SMA eCharger - Overvoltage Category; AC Cable Requirements; Multi-EVC Operation

6 Electrical Connection
SMA Solar Technology AG
Operating manualEVC22-3AC-20-BE-en-1040
6.1.4 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).
6.1.5 AC cable requirements
☐ Conductor type: copper wire
☐ The conductors must be solid or fine-stranded. When using fine-stranded wire, bootlace
ferrules can be used.
☐ Outer diameter: 14mmto25mm
☐ Conductor cross-section PE: 2.5 mm² to 10 mm² (rigid) / 2.5 mm² to 6 mm² (flexible).
☐ Conductor cross-section of line conductor and neutral conductor: 2.5 mm² to 10 mm² (rigid) /
2.5 mm² to 6 mm² (flexible).
☐ Insulation stripping length: 18 mm to 20 mm
☐ Sheath stripping length: about 100 mm
☐ The cable must be dimensioned in accordance with the local and national directives for the
dimensioning of cables. The requirements for the minimum conductor cross-section derive from
these directives. Examples of factors influencing cable dimensioning are: nominal AC current,
type of cable, routing method, cable bundling, ambient temperature and maximum desired
line losses (for calculation of line losses, see the design software "SunnyDesign" from software
version2.0 at www.SMA-Solar.com).
6.1.6 Multi-EVC operation
Multi-EVC operation allows you to connect up to three SMA EV chargers. In multi-EVC operation
mode, all charging stations must be connected to the utility grid on a rolling basis.
The Sunny Home Manager provides the charging stations with information on the number of active
charging stations every minute.
In multi-EVC operation mode, if multiple charging stations are charging vehicles and there is a two-
phase charging vehicle among the vehicles, this vehicle is limited to single-phase charging for
symmetry reasons.