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Designing an Off-Grid System
Procedure
Estimating the Electrical Loads
Sunny Island and Multicluster-Box Design
Battery-Storage System Design
PV System Design
Generator Design
Estimating the PV System Costs
Planning Tools
Procedure
Table of Contents
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Off-Grid Energy Supply
Necessity for an Off-Grid Energy Supply
Off-Grid Systems
Off-Grid System Types
AC Coupled Off-Grid Systems
DC Coupled Off-Grid Systems
Hybrid AC and DC Coupled Off-Grid Systems
Off-Grid System with Sunny Island
Working Principle of the Sunny Island Inverter
Advantages of the Sunny Island Inverter
Modular Design
Single System
Single-Cluster System (Single-Phase)
Single-Cluster System (Three-Phase)
Multicluster System
Designing an Off-Grid System
Procedure
Estimating the Electrical Loads
Sunny Island and Multicluster-Box Design
Recommendations on the Selection of Sunny Island / Multicluster-Box
Sunny Island Inverter Selection
Multicluster-Box Selection
Battery-Storage System Design
PV System Design
Estimation of the Nominal PV System Power
Selecting the PV Inverter
Generator Design
Estimating the PV System Costs
Planning Tools
Data Gathering with the Off-Grid Questionnaire
PV System Design with Sunny Design
Example of a Design of an Off-Grid System without Software
Visualization in Sunny Portal powered by ennexOS
Appendix
Accessories
Additional Sunny Island Inverter Functions in the Off-Grid System
Grid- and Generator Management
Typical External Energy Sources
Synchronization of the Stand-Alone Grid with External Energy Sources
Interactions between External Energy Sources and the Stand-Alone Grid
Load Control
Overload Capacity
Load Shedding
Frequency Shift Power Control
Control and Monitoring via Internal Multifunction Relay
Operation and User Guide
Data Recording and Data Storage
Further Information on Battery Management for Lead-Acid Batteries
Advantages of Battery Management
Battery State
Nominal Capacity and Battery Aging
Current State of Charge
Current Usable Battery Capacity
Battery Temperature
Charging Phases
Charging Processes
Automatic Temperature Compensation
Battery Protection Mode
Further information on Generator Management
Generator Management Tasks
Generator Request Dependencies
Electrical Generator Thresholds
Generator Run Times
Generator Operating Modes
Operating Procedure for Generator Control
Operating Procedure with Generators with Autostart Function
Operating Procedure with Generators without an Autostart Function
Operating Procedure with Generators with External Generator Control
Further Information on the Grid Management Service
Tasks of the Grid Management Service
Dependencies for Requesting the Utility Grid
Electrical Thresholds for the Utility Grid
Operating Modes of the Utility Grid
Operating Procedure for Grid Control
Grid-Connected Systems in Off-Grid Mode
Systems with utility grid as an energy reserve for the battery-storage system
Systems with utility grid as a main supplier of loads
Systems with utility grid as a main supplier of loads and diesel generator as energy reserve in case of a grid failure
Further Information on Clusters
Mixed multicluster systems
Multicluster Boxes
Sunny Island battery inverter within mixed multicluster systems
