What is the difference between a string and MPPT?

In this guide, we will cover What is the difference between string and MPPT?, How many strings per MPPT?, What is the function of MPPT?

What is the difference between string and MPPT?

The difference between string and MPPT (Maximum Power Point Tracking) concerns their roles in a solar energy system. A string refers to a series of solar panels connected in series to form a single electrical circuit. The string voltage is the sum of the voltages of the individual panels, while the current remains the same as that of a single panel. MPPT, on the other hand, is a technology used in inverters to optimize the power output of solar panels by adjusting the electrical operating point to the maximum power point of the grid, thus ensuring that the system generates the most electricity possible at from available sunlight.

The number of strings per MPPT varies depending on the design and capacity of the inverter. Typically, an inverter can manage multiple strings, with each MPPT managing a specific string or set of strings. The exact number depends on the inverter specifications and solar array configuration. In some systems, each MPPT can handle one or two strings, while others can handle more, depending on factors such as panel voltage, system design and inverter capacity.

How many strings per MPPT?

The function of MPPT (Maximum Power Point Tracking) is to continually adjust the electrical operating point of the solar panels to ensure that they are producing the maximum power possible. MPPT technology optimizes power output by varying electrical parameters to find and maintain the maximum power point, taking into account factors such as changes in sunlight, temperature and panel conditions. This ensures that the solar power system operates at maximum efficiency.

What is the function of MPPT?

In the context of solar energy systems, a “string” refers to a series of solar panels connected in sequence. When panels are wired in series to form a string, the total voltage of the string increases while the current remains the same as that of an individual panel. The string output is then fed into the inverter, which can use MPPT technology to optimize performance.

Photovoltaic modules of different wattages should not be used in the same MPPT as they may affect the overall system efficiency and performance. Panels with different power ratings have varying voltage and current characteristics, which can lead to mismatches and reduced efficiency when connected together. The MPPT algorithm is optimized for a specific voltage and current range, and mixing panels with different specifications may prevent the MPPT from operating efficiently, resulting in lower overall power output.

We hope this article about What is the difference between a string and MPPT? was easy to understand.