SMA Solar Technology America LLC
2 Configuration of PV Inverters in Off-Grid Systems
Technical Information
SB-OffGrid-TI-US-en-19
3
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.
PV Inverters
Off-grid system
battery-backup
system
Available?
Sunny Tripower (STP)
STP 12000TL-US-10
✖
✖
Yes
STP 15000TL-US-10
✖
✖
Yes
STP 20000TL-US-10
✖
✖
Yes
STP 24000TL-US-10
✖
✖
Yes
STP 30000TL-US-10
✖
✖
Yes
✓ Compatible
✖ Not compatible
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.
Parameter name
Value
Default
or
CntrySet
Off-Grid
or
depending on power frequency,
OFF-Grid50
for 50 Hz power frequency or
Off-Grid60
for 60 Hz power frequency
