SMA America, LLC Electrical Connection
SB50US-80US-IA-en-36 SB50US-80US-IA-en-36 41
6.5 AC Connection
6.5.1 AC Connection Requirements
For all AC cable connections to the Sunny Boy, use a max. 6 AWG copper wire that is designed for
+194 °F (+90 °C) – even if voltage drop and other considerations mean that the use of larger cable
cross-sections is required.
CAUTION
Rist of fire
Overcurrent may lead to a cable fire.
• The electrical installation must include overvoltage protection for the AC output
circuit.
• Set up the overvoltage protection for a maximum of 50 A.
Carry out all electrical installations according to all of the applicable on-site electrical
standards and the National Electrical Code
®
(NE, ANSI/NFPA 70).
See National Electrical Code, Section 690-64(b) (2).
For installations in Canada, observe the applicable Canadian standards.
Only use solid wire or stranded wire
• Do not use fine-wire strands.
• Use the free of charge "Sunny Design" at www.SMA-America.com to design your PV
plant.
Ambient temperature
The higher the ambient temperature, the higher the power losses.
• Use cables with large cable cross-sections in installation sites with high ambient
temperatures.
Routing method
The cables heat up during operation. If there are several cables in a conduit, the
temperature of all cables increases.
• Use cables with a large cross-section if you lay several cables in one conduit.
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