Connecting The Pv Array - SMA Sunny Boy 3000TL-US Installation Manual

6 Electrical Connection
☐ For an optimum yield all PV modules of one input area should be mounted with the same
inclination and azimuth orientation.
Cable requirements:
☐ Solid or stranded wire of copper with no more than 19 single wires
☐ Conductor cross-section: 12 AWG to 6 AWG (5.3 mm² to 13.3 mm²)
☐ The DC cables must be designed for the maximum temperature of the DC terminals
of +221°F (+105°C).
☐ The cables must be designed in accordance with local directives and the National Electrical
®
Code
. Influencing factors for cable dimensioning are, for example, the nominal DC current,
the type of cable, the routing method, cable bundling, ambient temperature, and the maximum
desired line losses.
Additionally required mounting material (not included in the scope of delivery):
☐ Conduit fittings (
3
☐ Conduits ( ⁄ in. (19 mm))
4

6.4.3 Connecting the PV Array

Destruction of the inverter due to overvoltage
If the open-circuit voltage of the PV modules exceeds the maximum system voltage of the inverter,
the inverter can be destroyed by overvoltage.
• Ensure that the open-circuit voltage of the PV modules does not exceed the maximum input
voltage of the inverter.
• Otherwise, do not connect strings to the inverter; check the design of the PV system.
1. Switch off or open all AC disconnecting switches and circuit breakers in the output circuit of the
inverter and secure against reconnection.
2. If an external DC disconnecting switch is available, switch off or open the DC disconnecting
switch.
3. If there is no external DC disconnecting switch available, cover the PV modules with opaque
material or disconnect the connectors on the PV modules.
4. Ensure that no DC voltage is present on the DC cables of the PV array.
40 SB3-5TLUS22-IA-en-12
3
⁄ in. (19 mm)), rain-tight or for wet locations when installed outdoors
4
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Installation Manual