Configuration Of Pv Inverters In Off-Grid Systems - SMA Sunny Boy Series Technical Information

SMA Solar Technology America LLC
PV Inverters
Sunny Tripower (STP)
STP 12000TL-US-10
STP 15000TL-US-10
STP 20000TL-US-10
STP 24000TL-US-10
STP 30000TL-US-10
System failures due to excessive power output of AC sources in the stand-alone grid
If the power of the AC sources (e.g. PV inverters) in off-grid systems or battery-backup systems is too high, it may
cause system failures.
• Design the total nominal AC power of the PV inverters to be no more than twice as high as the nominal AC
power of the Sunny Island.
• If wind power inverters feed into the stand-alone grid, design the total nominal power of the AC sources in the
stand-alone grid to be no larger than the nominal AC power of the Sunny Island.
• Allow at least 100 Ah of battery capacity per 1000 W of nominal AC power from the AC sources in the
stand-alone grid.

2 Configuration of PV Inverters in Off-Grid Systems

The country data set must be set to stand-alone mode in off-grid systems.
You can order PV inverters configured for stand-alone mode or you can configure existing PV inverters for stand-alone
mode (see Section 4 "Communication Products for Configuring PV Inverters", page 5). During the first ten operating hours
you can adjust the country data set for many PV inverters by means of rotary switches (see the manual of the PV inverter).
Setting the Country Data Set via RS485
The following table shows how the country data set must be set during configuration of the PV inverter via RS485.
The parameter name and the configurable value depend on the PV inverter and the communication product in use.
Parameter name
Default
or
CntrySet
Technical Information
Off-grid system
✖
✖
✖
✖
✖
Value
Off-Grid
or
depending on power frequency, OFF-Grid50 for 50 Hz power frequency or
Off-Grid60 for 60 Hz power frequency
2 Configuration of PV Inverters in Off-Grid Systems
battery-backup
system
✖
✖
✖
✖
✖
✓ Compatible
SB-OffGrid-TI-US-en-19
Available?
Yes
Yes
Yes
Yes
Yes
✖ Not compatible
3