TECHNICAL BULLETIN REGARDING OVERSIZING OF
FRONIUS IG PLUS ADVANCED STRINGINVERTERS
Fronius International GmbH
hereby confirms that the inverters
Wels, May 12th 2016
/ Fronius IG Plus A 3.0-1
Fronius IG Plus A 5.0-1
Fronius IG Plus A 7.5-1
Fronius IG Plus A 10.0-3
Fronius IG Plus A 3.8-1
UNI
Fronius IG Plus A 6.0-1
UNI
Fronius IG Plus A 10.0-1
UNI
Delta
UNI
UNI
UNI
can be oversized 50% above the rated nameplate capacity without voiding the manufacturer’s warranty,
/ Fronius IG Plus A 11.4-1
Fronius IG Plus A 11.4-3
UNI
Delta
can be oversized 32% above the rated nameplate capacity without voiding the manufacturer’s warranty,
/ Fronius IG Plus A 12.0-3
WYE277
can be oversized 25% above the rated nameplate capacity without voiding the manufacturer’s warranty,
always provided that
/ String configuration adheres to the voltage and current window guidelines published in the operation manual
/ The open circuit voltage of a module string does not exceed 600V; excess voltage above this threshold will
damage the inverter and negate the standard terms of warranty
/ The maximum DC array short circuit current shall not exceed the limit as stated in the inverter datasheet
/ Reverse polarity of solar module strings can lead to an unacceptable overload condition. This can cause a strong
arc, which can lead to an inverter fire. When using string fuses or combiner DC bus bars, always make sure that
the polarity is correct before connecting the individual solar module strings.
Fronius International GmbH
Solar Energy Division
Froniusplatz 1
A-4600 Wels
DI Thomas Mühlberger
Head of Solution Management
02/2017
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