Fronius Energy Package - Manual (Page 97)

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Once calibration is complete, the system automatically reverts to the operating mode that
was set originally.
This calibration charging process is also performed automatically during actual operation
after a number of charging and discharging cycles.
If the “battery charging from UC grid” setting is deactivated, this calibration charging pro-
cess relies exclusively on energy from the photovoltaic system. Depending on the insola-
tion conditions and size of the systems concerned, the charging process can take a very
long time.
If the “battery charging from UC grid” setting is activated, the calibration charging process
is performed by drawing a constant current from the photovoltaic system and utility com-
pany grid.