Yes, a solar battery for high-load appliances works, but only when the battery’s power rating matches the load. Capacity decides how long an appliance runs. Power decides whether it runs at all. Many Australian homeowners overlook that difference, so this guide explains it in plain terms. Furthermore, it covers the 2026 rebate settings that change how you size a battery.
Quick Answer: Can a Solar Battery Run High-Load Appliances?
A solar battery runs high-load appliances when its continuous output exceeds the combined draw of everything running at once. We measure output in kilowatts (kW). For example, a ducted air conditioner, an electric oven and a kettle together draw about 8.7 kW. A 5 kW battery cannot carry that load alone during an outage. A 10 kW battery can.
- Power (kW) decides how many appliances run at the same time.
- Capacity (kWh) decides how long those appliances keep running.
- Motor-driven appliances need extra power for a few seconds at start-up.
- Not every home battery system provides backup during a blackout.
Power vs Capacity: The Two Numbers That Matter
Think of a battery as a water tank with a tap. Capacity, measured in kilowatt-hours (kWh), is the size of the tank. Power, measured in kW, is how wide the tap opens. The Queensland Government’s battery buyers guide separates power into two figures. Peak output is the maximum a battery delivers for a very short burst. Continuous output is what it sustains over time.
Therefore, compare the continuous figure first. 2026 market comparisons list popular models from roughly 5 kW to over 10 kW continuous.
Runtime follows a simple formula: usable kWh divided by load in kW. For instance, a battery with 10 kWh usable runs a 3.5 kW ducted air conditioner for about 2.9 hours. Meanwhile, the same battery runs a 1 kW load of fridge and lights for roughly 10 hours. Real results vary because inverter losses and backup reserve settings reduce the energy you can draw.
Which Appliances Count as High-Load?
High-load appliances draw several kilowatts at once. The NSW Government ranks ducted reverse-cycle air conditioners and hot water systems among the top energy users. The typical running loads below show where your battery works hardest.
- Ducted air conditioning: roughly 3 to 5 kW while running.
- Electric oven: roughly 2 to 5 kW.
- Electric kettle: about 2.2 kW.
- EV home charger: up to 7.4 kW on single-phase supply.
- Electric storage hot water: about 14 kWh to heat 300 litres to 60°C, versus 4.7 kWh for a heat pump.
These figures are typical ranges, not guarantees. Always check the rating label on your own appliances.

As Figure 1 shows, the three-appliance stack overwhelms a 5 kW battery. Likewise, an 8 kW battery falls 0.7 kW short. A 10 kW battery covers the load with 1.3 kW to spare. Grid-connected homes keep drawing any shortfall from the grid, so this limit matters most during outages.
Why Motor Start-Up Surges Matter
Air conditioners, pool pumps and compressors contain motors. Motors briefly draw several times their running power when they start. Engineers call this a surge. Surges last only seconds, so they never appear on your bill. However, they can still trip an undersized inverter during a blackout.
So ask your installer for the battery’s peak rating as well as its continuous rating. Also ask which appliances sit on the backup circuit.
Grid-Connected Use vs Blackout Backup
On a normal day, your battery and the grid share the load. The grid fills any gap, so a heavy appliance rarely stops. During a blackout, the battery carries everything alone. Moreover, the Queensland Government notes that not every home battery system provides backup during outages.
Some systems back up only selected essential circuits. Others back up the whole home. Consequently, confirm your backup setup before you rely on it for ducted air conditioning or an oven.
2026 Rebate Changes: Why Capacity Is Only Half the Story
The federal Cheaper Home Batteries Program changed on 1 May 2026. The Clean Energy Regulator now tapers support by battery size. The first 14 kWh of usable capacity earns 100% of the STC factor. Capacity from 14 to 28 kWh earns 60%. Capacity from 28 to 50 kWh earns 15%. Above 50 kWh, no STCs apply.
The STC factor sits at 6.8 for batteries installed from May to December 2026. It then drops to 5.7 from January 2027. For example, a 20 kWh usable battery earns the full rate on its first 14 kWh. It earns 60% on the remaining 6 kWh. That equals 17.6 full-rate kWh. The dollar value depends on the STC price at the time your installer claims it.

Importantly, the rebate pays for kWh, not kW, so a solar battery for high-load appliances needs a separate power check. A bigger battery does not automatically run more appliances, because the inverter sets the power limit. Rules for adding battery capacity later can be different, so check with the Clean Energy Regulator or ask us before you decide. It’s usually simpler to size the system for your heaviest loads from the start. To see how the rebate changes over time, read our guide on battery rebate timing..
Smart Ways to Run Heavy Appliances on a Battery
You can reduce the load your battery sees without giving up comfort.
- Stagger heavy appliances. For example, run the oven and the dryer at different times.
- Use the midday window. Under the Solar Sharer Offer, some NSW electricity retailers offer eligible households free power from 11am to 2pm. You need to opt in with your retailer, and a usage cap applies. Check with your retailer whether you qualify..
- Upgrade electric storage hot water to a heat pump. It uses about one-third of the energy.
- Charge your EV from solar at midday. A 7.4 kW charger drains a battery quickly at night.
Four Checks Before You Buy a Solar Battery for High-Load Appliances

- First, list your heaviest appliances and add their running loads together.
- Second, match the battery’s continuous kW rating to that total, plus a margin for surges.
- Third, divide usable kWh by that load to estimate runtime. Ask your solar battery company for both ratings in writing.
- Finally, confirm backup circuits, Clean Energy Council (CEC) listing and Solar Accreditation Australia (SAA) installer accreditation.
Talk to a Local Solar Battery Specialist
Solar Battery Outlet designs and installs home batteries across Liverpool, Bankstown and Mudgee. As a local solar battery company, we size each solar battery for high-load appliances, not just your daily kWh. Choosing the best solar battery installer means checking accreditation, backup design and honest runtime estimates. Call 1800 000 777 or contact our team to discuss a battery that suits your home.
Frequently Asked Questions
Yes, if its continuous output exceeds the air conditioner’s draw, including start-up. Ducted systems draw roughly 3 to 5 kW. Usable kWh then decides how long the unit runs.
Yes. Ovens draw roughly 2 to 5 kW. However, adding a ducted air conditioner can push the combined load past a 5 kW battery’s limit.
Divide usable kWh by the appliance’s kW draw. A 10 kWh usable battery running a 3.5 kW load lasts about 2.9 hours. Losses and reserve settings shorten that figure.
Not always. Capacity (kWh) sets runtime, while the inverter’s kW rating sets how many appliances run together. The 2026 rebate pays for kWh, so check the kW rating separately.
Yes. However, a home charger can draw up to 7.4 kW on single-phase supply. Charging from midday solar usually protects your battery for the evening.
Start with accreditation. The Clean Energy Regulator requires an SAA-accredited installer and a CEC-approved battery for rebate eligibility. The best solar battery installer also explains backup circuits and surge limits clearly.
Disclaimer
This article offers general information about solar batteries and high-load appliances. It does not replace electrical, engineering, financial or legal advice. Appliance loads, battery ratings and runtimes vary by model, installation, usable capacity, temperature and settings. The figures above are typical examples, not guarantees of performance or savings.
Rebate settings, STC factors and retail plans change over time. Eligibility depends on your property, system and installation date. Check current rules with the Clean Energy Regulator and your electricity retailer before you decide.
Always seek personalised advice before making a purchasing decision.




























