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6
Design Consdieration
6.1 Space for handling and ventilation
The three phase pad-mounted transformer location should provide enough space:
• Allow the installation maneuvers.
• Pad-mounted transformer can perform inspection and maintenance tasks.
• Please refer to SUNGROW container inverter/container PCS and check the gaps
required for unit maintenance to ensure good ventilation.
6.2 Ambient Temperature
The limits specified by the standards by which the transformer was manufactured shall not
be exceeded (usually-30°C to 60°C).
If the site temperature is below -30°C or either above 60 °C, this need to be specified during
the technical discussion before the technical contract is signed.
6.3 Altitude
To be able to have the pad-mounted transformer nominal capability, in kVA, it is very
important at the time of installation to respect the maximum height over the sea level for
which was designed, whose reference is shown in the nameplate.
At high altitudes the air density decreases, reducing the cooling system efficiency as well as
the air dielectric strength.
The standard offer transformer Sungrow provide is of 1000m/3300ft, the transformer which
is used above this altitude need to specify the altitude and the ambient temperature when
place an order.
6.4 Voltage Variation
The transformer can be operated in a continuous way to nominal or smaller capability if the
primary voltage is between 0 and 5% smaller to the nominal value.
6.5 Audible Sound Emissions
All the transformers generate audible sounds when they are energized; this is due to the
mechanical vibrations generated by the magneto-striction phenomenon present in the core.
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