Series-Parallel Combination Wiring Diagram
What is Series-Parallel Wiring?
A series-parallel configuration combines both series and parallel connections to achieve the desired voltage and current. Panels are first connected in series strings, then these strings are connected in parallel. This allows you to customize your system for specific voltage and current requirements.
Key Formula
Total Voltage = Panel Voltage × Panels in Series
Total Current = Panel Current × Parallel Strings
Total Power = Panel Wattage × Total Panels
Series-Parallel Configuration Calculator
System Results
Series-Parallel Wiring Diagram
Visual Diagram
Series Strings
Parallel Strings
How to Wire Series-Parallel
Plan Your Configuration
Determine the voltage and current you need for your charge controller.
- Check controller max voltage
- Check controller max current
- Calculate panels needed
Create Series Strings
Wire panels in series to achieve your target voltage.
- Connect positive to negative within each string
- Each string will have voltage = panels × panel voltage
- Current stays same as panel current
Connect Strings in Parallel
Connect the series strings in parallel to achieve your target current.
- Connect all string positives to positive bus bar
- Connect all string negatives to negative bus bar
- Total current = string current × number of strings
Verify Voltage
Measure the output voltage with a multimeter.
- Check voltage matches expectations
- Ensure voltage doesnt exceed controller limit
- Verify all connections are secure
Connect to Controller
Connect the output to your charge controller.
- Connect positive to PV+
- Connect negative to PV-
- Monitor system to ensure proper operation
Common Configuration Examples
2S2P (4 Panels)
3S2P (6 Panels)
4S2P (8 Panels)
Pros and Cons of Series-Parallel
Advantages
- Customizable voltage and current
- Best flexibility for system design
- Good balance of voltage and current
- Reduces wire size requirements
- Works with MPPT controllers
- Can handle large solar arrays
- Partial shading affects only one string
Disadvantages
- More complex wiring
- More connections = more failure points
- Requires careful planning
- Need to match panel specifications
- More expensive connectors needed
- Harder to troubleshoot issues
- Requires fuse on each string
When to Use Series-Parallel Wiring
Ideal Scenarios:
- You have more than 4 panels
- You need to match specific charge controller specs
- You have a mix of panel orientations
- You want to balance efficiency and simplicity
- You have a 24V or 48V system with 6+ panels
- You want to expand your system incrementally
⚠️ Safety Warning
- Always add fuses/breakers on each series string
- Never exceed charge controller voltage rating
- Use appropriate wire gauge for total current
- Check all connections with multimeter before energizing
- Consider professional installation for complex systems
Related Wiring Diagrams
Need Help Choosing Your Configuration?
Use our calculators to determine the best configuration for your system.