DANGER!
Electric shock caused by high voltage in the inverter. 
Even when no external voltage is present, there can still be high voltages in the device. 
The following work may be carried out by qualied personnel only:
• Electrical installation
• Repairs
• Modication
CAUTION!    
Risk of injury from touching the enclosure during operation. 
Burns to the body.
• Only touch lid and display during operation.
NOTICE!
Overvoltage in the inverter if yellow LED ashes 4 times.
Destruction of the inverter.
• Inform your installer immediately if the yellow LED starts  
ashing and the following display message appears.
Operation
The display shows current values of your system. The displayed values 
are updated every 5 seconds. The display is operated by tapping on it.
Tap once
The backlight is switched on. After 2 minutes, the illumination switches 
off automatically.
Tap again
The display switches to the next notication.
Display messages
Operation
Upon error-free connection of the inverter to the grid, the following 
messages are shown in turn after approximately 1 minute. Each 
message appears for 5 seconds, then the cycle starts again.
Power produced on the current day 
Operating state
Current feed-in power 
PV generator voltage
Power produced so far 
Total number of grid-feeding operational hours
Disturbance
In the event of a disturbance, the inverter will display the status 
"Disturbance" and an error message. Please inform your installer. 
The following messages will be issued:
Power produced on the current day 
Operating state "Disturbance"
Operating state 
Error message
Measured value at time of disturbance 
Current measured value (only displayed if a measured value is 
responsible for the disturbance)
DC overvoltage
The DC input voltage connected to the inverter is too high. 
Please inform your installer immediately.
State Description Function
All LEDs are onInitialization The inverter is initializing. 
All LEDs are 
off
Deactivation The inverter has detected a DC input voltage that is 
too low for grid feeding. 
Green 
LED is 
permanently 
on
Feeding 
Operation
The inverter is feeding power into the public grid.
Green LED 
is ashing
Waiting, Grid 
Monitoring
The inverter monitors the grid and waits for the DC 
voltage to reach a certain level so that it can start 
feeding the grid.
Stop Interruption of operation.
Derating Overtemperature in the inverter.
Red LED is 
glowing
Warning A grounding error has occurred, or one of the 
thermally monitored varistors on the DC input side is 
defective. Please inform your installer.
Yellow LED 
is glowing 
continuously
Disturbance The inverter is operating in "Operation constantly 
disabled" mode. This can have several causes. 
Please inform your installer.
Yellow LED 
is ashing
Disturbance The inverter displays a disturbance. This can have 
several causes. Please inform your installer.
If your inverter is equipped with a communication component, then numerous measuring channels 
and messages can be transmitted for diagnosis.
Measuring channel Description
Error Identication of the current disturbance / error.
E-total Total amount of feeding-in energy
Event-Cnt Number of events that have occurred
Fac Grid frequency
h-On Total number of operating hours
h-total Total number of grid-feeding operational hours
Iac Grid current
Ipv DC current
Mode Display of the current operating mode
Pac Generated AC power
Power On Total number of grid switch-ons
Riso Insulation resistance of the PV system to the power supply line
Serial number Inverter serial number
Vac Grid voltage
Vpv PV input voltage
Vpv-Setpoint PV target voltage
Your inverter can be in various operating modes. These are displayed as status messages, which can 
vary according to the method of communication.
Message Description
Derating Overtemperature in the inverter. The inverter will reduce its output to prevent 
overheating. To avoid unnecessary output losses, the design of the PV plant 
should be checked. Please inform your installer.
Disturbance Disturbance. This message appears for reasons of safety and prevents the 
inverter from connecting to the grid. Please inform your installer.
Error An error has been detected. Please inform your installer.
grid mon. Grid monitoring
This message appears during the startup phase, before the inverter connects to 
the grid; it usually appears in the morning and evening when there is little solar 
irradiation an after an error has occurred.
MPP The inverter is operating in MPP mode. MPP is the standard display message 
when operating under normal irradiation conditions.
Off Grid The inverter is in "Island" mode. This mode has been specially conceived for 
operation in an off-grid power system with a Sunny Island as grid controller.
offset Offset adjustment of measurement electronics.
Riso Measurement of the insulation resistance of the PV system.
Stop Interruption of operation.
V-Const Constant voltage operation.
waiting The switch-on conditions are not (yet) fullled.
LED MODES
SAFETY PRECAUTIONS PRODUCT OVERVIEW
Cooling ns
Enclosure lid
Display
LEDs
Serial number
Identication of the Sunny Boy by the type label
Operation
Ground fault or varistor defective
Disturbance
DISPLAY
STATUS MESSAGESMEASURING CHANNELS