SMA SB 3300TL Installation - Manual (Page 23)

SMA Technologie AG Installation
Installation Guide SB3300TL-11:SE2006 Page 23
PV String (DC) Connection
Connect the PV strings as follows:
1. Check the PV generator connection on their cor-
rect polarity and compliance with the maximum
string voltage of 750 V DC, see chapter 4.2
„Requirements: PV Modules” (page 15).
The voltage from the string is very dangerous! Be very careful and
pay attention to all applicable safety regulations!
2. Measure the DC voltages between the PV plug
connector of the string and ground potential.
Follow the safety instructions!
3. If the measured voltages are constant and their
total approximately corresponds to the open-
circuit voltage of the string, a ground fault has
occured in the string. The ratios of voltages
approximately indicate where the ground fault
can be found.
When you have found a ground fault in a string, only connect it to
the Sunny Boy 3300TL after you have removed the cause for the
ground fault in the PV generator.
4. Connect the trouble-free PV string to the Sunny
Boy 3300TL. Make sure to connect it with
correct polarization.
PE
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