How to Prepare a 72-Hour Power Outage Emergency Kit
The lights go out, the fridge falls quiet and your phone is already down to half charge. That is a poor time to discover the torch batteries are flat. A 72-hour power outage emergency kit gives your household a practical way to keep a few essentials running for three days. In Australia, that might mean preparing for a summer storm, a bushfire-related outage or wild weather in winter. Start with what your family actually needs, then build a kit you can find and use in the dark. Keep food, drinking water, medicines and first aid in your broader emergency kit as well.
Before you start
Work out energy use in watt-hours (Wh), then check the watts (W) needed when devices run together.
Put medical needs first, followed by reliable communication and lighting.
Decide how you will recharge. A battery labelled 1 kWh will not necessarily cover three days.
Keep the right leads, a paper contact list and simple operating instructions beside the kit.
What needs to stay on during a blackout?
Use these figures as a worked example, not a shopping specification. Your fridge, fan and chargers may use quite different amounts. The times below are planned daily use, rather than a suggestion to leave every device running.
Essential Device | Typical Power Demand | Daily Runtime | Estimated 72-Hour Energy Use | Priority Level |
Medical equipment | Device-specific | As prescribed | Calculate separately | Critical |
Phone charging | 10W | 2 hours | 60Wh | High |
Battery radio | 5W | 2 hours | 30Wh | High |
Internet router | 15W | 8 hours | 360Wh | Depends on network availability |
Refrigerator | 30W average in this example | 24 hours | 2,160Wh | High when refrigeration is essential |
LED light | 8W | 6 hours | 144Wh | High |
Fan | 40W | 6 hours | 720Wh | Depends on heat and household needs |
Using the table’s example runtimes, phones, radio, internet equipment and LED lighting need about 594Wh over 72 hours. Add the fan and the total rises to 1,314Wh; add the refrigerator as well and it reaches 3,474Wh. These estimates exclude medical equipment, conversion losses and an emergency reserve.
Make a separate plan for medical equipment
If someone at home relies on powered medical equipment, speak with their treating clinician and equipment supplier before choosing backup power. Ask which supply is suitable, how long it has been tested to run the device and when you should move to another location. Contact your electricity retailer or distributor about life-support registration where applicable. Registration does not prevent unexpected outages, so keep the medical backup plan with your emergency supplies.
Keep phones and a radio ready
Charge mobiles when severe weather is forecast and pack a battery-powered radio for local updates. Write down your electricity distributor’s faults number and key family contacts. For home internet, check every mains-powered part of your nbn setup, including a separate connection box if fitted. A powered Wi-Fi router cannot restore a network that is down. Keep a mobile charged, but allow for mobile service interruptions too.
Allow enough power for the fridge
A fridge is easy to underestimate. Its compressor switches on and off, and a hot kitchen can change how much energy it needs. Measure a full day’s use with a suitable plug-in energy meter if you can. During a blackout, keep fridge and freezer doors shut as much as possible. Have an esky and ice bricks ready, and follow Food Standards Australia New Zealand and your state or territory food authority’s advice on food safety. Do not judge food safety by smell alone.
Think about lighting, heat and water
Keep a torch or head torch within reach rather than relying entirely on the power station’s light. A fan may matter much more during a hot Queensland evening than on a cool night in Hobart. If your property uses an electric pump for tank water, include it in the plan and check its starting demand. A small battery that charges phones comfortably may struggle to start a pump.
Work out your three-day energy budget
Power in watts × hours used each day × 3 = energy needed over 72 hours, in watt-hours For an 8 W light used six hours a night, the sum is 8 × 6 × 3 = 144 Wh. That is the light’s demand; the battery also has its own losses.
Use real running times
Go room by room and write down the essentials. Read their labels, then check actual consumption where possible: a charger’s maximum rating is not necessarily what it draws throughout a charge. For a cycling appliance such as a fridge, measured daily energy is more useful than treating the compressor’s running wattage as a constant load.
Add up the loads you will actually use
In the example above, the phone, radio, router and light need 594 Wh over three days before losses. Add the fan for six hours a day and the total becomes 1,314 Wh. That changes the size of battery you need, or how often it must be recharged. Do the sum for your own household before comparing products. EcoFlow AU’s power station sizing guide provides another worked explanation.
