GREE Photovoltaic Direct-driven Inverter Multi VRF Units
298
1) Use dry or damp soft and clean cloth to wipe the surface. Never use corrosive dissolvant or a
hard object to wipe the surface.
2) Clean when the irradiant is lower than 200W/m
2
and do not use liquid whose temperature varies
too much from the parts.
3) Never clean the parts when wind scale is greater than 4 or when there is heavy rain or heavy
snow.
2 Photo-voltaic parts should be inspected regularly. If one or more of the following problems are
found, please adjust or replace the parts immediately.
1) There is broken glass, burnt back board or obvious color difference.
2) There is bubble forming passage between the edge of photo-voltaic parts and electric circuit.
3) The junction box of photo-voltaic parts is deformed, distorted, cracked or burnt. Wiring terminals
can’t contact normally.
3 Electric warning labels of the parts must be complete.
4 If the photo-voltaic parts use metal frames, frames and bearer must be well joined. Contact
resistance between them should not be larger than 4Ω.
5 If the photo-voltaic parts use metal frames, the frames must be securely grounded.
6 When units are not working in the shade and solar irradiance is greater than 500W/m
2
with wind
speed not faster than 2m/s, temperature difference of the surface of the same photo-voltaic part (right
above the cell) should be smaller than 20℃. If the installed capacity of the photo-voltaic station is larger
than 50kWp, infrared ray thermal imager should be equipped in order to detect temperature difference of
the surface of photo-voltaic parts.
7 Under the condition that solar irradiance is almost the same, use DC forcipate ammeter to
measure the current input of each photo-voltaic parts series that connect to a same DC combining box.
Deviation should not exceed 5%.
3.5.1.2 Maintenance of bearer
Maintenance of bearer should comply with the following requirements:
1 All the bolts, welded seams and bearer connecting parts should be securely fastened.
2 The anti-corrosive coating of the bearer should not have cracks or peel away. Otherwise, brush
the coating in time.
3.5.2Photovoltaic Anti-lightning Combining Box
Operation and maintenance of combining box should comply with the following requirements:
1 Combining box must not have distortion, rust, water leak or dust. Safety warning labels on the
outside of the box must be complete and fine. The waterproof lock on the box should be able to switch
easily.
2 Each wiring terminal of the combining box must not be loose or corroded.
3 Specifications of the high pressure DC fuse of the combining box must comply with the design
requirement.
4 Insulation resistance of positive pole to ground and negative pole to ground of the output bus
should be larger than 2MΩ.
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