SMA SC 500HE-US Installation - Manual (Page 14)

2 Safety SMA America, LLC
14 SC500HEUS-IA-US_en-14 Installation Manual
2 Safety
In this section you will find general safety directions which you must observe throughout the entire
installation process. Pay special attention to this section, so as to avoid personal and material
damages.
2.1 Appropriate Usage
The Sunny Central is a MPPT (maximum power point tracker) PV inverter that converts the DC energy
from PV modules to AC energy. This energy is then fed into the public grid.
The Sunny Central 500HE‑US is designed for indoor and outdoor installation.
The Sunny Central HE-US is a high efficiency PV inverter and it does not include a transformer inside
its cabinets. You can connect up to 2 Sunny Centrals to one transformer.
External output transformer requirements
• The Sunny Central has been evaluated by UL for compliance with Underwriters Laboratory (UL)
1741 / IEEE 1547 requirements at the inverter terminals and with UL Recognized external
transformer Model 3UI380/310, Manufactured by J. Schneider. This transformer is rated for a
voltage of 200 V L-L on the inverter side and an impedance of less than 6%.
• If the Sunny Central is used with a different transformer other than the transformer used during
testing, the external transformer used must be a UL Listed type, with separate primary and
secondary windings rated 500 kVA minimum, and limited to a maximum impedance variance
of less than or equal to 6%. This external transformer is required to be located between the
output of the Sunny Central and the utility power connection.
The Authority Having Jurisdiction (AHJ) must consider the possible consequences of using a different
transformer other than the one used to evaluate the Sunny Central by UL. In addition, the AHJ must
consider the effects of using different UL Listed transformers with respect to electrical ratings,
impedance, and the resultant affect on the performance of the inverter, with respect to the ratings and
impedance specified in the installation manual.
Refer to the technical description "Transformer Requirements" for a detailed Transfomer information.
The description is available at www.sma-america.com and www.sma-solar.com
Principle of a PV Power System with a Sunny Central
A B C D G E F