Connecting The Inverter To The Utility Grid - SMA SUNNY BOY STORAGE 2.5 Operating Manual

6 Electrical Connection
Overvoltage category:
The inverter can be used in grids of overvoltage category III or lower in accordance with
IEC 60664-1. That means that the inverter can be permanently connected to the grid-connection
point of a building. In case of installations with long outdoor cabling routes, additional measures to
reduce overvoltage category IV to overvoltage category III are required (see the Technical
Information "Overvoltage Protection" at www.SMA-Solar.com).
Grounding conductor monitoring:
The inverter is equipped with a grounding conductor monitoring device. This grounding conductor
monitoring device detects when there is no grounding conductor connected and disconnects the
inverter from the utility grid if this is the case. Depending on the installation site and grid
configuration, it may be advisable to disable the grounding conductor monitoring. This can be
necessary, for example, in a Delta IT system or other grid configurations if there is no neutral
conductor present and you intend to install the inverter between two line conductors. If you are
uncertain about this, contact your grid operator or SMA Solar Technology AG.
• Grounding conductor monitoring must be disabled after initial start-up depending on the grid
configuration (see Section 8.13, page 66).
Safety in accordance with IEC 62109 when the grounding conductor
monitoring is deactivated
In order to guarantee safety in accordance with IEC 62109 when the grounding conductor
monitoring is deactivated, you have to connect additional grounding:
• In order to guarantee safety in accordance with IEC 62109 when the grounding
conductor monitoring is deactivated, you have to connect additional grounding (see
Section 6.2.3, page 34): The additional grounding conductor must have the same cross-
section as the connected grounding conductor at the connecting terminal plate for the AC
cable. This prevents touch current if the grounding conductor at the connecting terminal
plate for the AC cable fails.
Connection of additional grounding
In some countries, additional grounding is generally required. In each case, observe the
locally applicable regulations.
• If additional grounding is required, connect an additional grounding that has at least the
same cross-section as the connected grounding conductor to the connecting terminal
plate for the AC cable (see Section 6.2.3, page 34). This prevents touch current if the
grounding conductor at the connecting terminal plate for the AC cable fails.
6.2.2

Connecting the Inverter to the Utility Grid

Requirements:
☐ Only the terminal block supplied may be used for the AC connection.
☐ The connection requirements of the grid operator must be met.
☐ The grid voltage must be within the permissible range. The exact operating range of the
inverter is specified in the operating parameters.
32 SBS25-1VL-10-BE-en-13
SMA Solar Technology AG
Operating manual