SMA SUNNY BOY 1300TL - AC Connection; Requirements for the AC Connection

6 Electrical Connection SMA Solar Technology AG
26 SB13_21TL-IA-en-65 Installation Manual
6.3 AC Connection
6.3.1 Requirements for the AC Connection
Cable requirements:
☐ External diameter: 7 mm to 14 mm
☐ Conductor cross-section: max. 2.5 mm²
☐ Stripping length: 5 mm
☐ The cable must be dimensioned in accordance with any local and national guidelines on cable
dimensions which specify requirements for the minimum conductor cross-section. Factors
influencing cable dimensioning are e.g.: nominal AC current, type of cable, type of routing,
cable bundling, ambient temperature and maximum specified line losses (for calculation of line
losses, see design software "Sunny Design" from software version 2.0 at www.SMA-Solar.com).
Switch-disconnector and cable protection:
☐ In plants with multiple inverters, each inverter must be protected with a separate miniature
circuit-breaker. Make sure that the maximum permissible fuse protection is observed
(see Section12 "Technical Data", page60). That prevents residual voltage being present in the
cable after disconnection.
☐ Loads installed between the inverter and the miniature circuit-breaker must be fused separately.
Residual-current monitoring unit:
• If an external residual-current device is a mandatory requirement, install a device that trips at a
residual current of 100 mA or higher (for information on choice of residual-current devices,
see Technical Information "Criteria for Selecting a Residual-Current Device" at
www.SMA-Solar.com).
Overvoltage Category
The inverter can be deployed in grids of installation category III or lower, as defined under
IEC 60664-1. This means that the inverter can be permanently connected at the grid-connection point
in a building. In installations involving long cable routes outdoors, additional overvoltage-reducing
measures must be taken so that the overvoltage category is reduced from IV to III (see Technical
Information "Overvoltage Protection" at www.SMA-Solar.com).
Damage to the inverter through use of screw-type fuses as switch-disconnectors
Screw-type fuses (e.g., DIAZED or NEOZED fuses) do not have load disconnection properties and
may damage the inverter if it is disconnected under load.
• Do not use screw-type fuses as switch-disconnectors.
• Use a switch-disconnector or miniature circuit-breaker as a load disconnection unit
(for information and examples for designing, see Technical Information
"Miniature Circuit-Breaker" at www.SMA-Solar.com).