SMA America, LLC
Commissioning
Installation Guide
SB50US-80US-eng-IUS112633
61
7 Commissioning
All Sunny Boy inverters have a system for detecting ground fault errors in the PV array (GFDI)
according to the
National Electrical Code
690.5.
The PV array is operated in a grounded configuration. Depending on the plant type, the negative or
positive conductor of the PV array is connected to the grounding system in the Sunny Boy. According
to UL 1741, the GFDI protection is always active when sufficient DC voltage is present to switch on
the LC display in the Sunny Boy.
1. Remove all covers from the PV array.
2. Switch on the AC main conductor breaker.
3. Turn the SMA DC Disconnect to position "1"
or
switch on the external DC disconnect switch.
☑ If there is sufficient sunlight: The Sunny Boy goes into "Wait" mode and the green LED flashes.
"Wait" mode ends after 10 seconds. The green LED lights up permanently and the Sunny Boy
feeds into the power distribution grid.
or
☑ The Sunny Boy waits for 5 minutes before feeding into the power distribution grid.
DANGER
High voltages in the PV plant when exposed to sunlight.
Risk of death or serious injuries due to incorrect commissioning.
• Only commission the Sunny Boy in the following order described.
• Never insert the GFDI fuse into the Sunny Boy without a fuse holder.
If the feed-in to the power distribution grid was interrupted and then resumed, the inverter
always waits 5 minutes before feeding in.
If the inverter is not able to feed into power distribution grid three times in a row, it waits
10 minutes before the next attempt.
This interruption can be caused not only by an AC fault being detected, but it can also be
caused manually.
In the event of inverter inspection:
• First, disconnect the DC side.
• Switch off the Sunny Boy, then disconnect the AC side.
