Program, tariff and product settings can change. This page is a general preparation checklist and does not state current eligibility, pricing, savings or suitability. Confirm current details and assumptions in writing for your property.
The basic idea
A battery is often described as storing excess daytime solar for evening use. Some retailer plans add another possible source: grid energy during a defined free or lower-cost period. That can matter on cloudy days or during winter when solar generation is lower.
Four things have to line up
- The retailer plan must be available and suitable for the household
- The battery and controls must support the intended charging schedule
- The charge window and equipment charge rate must allow useful energy to be stored
- The household must have later usage that makes stored energy useful
Read the whole tariff
Do not judge a plan by one attractive window. Check usage rates outside that period, daily charges, export treatment, time windows and any conditions. A plan that suits one load profile may be a poor fit for another.
Battery size still matters
A larger battery is not automatically more useful. Evening and overnight loads, solar generation, charge rate, available space, site limits and budget all shape the practical size discussion.
Cloudy and winter periods: scheduled grid charging may help maintain useful stored energy when solar is low, but the result still depends on the plan, settings and how the household uses power later.
Settings need a clear handover
The household should understand where schedules are controlled, how solar charging interacts with grid charging, and what may need review if the retailer plan changes.
Bring the current bill
The right starting point is the actual tariff shown on the bill, recent usage, existing solar and the job you want the battery to do. That keeps a useful tariff feature from becoming the whole decision.