SMA SMC 7000HV Installation - Manual (Page 48)

Electrical Connection SMA Solar Technology AG
48 SMC70HV11-IA-IEN112970 Installation Manual
5.7.2 Setting Stand-alone Grid Operation
To operate the inverter in an off-grid system with Sunny Island, you must set the "Default" parameter
to stand-alone grid ("OFF-Grid") operation.
You have several possibilities to set the inverter to stand-alone grid operation:
• Setting via Sunny WebBox
or
• Setting via Sunny Explorer.
5.7.3 Additional Country Parameters
The deactivation criteria (voltage, frequency, impedance) are specified via country parameters as
with all Sunny Mini Central inverters.
The Sunny Mini Central inverters of type SMC 7000HV-11 have an additional default country
parameter "MVtgDirective". This expands the deactivation limits of the inverter for voltage and
frequency to a maximum/minimum. This country setting may only be selected if the PV plant or inverter
is operated with external three-phase decoupling protection which will automatically disconnect the
Sunny Mini Central from the power distribution grid if non-permissible voltage and frequency values
occur. Device protection is still guaranteed.
DANGER!
Danger to life due to high voltages in the event of outage of the
power distribution grid!
If you set the inverter to stand-alone grid operation, it does not fulfill any country-specific
standards and guidelines. Therefore, in the event of outage of the power distribution grid,
there is a danger of back feed.
• Never operate the inverter directly on the power distribution grid when set to
off-grid operation.
Requirement for the setting
Set the installation country as described in section 5.7.1 "Setting the Installation Country"
(page 47) before setting the country parameter described here.
DANGER!
Risk of lethal electric shock if external decoupling protection is missing!
If the country setting is "MVtgDirective", the Sunny Mini Central of type SMC 7000HV-11
may only be operated with an external three-phase decoupling protection device which
complies with the country-specific requirements.
Without such external decoupling protection, the Sunny Mini Central will not disconnect
from the power distribution grid when the standard requirement is exceeded.
• Install external three-phase decoupling protection.