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2 Safety
2.1 Intended Use
The Sunny Boy is a transformerless PV inverter which converts the direct current of the PV array to
grid-compliant alternating current and feeds it into the utility grid.
The product is suitable for indoor and outdoor use.
All components must remain within their permitted operating ranges at all times.
The product must only be operated with PV arrays (PV modules and cabling) that are approved by
the electrical standards applicable on-site and the NationalElectricalCode
®
ANSI/NFPA 70 or
the CanadianElectricalCode
®
CSA C22.1.
No galvanic isolation
The product is not equipped with a transformer and therefore has no galvanic isolation.
Do not operate grounded PV modules together with the product. If grounded PV modules
are connected to the product, an event will occur which will appear on the product
display. The event will also be displayed, along with the associated message, in the event
list on the user interface of the product.
Only ground the mounting frames of the PV modules.
The neutral conductor of the AC output is not bonded to ground within the product.
The neutral conductor of the AC output for secure power supply operation is bonded to
ground within the product.
PV modules with a high capacity to ground may only be used if their coupling capacity does not
exceed 2.5 μF.
To protect the PV system against excessive reverse currents under fault conditions, the National
Electrical Code
®
, Section 690.9, requires overcurrent protection for PV source circuits where
possible short-circuit currents exceed the ampacity of source circuit conductors or the maximum
series fuse rating of the PV modules. Typically, this requires string fusing where more than two
strings are combined in parallel. Where overcurrent protection is required, National Electrical
Code
®
, Section 690.35, requires that both positive and negative conductors have overcurrent
protection for ungrounded PV arrays.
The product must only be used in countries for which it is approved or released by SMA and the
grid operator.
Use this product only in accordance with the information provided in the enclosed documentation
and with the locally applicable standards and directives. Any other application may cause
personal injury or property damage.
Alterations to the product, e.g. changes or modifications, are only permitted with the express written
permission of SMA. Unauthorized alterations will void guarantee and warranty claims and in most
cases terminate the operating license. SMA shall not be held liable for any damage caused by
such changes.
Any use of the product other than that described in the Intended Use section does not qualify as
appropriate.
The enclosed documentation is an integral part of this product. Keep the documentation in a
convenient place for future reference and observe all instructions contained therein.
2 Safety
SMA Solar Technology America LLC
User ManualSB30-77-1SP-US-40-BA-en-1110
10


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