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SMA Technologie AG Installation Requirements

Installation Guide SB25_30-11:SE0307 Page 17

For optimum operation of the inverters, the grid impedance of the AC cable must not

exceed 1 Ohm. This is necessary, amongst other things, for the correct operation of the

impedance monitoring. In addition, we recommend dimensioning the cable cross-

section so that output losses do not exceed 1 % at nominal power. Output losses as a

function of cable length and cross-section are shown in the graphs below. Multi-wire

cables with copper forward and return conductors are used.

Output Losses of the Sunny Boy SB 2500

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

Cable cross-section 1.5 mm² 2.5 mm²

Max. length 9 m 15.5 m

Do not use cables where losses will exceed 1.0 %

Cable length

Output losses

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 65 66

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PV Powered 2500 Installationsanleitung Seite 17