SMA Solar Technology AG
Safety
Installation Guide
SB3300TLHC-IEN094121
7
2 Safety
2.1 Appropriate Usage
The Sunny Boy is a PV inverter that converts the DC current of solar cells to AC current and feeds it
into the public grid.
Principle of a PV system with this Sunny Boy
The Sunny Boy may only be operated with PV generators (modules and cabling) of protection class
II. Do not connect any sources of energy other than PV modules to the Sunny Boy.
PV modules with large capacities relative to ground, such as thin-film modules with cells on a metallic
substrate, are only to be implemented if their coupling capacity is below 50 nF/kWp.
During grid feeding, a leakage current whose magnitude depends on the manner in which the
modules are installed and on the weather (rain, snow) flows from the cells to ground. This operational
leakage current is not to exceed a value of 50 mA.
When designing the PV system, ensure that the values comply with the permitted operating range of
all components at all times. The free design program "Sunny Design"
(www.SMA.de/en/SunnyDesign) will assist you. The manufacturer of the PV modules must have
approved the modules for use with this Sunny Boy unit. You must also ensure that all measures
recommended by the module manufacturer for long-term maintenance of the module properties are
taken (see also Technical Information "Module Technology", in the download area of
www.SMA.de/en).
Do not use the Sunny Boy for purposes other than those described here. Alternative uses,
modifications to the Sunny Boy or the installation of components not expressly recommended or sold
by the manufacturer void the warranty claims and operation permission.
