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4 Installation
WARNING
Risk of death by electrocution!
The StecaGrid inverter may only be connected to the grid by qualified person-
nel in accordance with the regulations of IEC standard 60364, the VDEW direc-
tives/TAB 2010 applicable in Germany and the regulations of the local power
supply company.
When working on the solar system, disconnect the inverter from the power
supply.
Make sure that the power supply cannot be unintentionally switched on.
Do not interrupt the DC connection between the solar modules and from the
solar modules to the inverter while current is flowing. In case the DC connec-
tion must be cut off, begin by disconnecting the inverter from the grid and
then activate the DC circuit breaker.
Be careful that the connector is correctly assembled. In case of bad crimp con-
tact: Risk of melting!
Lay the cable such that the connection cannot come loose accidentally.
Press the DC connection together until it audibly snaps into place.
4.1 General requirements for installation
When using several inverters in a phase, the maximum permitted connected load
in Germany is 4.6 kVA. Higher outputs must be distributed onto several phases.
When loads are distributed onto several phases, however, phase inequality must
not be more than 4.6 kVA. Please refer to the national and/or regional regula-
tions regarding details about the connection conditions.
This essentially means that each inverter or group of inverters must be connect-
ed to its own fuse group in the electrical installation by way of a mains switch/
mains isolation switch. The mains switch must be located in the same room as
the inverter and have sufficient switching capacity. In this case, the photovoltaic
system must be viewed as a load on the power grid.
An exception to this is when the inverter(s) is (are) also in the low-voltage distribu-
tion room; in this instance a separate switch is not required, because the relevant
group switch can take on this function.
The installer must ensure that all applicable installation regulations, national
laws, installation standards and connection load values of the regional power
supply company are adhered to.
Cable cross-section and fuse:
P
Nom
Cross-section Fuse
2 kW 1,5 mm² B16
4 kW 2,5 mm² B25
6 kW
4 mm² B32
4.2 Notes on installation
CAUTION
Damage to the inverter!
Do not install the inverter:
In rooms which are too hot
In dusty rooms
In rooms where highly flammable gas mixtures can occur
Keep the cables of the solar modules as short as possible.
Do not install the inverter in locations where it will be subjected to vibration.
Do not block the air flow which cools the inverter. A space of at least 20 cm
must be left above and below the device to allow air to circulate around the
device.
The electrical connections must be made in the correct order:
1. Connect the equipment to the grid
2. Connect the PV generator
3. Switch on the DC circuit breaker
4. Connect power cable safety switch
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