SMA Solar Technology AG
Maintenance and Cleaning
Installation Guide
SB3300TLHC-IEN094121
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8 Maintenance and Cleaning
Check the correct operation of the Sunny Boy at regular intervals.
Impurities such as dust or airborne blossoms can cause heat concentration that can lead to yield
losses. Also check the Sunny Boy and the cables for visible external damage. Undertake repairs if
necessary.
8.1 Cleaning the Cooling Fins
The heat dissipation of the product can be restricted by unclean cooling fins.
• Clean the cooling fins with a suitable, soft brush.
8.2 Check the Electronic Solar Switch for wear
To check the Electronic Solar Switch for wear, proceed as follows:
1. Remove the Electronic Solar Switch.
2. Check whether metal tongues inside the connector have a brown discoloration or are burned
off.
☑ If all metal tongues are in acceptable condition (as illustrated above), the Electronic Solar
Switch can continue to be used.
☑ If at least one of the metal tongues has a brown discoloration or is completely burned off
(as illustrated below), proper functioning of the Electronic Solar Switch is no longer
guaranteed.
3. Replace the defective Electronic Solar Switch, before you re-commission the Sunny Boy. You
can purchase replacements from SMA Solar Technology (see section 12 ”Accessories”
(page 39)).
Metal tongues
worn-out metal
tongues
