A solar battery can help a household use more of its own solar electricity after sunset, but it adds to the upfront cost of a solar system. Whether it makes financial sense depends on the value of the electricity you would otherwise export, the price of imported electricity, battery cost and how often the battery is used.
When solar without a battery may suit
If a large share of your electricity use happens during daylight, you may be able to use solar directly. A solar-only system can be a simpler starting point, especially where the additional cost of storage is difficult to justify.
When a battery may be worth assessing
A battery may be worth comparing if you export substantial solar energy during the day and use significant electricity in the evening. It may also appeal if backup power is important, provided the system is designed with suitable backup hardware and circuits.
Compare the right numbers
Use interval data and your actual electricity tariff. Compare the battery's usable capacity, power output, installed price, warranty, expected cycling and the value of the solar energy stored. Include daily supply charges and any retailer or virtual power plant terms where relevant.
Do not assume a battery eliminates bills
Grid electricity may still be needed during long periods of low solar generation or high demand. Battery losses, reserve settings and backup use also affect how much stored energy is available.
Get an individual comparison
Ask for a written comparison of solar-only and solar-plus-battery options using the same usage data and clearly stated assumptions. Explore our solar battery Brisbane service for a tailored assessment.