Single MPPT and dual MPPT are two different types of maximum power point tracking (MPPT) systems used in photovoltaic (PV) systems. The main difference between the two is the number of MPPT channels they have.
A single MPPT system has one MPPT channel, which means it can only track the maximum power point of one PV array. This type of system is typically used in smaller PV systems where only one PV array is present.
On the other hand, a dual MPPT system has two MPPT channels, which means it can track the maximum power point of two PV arrays. This type of system is typically used in larger PV systems where two or more PV arrays are present. The dual MPPT system allows for the ability to track the maximum power point of each PV array separately, which results in better overall energy production.
The main advantage of a dual MPPT system is its ability to optimise the energy production of multiple PV arrays. For example, if one PV array is partially shaded and the other is in full sunlight, the dual MPPT system will be able to track the maximum power point of each PV array separately and ensure that the PV system is producing the maximum amount of energy possible. This is not possible with a single MPPT system, as it can only track the maximum power point of one PV array.
Another advantage of a dual MPPT system is its ability to handle PV arrays with different voltage and current characteristics. For example, if one PV array has a higher voltage and lower current, and the other PV array has a lower voltage and higher current, a dual MPPT system will be able to track the maximum power point of each PV array separately and ensure that the PV system is producing the maximum amount of energy possible.
However, dual MPPT system is more complex than single MPPT system and also it is relatively more expensive. It also takes up more space and requires more wiring.
Conclusion
In conclusion, the main difference between single MPPT and dual MPPT is the number of MPPT channels they have. A single MPPT system has one MPPT channel, which is typically used in smaller PV systems, while a dual MPPT system has two MPPT channels and is typically used in larger PV systems to optimise energy production and handle PV arrays with different voltage and current characteristics. Dual MPPT systems are more complex and expensive than single MPPT systems, but they offer more flexibility and better overall energy production.