Solar Battery

Battery for Solar Energy Storage

We use the best and most efficient battery for solar energy storage for your residential and commercial needs. Our solar systems are installed with GCL System Integration’s lithium E-KwBe cell, a super slim and compact solution for your needs. The battery holds the equivalent storage of a Tesla Powerwall battery but is half the weight and size. Looking for a battery to store solar energy? Isolux Solar help you with the solar system battery planning, installation and maintenance.

LG Solar Battery

Compact Size & Easy Installation

The compact and lightweight nature of the RESU is world-class. It is designed to allow easy wall-mounted or floor-standing installation for both indoor and outdoor applications. The inverter connections have also been simplified, reducing installation time and costs.

Powerful Performance

The new RESU series features industry-leading continuous power (4.2kW for RESU6.5) and DC round-trip efficiency (95%). LG Chem’s L&S (Lamination & Stacking) technology provides durability ensuring 80% of capacity retention after 10 years.

Proven Safety

LG Batteries for Solar – LG Chem places the highest priority on safety and utilizes the same technology for its ESS products that has a proven safety record in its automotive battery. All products are fully certified in relevant global standards

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Sungrow Solar Battery

Sungrow Solar Battery

Innovative and Reliable

1. High reliability and safety with prismatic cells from Samsung
2. Cutting-edge bidirectional active cell balancing to prolong the battery lifetime effectively
3. Robust BMS provides multi-protection at both cell level and system level
4. Over 95% depth of discharge to maximise the usable capacity

Easy Installation

1. Suitable for both free-standing and wall-mountable installation
2. Simple setup for multiple batteries
3. One-click online firmware update

Intelligent Management

1. Remote monitoring of battery status with App and web portal
2. Smart hibernation technology to maintain a state of health

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Sonnen Solar Battery

Sonnen Battery

High-quality Components

The sonnenBatterie is a complete system – ready for connection. This means that inside of every sonnenBatterie you’ll find not only the extremely durable battery modules but also an inverter, an intelligent energy manager, measurement technology and the software to operate it all smoothly.

Create Your Own Energy Mix

The sonnenBatterie isn’t limited to storing energy generated by a PV system. A micro-cogeneration plant generates energy and heat. Just connect it to the sonnenBatterie to store its energy when the sun isn’t shining. Since you are generating heat too you’ll be even more independent.

Right Size Energy Storage

Every household has its own energy requirements. That’s why the sonnenBatterie was developed as a multi-stage storage system that can be adapted to most energy needs. With storage sizes ranging from 2kWh to 16kWh, the sonnenBatterie will power a detached house or a multi-family house.

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Alpha ESS Solar Battery


Alpha ESS was founded in 2012 to manufacture energy storage systems for residential and commercial solar systems. ESS stands for Energy Storage System. Alpha ESS is a Chinese company they have offices in Australia, United Kingdom, Italy and Germany. Alpha ESS build the SMILE series for the residential market and the STORION series for the commercial market with a capacity of up to 100kW.

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Senec Battery

Senec Battery

In 2009, Senec was founded in Germany with a primary focus on battery energy storage. Over the years, they have expanded their development efforts to encompass PV solar systems, wind power, and commercial systems.

A distinctive feature of a SENEC battery is its multi-award-winning technology, enabling the battery to undergo two cycles a day. Moreover, it is engineered to withstand 12,000 recharging cycles, which is twice the capacity of its leading competitors. This remarkable capability proves to be particularly advantageous during periods of high energy consumption, making it one of the top solar batteries available in Australia.

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Isolux is a reliable and trusted provider for all your solar battery needs in Australia. If you are looking out for the best and long-lasting solar system batteries, our experts are here to assist you.

What is a Solar Battery?

A solar battery is a battery that stores solar power (electricity) generated by the solar photovoltaic system for later use. This energy stored can be used to power homes and keep the appliances running in the event of power outages, blackouts, rainy days, etc. Solar energy storage batteries are a great investment for homes and commercial premises where grid electricity is unreliable. Solar system batteries are a key part of the solar systems. Choosing the right solar battery is equally important as selecting the perfect solar system.

Types of Solar Battery

1. Lithium-ion (Li-ion)

Lithium-ion (Li-Ion) batteries have grown in popularity among owners of solar energy systems in recent years. Lithium-ion batteries are the newest energy storage technology. As electric vehicle popularity grew, EV makers recognized lithium ion’s potential as a power storage option. They immediately rose to prominence as one of the most extensively used solar system batteries. Lithium-ion chemistry is classified into various categories. Lithium nickel-manganese-cobalt (NMC) is a typical kind used in household batteries. Lithium iron phosphate (LiFePO, or LFP) is another typical chemical.


