SMA SB 2800i - Manual (Page 13)

Operating Instructions Device Description
SB2800i-11:FE0504 SMA Regelsysteme GmbH 11
3.3.1 Normal Operating States
As long as no LEDs or only the green LED is on blinking, the Sunny
Boy 2800i is in one of its normal operating states. If all three LEDs
are on, the inverter is in its initialization phase which is a normal
operating state as well. All other signals indicate a disturbed
operating state.