Battery Usage Through Systems For Increased Self-Consumption; Seasonal Adjustment Of The Battery Usage; Changing The Battery Usage Through Systems For Increased Self-Consumption Without A Battery-Backup Function - SMA SUNNY ISLAND 3.0M Installation Manual

SMA Solar Technology AG
Parameter
Minimum width of the battery-backup range /
262.03 BUResSOC
Seasonal operation active / 261.03 Saisonenable
8.2.4

Battery Usage through Systems for Increased Self-Consumption

8.2.4.1

Seasonal Adjustment of the Battery Usage

The options for increased self-consumption depend to a large extent on the battery and on the availability of PV energy.
In order to use the battery optimally, you can adjust the depth of discharge of the battery to the application.
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 short days, there is insufficient PV energy to charge the battery. 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. You can activate seasonal
adjustment for this (parameter Seasonal operation active / 261.03 Saisonenable). 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.
8.2.4.2 Changing the Battery Usage through Systems for Increased
Self-Consumption without a Battery-Backup Function
Adjusting the default values
The parameters for battery usage are set automatically to reasonable values during basic configuration for the
respective system. The parameter values can be adjusted if there are special requirements for the system or the
battery.
In systems for increased self-consumption, one 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.
The longer the days become, the more the SlfCsmp range increases automatically and the range for protection against
deep discharge (BatRes) decreases. The range for increased self-consumption reaches its maximum on the longest day:
SlfCsmp = 100% − 262.04 PVResSOC − 262.02 BatResSOC − 262.01 ProtResSOC
max
This results in the seasonal progression of the ranges.
Installation manual
Value
If all ranges combined do not amount
to 100%, the BuRes range will be
increased automatically.
No
SI30M-44M-60H-80H-IA-en-32
8 Commissioning
75