How to Connect Battery to Solar Inverter

How to Connect a Battery to a Solar Inverter: Clear Instructions and Quality Support

Solar power doesn’t have to stop when the sun goes down. By pairing a battery with a solar inverter, every ray of sunshine can be captured and turned into reliable energy around the clock. 

For Aussie households, it means cutting back on rising power bills and keeping the lights on during blackouts. For installers, it’s about delivering smarter, future-ready systems your clients will thank you for.

This guide will walk you through how to connect a battery to a solar inverter, safely and step by step. Along the way, we’ll cover key safety checks and share tips that make the process smoother. Whether you’re upgrading your home or working on a client project, you’ll find the clear, practical advice you need.

What Is a Solar Battery and Inverter?

A solar battery stores the extra electricity solar panels produce during the day. Instead of sending the excess back to the grid, it can be used later when the sun isn’t shining. 

A solar inverter converts the direct current (DC) electricity generated by solar panels into alternating current (AC), which is the type of power used in homes and businesses.

When paired together, the inverter manages both the flow of solar energy into the battery and the release of stored energy when needed.

Why Connect a Battery to Your Solar Inverter?

• Backup Power: Stored energy provides security during blackouts, keeping essential appliances running.
• Optimising Energy Use: Extra solar power can be used in the evening and overnight instead of being sent back to the grid.
• Reduced Grid Reliance: Drawing less electricity from the grid means greater independence and stability.
• Energy Savings: Using stored solar instead of buying electricity from the grid helps lower power bills.
• Sustainability: Making full use of renewable solar energy reduces carbon emissions and supports a cleaner future.

iStore’s Solar Batteries and Inverters

At iStore, we offer solar batteries and solar inverters tailored to homes and businesses of different sizes and energy requirements.

Our batteries are made from lithium iron phosphate (LiFePO₄), one of the safest battery materials on the market.

They’re modular in design for flexibility and growth. You can connect up to six modules, scaling storage capacity from 5 kWh to 30 kWh. With this system, a home or business can start small and expand as its energy needs increase.

To complement our batteries, we offer a wide range of hybrid inverters suited to both residential and commercial applications:

• 5kW/6kW Single-Phase Hybrid Inverter: Ideal for standard home installations.
• 10kW Single-Phase Hybrid Inverter: Provides extra capacity for larger households.
• 10kW/15kW/25kW 3-Phase Hybrid Inverter: A strong option for businesses or properties with higher energy demands.
• 5000/6000 3-Phase Hybrid Inverter: Reliable performance for mid-sized commercial systems.
• 29900/40000 3-Phase Inverter: Heavy-duty solutions for large-scale commercial applications.
  

iStore solar batteries and inverters are built to work seamlessly together. The inverters manage both the charging of the batteries and the flow of stored energy back into the property when needed. This integration creates a smooth, efficient system that maximises solar usage, reduces grid dependence, and provides reliable backup power.

Factors to Consider Before Connecting a Battery to a Solar Inverter

Compatibility

Not all batteries and inverters work together, so compatibility is the first thing to check. The inverter must support the battery type for safe charging, efficient performance, and a longer system lifespan.

Using a hybrid inverter makes this process much simpler. Hybrid inverters are designed with built-in battery compatibility, so they can manage both solar panel input and battery storage without the need for extra components. This makes installation easier for professionals and gives households a system that’s ready for storage from day one.

Battery Size and Capacity

You must match storage capacity with your actual energy needs. A system that’s too small may run out of stored power quickly, while one that’s too large could mean paying for storage that rarely gets used.

• Smaller Households (1–3 people): 5–10 kWh batteries can cover evening use after the sun goes down.
• Larger Households (4+ people): 10–15 kWh batteries can comfortably power appliances and devices into the night.
• Businesses or Commercial Properties: Depending on operating hours and equipment, larger systems of 20 kWh and above can typically handle higher demand and provide reliable backup power.
  

It’s helpful to look at past electricity bills or monitor daily energy usage to find the most cost-effective battery size. Modular battery systems, like iStore’s, also allow for easy expansion if energy demand grows over time.

Safety Precautions

Safety should always come first when connecting a solar battery to an inverter. 

Proper wiring and voltage matching are critical for the system to run smoothly and to prevent damage to equipment. Incorrect connections can lead to overheating, short circuits, or reduced system performance.

Does a Solar Battery Have To Be Professionally Installed?

In Australia, a solar battery must be professionally installed by a licensed electrician who is accredited for battery storage systems.

Here’s why:

• High Voltage Risks: Solar batteries store and discharge large amounts of energy. Incorrect installation can cause electric shock, fire, or system failure.
• Warranty Protection: Most manufacturers, including iStore, require professional installation to keep warranties valid.
• Regulatory Compliance: Australian standards (such as AS/NZS 5139 for battery storage) set strict rules on how and where batteries can be installed. Accredited installers know these requirements and ensure the system is compliant.
• Insurance Coverage: Many home and contents insurers will not cover damage or loss caused by a battery system that was not professionally installed. 

Step-by-Step Guide: How to Connect a Battery to a Solar Inverter

If you are a licensed electrician and accredited solar battery installer, here are the general steps to follow to connect a battery to a solar inverter.

