What components make up a quality solar PV system?

Across Australia installing a solar system has become increasingly more accessible, affordable and therefore more common in recent years. In fact, if you were to drive around your surrounding streets and suburbs, you should be able to spot at least some, if not many solar panels on the roofs you come across.

While many people might understand the concept that solar panels use sunlight to create energy that appliances can use to run, thus reducing electricity bills, they aren’t aware how a solar panel system works. To be able to comprehend this you must first know the process of a solar panel system and the components used… yes there’s more than just the solar panels.

How a solar PV system works

solar pv system diagram

A solar system’s functional purpose is to convert sunlight into electricity using solar panels and other various components.

Solar PV systems installed at a home will typically have solar panels mounted on the roof to receive maximum exposure to sunlight. The solar panels absorb the sun’s rays which they convert to Direct Current Energy. The Direct Current (DC) Energy is then converted into Alternating Current (AC) Energy once fed through the solar system’s inverter. Once converted to AC electricity a household will run off this instead of energy from the electricity grid or battery.

A house that has a grid connected solar system will pull from the electricity grid as a secondary source of electricity, if the solar system is not producing enough energy. A household that has an off-grid solar system will pull from a generator or battery as a second source of electricity.

Note: A grid connected system can also have a battery installed depending on what inverter the solar system has. 

Grid-connected solar systems with or without battery are the most commonly installed solar systems due to affordability and practicality, however there is the possibility to go completely off-grid with an off-grid solar system which you read about here.

Components of solar installation

Solar panels

When you have several solar panels as part of your solar system they are referred to as a Solar Array. As mentioned earlier the solar array’s job is to absorb energy from the sun and convert this energy (sunlight) into Direct Current electricity (DC electricity). This DC energy is then fed into the inverter. The larger the solar system and the more panels that make up your solar array, the greater the amount of energy the solar system can produce.

When deciding on solar panels you’ll have three different makes to choose from; Monocrystalline, Polycrystalline and Thin Film, however quality, efficiency and warranty is the most important criteria to research when selecting panels.

Solar inverter

Solar Power Inverter

The inverter is the brain of a solar system and has the role of converting DC energy that is received from the solar panels into AC electricity, which is fed through the switchboard for a household to run off this electricity.

There are different types of inverters available which can perform additional functionalities that a standard inverter does not. This can include feeding excess energy produce into battery storage (Hybrid Inverter) or optimising singular panels (Micro Inverter).

Inverters require more maintenance than solar panels do, due to them constantly running and converting energy, which can cause them to overheat if not properly maintained.

Switchboard

The switchboard’s purpose is to receive the AC electricity from the inverter and feed it into the household’s circuits and appliances.

Solar meter

Solar MeterA solar meter, also referred to as a smart meter measures the electricity flow that your home exports and imports to the grid.

If the solar system is not generating enough energy for a household to run, electricity is pulled from the electricity grid as a second source of energy.

In the instance you have excess energy, a grid connected solar system will send this energy to the electricity grid and the household will receive reimbursement in the form of a Feed-in Tariff on their electricity bill. 

If a solar system has battery storage this excess energy will be stored in the battery instead of being exported to the grid.

Solar panel mounting system

solar panels mounting system smauA mounting system, also referred to as a racking system is what physically fastens your solar panels to your existing roof. This is an integral component of a solar system and will ensure the solar array is securely affixed through rain, wind and hail. 

In some cases a solar provider may need to remove tiles on your roof to install the mounting system, however this is dependent on what roof style and make the household has.

Battery storage

Battery storage is an optional component for a solar system, however the uptake and installation of them is slowly becoming more common as the cost of batteries gradually decreases and the payback period becomes more practical to the average household.

solar battery storage

A solar system will charge a battery with the excess power the household has not used and store the power for use when the solar system is not generating enough or any energy.

Stored energy like this is typically used in the evenings or on overcast days when there is not enough sunlight reaching the solar panels.

Now you know all about the components that make up a quality solar system, why not find out the possible savings you could be making by installing solar!

 
Try our free solar calculator to find out the ideal solar system size for your needs, pricing and estimated savings! 

Solar Saving Calculator!

Download Your FREE Beginner’s Guide To Solar Power!

Beginners Guide to Solar Power

If you’re considering solar for your property or just looking to maximise the savings for your solar system, download a FREE copy of our "Beginner’s Guide To Solar Power".

Become an expert and better understand the ins and outs of solar power and solar PV systems for your property.

Includes detailed explanations and diagrams of the various types of solar systems and their parts, solar battery storage systems, Government incentives, expected ROI periods, finance, energy saving tips and more!

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Understanding Batteries

Off-Grid Systems

For some households a battery system can be of great benefit and minimise a home’s reliance on the grid. However, it’s important to understand for a battery to be useful your solar system needs to be generating excess energy for the battery to store, which you can then use at night or when the sun is not out.

When selecting a battery, you’ll want to invest in a system that is most suited to your home and can drive the best return on investment (ROI). Despite a larger upfront cost, a higher quality battery may significantly increase your ROI.

    Battery systems start from $6,000 and costs can vary greatly based on the following factors:

  1. Cycle Life-Time

    The number of times a battery can fully charge and discharge.

  2. Battery Power (kW)

    How fast it can be charged or discharged.

  3. Storage Capacity (kWh)

    The maximum amount of energy a battery system can store.

  4. Battery Management System (BMS)

    An electronic ‘smart’ system that gathers data and manages the battery ensuring it does not overload or operate outside of its safe functioning zone..

  5. Inverter

    Battery systems require their own inverter if your solar system does not have a hybrid inverter.

  6. 'All-In-One Unit’

    A system which includes the battery, BMS and an inverter all in one unit.

  7. Warranty

    Length of time or cycles the battery system is under guarantee.

  8. Blackout Protection/Backup

    It’s important to note this is not a common feature of a battery system and could cost thousands of dollars to include. Blackout protection not only requires additional components but also a specialised installation and rewiring. For grid-connected homes, the cost for blackout protection can outweigh the benefit.

Additionally, if your purpose for adding battery is to go Off-Grid and become completely independent from the grid you will need to ensure your solar system can generate enough energy to power your home and your battery system is large enough to store this energy. For homes in metro areas going Off-grid is not cost effective and is only recommended for those in remote areas with limited access to the grid. Off-grid solar systems with battery start at approximately $30,000.