SMA Solar Technology AG Maintenance and Cleaning
Installation Guide SB33_38-IEN111851 47
8 Maintenance and Cleaning
Check the correct operation of the inverter at regular intervals. Impurities such as dust or airborne
blossoms can cause heat concentration that can lead to yield losses. Also check the inverter and the
cables for visible external damage. Undertake repairs if necessary.
8.1 Checking Heat Dissipation
You only need to check the heat dissipation of the inverter if, during a visual inspection, you notice a
marked build-up in the fan screen or the inverter is increasingly observed to be in derating mode.
Whether the inverter switches to derating mode depends on the ambient temperature and cooling
efficiency.
8.1.1 Cleaning the Fan
If the fan screen is only covered in loose dust it can be cleaned with a vacuum cleaner. If you do not
achieve satisfactory results with a vacuum cleaner, dismantle the fans for cleaning.
Proceed as follows:
1. Disconnect the inverter from both the DC and AC connections, as described in section
7.2”Opening the Inverter” (page43).
2. Wait for the fan to stop rotating.
Cleaning the Fan Screen
3. Remove the fan screen:
– Press both latches on the right of the fan screen
to the right using a screwdriver and loosen from
the bracket.
– Carefully remove the fan screen.
4. Clean the fan screen with a soft brush, a paint
brush, a cloth or pressurized air.
Cleaning the Fan
5. Push the two upper latches backward and the
lower latch forward.
6. Remove the fan by pulling it slowly and carefully
downward.
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