ISAAC-TISO
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