SMA SB 1100LV - Manual (Page 26)

Installation SMA Technologie AG
Page 26 SB1100LV-11:SE2006 Installation Guide
6.2.2 PV string (DC) connection
To connect up the input, follow these steps:
1. Make sure the PV generator connectors have the
right polarity and do not exceed the maximum
string voltage of 60 V (DC). See also chapter
5.2 "PV generator requirements" (Page 15).
Warning!
Dangerous high voltages may be present. Danger of death!
2. Taking one DC plug connector at a time,
measure the direct current voltage between one
DC connection of a string and earth potential.
3. If the measured voltages are constant and if their
total is roughly the same as the open circuit
voltage of the string, then there is an ground fault
in this string. Its approximate location can be
deduced from the relationships between the
voltages.
Attention!
Do not connect strings to the Sunny Boy SB 1100LV that contain a ground
fault until you have fixed the earth fault in the PV generator.
4. Repeat points 2 and 3 for each string.
5. Open the Sunny Boy as described in chapter 7.1
"Opening the Sunny Boy" (Page 33).