Hengdian Group DMEGC Magnetics Co., Ltd.
Resistance to ammonia
Solar module DM250-M125-96
DLG Test Report 6074 F
Evaluation – short version
Test results (comparison before/after ammonia climatic stress)
Assessment*
Power conservation
No power degradation
Manufacturer
Hengdian Group DMEGC Magnetics
Co., Ltd. · DMEGC Solar Energy
Hengdian Industrial Area, Dongyang
Zhejiang Province · China
solar@dmegc.com.cn
www.dmegcsolar.com
Applicant
F.EE Solar- und Energietechnik GmbH
In der Seugn 10
92431 Neunburg v. Wald · Germany
contact@fee.de · www.fee.de
++
Visual inspection
Minor abnormalities were noted, but no damage

Dielectric withstand test and wet leakage current test
Despite a slight drop in the dielectric withstand
a normal or high level will be maintained
n.e.
Evaluation scale
The following evaluation scale is applied in the DLG FokusTest "Ammonia resistance":
Evaluation
Test result: Power conservation
Test result: Visual inspection
++
+
≤ -2 %
no alterations
> -2.0 % to≤ -3.5 %
very minor abnormalities

> -3.5 % to≤ -5.0 %
minor abnormalities
The DLG-FokusTest "Ammonia resistance" is considered passed if the insulation requirements
are fulfilled and the test criteria "power conservation" and "visual inspection" are evaluated
at least "standard".
DLG e.V.
Test Center
Technology and Farm Inputs
* Evaluation range: + + / + // – / – – ( = standard / n.e. = no evaluation)
DLG Test Report 6074 F
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Main technical data (according to the manufacturer)
Construction
Solar module (photovoltaic module) consisting of mono crystalline silicon solar cells (c-Si) comprising:
– 96 cells made of c-Si (125 mm x 125 mm, 8 x 12),
– embedding material EVA (ethylene vinyl acetate)
– 3.2 mm glass cover panel
– foil rear side
– 45 mm frame made of an anodized aluminum alloy
Connection
Junction box
1 junction box with 4 bypass diodes
Connectors
MC4-compatible
Connection line
Section 4 mm², length 2 x 900 mm
Electrical module data (type: DM250-M125-96)
Rated power, PMPP
250 Wp
Rated current, IMPP
5.05 A
Rated voltage, UMPP
49.5 V
Short-circuit current, ISC
5.51 A
No-load voltage, UOC
59.8 V
System voltage, U
1000 V
Module efficiency
14.92 %
Power tolerance under STC
0 % to +3 %
Temperature coefficients
TK PMPP = -0.45 %/K
TK ISC = +0.05 %/K
TK UOC = -0.35 %/%
Series Fuse
15 A
Dimensions and weight
Length / Width / Height
1590 mm / 1064 mm / 45 mm
Weight
20 kg
Explanation of abbreviations
–Current (I) and voltage (U) assume different values between zero and a maximum, depending on the load (short-circuit current at U=0 and
no-load voltage at I=0). Thus, a strong current, for example, causes voltage to drop and vice versa. The greatest output is produced only at
one operating point, the maximum power point (MPP).
-For the purpose of comparability, PV-module parameters (PMPP, UMPP and IMPP) are determined under the following standard test conditions
(STC) according to IEC 60904: cell temperature: 25 °C, irradiation intensity: 1000 W/m² and a defined light spectrum (class A sun simulator) with an AirMass of AM=1.5.
DLG Test Report 6074 F
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Test results
Power conservation
2,0
1,0
Change in power [%]
The PV module type "DM250M125-96" passed the DLG FokusTest "Ammonia resistance". Based
on this result, one can ­assume that
this module type is ­resistant to
­animal house air con­taining ammonia and that the aging process to
be expected under ­normal circumstances is not acce­lerated.
Visual inspection
During visual inspection, no
damage or noticeable alterations
were found before or after the
climate test.
After the climatic test in the ammonia gas chamber, minimal residues
on the front and back side were
visible. On the frame, the residues
were slightly increased.
At the junction box, slight residues
could be identified inside and outside.
-1,0
-2,0
-3,0
Module No. 1
Module No. 2
-4,0
maximum permissible
change in power during
the DLG Ammonia Test
-5,0
The results of power measurement
before and after the climate test are
compiled in Table 1 and Figure 2.
No drop in performance was ascertained (DLG evaluation: ++).
Annotations
The measured power values are relative
values and not absolute values. This is due
to the fact that the flasher used for the
measurement (type: cetisPV-XF2M AM 1.5
Class A sun simulator) was not calibrated
with the same cell material as the tested
units.
For type approval according to DIN EN
61215, the power decrease may not
exceed 5 % (this only applies for (STC)
standard test conditions).
0
-6,0
1000
800
200
Irradiation [W/m²]
Figure 2:
Performance after the climate change test under ammonia atmosphere
The connectors showed superficial
changes during the course of the
ammonia exposure.
