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3 connection to the power distribution grid (ac), 1 conditions for the ac connection, Connection to the power distribution grid (ac) – SMA SB 3300 Installation User Manual

Page 22: Conditions for the ac connection

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Electrical Connection

SMA Solar Technology AG

22

SB33_38-IEN111851

Installation Guide

5.3 Connection to the Power Distribution Grid (AC)

5.3.1 Conditions for the AC Connection

Cable sizing

For optimum operation of the inverter, the grid impedance of the AC cable must not exceed 1 ohm.
This is necessary, amongst other things, for the correct operation of the inverter.
The conductor cross-section should be dimensioned in a way that cable losses do not exceed 1 % at
nominal power. Use "Sunny Design" (www.SMA.de/en/SunnyDesign) for this.
The maximum cable lengths are shown in the following table. Do not exceed the maximum cable
length.

The conductor cross-sectional area required in individual cases depends on the following factors:

• Ambient temperature,
• Routing method,
• Cable losses,
• valid installation guidelines of the respective country (of the installation location).

Cable Requirements

Connection requirements of the electric power company
Always observe the connection requirements of your electric power company.

Conductor cross-section

Maximum cable length

SB 3300

SB 3800

4 mm²

18.5 m

16 m

Position

Description

Value

A

External diameter

6 mm ... 14 mm

B

Conductor cross-section

4 mm²

C

Strip insulation

8 mm

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