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4 Installation
Danger
Risk of death by electrocution!
X
The StecaGrid inverter may only be connected to the grid by qualified person-
nel in accordance with the regulations of IEC standard 60364 and the regula-
tions of the local power supply company.
X
When working on the solar power system, disconnect the inverter from the
power supply.
X
Make sure that the power supply cannot be unintentionally switched back on.
Danger of burns from arcing!
X
Do not interrupt the DC connection between the solar modules and between
the solar modules and the inverter while current is flowing. If the DC connec-
tion has to be interrupted, the integrated DC circuit breaker must be switched
off.
X
Press the MC connection of the DC connections together until it audibly snaps
into place.
Note
The illustrations in this chapter show the StecaGrid 10000 3ph.
4.1 General requirements for installation
The inverter feeds the grid symmetrically in 3 phases. This means that phase im-
balances cannot occur. For proper operation, the neutral conductor and the PE
must be connected in addition to the 3 phases.
Every inverter must be connected to the electrical system via a line circuit breaker
on all three phases. This must be situated close to the inverter.
A DC circuit breaker is required in all CENELEC countries (The Netherlands, Ger-
many, Spain, Italy, etc.)
*)
This is already integrated into the inverter.
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.
*) See IEC standard IEC60364-7-712 for further information.
Cable cross-section and fuse:
Type
P
rated
Cross-section
Line circuit
breaker
StecaGrid 8000 3ph
8.0 kW
5 x 2.5 mm² fine-stranded
3 x B20
5 x 4 mm² single-stranded
3 x B25
StecaGrid 10000 3ph 9.5 kW
5 x 2.5 mm² fine-stranded
3 x B20
5 x 4 mm² single-stranded
3 x B25
4.2
Notes on installation
Caution
Danger of damage to the inverter!
X
Do not install the inverter:
• in extremely warm environments with temperatures over +60 °C (output der-
ating from +50 °C),
• in dusty environments,
• in an environment where highly flammable gas mixtures can occur (potential-
ly explosive atmosphere).
X
Keep the cables of the solar modules as short as possible.
X
Do not install the inverter in locations where it will be subjected to vibrations.
X
The inverter must not be installed in a closed switching cabinet.
X
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.
Due to its protection degree (IP54), the StecaGrid inverter can be installed in nu-
merous locations. However, a number of points must be observed during installa-
