aleo
aleo solar Deutschland GmbH
| Osterstraße 15| 26122 Oldenburg | Germany | service@aleo-solar.com
installation instructions Edition 01/2012 en-GB-Intl (120508b)
Page 19/60
5.11.
Matching of solar modules and inverters
NOTICE
Orientate all aleo modules connected to a particular
MPP tracker of an inverter in the same direction
(same azimuth) and with the same inclination from
horizontal (same elevation).
If the photovoltaic generator is located in an area
with strong reflections (e.g. due to snow or areas of
water), the maximum electricity and therefore the
maximum performance of the photovoltaic genera-
tor may be increased. Please take this into consi-
deration when arranging the inverter.
Make sure the aleo modules and the inverters to be
used are compatible with one another ([18], [19],
[23]).
To optimise output, aleo solar recommends always operating
photovoltaic generators with at least one MPP tracker. MPP
trackers are integrated into most inverters. Details on the
MPP tracker can be found in the inverter manual.
Some of the literature recommends a slight under-
dimensioning of the inverter, e.g. to 90% of the expected
maximum output of the photovoltaic generator. Other litera-
ture recommends that the inverter arrangement should be
100% or a little higher.
These arrangement options have the following effects that
should be considered during the planning phase:
A slightly
under-dimensioned
inverter has the
following consequences:
it can be slightly cheaper to purchase
it generally leads to smaller yields
it can age a little more quickly.
A slightly
over-dimensioned
inverter has the
following consequences:
it can be slightly more expensive to purchase
it generally leads to larger yields
it can age a little more slowly.
If a single inverter is not sufficient for your
situation, then you have the following options:
use several MPP trackers or inverters
-OR-
use an inverter that features several
independent MPP tracker inputs.
5.11.1.
Parallel connection of module strings
Parallel connection of module strings can reduce the number
of required inverter inputs. Please observe the following
information when using parallel connection:
NOTICE
Parallel connection of module strings most likely
costs less than the use of numerous inverters or
MPP trackers.
Several inverters or an inverter with several
independent inputs for module strings entails
higher acquisition costs in most cases. Such a
system can, however, achieve higher yields during
its planned lifetime that offset or even exceed the
additional costs.
Only parallel connect those module strings with
identically orientated modules
2
the same number of modules
modules of the same type and the same
output class.
Please note the information on the parallel
connection of module strings in Ch. 5.12.6, 'String
diodes' and Ch. 5.12.7, 'Direct current string fuses'.
Deviating from these recommendations can significantly
affect the output of a photovoltaic system, increase the risk of
damages, and reduce the service life of the modules.
5.12.
Electrical installation
WARNING
All electrically relevant components of a photovoltaic
system (modules, cables, connectors, string fuses, fire
prevention switches, DC isolators, inverters, etc.) must
be approved for the voltages and currents that can
occur in the photovoltaic system under consideration
([20], [22], [24]).
CAUTION
Only use connecting cables without
softeners. This ensures the reliable and safe
operation of the system.
Information on cable properties can be
obtained from the cable manufacturers.
2
Same orientation (same azimuth) and same inclination (same
elevation).
G
ID A
S
033
c
G
ID A
S
039
c
