8
INV250 / INV350 / INV500
02.2020
Activate output via fibre optics:
•
Switch off AC
•
LED signals the start of the output sequence by „ON“ for 5 sec.
•
LED outputs the data as a pulse pattern (duration approx. 50
sec.)
•
LED signals the end of the output sequence with 5 sec. „ON
•
LED switches to normal signalling mode
The LED output sequence must be recorded via a video
(smartphone, digital camera, or similar) with a resolution of
680x480DPI. This video is then analysed using PC software. The
software can be found on the AEconversion website (http://
aeconversion.com/de/downloads.html). After successful analysis
of the video, the set values are displayed in plain text. When
recording, make sure that a few seconds of the start and end
of the output sequence are recorded. If possible, the position
of the LED on the screen must always remain the same. Please
observe further instructions when running the software.
Additional option for versions with communication interface:
•
Establish a data connection between the PC and the Micro
Inverter
•
Download AEsolar software
•
Query the device via the corresponding menu item
6.0 Operating Conditions
The selection of the PV generator is of central importance in the
design of a PV system. It is essential to ensure that the inverter
also matches the PV module.
6.1 Dimensioning the PV generator
The number of PV modules connected in series must be selected
so that the output voltage of the PV generator does not exceed
the permitted input voltage range of the inverter, even at
extreme outdoor temperatures. In Central Europe, module
temperatures between -20°C and +70°C should be assumed.
Depending on the mounting type of the generators and the
geographical location, +60°C or +70°C is used in the voltage
calculation. You should take the temperature coefficients of the
PV modules into account. The following criteria must be fulfilled
for the voltage of the PV generator:
- Uo (-15°C) < max. input voltage::
45 V and -15°C for INV250
60 V and -15°C for INV350-60
90 V and -15°C for INV350-90
90V and -15°C for INV500
The open-circuit voltage of the connected PV generator must
remain within the permitted input voltage range even at very
low outside temperatures (-15 °C). When the temperature is
lowered from 25°C to -10°C, the open-circuit voltage increases
by approx. 2.8 V per module for 12 V modules (5.6 V for a 24V
module). The open circuit voltage of the entire PV generator
must be less than 45V for INV250, less than 60 V for INV350-
60,less than 90V for INV350-90 and less than 90V for INV500.
- U
Mpp
(+60 °C) > min. input voltage:
20 V
DC
for INV250
20 V
DC
for INV350-60
40 V
DC
for INV350-90
40 V
DC
für INV500
For INV250-45EU this voltage is 20 V.
For INV350-60EU this voltage is 20 V.
For INV350-90EU this voltage is 40 V.
For INV500-90EU this voltage is 40 V.
The U
Mpp
- Voltage of the connected string should not fall below
the allowed input voltage range even at very high module
temperatures (+60°C).
With a temperature rise from 25°C to
60°C, the UMpp voltage of 12 V modules drops by approx.
approx. 3.6 V per module (7.2 V for a 24 V module).
- The U
Mpp
-voltage of the whole PV generator should be at least
20V for INV250, 20V for INV350-60 and 40V for INV350-90 as well
as INV500.
If the U
Mpp
-voltage falls below the permitted input range, the
system continues to operate without any problems. In this state,
however, the maximum possible power is no longer fed into the
grid, but slightly less.
It does not harm the inverter if a connected PV generator
delivers a higher input current than the maximum usable input
current, provided the input voltage is within the permissible
range. It may happen that the inverter switches off for safety
reasons if the PV generator briefly provides more than the max.
DC input power of the inverter, especially during changing cloud
cover and relatively low module temperatures.
Normally, however, the control of the inverter is so dynamic that
it continues to operate without interruption.
In general, for an optimal energy yield of the
PV generator in Central Europe, a southern orientation with an
inclination of 30° should be selected. The optimal power factor
for south-facing systems is between 1.10 and 1.25.
For an east-west system, the power factor can be selected up to
1.30. The prerequisite is that all other limit values of the inverter
are complied with. For exposed locations in the mountains or
in southern regions, a corresponding reduction (< 1.15) of the
power ratio is necessary.
7.0 Installation
Select the mounting position so that the following points are
observed:
•
As good as possible access to the unit for installation work or any
service work that may need to be carried out at a later date. .
•
Ensure a minimum distance of 20 mm between the upper
edge of the roof and the underside of the inverter. We also
recommend a distance of 25 mm between the back of the PV
module and the top edge of the inverter.
•
The unit is designed to be mounted on the mounting frame
under a PV module, but other mounting variants are possible.
•
The inverter is to be mounted so that the connection area of
the inverter faces downwards
•
The inverter is to be mounted so that the cover (type label) is
always facing upwards
•
The free air flow around the enclosure must not be obstructed.