Guide to Tesla home batteries for solar

How does a Tesla home solar battery work?

RACV Solar offers installation of the Tesla Powerwall 2. This battery is compatible for integration into both pre-existing solar systems and newly installed solar setups.

It is a rechargeable lithium-ion battery designed to store excess solar energy generated by photovoltaic (PV) solar panels. Lithium-ion (or li-ion) batteries are lightweight and compact, can be efficiently charged and have long lifespans. 

Solar battery size is measured in kilowatt-hour (kWh) units and the Powerwall 2 has an energy capacity of 13.5 kWh, allowing homeowners to customise their energy storage based on their energy needs and usage patterns.

It can be connected to your existing solar panels, or installed at the same time as a new solar system, ensuring a continuous and uninterrupted power supply, reducing reliance on the grid.

The science behind the efficiency of the Powerwall 2 is based on its high energy density and low self-discharge rate. It provides continuous power output of 5 kWh and a peak power discharge of 7 kWh, which helps if there is a sudden spikes in energy demand. The Powerwall 2 stores a significant amount of energy in a compact size, allowing for easy installation and space optimisation. Its low self-discharge rate ensures minimal energy loss over time, maximising the efficiency of the battery system.

Tesla home battery compliance and ratings with Australian standards

The Powerwall 2 is AS477 compliant. This is the inverter requirement standard in Australia. It specifies the expected performance and behaviour of inverters at low voltages. This means that it meets the necessary safety and quality standards for use in Australia.

The IP rating (weather rating) for the Powerwall 2 is IP67. This signifies the battery’s ability to withstand various environmental conditions. Its operational range spans from -20°C  to 50°C, ensuring reliability in diverse climates. Ideally it is installed in a sheltered location, such as a garage, and out of direct sunlight.

Tesla home batteries technical specifications

Energy capacity

One of the most important specifications to consider is the energy capacity, which refers to the amount of energy the battery can store. The Tesla Powerwall 2 offers an energy capacity of 13.5 kWh with 100 per cent depth of discharge and 90 per cent round-trip efficiency (the measurement of the amount of energy put into a system compared to the amount dispatched). That's a lot of storage in one battery, but it's possible to combine multiple Tesla Powerwalls together in one system for more storage capacity. A home solar battery expert can give you advice on what's right for your situation.

Battery life

The Tesla Powerwall 2 requires minimal maintenance, with software updates and remote monitoring ensuring optimal performance over time.

Tesla's 10-year warranty applies to any Powerwall 2 that was purchased from a Tesla certified installer in Australia, such as RACV Solar.

Performance under different weather conditions

The Tesla Powerwall 2 is built to withstand various weather conditions, including extreme temperatures and humidity. Whether you live in a hot and sunny climate or experience colder temperatures, the Tesla battery is engineered to perform optimally, ensuring consistent energy storage and supply.

Backup power supply during outages and blackouts

One of the main features of the Tesla Powerwall 2 is its ability to provide backup power during outages and blackouts. The BYD Battery, which RACV Solar also installs, has emergency blackout protection available as well. This means that even when there is a power disruption, homeowners with a Tesla Powerball 2 or BYD Battery can continue to power essential home appliances and stay connected. The battery can also be used to power an EV via a home-charging unit, or even trickle charging via a power point.

How much do Tesla home batteries cost?

The cost of the Tesla Powerwall 2 home battery for solar can vary depending on various factors such as the size of your solar system and the capacity of the battery pack. It can also vary based on whether you’re getting it installed at the same time as solar panels or whether you’re adding it to an existing solar system. Higher demand and higher production costs have also influenced the price in recent years. It is recommended you consult a certified solar installer to get an accurate quote based on your specific requirements.

Tesla home batteries installation and maintenance

Installation time

The installation process of a Tesla Powerwall 2 usually takes a full day, so you’ll need to plan for your power to be out for around 4 to 6 hours. However, installation times can vary depending on the complexity of the job and the size of the battery pack. It is important to hire a certified Tesla installer who has experience in installing home solar batteries to ensure a smooth and efficient installation.

Maintenance costs

Tesla home batteries are known for their low maintenance requirements. The only ongoing requirements are to keep the unit connected to the internet and regularly clean it to keep it free and clear from debris, especially around the air intake and exhaust. To clean the Tesla Powerwall 2, use a soft, lint-free cloth. Do not use cleaning solvents or expose the battery to flammable or harsh chemicals.

Homeowners are advised to discuss Tesla home solar battery maintenance requirements and costs with a certified solar battery installer.

Tesla home batteries warranty and support

Duration and cover of warranty

Tesla's 10-year warranty for its Powerwall home batteries covers defects in materials and workmanship. This means that if your Tesla home battery experiences any issues due to manufacturing faults within this timeframe, Tesla will repair or replace it free of charge. It's important to note that the warranty is limited to the original purchaser and is not transferrable to subsequent owners.

Monitoring energy usage

The Tesla App allows you to easily monitor your household’s energy usage in real-time. The app’s detailed insights and visualisations track your solar energy production, battery storage levels, and overall energy consumption. This enables you to make informed decisions about your energy usage and behaviour and optimise your solar system accordingly.

Setting preferences

With the Tesla App, you have the flexibility to set your preferences and customise your energy management. You can adjust settings such as charging thresholds, backup power usage, and time-of-use preferences. These personalised settings ensure that your Tesla home batteries for solar are aligned with your specific energy needs and lifestyle.

Accessing support

If you require assistance or have questions about Tesla home batteries for solar, certified Tesla installers such as RACV Solar can assist. The Tesla App also provides access to support resources, and troubleshooting guides to frequently asked questions.