10
USER MANUAL
Letrika micro inverters are compatible with monocrystalline
and polycrystalline panels with 60 and 72 cells per panel.
Thin film panels are normally not suitable because of
higher panel dc voltage incompatible with micro inverter
input range. However some thin film panels with output
voltage of approx. 50V can still be used with Letrika micro
inverters. Thin film modules have a risk of TCO corrosion.
Consult the producer of thin film panels how to ground
the positive or negative terminal of the PV module. Letrika
Solar micro inverter 260 allows using the positive or
negative grounding.
PV modules from 220Wp up to 310Wp can be connected
to the inverter. Using lower power PV modules, the micro
During installation it is a good idea to follow a check list of
operations. We will describe general approach that allows
installation of the inverters that is easy to manage and
maintain.
3 Installation procedure
3.1 Compatible PV modules
INSTALLATION PROCEDURE
inverter power is not entirely used, efficiency is lower and
this affect the production of electricity.
When higher power PV modules are used, consider that the
micro inverter can deliver approx. 300W of AC power for
approx. 20 minutes at 30°C.
During selection of PV modules power consider also
average and peak operating ambient temperature. From
the point of view of micro inverter performances, there
is no derating in performances until 65 degrees ambient
temperature is reached.
Open circuit voltages (Uoc) and short circuit currents (Isc)
of PV modules shouldn’t exceed the declared values in
technical specification.
