Solar panels generate electricity only during daylight hours, yet most Australian households use two-thirds of their 16kWh daily electricity after dark. This raises an important question: how do solar batteries work during non-generating hours?
A solar battery system provides a practical answer to this energy puzzle. Your solar panels often produce more electricity than needed during peak hours. The excess energy, instead of flowing back to the grid, gets stored in your solar battery for later use. You can power your home with clean energy even when sunshine isn’t available. The popularity of these systems continues to grow. Victoria alone has seen more than 18,000 solar battery installations since August 2018. This piece will explain the workings of solar panel battery storage, its advantages, and ways to get the most value from your renewable energy investment.
What is a solar battery and how does it work?
A solar battery stores extra electricity that your solar panels generate. You can use this stored power instead of sending it back to the grid. This comes in handy during evenings or cloudy days when you just need more power.
How solar batteries store energy
Solar batteries store energy as direct current (DC) electricity. Lithium-ion batteries are the most common choice for home systems – the same technology that powers electric vehicles and smartphones. These batteries use a chemical reaction to turn extra electricity into charged particles called ions.
LFP (lithium iron phosphate) batteries are becoming more popular because they’re safer. The storage process in these batteries happens as lithium ions move between cathodes and anodes. The energy stays in this chemical state until you use it. On top of that, lithium-ion batteries can use about 90% of their total capacity. This means a 10kWh battery gives you roughly 9kWh of usable power.
When and how stored energy is used
The battery power kicks in automatically whenever you just need more electricity than your solar panels produce. This usually happens during peak evening hours after sunset or on days without much sun.
Smart systems can manage power based on electricity prices. If you have a time-of-use tariff, the software works with weather forecasts to fill your battery before expensive peak evening rates. Some batteries can even charge from the grid at cheaper night rates to help you save more money.
What happens when the battery runs out
Your home switches to grid power automatically once your battery runs empty. The switch happens naturally without any power interruption. But standard solar battery systems will shut down along with the grid during a blackout unless they’re specifically built withbackup features.
You can get backup-enabled systems that disconnect from the grid and power essential circuits in your house. The backup time depends on your battery size and which appliances you run.
How solar panels and batteries work together
Solar panels with battery storage use complex energy conversion processes that power your home. You can get the most value from your solar battery system by understanding how these components work together.
Energy flow from panels to inverter to battery
Solar panels capture sunlight and transform it into direct current (DC) electricity through the photovoltaic effect. Your home appliances use this electricity first, and any extra energy goes to your battery storage system for future use. Inverters control this whole process and decide where your electricity should flow.
The system works simply during daylight hours. Your solar cells collect the sun’s energy as DC electricity. An inverter changes this current to alternating current (AC) that your house can use right away. Any excess power travels to the battery inverter for storage.
AC vs DC: The role of inverters
Solar battery systems face a basic challenge. Solar panels create DC electricity and batteries store DC electricity, but household appliances need AC electricity. So inverters act as the vital bridge between these components.
Your system’s inverters handle several key tasks:
- Converting DC from panels to AC for home use
- Converting AC back to DC for battery storage
- Converting stored DC energy back to AC when needed
What is a hybrid inverter?
A hybrid inverter combines a solar and battery inverter’s functions into one unit. These all-in-one devices manage power flow between your solar panels, battery, and home, unlike traditional inverters.
Hybrid inverters excel at efficiency. They let DC power from solar panels charge batteries directly without multiple conversions, which reduces energy loss. These systems also switch smoothly between power sources during outages.
Hybrid inverters often provide the most economical solution for new solar installations with batteries. They prove especially useful in areas with grid capacity limits since they count as a single inverter connection instead of separate solar and battery inverters.
Benefits of using a solar battery system
Solar battery systems offer advantages way beyond their technical functionality. Homeowners who want to justify the upfront costs should understand these benefits.
Lower electricity bills
A battery addition to your solar setup leads to big savings through increased self-consumption. Households using both solar panels and batteries pay about 40% less on electricity bills compared to those using grid power alone. Some homeowners save between 50-80% on their energy bills, based on their usage patterns and system size.
These savings happen because:
- You use more of your own solar-generated electricity instead of selling it back to the grid at low rates
- You avoid buying expensive electricity during peak evening hours
- You can charge batteries during off-peak times if you’re on a time-of-use tariff
Blackout protection and backup power
Continuous power supply during grid outages is a key benefit that homeowners value. Most new solar batteries provide blackout protection through a process called ‘islanding’, which safely disconnects your system from the grid.
You can choose between two backup options:
- Whole-of-home backup: Powers your entire house but uses up battery power quickly
- Essential load backup: Powers critical circuits like lighting and refrigeration, making the battery last longer during outages
Environmental impact and carbon reduction
Solar batteries boost your contribution to environmental protection. You directly reduce your carbon footprint by maximising solar energy use. Without a battery, excess daytime energy goes to the grid while you still depend on fossil fuel-generated electricity at night.
Carbon reduction happens through:
- Reduced dependence on coal and gas-powered electricity, especially during peak demand
- Better efficiency through local energy consumption, which cuts transmission losses
- Support for Australia’s renewable energy targets
Real-life example
Australian households with solar battery systems see remarkable benefits. Many families find their annual energy costs drop dramatically after installing combined systems – sometimes reaching almost zero. These homeowners gain more energy independence even on cloudy days and reduce their carbon footprints.
Smart features and advanced use cases
Modern solar battery systems pack intelligent features that do more than simple energy storage. These advanced capabilities help homeowners get the most value from their investment.
Charging from the grid during off-peak hours
AC-coupled battery systems can charge from thegrid at times when electricity prices are lowest. Homeowners with Time-of-Use tariffs can fill their batteries with cheap off-peak power and use it during expensive peak periods. This feature depends on specific functionality and compatible inverters. Tesla, BYD, and Enphase are among the major battery brands that support this capability.
Using weather forecasts to optimise charging
Smart battery management systems use AI to predict next-day solar production based on weather forecasts. Your system can make smart decisions automatically with this intelligence. The system can charge your battery from morning sunshine or cheap overnight grid electricity if it predicts cloudy weather. The TESVOLT Energy Manager shows how this works by learning your energy consumption patterns and adapting charging strategies.
Virtual Power Plants and community energy sharing
A Virtual Power Plant (VPP) links multiple home batteries into a coordinated network. Your battery becomes part of a larger system that responds to grid demands when you join a VPP. Members receive financial benefits like higher feed-in tariffs, upfront discounts, or regular payments. Many participants earn AUD 1.53 per kWh during VPP events. Smart homeowners find these arrangements increasingly attractive.
Ready to take control of your energy future?
Solar batteries are no longer a luxury – they are the key to true energy independence and massive savings. At RAD NRG, we help Australian homeowners slash their power bills by up to 80% and keep the lights on when the grid goes down.
Don’t let your extra solar energy go to waste. Click here to get your free, no-obligation quote from RAD NRG today and start powering your home on your own terms.
