If you’re planning to upgrade your solar system, you may be wondering whether you should add more solar panels or install a solar battery.
There isn’t one answer that suits every Perth household. The right option depends on your current solar system, electricity consumption, roof space, when you use electricity and your future energy needs.
For homeowners comparing solar battery vs bigger solar system Perth, the key question is simple:
Do you need to generate more electricity, store the electricity you already generate, or do both?
A larger solar system increases daytime generation, while a battery stores suitable excess energy for later use. Understanding the difference can help you invest in an upgrade that matches your home’s actual requirements.
A bigger solar system gives your home greater solar generation capacity during daylight hours.
A solar battery stores excess electricity generated by your solar panels so it can potentially be used later, such as in the evening when solar production falls.
In simple terms:
More solar panels = more electricity generation
Solar battery = more energy storage
Neither option is automatically better. Your household’s electricity usage determines which solution is likely to be more suitable.
Factor | Bigger Solar System | Solar Battery |
Main purpose | Generate more electricity | Store excess electricity |
Best suited to | Higher daytime energy use | Higher evening/night use |
Stores excess solar | No | Yes |
Provides energy after sunset | No | Yes, while stored energy remains |
Requires additional roof space | Usually | No additional panel space |
Useful for EV charging | Excellent for daytime charging | Can support later charging, depending on system |
Blackout backup | Not automatically | Possible with suitable backup equipment |
Can work with existing solar | Often, subject to design | Often, subject to compatibility |
Main consideration | Generation requirements | Storage and consumption |
This is why the solar battery vs bigger solar system Perth decision should be based on your energy profile rather than simply choosing the larger system.
Adding more solar panels can make sense when your existing system doesn’t generate enough electricity to meet your household’s daytime requirements.
A larger solar system may be worth considering if you:
For example, if your Perth home regularly uses electricity for air conditioning, pool equipment or EV charging while the sun is shining, additional solar generation could help supply some of that demand.
A solar system upgrade Perth homeowners are considering should take into account roof orientation, panel capacity, inverter capacity, existing electrical infrastructure and future energy requirements.
A battery may be more useful when your existing solar system already produces surplus electricity during the day, but your household uses more electricity after sunset.
This can happen when:
A solar battery Perth installation can store suitable surplus solar energy and make it available for household use later.
However, battery capacity should be selected according to your actual energy consumption. A larger battery isn’t necessarily a better investment if your home doesn’t regularly have enough surplus solar to charge it.
Start by looking at your electricity bills and solar monitoring data.
If your solar system regularly produces less electricity than your home consumes during the day, additional solar generation may be worth investigating.
If your system produces substantial surplus electricity but you purchase significant electricity after sunset, battery storage may be more relevant.
For some homes, the best solution may eventually be a combination of additional solar and battery storage.
The objective is to match the system to how your household actually generates and consumes energy.
If you already have rooftop solar, you may not need to replace the entire system.
Depending on the existing installation, an electrician may assess options such as:
Your solar inverter, switchboard, electrical protection, panel configuration and available capacity should be checked before an upgrade is recommended.
This is particularly important with older solar installations, where newer equipment may have compatibility or capacity considerations.
Whether a battery is worthwhile depends on your home’s energy profile.
Before investing, consider:
A battery can be particularly relevant when your home produces surplus solar during the day but has significant electricity demand after sunset.
For another household, expanding the solar system may be the more appropriate first step.
A professional assessment can help determine whether your property would benefit more from additional solar, battery storage or both.
Willex Electrical is a Perth-based electrical contractor holding WA Electrical Contractor Licence EC14820, with more than 25 years of electrical experience across the UK, New Zealand and Australia.
Willex provides residential and commercial electrical services including:
The team has experience with battery technologies including Sigenergy, Sungrow, GoodWe, iStore and Fox ESS.
This broader electrical experience allows Willex to consider your solar system, switchboard and future electrical requirements together rather than recommending equipment based purely on size.
The answer to solar battery vs bigger solar system Perth depends on how your home generates and uses electricity.
More solar may be better if: your current system doesn’t generate enough daytime electricity and you have suitable roof space.
A battery may be better if: your existing solar system produces surplus energy during the day and your household uses substantial electricity later.
Both may be suitable if: your household has high overall energy consumption and you want to increase generation while storing excess energy for later use.
Before investing, review your electricity consumption and existing solar performance and have your electrical system professionally assessed.
It depends on your electricity usage. Additional panels can be beneficial when daytime energy demand is high or your existing system is too small. A battery can be more useful when surplus solar is available during the day and electricity consumption is higher in the evening.
It can make sense if you have sufficient daytime energy consumption and can charge your EV while solar generation is available. If you mainly charge at night, battery storage may also be worth considering.
In many cases, yes. Your existing solar inverter, panels, switchboard, electrical protection and proposed battery system should be assessed for compatibility before installation.
