Option 2: Ac Cabling With Junction Box; Connecting The Inverter To The Sunny Multigate - SMA SUNNY BOY 240 Instruction Manual

SMA Solar Technology AG
6.7

Option 2: AC Cabling with Junction Box

As an alternative to the AC field plug, you can use a junction box with feed-through terminal for the
connection of the inverter AC cable to the Sunny Multigate. For the assembly and connection of the
AC cable, follow the instructions of the junction box manufacturer.
Cable requirements:
☐ Cable cross-section: 2.5 mm²
☐ Cable type: PV cable, Nexans 269 Photovoltaic Energyflex PV07AC-F BW 3 G 2.5 mm²
450/750 V
☐ Temperature resistant up to +90°C
☐ External diameter of the cable sheath: 9.6 mm to 10 mm
☐ Number of stranded wires: 46
☐ Cable type: copper wire, tin-plated
☐ Wire cross-section: 0.25 mm²
6.8

Connecting the Inverter to the Sunny Multigate

Connect the free end of the AC cable coming from the AC field plug to the connecting terminal plate
of the Sunny Multigate. The connecting terminal plate assigned for this is labeled Inverter.
Requirement:
☐ The Sunny Multigate must be correctly installed in the distribution box.
Cable requirements:
☐ Do not use shielded cables.
☐ Only use copper cables.
☐ Temperature resistant up to +90°C
☐ Only use cables with stranded wires: 1.5 mm² to 6.0 mm²
Installation of several Sunny Multigate devices
When installing several Sunny Multigate devices in a PV system, a three-wire cable with a
grounding conductor each must be used per Sunny Multigate in order to guarantee
trouble-free communication between the Sunny Multigate and the inverter.
Procedure:
1.
Danger to life due to electric shock
• Ensure that the circuit breaker is switched off and ensure that it cannot be reconnected.
• Ensure that the PV modules are covered.
2. Route the AC cable of the first inverter to the terminal Inverter of the Sunny Multigate.
Installation Manual
6 Electrical Connection
SMG-SB240-IA-en-11 39