1. Gather necessary tools and equipment. Have the required cables, connectors, safety gear, and the manufacturer’s installation manual ready before starting.
2. Switch off all power sources. Shut down the solar system and isolate the inverter by switching off its AC isolator (disconnecting it from the switchboard) and DC isolator (disconnecting it from the solar panels). Doing this stops electricity from flowing into or out of the inverter during battery installation, preventing electrical hazards.
3. Check compatibility. Confirm that the inverter supports the battery type and capacity. Hybrid inverters usually make this step easier with built-in battery compatibility.
4. Position the battery. Place the battery in a well-ventilated, dry location away from direct sunlight and extreme temperatures.
5. Connect wiring. Use the manufacturer’s instructions to connect the battery cables to the inverter terminals. Pay close attention to polarity, connecting positive (+) and negative (–) cables to the correct terminals, and confirm that all wiring matches the required voltage.
6. Secure connections. Tighten terminals and check that all cables are properly insulated and fixed in place to prevent movement or wear.
7. Configure the system. Power up the inverter, activate the battery system, and configure settings through the inverter’s monitoring platform or control panel.
8. Test the system. Run performance checks to confirm that the battery charges and discharges correctly, and that energy flows seamlessly between the panels, inverter, battery, and household or business supply.

Tips for Safe and Effective Installation

• Review Manufacturer Instructions: Always follow the battery and inverter manuals for correct wiring, communication settings, and configuration.
• Confirm Compatibility: Check that the battery chemistry (e.g., lithium-ion), capacity, and voltage are supported by the inverter.
• Install Protective Devices: Fit isolators, circuit breakers, and fuses rated for the system to safeguard against overloads and faults.
• Use the Right Cable Size: Select cables suitable for the current, voltage, and installation distance to minimise voltage drop and overheating.
• Maintain Correct Polarity: Double-check positive (+) and negative (–) connections before powering on.
• Choose Safe Placement: Position the battery in a cool, dry, and ventilated space, away from direct sunlight, moisture, and flammable materials.
• Follow Australian Standards: Install according to AS/NZS 5139 for battery storage systems and other relevant electrical codes, checking placement requirements, clearances, and fire safety measures.
• Test and Commission Properly: Verify charging and discharging functions, set up monitoring software, and confirm the system operates as intended before handover.

Working with Clean Energy Council–accredited installers brings these safety measures together for a safe, compliant installation. Certified professionals understand how to apply AS/NZS 5139 and other electrical standards, reducing risks and giving households and businesses confidence that their investment meets Australian safety and quality benchmarks.

For iStore systems, this expertise means modular batteries and hybrid inverters integrate seamlessly, warranties remain valid, and the system delivers the performance and longevity it’s designed for. 

Common Challenges and Troubleshooting Tips

• Voltage Mismatch: If the battery voltage does not match the inverter’s requirements, the system may not start or could become damaged. Always check specifications before installation.
• Connection Errors: Loose or incorrect wiring, including reversed polarity, can stop the system from operating. Double-check all terminals and cable connections.
• Battery Not Charging: This may be caused by incorrect settings in the inverter, faulty wiring, or insufficient solar input. Reviewing inverter configurations and inspecting cables usually resolves the issue.
• Communication Faults: Some systems require data cables between the battery and inverter. Incorrect or missing connections can prevent the system from reporting or functioning properly.
• Environmental Factors: Extreme heat, poor ventilation, or moisture around the battery can lead to reduced performance or shutdowns. Correct placement helps avoid these issues.

Preventive Tips

1. Regularly monitor system performance through the inverter’s app or display.
2. Keep firmware and software updated for compatibility and efficiency.
3. Inspect wiring and isolators during scheduled maintenance.
4. Keep the battery space cool, dry, and well-ventilated to protect performance.

For any issues that can’t be resolved through basic checks, iStore’s support team is available to provide expert troubleshooting and product assistance.

FAQs

How To Connect a Solar Panel Inverter and Battery

To connect a solar panel inverter and battery, a licensed electrician and accredited solar battery installer will

1. Turn off all power sources and isolate the inverter using AC and DC isolators.
2. Check that the inverter and battery are compatible.
3. Position the battery in a safe, ventilated location.
4. Connect the battery cables to the inverter, matching positive (+) and negative (–) terminals.
5. Secure all wiring with the correct cable size and protective devices.
6. Switch the system back on, configure settings, and run performance tests.

Can I Connect Any Battery to a Solar Inverter?

A solar inverter only works with specific battery types, voltages, and capacities. The battery and inverter must be compatible, which is why hybrid inverters and professionally matched systems are recommended.

Do I Need a Hybrid Inverter To Connect a Battery?

A hybrid inverter is the easiest way to connect a battery because it has built-in battery compatibility. With a standard solar inverter, an additional battery inverter or charger is required.

What Type of Battery Is Best for Solar Inverters?

Lithium-ion batteries are the most common and efficient choice for solar inverters. They offer longer lifespans, faster charging, and higher usable capacity compared to lead-acid batteries.

Is It Safe To Install a Solar Battery Myself?

Solar batteries must be installed by a licensed installer in line with Australian standards. DIY installation can create serious safety risks and may void warranties and property insurance.

Is a 10 kW Battery Enough To Run a House?

A 10 kWh battery is often enough to cover evening and overnight use for an average household, but the exact size needed depends on energy consumption, appliances, and lifestyle.

Simplify Your Solar System with iStore’s Battery and Inverter Solutions

Pairing a solar battery with an inverter unlocks the full potential of solar power. It means making better use of the energy collected during the day, cutting down on power bills, and having backup power ready when the grid goes out. 

iStore makes this dynamic duo simple with high-quality solar batteries and hybrid inverters that are designed to work together perfectly. They’re built to scale with changing needs, whether it’s for a growing family home or a busy business. 

Browse our solar battery and solar inverter ranges today. For expert advice and a quote, get in touch by calling 1300 515 640 or filling out this online form.

If you need help figuring out how to connect a battery to a solar inverter, we can also organise professional installation for you.

Connecting a battery to a solar inverter has never been easier, thanks to iStore!