SMA SUNNY BOY 2500, Installation Manual

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SMA Technologie AG Replacing the varistors
Installation Guide SB2500-11:SE2006 Page 37
If no ground contact and no defective varistor were found, there is probably a fault
in the Sunny Boy. In this case, contact the SMA hotline to discuss what to do next.
In case there are no spare varistors available the Sunny Boy 2500
still can feed electricity into the grid. The input is not protected
against overvoltages in this case. Replacement varistors should be
obtained as soon as possible. In system with a high risk of
overvoltages, the Sunny Boy 2500 should not be operated with
defective varistors.
9. Reconnect the PE connection on the lid and close the Sunny Boy 2500.
10. Connect up the faultless PV generator strings to
the inverter.
11. Close off the unneeded DC input sockets using
the protective caps supplied in the accessories
kit.
12. Switch the line circuit breaker to the „on“
position.
13. Now check whether the LED display on the
Sunny Boy 2500 indicates that the device is
functioning correctly.
+ - + -
String 1
String 2
-
String 3
+