SMA SUNNY BOY SMART ENERGY 3.8-US Manual Del Usuario página 6

2 Safety
2 Safety
2.1 Intended Use
The Sunny Boy Smart Energy is a single-phase, transformerless hybrid inverter with 3 PV inputs and
a battery connection that feeds the direct current of the PV module into the connected battery or
converts it to grid-compliant alternating current and then feeds it into the utility grid. The Sunny Boy
Smart Energy also converts the direct current supplied by the battery into grid-compliant alternating
current. In a system with additional PV inverters, the Sunny Boy Smart Energy can convert the
alternating current generated by the PV inverters into direct current and feed it into the battery.
The Sunny Boy Smart Energy has a manual secure power supply function, SMA Backup Secure.
When needed, e.g., in the event of a power outage, the Sunny Boy Smart Energy can continue to
supply selected loads with electricity from the battery and the PV system by means of a socket
connected to the inverter.
The product must only be used as stationary equipment.
The product is suitable for indoor and outdoor use.
The product may only be operated with PV modules and cables that are approved in accordance
with the electrical standards applicable on-site and the National Electrical Code
No galvanic isolation
The product is not equipped with a transformer and therefore has no galvanic isolation.
• Do not operate grounded PV modules or batteries together with the product. If grounded
PV modules or batteries are connected to the product, then an event will occur. The event
will 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.
• Only ground the enclosure of the battery.
• 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 can be
grounded depending on the configuration.
PV modules with a high capacity to ground must only be used if the coupling capacity of all PV
modules does not exceed 1.54 µF (for information on how to determine the coupling capacity, see
the Technical Information "Leading Leakage Currents" at www.SMA-Solar.com).
To protect the PV system against excessive reverse currents under fault conditions, a DC-side
overcurrent protective device must be connected in accordance with the National Electrical Code
to prevent any short-circuit currents that exceed the ampacity of the DC electric circuit or the
maximum series fuse rating of the PV modules. Typically, string fuses are used if more than two
strings are connected in parallel.
The product may only be operated in connection with a lithium-ion battery approved by SMA Solar
Technology AG. An updated list of batteries approved by SMA Solar Technology AG can be
found in the system manual at www.SMA-Solar.com.
The battery must comply with UL 1973 and must be intrinsically safe.
6 SBSExx-US-50-ISS-xx-10
SMA Solar Technology AG
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ANSI/NFPA 70.
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