Sungrow SG33CX User Manual page 24

3 Unpacking and Storage

The storage temperature should be always between -40° C and +70° C, and
the storage relative humidity should be always between 0 and 95 %,
non-condensing.

In case of stacking storage, the number of stacking layers should never
exceed the limit marked on the outer side of the packing case.

The packing case should be upright.
If the inverter has been stored more than half a year, the qualified personnel
should thoroughly check and test it before using.
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User Manual
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