About Huawei SUN2000 inverter device storage, which of the following description is correct? (Multiple choice)
A . Do not remove the outer packaging of the inverter
B . The stored temperature should be kept at -40 degree Centigrade ~ +70 degree Centigrade: the relative humidity should be kept at 5% RH~100% R
D . Store in a clean and dry place and prevent dust and moisture
E . The maximum stackable size is 4 layers.
F . Periodic inspection is required during storage. If you find a bite of a worm, you need to replace the packaging materials in time.
G . After long-term storage, the inverter must be inspected and tested by professionals before it can be put into use.
Answer: ABCDEF