18_06_07_Battery Backup Distribution_10010371_ENG_V1.8 Seite -26- von -38-
9. Connecting the grid – Main Supply
Please consult in every way your low voltage network-operator!
Make sure that you fulfil all the established technical connection requirements and national
standards of your country!
In particular, you have to ensure the continued safe and reliable operation of the networks
and the exclusion of any additional risk for people and property!
Connect the grid (L1/L2/L3/N) to the terminal block “X1”
Connect the PE-cabling in accordance with Chapter -7-
Make sure, that the maximum fuse rating* is
not more than 63A!
* in case of main-supply pre-fuses are exceeding this value, you have to install additional
fuses at a maximum value of 63A! (If this is the case, please take care about the “short
circuit selectivity in [kA]” to the pre-fuse!) According to the pre-fuse value of 63A – we
recommend a cable cross-section of 16mm
2
– e.g. cable NYY 4 x 16mm
2
.
10. Connecting the Distribution Board (Load/PV)
10.1 Island-Mode (Backup Function)
During the island-mode, building’s distribution board protection devices against electric
shock (like RCCB or RCBO) are ensuring furthermore, that there will be no risk for people
within the consumer load circuits. Moreover, the Battery Backup Distributions “F7”-RCCB is
an additional personal protection concerning the safety of the cabling (terminal block “X2”).
The network configuration (for the loads) during the island mode is the “TN-S” System. This
is secured through an implemented (within the Battery Backup Distribution) “Earthing
Device”. Contactors “Q3” and “Q4” are doing the “PEN-connection” in a safe way, regulated
by the Sunny Island.
There might be circumstances for a non-tripping of some
distribution board’s protection devices! Pay attention to
this and have a look at the SMA paperwork!
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