SMA SB 3000TL-20 Installation - Manual (Page 8)

Safety SMA Solar Technology AG
8 SB30TL_40TL_50TL-IA-IEN120231 Installation Guide
2 Safety
2.1 Appropriate usage
The Sunny Boy is a PV inverter which converts the DC current of a PV generator into AC current and
feeds it into the public grid.
Principle of a PV System with this Sunny Boy
The inverter may only be operated with PV generators (PV modules and cabling) of protection class
II. Do not connect any sources of energy other than PV modules to the inverter.
Capacitive Discharge Currents
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 does not exceed
1,400 nF.
During grid feeding, a discharge current flows from the cells to ground. The amount of
current depends on the manner in which the modules are installed (e.g. foil on metal roof)
and on the weather (rain, snow). This "normal" discharge current may not exceed 50 mA
due to the fact that the inverter would otherwise automatically disconnect from the grid as
a protective measure. For further information on this subject, see the Technical Information
"Capacitive Discharge Currents" in the download area at www.SMA.de/en.