SMC Networks Sunny Mini Central SMC 5000A - Manual (Page 36)

Electrical Connection SMA Technologie AG
Page 36 SMC50A_60A-IEN073320 Installation Guide
The diagram shows the respective curves for a grid voltage without mains supply.
A maximum possible feed-in power per phase (X axis) is obtained for the
respective curves depending on the grid impedance (Y axis).
The power read on the X axis is approximately 5.8 kW per phase.
Consequently, only one Sunny Mini Central may be installed per phase in this
example. A higher output per phase, without causing a disconnection because of
AC overvoltage, requires better connection conditions for the Sunny Mini Central
(e.g. a cable with a larger cross-section).
With three-phase connection and symmetrical feeding, the maximum possible
feed-in power per phase is approximately doubled.
Example:
- The grid voltage without mains supply is 230 V
- The grid impedance at the terminal is 1.0 Ohms
Output [kW] per phase
Grid
i
m
pedan
ce [O
hm]