Requirements for the AC Connection
AC cable requirements as follows:
Conductor type: copper wire (flexible)
External diameter: 14 mm to 25 mm
Conductor cross-section: 1.5 mm² to 10 mm²
Insulation stripping length: 12 mm
Sheath stripping length: 80 mm to 90 mm
The cable must be dimensioned in accordance with the local and national directives for the dimensioning of cables. The requirements for the minimum wire size derive from these directives. Examples of factors influencing cable dimensioning are: nominal AC current, the connected AC backup loads, 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).
Recommendation: Use a cable with the marking H07
Residual-current monitoring unit:
The inverter does not require an external residual-current device when operating. If local regulations require the use of a residual-current device, the following must be observed:
The inverter is compatible with type A residual-current devices with a rated residual current of 100 mA or higher (see Technical Information "Criteria for Selecting a Residual-Current Device" in www.SMA-Solar.com for information on how to select a residual-current device). Each inverter in the system must be connected to the utility grid via a separate residual-current device.
The internal residual-current device monitors the leakage current of the battery and PV connections and not the leakage current of the loads connected to the AC backup.
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).