Fronius String Control 100/12 Operating Instructions Manual page 72

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NOTE! Note the following points when connecting:
- Is a solar module ground required or present?
If yes, keep in mind the special features of the relevant solar module ground
- If there is a solar module ground present, Fronius recommends that you al-
ways insert string fuses into the non-grounded branch.
- Connect the DC cable 'OUT' to the inverter with the correct polarity