SMA Sunny Boy Control - Manual (Page 142)

Sunny Boy Control
SMA Technologie AG
User Manual SUNBC - 14 : NE0206 138
Phase Coupling
When the communication path spans several phases, strong signal damping or a loss
of communication range should be expected. If a string inverter is connected to a
different phase (e.g., L2) than the Sunny Boy Control (e.g., L1), which we do not
recommend, data transmission will be possible only if the phases are coupled at suffi-
ciently high frequency. In many households, this is taken care of by three-phase ap-
pliances such as ranges, ACs, and heaters.
Although the transmission may be improved by installing a phase coupler in the
power distribution, communication over several phases remains a problem due to the
following:
•
The detour via the phase coupler results in a longer transmission path.
•
High-frequency coupling of phases boosts the damping effect of electrical
devices connected to the different phases.
L1
L3
Betrieb
Opera tion Erdschlus s Earth Fault Störung Failure
Photovoltaik -Stringw echselrichter Phot ovol taic string invert er SWR 1100E Betrie b Oper ation Erdschluss
Earth Faul t Störun g Failure
Photov oltaik- Stringw echselrichte r Photovol taic string inverter SWR 1100E Betrieb Operat ion Erdschluss
Earth Fault Störung
Failure
Photov oltaik -Stringwech selrichter Photo voltai c string inverte r SWR 1100 E
PAC 1273 W
House distribution Sub-distribution
Phase coupler Phase coupler
L1
L2
L3
Connection
to utility
Sunny Boy
Control
Fig. 9.10: Interference suppression in case of phase coupling