Solar Battery Storage vs Feed-in Tariff: Which Saves Darwin Homeowners More?
Key Takeaways
- A solar battery stores your spare daytime power so you can use it at night, while a feed-in tariff pays you a set rate for every unit you send to the grid.
- On Jacana Energy’s published rates, exporting earns 9.33 c/kWh anytime or 18.66 c/kWh from 3pm to 9pm with a smart meter, while buying power on the standard tariff costs 31.6788 c/kWh including GST.
- That gap is why using your own solar power usually beats selling it, and it is the main argument for a battery.
- A battery costs more upfront, so it suits homes with high evening use, while export-only suits homes that use most solar power during the day.
- Check current rates on the official Jacana page, because tariffs and incentives change.
Solar Battery vs Feed-in Tariff: What Is the Difference?
A solar battery stores surplus power from your panels so you can use it later, usually in the evening. A feed-in tariff is the rate your electricity retailer pays you for solar power you send back to the grid. In short, one option keeps the power for yourself, and the other sells it.
Most Darwin homes with solar do a bit of both. Your panels power the house during the day, and whatever you do not use is exported. A battery changes what happens to that spare power. Instead of exporting it for a modest payment, you store it and use it after sunset, when you would otherwise buy power from the grid.
What the Numbers Look Like in Darwin
Jacana Energy publishes its residential rates on its official pricing page. At the time of writing, the figures relevant to this comparison are:
| Item | Rate |
|---|---|
| Standard usage tariff (inc GST) | 31.6788 c/kWh |
| Feed-in tariff, anytime | 9.33 c/kWh |
| Super feed-in tariff, 3pm to 9pm (smart meter required) | 18.66 c/kWh |
Rates can change, so check the page before you make a decision. The point of the table is the gap between what you pay to buy a unit of power and what you are paid to sell one.
Here is a simple example using those numbers, for 10 kWh of spare solar power.
| Option | What happens | Value |
|---|---|---|
| Export on the anytime rate | You earn 9.33 c/kWh | About $0.93 |
| Store it and use it in the evening | You avoid buying at 31.6788 c/kWh | About $3.17 |
| Difference | Per 10 kWh | Roughly $2.24 |
This is simple arithmetic, not a savings guarantee, because some energy is lost when it is stored and your own usage will differ.
How the Super Feed-in Tariff Changes the Picture
The 3pm to 9pm Super feed-in tariff narrows the gap, but only if you have a smart meter and you are exporting in that window. At 18.66 c/kWh, the same 10 kWh would earn about $1.87, compared with about $3.17 of avoided purchases.
- Timing: panels produce most of their power in the middle of the day, while the higher export rate applies late in the afternoon and into the evening.
- West-facing panels: they can help you make use of the higher rate.
- A battery: one that discharges during the Super feed-in window can do the same.
Ask our solar installation in Darwin team how your roof and system would perform across those hours.
If you are curious about how panels behave through the year, our post on solar performance in Darwin’s wet season separates the myths from the reality.
When a Battery Makes Sense
A battery tends to make sense when you use a lot of power after sunset and export a lot of power during the day. Think of these situations:
- You run air conditioning in the evenings and overnight.
- You are out at work during the day, so your panels export most of what they make.
- You want some backup power in case of an outage, if your system is set up to provide it.
- You want to use more of your own solar power and rely less on the grid.
- Choice of systems: we install Fronius and BYD batteries, from about 12kWh to 60kWh or more for homes, sized to how you use power.
Incentives also affect the cost. The federal Cheaper Home Batteries Program funds around a 30% discount on eligible small-scale batteries connected to rooftop solar, according to the official energy.gov.au page. The NT Government’s own battery scheme is listed as closed, so check current details before you plan around it.
When Export Alone Is Fine
A battery is not the right answer for every home. If you are home during the day and run your appliances while the sun is shining, your panels already supply most of your power directly. In that case, there is less spare power to store, and a battery may take longer to pay for itself.
- Lower upfront cost: export-only systems cost less to install.
- Fewer parts to look after: there is no battery to maintain.
- Modest evening use: if your evening use is modest, or your budget is tight, solar panels alone can still be a good decision.
- Room to grow: you can plan your system so a battery can be added later, which is worth discussing with your installer.
Not sure how long a system takes to pay off? Our guide to how long until you earn back what your solar panels cost walks through the thinking.
How to Decide for Your Home
- Look at your bill. Find out how much power you use at night compared with the daytime.
- Check your meter and plan. Confirm whether you have a smart meter and which feed-in rate applies to you.
- Ask for two quotes. Request one for solar only and one for solar plus a battery, with the incentive shown as a separate line.
- Compare the gap. Use the buy rate and sell rate to estimate how much a battery could shift, and be honest about the losses.
- Choose a licensed installer. Solar and battery systems connect to mains wiring, so the work needs a licensed electrician.
Frequently Asked Questions
Is a solar battery worth it in Darwin?
It can be, if you use plenty of power after sunset. Jacana’s standard tariff of 31.6788 c/kWh is much higher than the 9.33 c/kWh anytime feed-in rate, so using your own stored power is worth more than exporting it. A free quote helps you compare the extra cost.
What is the Super feed-in tariff?
Jacana Energy lists a Super feed-in tariff of 18.66 c/kWh for power exported between 3pm and 9pm, and a smart meter is required. It pays more than the 9.33 c/kWh anytime rate, so it can improve the return on exported solar power during that window.
Can I add a battery to my existing solar system?
Often yes. The federal Cheaper Home Batteries Program covers eligible batteries connected to new or existing rooftop solar. Whether your current inverter suits a battery depends on the equipment, so ask a licensed installer to inspect your system and explain what changes are needed before you buy.
Will a battery pay for itself?
That depends on the battery cost, any discount, your evening usage and your electricity rates. Because rates and incentives change, there is no single answer. Ask for a written quote showing the price before and after the discount, then compare it with the power you would shift.
Get Advice from a Local Solar Team
Deciding between a battery and export-only? Our licensed Darwin electricians can review your usage and explain the options without pressure. Send a booking request or call (08) 8983 3000 for a free quote.