Fronius Primo GEN24 3.0 Plus Operating Instructions Manual page 30

Risk of polarity reversal at the terminals due to improper connection of external
power supplies.
This may result in severe damage to the inverter.
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IMPORTANT!
If the total output (6 W) is exceeded, the inverter switches off the entire external power
supply.
(1)
30
CAUTION!
Check the polarity of the external power supply with a suitable measuring device
before connecting it.
Connect the cables to the V+/GND outputs with the correct polarity.
Power limitation