SMA SI 4548-US - Manual (Page 123)

SMA America, LLC 14 Connecting External Sources
Operating Manual SI4548-6048-US-BE-en-20 123
The time periods t1 and t2 are defined using the parameters "235.07 GnTm1Str" and
"235.08 GnTm2Str". The start time for t1 (and thus the end of t2) is defined using GnTm1Str, and the
start time for t2 (end of t1) is defined using GnTm2Str.
The time intervals t1 and t2 are assigned charge states for start-up and stop with the parameters
"235.03 GnSocTm1Str", "235.04 GnSocTm1Stp", "235.05 GnSocTm2Str" and
"235.06 GnSocTm2Stp". GnSocTm1Str designates the battery state of charge at which the generator
is started during the t1 time and GnSocTm1Stp designates the state of charge at which the generator
is switched off during t1. The GnSocTm2Str and GnSocTm2Stp parameters are similarly defined
during the time t2.
The following figure shows an example of the settings if operation of the generator at night is to be
avoided as much as possible. From 6 a.m. to 10 p.m., the generator is activated at a state of charge
(SOC) of 40%, at night (from 10 p.m. to 6 a.m.), however, the state of charge of the battery is allowed
to drop to 30% before the diesel generator is activated.
Charge State Dependent Start
The Sunny Island changes to the operating mode "Stop/Lock" when stopped manually during
automatic operation.
• Manual inputs on the Sunny Island have a higher priority than automatic operation.
• If the Sunny Island is manually stopped while the automatic operating mode is activated,
it switches to stop/lock operating mode.
• If generator automatic start is activated and the conditions for automatic operation are
met, the Sunny Island changes back into the operating mode "Start" after lock time (or
manual acknowledgment with the parameter "540.02 GnAck").
GnTm1Str = GnTm2Str
If GnTm1Str = GnTm2Str, only t1 is activated!