Changing the Battery Usage Regarding Battery-Backup Systems without Increased Self-Consumption
Qualified person
Ranges for battery use:
State of charge ranges of the battery according to the time of year (example)
Range | Explanation of the range and parameters | Behavior of the Sunny Island inverter |
|---|---|---|
A | Backup power range (BuRes) | The Sunny Island uses this range for supplying the battery-backup grid when the utility grid fails. When the utility grid is available again, the battery is charged by the Sunny Island with nominal power from the utility grid. |
Battery > Ranges of application > Minimum width of backup power range | ||
B | Deep discharge protection range (BatRes) This range can only be reached when the utility grid fails. | The Sunny Island is switching to energy-saving mode. The Sunny Island starts up every 2 hours and attempts to charge the battery with PV energy. If the battery cannot be charged, the Sunny Island switches back to energy-saving mode. When the utility grid is available again, the battery is charged by the Sunny Island with nominal power from the utility grid. |
Battery > Ranges of application > Minimum width of deep discharge protection range | ||
C | Deep discharge range (ProtRes) This range can only be reached when the utility grid fails. | When this range is reached, the Sunny Island switches off in order to protect the battery. When the utility grid is available again, the system must be charged manually ( > Emergency charge mode after automatic shutdown). |
Battery > Ranges of application > Lower lmt deep disch. protect range prior shutdown (Limit between BuRes and BatRes) |
The following ranges result from the parameter default values:
Range | Lead-acid battery | Lithium-ion battery |
|---|---|---|
Backup power range | 15% to 100% | 13% to 100% |
Deep discharge protection range | 10% to 15% | 3% to 13% |
Deep discharge range | 0% to 10% | 0% to 3% |
Parameters for battery use:
Parameter | Value |
|---|---|
Rise in self-consumption switched on | Yes |
Lower lmt deep disch. protect range prior shutdown | Range for protection during deep discharge as a percentage of the battery capacity |
Minimum width of deep discharge protection range | Range for protection against deep discharge as a percentage of the battery capacity Within this range, the system goes into energy-saving mode and automatically attempts to recharge the battery from available PV energy. |
Minimum width of backup power range | Range for battery-backup function If all ranges combined do not amount to 100%, the BuRes range will be increased automatically. |
Season operation active | No |
Procedure for multicluster systems with battery-backup grid
All systems for which VDE-AR-N 4105-11:2018, EN50549-1:2018, C10/11:2019, G98-1:2018, G99-1:2018, CEI 0-21:2019 type A/type B, TOR generator type A of the European grid connection regulations according to Regulation (EU) 2016/631 are subject shall not be set up as multicluster systems.
Multicluster systems with battery-backup grid can be set up with the Multicluster-Box 12 (MC-Box-12.3-20) and the Grid-Connect-Box (see documentation of the Multicluster-Box and Grid-Connect-Box). When doing so, always perform the following steps:
- In a multicluster system with battery-backup grid and increased self-consumption, set the ranges of battery state of charge for each cluster to the same values.
- In a multicluster system with battery-backup grid and without increased self-consumption, always set the Internal consumption increase switched on parameter to No.
If the values for the battery usage ranges are incorrect, no adjustment is possible
If all battery usage ranges combined exceed 100%, the parameters for battery usage cannot be set.
- Ensure that all battery usage ranges combined result in the value 100%.
The basic procedure for changing operating parameters is explained in another section ( > Changing Operating Parameters).
Procedure:
- Select Battery > Ranges of application.
- Set the parameters for battery use.