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If string fuses are used instead of the metal slugs, the reverse polarity of an individual solar
module string can cause damage to the inverter and cause an inverter fire.
Overview ‘Connecting Solar Module Strings to the Fronius IG Plus (DC)’ includes the following sec-
tions:
- Ungrounded System: Connecting Solar Module Strings
- Criteria for the Proper Selection of String Fuses
- Ungrounded System: Connecting Solar Module Strings with a Cable Cross Section >
16 mm²
- Solar Module Ground at Negative Pole: Connecting Solar Module Strings
- Criteria for the Proper Selection of String Fuses
- Solar Module Ground at Negative Pole: Connecting Solar Module Strings with a Cable
Cross Section > 16 mm²
- Solar Module Ground at Negative Pole for Fronius IG Plus
- Solar Module Ground at Positive Pole: Connecting Solar Module Strings
- Criteria for the Proper Selection of String Fuses
- Solar Module Ground at Positive Pole: Connecting Solar Module Strings with a Cable
Cross Section > 16 mm²
- Solar Module Ground at Positive Pole for Fronius IG Plus
CAUTION! However, there is a risk of damage and fire to the inverter due to re-
verse polarity of a solar module string when the metal slugs are used.
The reverse polarity of a solar module string can cause an unacceptable thermal
load, which can lead to an inverter fire.
When using metal slugs, always make sure that the polarity is correct before con-
necting the individual solar module strings.
CAUTION! Risk of damage and fire to inverter due to reverse polarity of solar
module strings when using string fuses.
Reverse polarity of solar module strings can lead to an unacceptable overload to
a string fuse being used. This can cause a strong arc, which can lead to an invert-
er fire.
When using string fuses, always make sure that the polarity is correct before con-
necting the individual solar module strings.
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