Off Grid Solar system using a Sungrow inverter and battery
Single Phase Sungrow Hybrid Inverters are now supported for use off-grid with generator backup.
Sungrow has just added a new feature to their Sungrow SHRS inverters. Now, they are available to be used in an off the grid situation with a backup generator to charge batteries when there isn’t enough solar power to fill the batteries.
Supported Inverter Models
The off-grid feature is supported by the following single-phase hybrid inverter models:
- Sungrow 5kW Inverter – SH5.0RS
- Sungrow 6kW Inverter – SH6.0RS
- Sungrow 8kW Inverter- SH8.0RS – ETA Q4 2023 – Australia
- Sungrow 10kW Inverter – SH10.0RS – ETA September 2023 – Australia
Note: Three Phase SHxxRT inverters are also capable of running off grid, however do not support a generator connection at this point.
Design Considerations for Off-Grid Installations
Off-grid installations require careful design. Below is a basic SLD of electrical wiring
Key design aspects include:
1. Inverter Power Output
Ensure there is enough peak and continuous inverter output power available to meet the load demands at the site.
2. Battery Storage Sizing
The battery storage must also be sized to meet energy requirements during periods when there is insufficient solar power available (night time and inclement weather)
3. PV Array Sizing
The PV array must be sized to supply power for the loads during the day with excess available to charge the battery bank. These calculations should be based on the worst-case scenario insolation during the year, generally during the winter solstice for most locations in Australia.
Backup Generator Integration
For periods of low insolation, the inverter can also be used with a 2-wire auto-start backup generator to charge the batteries where there is insufficient sunlight available to keep the batteries full during prolonged periods of inclement weather. The generator should be sized to meet site load requirements and also have spare power to charge the batteries.
Important specifications for Sungrow Hybrid inverters acting in off grid:
For more installation tips about Sungrow Hybrid inverters you can also explore the Sungrow Knowledge Base.
Battery Stack Configuration
Sungrow batteries are stackable in 3.2kWh modules, and can be installed in stacks of minimum 3 units to achieve 9.6kWh storage, or a maximum of 6 units to achieve 19.2kWh of storage per stack. Battery stacks can be installed in parallel using the Sungrow battery combiner box where higher storage capacity is required, up to 4 stacks in parallel (76.8kWh max storage per site)
These impressive power output and battery storage specifications from the Sungrow hybrid inverter range will allow for simple and powerful solutions for sites where it is impossible, impractical or expensive to have grid supply.
Official distributor of Sungrow in Australia & New Zealand
For assistance in designing and supplying an off-grid Sungrow solution, feel free to contact our dedicated team. We have Sungrow in-house specialist and our team’s technical knowledge across Sungrow brand and product range, ensures you can navigate any technical issues or support questions.