SMA SB 3300TL - Manual (Page 18)

Device Description SMA Technologie AG
Page 14 SB3300TL-11:FE1905 Operating Instructions
Derating
The operating state „Derating“ can have several causes:
• The temperature monitoring of the Sunny Boy 3300TL has reduced the output
power to prevent the device from overheating. If this happens often, heat dissipa-
tion might be insufficient. In order to avoid unnecessary yield losses, it should be
checked if the Sunny Boy 3300TL can be mounted at a more appropriate place
with better ventilation.
• The input power is too high and the Sunny Boy 3300TL is operating at its operat-
ing limits.
• The current from one of the strings is about to exceed 8 A and the Sunny Boy
3300TL reduces this current to 8 A in order to prevent any damage.
Insulation Failure
The red LED on the Sunny Boy
3300TL is on, which indicates an
earth fault.
Please contact a qualified electrician who will remove the fail-
ure. For further information see the „Installation Guide“.
1 s
Green LED is shortly
off once per second
Green LED is blinking
once per second
Red LED is
permanently on