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Product specifications

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MASTERVOLT SOLAR SUNMASTER QS SERIES
TECHNICAL CURVES
QS1200
0
200
400
600
800
1000
1200
0 50 100 150 200 250 300 350 400 450 500
DC Voltage [V]
DC Power [W]
0
1
2
3
4
5
6
DC Current [A]
QS3200/5000 per MPPT input
0
200
400
600
800
1000
1200
1400
1600
1800
0 50 100 150 200 250 300 350 400 450 500
DC Voltage [V]
DC Power [W]
0
1
2
3
4
5
6
7
8
DC Current [A]
QS2000
0
500
1000
1500
2000
0 50 100 150 200 250 300 350 400 450 500
DC Voltage [V]
DC Power [W]
0
1
2
3
4
5
6
7
8
DC Current [A]
Rated DC power @40°C
Max. DC power
Rated DC current @40°C
Max. DC current
Designing your PV system
As can be seen from the specifications, the QS series offers a full
range of products for systems from 700 to 5000Wp. The solar input
window is wide (typically 5-9 72 cell modules in series per string) and
design flexibility is optimal because of the multiple solar inputs for
the QS3200 and QS5000. The multiple solar inputs enable you to
design a system with virtually any number of
modules, with different strings lengths or orien-
tations, without loss of yield due to mismatch.
To guide you through this wide variety of
options we provide the
PV Design Wizard,
that will be available at our website from the
end of 2001 onwards.
The graphs on this page show the typical DC power and current
behaviour vs. the DC voltage for the QS1200, QS2000 and for each
input of the QS3200 (two inputs*) and QS5000 (three inputs*).
We distinguish:
• The rated current and power at 40°C: this is the maximum power
and current that can be converted continuously at an ambient tem-
perature of 40°C. At lower ambient temperatures the rated current
and power are higher.
• The maximum power and current: these are the limits at which the
current and power are limited by the control software to prevent
damage. The maximum current and power level can typically be
maintained for 10 to 15 minutes. After this time the inverter will
derate the DC power depending on inverter temperature, eventu-
ally to the level of the rated power and current.
When determining the number of modules per string and number
of strings per input, please check the following:
(example: 1 string of 9 modules (120Wp, Umpp: 33V; Uoc: 42V; Impp:3.6A) connected to the QS1200)
* Important: as can be seen from the specifications, the QS3200 and
QS5000 can be configured to have two respectively three inputs or to
have one single input. The characteristics of this single input configu-
ration are similar to the characteristics per input, but with power and
current numbers multiplied by two (QS3200) or three (QS5000).
Methodology Example
1. Determine the amount of overdimensioning of the system you allow,
i.e. how much bigger is the PV array (in Wp) allowed to be in respect
to the rated power of the inverter (in W). This factor is typically
somewhere between 1,2 and 1,33. 1.3
2. The open circuit voltage (Voc) at STC per module multiplied by
the number of modules in series should be higher than 200VDC 9 x 42=
and lower than 390VDC. 378 Ok
3. When you are connecting more strings, the string length of strings
connected to the same input, should be equal. Ok
4. When you have determined the number of modules per string,
determine the maximum power point voltage (Umpp) at STC
per string: Umpp per module, multiplied by the number of modules 9 x 33=
in series. Look in the graph of the QS inverter you are going to use 297V
and determine the rated current at this Umpp. ~ 2,8A
5. The total maximum power point current (Impp) you can connect 2.8 x 1.3=
to an input should not exceed the rated current (see 3.) multiplied 3.64 > 3.6
by the overdimensioning factor you allow (see 1.). OK