  • Superior performance in cold temperatures
  • Deeper discharges per cycle
  • Superior quality
  • Perfect balance between price and performance
  • Lightweight and more efficient
  • Higher battery energy density
  • Longer life cycle of 10 years


  • Expensive than other solar system batteries
  • Risk of fire due to flammable liquid electrolyte

2. Lead-Acid

The most popular solar battery types is lead-acid solar batteries. They are made up of lead plates immersed in a mixture of sulfuric acid and water, commonly known as an electrolyte. These are the most common types of deep-cycle solar system batteries. This battery stores electrical energy through chemical reactions involving lead, water, and sulfuric acid.


  • Most cost-effective solar energy storage batteries available in the market
  • Reliable and relatively inexpensive
  • Easy to dispose and recycle


  • Careful and regular maintenance is required
  • Low depth of discharge
  • Shorter lifespan of 5 to 10 years
  • Sensitive to overcharging and high ambient temperatures
  • Poor weight-to-energy ratio
  • Not environment-friendly

3. Flow

It differs from other solar system batteries because it uses electrolytic fluids. Inside the battery, the electrolyte liquid circulates between two distinct compartments, or tanks. When charged, chemical reactions take place, allowing the energy to be stored and then released. These batteries are becoming increasingly popular. Among the most promising lithium-ion substitutes. These solar energy storage batteries are ideal for large-scale, off-grid systems.


  • 100% depth of discharge
  • Low maintenance
  • Long lifespan (30 years)
  • Work well at high ambient temperatures
  • Non-toxic and non-flammable


  • Highly expensive compared to other solar storage battery systems
  • Relatively low storage capacity
  • Low energy density
  • Low charge and discharge rates
  • Complex systems

Solar Battery Storage Cost Australia

The solar battery prices in Sydney, Australia, varied depending on various factors such as the size and type of the battery, brand, and retailer. However, the solar battery costs in Sydney could range from $5000 to $15000, including installation.

What is a Battery Cycle?

The number of cycles a battery can undergo a complete charge to a specific discharge level is referred to as its solar battery cycle. A battery cycle is the complete charge and discharge of a battery. Temporary charges and discharges do not constitute a whole battery cycle, even though they contribute to them. The total number of battery cycles can be used to calculate the battery’s warranty life. It is also critical to remember that you may receive more than one battery cycle each day.

Consider the following scenario:

The battery has completely discharged overnight. When the sun rises in the morning, the solar panel begins charging the battery.  The battery may be nearly fully charged by midday.

It becomes cloudy and starts raining. Solar power generation stops. The battery subsequently becomes the primary power source for the house and powers the appliances. The storm passes, the sun shines, and the battery recharges. It is evident that the battery can easily provide 1.5 cycles each day.

How Do Home Solar Batteries Work?

Step-by-step process for transforming sunlight into electricity and storing it in a battery for later use.

During the daytime:

  • Photovoltaic cells capture the sun’s energy and convert it to direct current electricity.
  • An inverter transforms direct current (DC) to alternating current (AC).
  • A switchboard distributes electricity to power electrical equipment when they are used.
  • Surplus solar energy is routed from the inverter to the battery inverter and stored in a battery.

During the night-time:

(Solar energy storage batteries store DC electricity.)

  • When triggered, the battery transfers electricity to the battery inverter.
  • The battery inverter transforms it from direct current to alternating current for usage in the house.
  • The switchboard is responsible for directing the stored energy to power the electrical appliances.
  • If the battery runs out of power, you must get electricity from the grid.

How Does Solar Charge the Battery?

The roof-mounted solar system charges the solar battery. When the sun shines, the solar panels generate free solar power. During the day, this powers the home. Any power not utilised in the house is sent back to the grid in a conventional solar panel system devoid of battery storage. The exported electricity produces a minor feed-in-tariff that is paid by utility provider

When you have battery storage, the extra solar electricity is used to charge the battery. This electricity is then discharged by the battery to power the house at night. This helps you save money on electricity by not depending on the grid electricity.

What is the Right Size Solar Battery System?

There are two major key parameters to consider while determining the appropriate size of solar battery.

To start, figure about the number of kilowatt hours (kWh) of power you consume at night and how much of it you want to be delivered by the battery.

Second, you must examine the size of the solar system that is necessary. The solar panel must be big enough to provide sufficient electricity for the residence throughout the day. It must also generate enough surplus electricity each day to replenish the battery.

To estimate the average daily kWh output of a solar system in Australia, use CEC norms and multiply the solar system size by 3.9.

