Sunny Boy SWR 2500U Installation And Operator's Manual page 33

Sunny Boy 2500U
Blinking Code 3: Grid impedance too high (if the optional Grid Impedance Meas-
urement is active)
Operation
Earth Fault
Failure
5 s
The yellow failure LED is activated for 5 seconds, remains dark for 3 seconds and then
blinks three times. The code is sent three times.
If the failure persists the indication begins once again.
The Sunny Boy has detected a failure based on the utility impedance values. The criteria
for the grid impedance is described in the section "Islanding protection" in the technical
description of the Sunny Boy.
A too high utility impedance can be the reason should this failure occur very often. The
impedance can be checked with the Sunny Boy Control or Sunny Data. This failure can
normally be avoided by increasing the cross section of the AC-cabling.
SB2500U-11:NE
http://www.wholesalesolar.com/inverters.html
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Installation and Operator's Manual
SMA Regelsysteme GmbH