Parallel connection is a method used to connect solar panels or other photovoltaic modules to increase the total current of the system without changing the voltage. This configuration can be useful when the power demand requires a higher current, but the system voltage must be maintained at a specific level.
How does parallel connection work?
- The positive terminals of the solar panels are connected to each other, and similarly, their negative terminals are also connected.
- As a result, the system current (measured in amperes) increases, while the voltage (measured in volts) remains at the nominal voltage level of the individual solar panels.
Example of parallel connection
Suppose there are two solar panels, each with:
- Voltage (V): 24 V
- Current (A): 5 A
If we connect them in parallel:
- System voltage (V): 24 V
- System current (A): 5 A + 5 A = 10 A
This allows the system to deliver higher power while the voltage remains unchanged.
Advantages
Flexibility in meeting energy demand: Allows you to achieve a higher current without increasing the voltage, which must remain at a specific level for certain inverters or devices.
Modular expandability: New solar panels can be easily added to the system if current generation needs to be increased.
Voltage stability: The system voltage remains at the nominal level of the individual modules.
Disadvantages
Losses due to higher current: Higher current can cause greater wire resistance losses, so appropriately sized cables must be used.
Effect of individual modules on performance: If a module is shaded or faulty, it can reduce the overall system efficiency, unless bypass diodes are used.
More complex wiring: More cables are required for parallel connection, which can increase installation costs.
Application
Parallel connection can be particularly useful in situations where:
- The inverter input voltage is limited.
- The goal of the installation is for the solar panels to operate at a lower voltage level but higher current.
- System expandability is needed in the future.
Parallel connection can be an effective solution, but proper system design and optimization of wiring are crucial to minimize losses and maximize performance.