Thus, a 5kW solar system will generate 5×3.9 = 19.5kWh of power each day on average. This indicates that a 5kW solar system may supply 15kWh of power for residential consumption.  This would leave an extra 4.5kWh per day to charge a solar battery storage system,

Isolux considers all of these factors when developing a solar battery power solution for you.

What Happens in a Blackout?

Having a battery may not necessarily safeguard you in the case of a blackout for most grid-connected equipment. Despite having solar panels providing power and a fully charged battery set and waiting, you still might lose all power to your residence.

This is due to what is known as ‘anti-islanding protection’ in grid-connected solar battery systems. During a power outage, the grid as well as the engineers working on the cables must be safeguarded from ‘islands’ of power generation (such as your solar panels) unexpectedly injecting power into the cables. The easiest option to offer anti-islanding protection for most solar PV systems is to completely shut down. As a result, when it detects a grid outage, the PV system shuts down, and you lose all household electricity.

During a blackout, more advanced inverters may offer anti-islanding protection while still keeping the solar panels and the batteries running so that the home has some electricity. However, this requires a huge investment because the technology is more expensive and you may need more solar and battery capacity than you think to power the house during a blackout.

Only vital home circuits, such as the refrigerator and lighting, should probably be allowed to run in those circumstances (this may need additional wiring work). A storage battery is likely to be depleted rapidly if it also needs to power other items that may use a lot of power.

Battery Specifications:

Here are the important technical specifications for a home (residential) battery that you must know before buying one.

1. Nominal Capacity

The total amount of energy that the battery can retain at one time, commonly expressed in kilowatt-hours (kWh). The nominal capacity of a battery is not necessarily the same as its usable capacity.

2. Usable Capacity

The amount of energy (kWh) that a battery can retain after depth of discharge.

3. Depth of Discharge (DoD)

The percentage of a battery’s capacity that may be drained on a regular basis without materially harming it or lowering its lifespan. Lithium batteries can often be discharged to 80% or 90% capacity, but lead batteries can only be discharged to 40% or 60% capacity. Flow batteries may be fully discharged.

4. Maximum Power

The maximum/peak amount of power that a battery can generate at a given time for a brief period of time (typically up to 30 seconds) (kW).

5. Continuous Power

The amount of power generated by the battery during regular, non-peak working conditions. This is the amount of power you can normally anticipate from the battery.

6. Roundtrip Storage Efficiency

The efficiency with which the battery is charged and discharged – how many kWh you get for every kWh you put in? These changes depend on the way the solar system batteries are used (for example, quick discharge might result in lower efficiency), but you can typically get an average value.

7. Cycle life (Total number of charge/discharge cycles)

The number of charge/discharge cycles a battery has before being considered ‘end of life’. Some battery manufacturers specify cycle life in terms of full cycles, whilst others may consider even a half cycle to be one full cycle. Lithium batteries generally have a cycle life of 4,000-10,000 cycles, but lead batteries may only have 1,000 cycles. Cycle life of lead batteries can be increased by developing the system to have a reduced depth of discharge.

8. Lifespan

The battery’s estimated life (and warranty) might be expressed in cycles or years (this is estimated based on the expected typical battery usage). The lifetime should include the expected level of capacity at the end of life.

9. Ambient Temperature Range

Solar energy storage batteries are sensitive devices that will not perform as effectively as they could if the temperature outside becomes too hot or too cold. Operating outside of the specified temperature range may harm the batteries (shortening their life), lower their efficiency, and/or invalidate the warranty.

How Long do Solar Batteries Last?

The lifespan of a solar battery is determined by three factors: the size of the battery, the amount of power used, and the speed with which the battery can be recharged.

Under typical conditions and if not subjected to high temperatures, most solar battery storage systems are capable of lasting for 10 years or more. That is, they should be able to survive as long as their warranty term, which is typically 10 years for most models.

However, there is insufficient market data to determine if modern solar batteries routinely survive that long in real-world residential installations. Newer generations of solar energy storage batteries have only been available for a few years.

According to user evaluations on several websites, it appears that most homes with storage batteries are satisfied with them thus far, particularly with the top brands. Some customers report issues with battery failure or customer service from the provider, but the batteries appear to be operating as intended in the majority of instances.

Is a Battery Suitable for a Commercial Property?

Yes, solar battery storage systems are suited for commercial properties as well, just like residential properties.

Commercial battery storage, often known as solar energy storage batteries, allows you to store the energy produced by commercial solar systems. Businesses may now store and release electricity at specified times, functioning independently from the grid and with backup power when needed. Solar batteries help companies to become energy independent, earning, more savings and running more sustainably.

For the best solar battery for your residential or commercial solar panel system, get a free quote from Isolux today.


Contact Isolux Solar for solar system battery. Get an obligation free quote today.

Note: Batteries only without any system.