Electrical Connection; Requirements For The Electrical Connection; Residual-Current Monitoring Unit (Rcmu); Overvoltage Category - SMA SUNNY HIGHPOWER PEAK3 SHP 100-21 Operating Manual

7 Electrical Connection

7 Electrical Connection
7.1

Requirements for the electrical connection

7.1.1

Residual-current monitoring unit (RCMU)

The product is equipped with an all-pole sensitive residual-current monitoring unit in accordance with IEC/EN 62109-2
and VDE 0126-1-1. The all-pole sensitive residual-current monitoring unit monitors AC and DC residual currents and
redundantly disconnects the product from the utility grid if residual current jumps of > 30 mA occur. If the residual-
current monitoring unit malfunctions, all poles of the product are immediately disconnected from the utility grid. If the
protection provided by automatic disconnection of the power supply in accordance with DIN VDE 0100-410 is
fulfilled by an appropriate overcurrent protective device, the product does not require an external residual-current
device to operate safely. If local regulations require the use of a residual-current device, the following must be
observed:
• The inverter is compatible with type B residual-current devices. For SHP 100-21 the rated residual current must be
1000 mA and for SHP 150-21 the rated residual current must be 1500 mA or higher (for information on selecting
a residual-current device, see Technical Information "Criteria for Selecting a Residual-Current Device" under
www.SMA-Solar.com). Each inverter in the system must be connected to the utility grid via a separate residual-
current device.
• When using residual-current device with a lower rated residual current, there is a risk of false tripping of the
residual-current device, depending on the system design.
7.1.2

Overvoltage category

The product can be used in grids of overvoltage category III or lower in accordance with IEC 60664-1. That means
that the product 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).
7.1.3

AC cable requirements

☐ Aluminum or copper cables must be used.
☐ The conductors must be round conductors or 90° sector-shaped conductors.
☐ The conductors must be solid, stranded or fine-stranded. When using fine-stranded wire, bootlace ferrules must be
used.
☐ Cable cross-section for round conductors: 50 mm² to 150 mm²
☐ Cable cross-section for sector-shaped conductors: 120 mm² or 150 mm²
☐ External diameter: 27 mm to 48 mm
Also see:
• Connecting the AC Cable ⇒ page 34
7.1.4

Network cable requirements

The cable length and quality affect the quality of the signal. Observe the following cable requirements:
☐ Cable type: 100BaseTx
☐ Cable category: minimum CAT5e
☐ Plug type: RJ45 of Cat5, Cat5e or higher with metal enclosure
☐ Shielding: SF/UTP, S/UTP, SF/FTP or S/FTP
☐ Number of insulated conductor pairs and insulated conductor cross-section: at least 2 x 2 x 0.22 mm²
☐ Maximum cable length between 2 nodes when using patch cables: 50 m
☐ Maximum cable length between 2 nodes when using installation cables: 100 m
30 SHPxxx-21-BE-en-10
SMA Solar Technology AG
Operating manual