7 Commissioning
SMA Solar Technology AG
Operating manual
SI44M-80H-13-BE-en-15
74
Parameter
Explanation
Time until interrupting the equalization
charge for lithium-ion batteries
If neither SOC range 1 nor SOC range 2 could be completed within
the time specified by this parameter, the equalization charge is inter-
rupted. In this case, the event message
Equalization charge
inter-
rupted appears.
Equalization charge cycle time
When the time specified by this parameter has elapsed, the Sunny Is-
land will again attempt to perform an equalization charge.
Procedure:
1. Select
Battery > Charge
.
2. Click the
On
button to activate
Automatic equalization charge
.
3. Click the
Off
button to deactivate
Automatic equalization charge
.
4. If automatic equalization charge is activated, set the following parameters:
Time to complete equalization
charge in SOC range 1
,
Time to complete equalization charge in SOC range 2
,
Time to abort
equalization charge for lithium-ion batteries
and
Cycle time for equalization charge
.
7.6.4
Battery Use Regarding Systems for Increased Self-Consumption
7.6.4.1
Seasonal Adjustment of the Battery Usage
Relevant for systems connected to the utility grid
The options for increased self-consumption depend to a large extent on the battery and on the availability of PV
energy.
In many regions, the PV energy available largely depends on the season and the hours of sunshine. On short days with
few hours of sunlight, the Sunny Island cannot charge the battery fully. Lead-acid batteries in particular age faster due
to low charging over a long period. Therefore, it is better if the battery is not discharged too much by the Sunny Island
on short days. On long days with many hours of sunlight, the Sunny Island can usually charge the battery fully. On
such days, it is better to use as much of the battery capacity as possible for increasing self-consumption.
The discharge behavior can be adjusted to the location and time by the Sunny Island. Furthermore, you can set a
seasonal adjustment (
Battery > Ranges of application > Season operation active
). The Sunny Island only uses a
small portion of battery capacity for increased self-consumption on short days when adjustment is activated. The
Sunny Island uses a large portion of the battery capacity for the increased self-consumption on long days. The
seasonal adjustment prolongs the electrical endurance of the battery in regions where the available PV energy is
largely dependent on the season.
7.6.4.2
Changing the Battery Usage Regarding Systems for Increased Self-
Consumption Without a Battery Backup Grid
Relevant for systems connected to the utility grid
Ranges for battery use:
In systems for increased self-consumption, 1 range can be adjusted seasonally:
• Increased self-consumption range (SlfCsmp)
You determine the percentage of the battery capacity that is to be used for increased self-consumption on the
shortest day of the year.