The rear-side foil and the type plate
were slightly discolored after the
ammonia test.
Altogether, these alterations are
considered to be minimal.
Dielectric withstand test
During the dielectric withstand
test, the requirements (no breakdown, no surface rupture, dielectric
withstand at least 40 MΩm²) were
fulfilled. In the new condition,
withstand levels of more than
1692 MΩm² were measured.
After the climate test the dielectric
withstand had dropped slightly
by up to 13 % compared to the
initial ­values. The withstand
values changed to 1506 MΩm²
(Module 1) and from 1477 to MΩm²
(Module 2).
For a solar module, the average
dielectric withstand after the
ammonia test is at a high
level (range: >1000 MΩm² to
1500 MΩm²) *.
Wet leakage current test
The required dielectric withstand
of at least 40 MΩm² was attained.
In the new condition, withstand
levels of approx. 164 MΩm² were
measured. After the climate test
the dielectric withstand had
dropped slightly compared to
the initial values. The withstand
values changed from 167 MΩm²
to 150 MΩm² and from 161 MΩm²
to 142 MΩm².
Thus, dielectric withstand at the
wet leakage current test is at a
normal level after the ammonia
test (value range: >100 MΩm² to
150 MΩm²)*.
* DLG evaluation standard “dielectric withstand”
in the DLG Test “Resistance to ammonia for PV
modules”
Table 1: Power conservation
Module No. Parameter
1000 W/m²
before
after
1
Power in MPP [Wp]
254.9
Change in power [%]
2
Power in MPP [Wp]
Change in power [%]
254.9
Irradiation intensity
800 W/m²
before
after
205.0
0.0
254.5
205.3
200 W/m²
before
after
49.6
0.2
256.0
+0.6
DLG Test Report 6074 F
204.8
+0.7
206.0
+0.6
50.0
47.4
50.2
+0.8
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Test conditions and performance of the test
The DLG FokusTest "Ammonia
resistance" was carried out as a
laboratory test according to the patented "DLG test standard for solar
modules in agricultural use". This
laboratory test is intended to determine the ability of the PV module
to withstand the effects of animalstable air over a usage period of
at least 20 years.
The test was carried out in a
gassing chamber under the following climate conditions:
Duration of test
Air temperature
Rel. atmospheric humidity
Ammonia concentration
1500
70
70
750
h
°C
%
ppm
For the evaluation of ammonia
­resistance, each module was subjected to visual inspection (10.1*),
a dielectric withstand test (10.3*),
a wet leakage current test (10.15*)
as well as an output measurement
(10.2*) before and after the climate
test.
The type “DM250-M125-96”
from the module series “DM250M125-96“ was registered for the
test.
In order to determine the capacity
under weaker irradiation conditions,
measurements at irradiation inten­
sities of 800 and 200 W/m² (irradiation intensity comparable to cloudy
weather) were carried out in addition to the STC setting (1,000 W/m²,
irradiation intensity comparable to
sunshine).
A reference module with an
iden­tical design (serial number:
DM2111111120196) was available
for the visual inspection after
the climate test.
The two modules used for the test
had the following serial numbers:
DM2111111120185 (No. 1),
DM2111111120191 (No. 2).
*Test step according to DIN EN 61215:2005
"Crystalline silicon terrestrial photovoltaic (PV)
modules: design qualification and type approval"
Test
The FokusTest included a climate
exposure test under laboratory conditions.
The DLG test label applies for the
power categories 220Wp to 260Wp
of the same module type series.
Based an the available results, the
PV-module type "DM250-M125-96"
fulfills the requirements with regard
to the test criterion "ammonia resistance" (evaluation "" or better) for
the awarding of the DLG-FokusTest
label.
Other criteria were not tested.
Realization of the test
Project director
Dipl.-Ing. (FH) S. Schwick, M.Sc.
Technology, safety, quality
Dipl.-Ing. W. Gramatte
DLG e.V. –
Test Center Technology
and Farm Inputs,
Max-Eyth-Weg 1,
D-64823 Gross-Umstadt
ENTAM – European Network for Testing of Agricultural Machines, is the association of
European test centres. ENTAM’s objective is the Europe-wide distribution of test results
for farmers, agricultural equipment dealers, and producers.
More information about the Network is available at www.entam.com or by writing to
ENTAM at the email address: info@entam.com
11-752
May 2012
© DLG
DLG e.V. – Test Center Technology and Farm Inputs
Max-Eyth-Weg 1, D-64823 Gross-Umstadt,
Telephone: 069 247 88-600, Fax: 069 247 88-690, E-mail: Tech@DLG.org,
Internet: www.DLG.org
Download of all DLG test reports free of charge at: www.DLG.org/testsagriculture.html!
DLG Test Report 6074 F
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