14
USER MANUAL
It is a good practice to mount inverter in the middle
of the panel width, regardless if the panel is placed in
portrait or landscape position.
Horizontal placement of the inverter
Connecting cables to micro inverter
Connecting cables to micro inverter is simple. Just connect
DC cables connectors into matched panel DC connectors
coming from panel junction box. Push connectors together
until they latch with audible CLICK.
Some DC connectors are marked with + and – engraved on
plastic. Polarity is valid for panel side. On micro inverter,
we placed two additional colored signs on DC wires. BLUE
for DC- and RED for DC+ wire. Please take care about right
polarity while connecting inverters. Before connecting the
inverter measure voltage polarity on PV module.
Insert AC connector from inverter into T junction connector
on the cable. Again, push connectors until audible CLICK is
heard and connector is latched.
Micro inverter must be connected to the utility grid in
accordance with local standards and permissions.
Letrika Solar micro inverter 260 has built in interface
protection system (IPS) according to VDE 4105. All frequency,
voltage and anti-islanding protections are embedded inside
micro inverter. Also power factor, voltage control functions are
built-in. Inside micro inverter is a relay with double contacts
to physically disconnect micro inverter from the grid. External
IPS must be connected between micro inverters and grid if
required by local standards and permission.
3.2 Connecting cables to micro inverter
3.3 Connecting micro inverter system to utility grid
We strongly suggest to mount surge protection devices into
roof junction box or better, to use surge protector systems
that are mounted in same housing as micro inverter and can
be connected to standard ALTW PT 3 wire system allowing
placement of surge protections also in between micro
inverters improving surge immunity.
Please contact Letrika Sol for details on surge protection
devices.
INSTALLATION PROCEDURE
