Connecting External Sources SMA Solar Technology AG
142 SI2012_2224-TEN082311 Technical Description
The Sunny Island burdens the generator at each phase with the current defined in the parameter
"233.03 GnCurNom". The power not directly used by the loads flows into the battery for charging.
At the same time, the limits for the AC charging current limit ("210.02 InvChrgCurMax" parameter)
on the Sunny Island and the DC charging current limit ("222.01 BatChrgCurMax" parameter) are
active.
Low values for these limits may be the reason why the defined generator current cannot be adjusted.
If the battery voltage reaches the charging voltage nominal value, it is also reduced (absorption
phase, see section 12.4 "Charge Control" (Page 122)).
If the "233.15 GnCtlMod" parameter is set to CurFrq, the generator is also limited at frequencies
lower than the nominal frequency ("233.04 GnFrqNom" parameter). This function can be used if
the full generator output is not always available and you want to prevent the generator from being
overloaded. The default setting is only intended to control the nominal generator current.
If the current set using the "233.03 GnCurNom" parameter is not sufficient for powering the loads,
the battery provides support ("real generator support").
The Sunny Island provides all the required reactive power.
Information
If the master device disconnects the generator, all slave devices are disconnected as well.
Information
If a slave device is disconnected from a generator (and the master continues to be
connected to the generator), the slave device can reconnect once the voltage and
frequency are within the valid range again.
There is, however, a monitoring period in this case. Only after voltage and frequency are
determined to be valid according to the "233.12 GnWarmTm" parameter does
reconnection take place.
Information
A sensible value for the "233.03 GnCurNom" parameter is approximately 80 % of the
maximum generator current for each phase.
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