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SMA SB 700 User Manual

Page 17

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SMA

Technologie AG

Installation requirements

Installation Guide

SB700-11:SA2006

Page 17

The system impedance at the installation site of the Sunny Boy 700 must be less than
1 Ohms for the islanding detection and the fuses to work porperly. In addition, we
recommend dimensioning the cable cross-section so that line losses do not exceed 1%
at the nominal power. Line losses depending on the cable length and cross-section
are shown in the graph below. It shows a multi-conduit cable with all conduits made
of copper.

The maximum cable lengths for the different cable cross-sections are as follows:

Cable cross-section

1.5 mm²

2.5 mm²

Max. length

33 m

55 m

0,0%

0,2%

0,4%

0,6%

0,8%

1,0%

1,2%

1,4%

Cable length

0 m

10 m

15 m

20 m

25 m

30 m

35 m

40 m

45 m

50 m

5 m

Loss

1,5 mm²

2,5 mm²

Do not use cables where the losses will exceed 1.0 %.