How to connect solar panels in Series vs. Parallel

Posted by Waaree Energies on 7th Jul 2022

How to connect solar panels in Series vs. Parallel

 solar panels in Series vs. Parallel


A s a homeowner learning about solar energy alternatives for the first time, it's easy to become perplexed by all the technical terms you'll encounter. You may have heard about the various types of solar panel wiring. It has an impact on your system's overall performance as well as the inverter you'll be able to use. You want your panels to be wired so that they provide you with the most savings and a higher return on investment.

What does "wiring solar panels in series" imply?

Like batteries, solar panels consist of two terminals: positive and negative. A series connection is created when the positive terminal of one panel is connected to the negative terminal of the other panel. A PV source circuit is created when two or more solar panels are connected.

When solar panels are connected in series, their voltages get added up, but their amperage remains the same. When panels are connected in a series of wiring, the array's voltage rises. This is significant because the inverter in a solar power system must operate at a specific voltage to function properly. As a result, you connect your solar panels in line to meet your inverter's working voltage window requirements.

What does it mean to connect solar panels with parallel wiring?

When solar panels are connected in a parallel manner, the positive terminals of a single panel are connected to the positive terminals of another panel, and the negative terminals of both panels are connected, respectively.

Positive wires are joined with the positive connector in a combiner box, whereas negative wires are joined to a negative connector. A PV output circuit is formed when many panels are connected in parallel.

What Is The Advantage of Solar Panels Being Installed In Parallel?

The amperage increases when solar panels are generally wired parallelly while the voltage remains constant. If you wired the same panels in parallel, the system's voltage would stay at 40 volts, but the amperage would rise to 10 amps.

Parallel wiring permits additional solar panels that produce solar energy without exceeding your inverter's working voltage capacity. Inverters are mainly limited by amperage, which you can overcome by connecting your solar panels in a parallel network.

Difference Between Solar Panels Connected In Series And Solar Panels Connected In Parallel

connecting solar panel


A charge controller is a key component when it comes to solar panel wiring. Charge controllers with Maximum Power Point Tracking (MPPT) are used to connect solar panels in a series, whilst charge controllers with Pulse Width Modulation (PWM) connect solar panels in parallel.

Solar panels work in the same way as circuits wired in series. The entire circuit fails if one of the panels in a series has an issue with its connection. Meanwhile, a single faulty panel or a loose wire in a parallel circuit will not affect the output of the other solar panels.

When Utilising A String Inverter, How To Wire The Solar Panels?

String inverters require a rated voltage window from the solar panels to operate. It also includes a rated current requirement for the inverter to work effectively. Maximum power point trackers (MMPT) are built into string inverters, allowing them to adjust current and voltage to create the most amount of power feasible.

The open-circuit voltage of most crystalline solar panels is roughly 40 volts. The operational voltage window for most string inverters is between 300 and 500 volts. This means that you might have between 8 and 12 panels in a sequence when creating a system.

Anything more than that would surpass the inverter's maximum voltage capability.

The problem is that most solar panel systems have more than 12 panels. So, to increase the number of panels in the system, you might wire another set of panels in parallel. This allows you to have the proper number of panels to suit your home's energy needs while staying within your inverter's limitations.

Is It Good To Wire In A Series Or Parallel Manner?

In theory, parallel wiring is a preferable solution for many electrical applications since it allows the panels to operate continuously even if one of them fails. However, it isn't always the ideal option for every application. You may need to meet specific voltage requirements for your inverter to work.

A key balance of voltage and amperage must be established for your solar array to work at its best. As a result, your solar array will most likely be designed with a combination of series and parallel connections.

Can You Expand Your Solar Panel System?

Going with a full installation from the outset is always the best option when installing a residential solar system. A solar calculator may help you figure out how much your solar system will cost and how much power you'll require to figure out how many panels you'll need.

If your budget is restricted, or you misjudged your future power needs while installing your PV panels, you may want to explore adding extra panels to your current system.

If you plan to expand your solar PV system in the future, be sure your system is designed with that in mind. You should have a larger inverter to accommodate more panels in the future.

How Are Solar Panels Wired When Microinverters Or Optimisers Are Used?

The use of micro inverters or optimisers in your solar system design can help you circumvent the string inverter size constraints. Your system can be enlarged one panel at a time by connecting each panel to its microinverter.

This can be done with existing string inverters that have reached their maximum capacity, as long as the additional panels are connected to the string inverter's AC side.

What Is The Best Way To Connect Solar Panels To The Grid?

Another factor to consider when deciding between series and parallel wiring is the number of wires utilised to connect the solar system to the grid. A single wire will be used to link a series of connected circuits. On the other hand, a parallel wired system will have many cables connecting it to the grid.

Why Not Have Both Series And Parallel?

The most important thing to understand is that wiring in series raises voltage while paralleling raises amperage. When constructing your system, both voltage and amperage must be considered, especially when looking for the ideal inverter for your needs.

solar installation expert will almost always build a system that includes both series and parallel connections. This allows the system to run at a higher voltage and amperage without overheating the inverter, allowing your solar panels to perform optimally.

To get more clarity about solar connections and their benefits and to get the most efficient product for yourself, visit us at Waaree. We provide the best customer experience with top solar products and services at the most affordable prices in the market.