![]() ![]() What Is a Solar Battery Storage System?.However, for some people the value and security of having a reliable, sustainable power supply easily outweighs the cost. With this in mind, it’s generally more cost-effective to install rooftop solar and run efficient appliances or heat hot water during the day rather than store excess energy in a battery. The payback period or return on investment (ROI) for most battery systems is around 8-12 years. This is much lower than the cost of electricity, which is on average $0.30 per kWh in Australia hence why is it worthwhile using your solar to run appliances or heat hot water during the day while it is being generated. The feed-in credit (FiT) rate is usually around $0.10 per kWh but was recently reduced to $0.06 in some states. In most states, you will receive credits for any excess electricity fed back to the grid. For example, it is possible to run energy-intensive appliances such as dishwashers, air-conditioners and washing machines for free using your solar energy during the day. For most households, rooftop solar can reduce your electricity bills by up to 60% or more depending on the amount of energy you use during the day. For many people, the cost of a battery system is simply too high, but this doesn't mean you can't take advantage of rooftop solar. ![]() ![]() Unless you experience frequent blackouts the answer is generally no. Note, you will want to focus on the shorter winter months to ensure you have enough excess solar energy to charge the battery in winter. Our free solar and battery calculator, shown below, can help you quickly calculate the optimum size solar and battery system for your home or business. In many cases, the warranty may be void if the battery is not installed in a semi-protected location. The battery location is also important and some households may require dedicated enclosures or covers to be installed to help protect the battery from extreme weather and direct sunlight, which could result in overheating and shutdown. There may also be additional costs and switchboard upgrades, especially if dedicated circuits are required to be backed up during a blackout. For example, the Tesla Powerwall 2 with 13.5kWh of storage capacity will cost around US$ 15,000 fully installed, while the 9.8kWh LG RESU battery costs around US$ 6000 plus the additional costs of a compatible hybrid inverter and installation. For those that are more energy conscious and use efficient appliances, a smaller 5 to 6kWh battery may be suitable and also provide enough backup power to support basic essential loads such as lighting, computers and fridges.Īs a general guide, in Australia, a battery system will cost around $1000 per kWh installed, or in the US it’s closer to US$700 per kWh. In reality, every household is different, and usage patterns can vary greatly. With this in mind, a moderately sized 10kWh battery would generally be large enough to cover the evening and overnight periods. However, some of this energy is used during the day and could be directly powered by solar alone. To give some perspective, an average 3-bedroom home uses around 20kWh of electricity per day. Costs have slowly been reducing but not as quickly as many had hoped. Average household batteries cost anywhere from $4000 for a small 4kWh battery up to $15,000 or more for a sizeable 12kWh battery, depending on the type of battery, installation location, backup power requirements and type of inverter used. The cost of home battery systems depends on the battery size or capacity, measured in kilowatt-hours (kWh) and the brand of solar or hybrid inverter used. How much does a Home battery system cost?
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