SMA SB 2800i Installation - Manual (Page 21)

Installation Guide Installation
SB2800i-11:SE0504 SMA Regelsysteme GmbH 19
PV string (DC) connection
Connect the PV strings as follows:
1. Check the PV generator connections on their correct polarity
and compliance with the maximum string voltage of 600 V
DC, see chapter 4.2 "Requirements: PV-Modules" (p. 12).
The voltage from the strings is very dangerous!
Be very careful and pay attention to all
applicable safety regulations!
2. Measure the DC voltages between each Multi-Contact plug
connector of a string and ground potential. Follow the safety
instructions!
3. If the voltages you measured is constant and more than a few
volts, a ground fault has occured in this 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 2800i
after you have removed the cause for the
ground fault in the PV generator.
4. Repeat steps 2 and 3 for each string.
5. Connect the trouble-free PV strings to the Sunny Boy. Make
sure to connect them to the correct terminals and with correct
polarization.
When connecting the plus and minus
poles of a string make sure to choose
the correct connection!