Check what can run at the same time
Stored energy and power output answer different questions. Watt-hours tell you about the energy available; watts tell you what the station can supply at once. Add up appliances that will overlap, then check the extra starting demand of a fridge or pump. A large capacity figure alone does not guarantee that a motor will start.
Leave breathing room in the calculation
Some stored energy is used by the inverter and the station itself, so rated capacity is not the same as energy delivered to your appliances. Keep some charge in reserve, too. If the planned load nearly matches the battery’s label, the plan is too tight. Test it, reduce optional use or arrange a realistic charging source.
What to pack in your emergency power kit
Use one clearly labelled tub for the small items and keep the heavier equipment nearby. A list taped inside the lid saves everyone rummaging for a lead. The checklist below is a starting point; follow each battery manufacturer’s instructions for storage, checking and recharging.
Kit Item | Main Purpose | Recommended Quantity | Storage Requirement | Testing Frequency |
Portable power source | Run selected devices | Sized to your load plan | Dry and accessible | Check every few months |
Cables and adaptors | Connect devices | One compatible set per device | Labelled pouch | Check every few months |
Charged power banks | Reserve phone power | At least one | Dry pouch | Recharge every few months |
Battery torches | Independent lighting | At least one, plus spare batteries | Easy to reach | Test every few months |
Radio and contact list | Receive updates | One of each | With the kit | Review every few months |
Compatible charging equipment | Replenish the battery | As required by your plan | Protected from moisture | Test before outage season |
Choose a power station after doing the sums
The EcoFlow DELTA 3 Plus Portable Power Station has 1,024 Wh of rated storage and 1,800 W continuous AC output. For the 594 Wh example above, it is a model worth assessing and testing with your actual devices. Add the fan, though, and the 1,314 Wh requirement already exceeds its rated storage before losses. You would need to change that plan or recharge. Check the Australian model’s outlets and device compatibility, and compare other sizes in EcoFlow AU’s portable power station collection.
Pack the leads you need
Put a compatible charging lead beside each device on your list. Label less familiar adaptors so someone else can set up the kit without guessing. Keep a charged power bank for the phone even if you have a larger station; it is easier to carry if you need to leave.
Keep lighting and radio power separate
A flat main battery should not leave you without a light or news updates. Pack torches, a battery radio and the correct spare batteries. Tune the radio to a local station beforehand and leave a paper contact list in the tub. The Australian Red Cross emergency packing checklist is useful for the wider household kit.
Store it dry and use it safely
Keep leads and small electronics in a dry container, away from places that could flood. Take the power station out of its storage tub before using it so its vents stay clear. Use intact leads and compatible Australian outlets, keep connections dry and stay within the equipment ratings. Never try to power your house by plugging a portable supply into a wall power point.
Your 72-hour power kit checklist
Write down essential devices, daily running times and three-day energy use.
Charge the station and check its continuous output and appliance starting limits.
Label and pack compatible leads, adaptors and a charged phone power bank.
Add torches, spare batteries, a radio and a paper contact list.
Keep any clinician-approved medical backup plan with the kit.
Test compatible solar panels or other charging equipment before you need them.
Agree on which optional devices stay off if recharging is unavailable.
Choose a dry, accessible storage spot and set reminders to check the kit.
Plug suitable devices into the station; never backfeed a household power point.
Make the kit easy for everyone to use
Leave a one-page instruction sheet on top. It should say where the equipment is, which devices take priority and how to check the battery level. Run through the setup with another person in the household. A kit that only one person understands is less useful when that person is away.
Label essentials and optional extras
A couple of simple labels will do: essential and optional. Keep medical equipment on its separate approved plan. Phone charging and lighting usually come ahead of television or other entertainment, but your household’s health and communication needs should decide the order.
Check the battery before it runs low
Look at the remaining charge at least daily and compare it with the time still to cover. Turn off unused outputs if the manufacturer’s instructions allow. Avoid spending the reserve on appliances you can do without. If heat or a medical need makes the house unsafe, act on your relocation plan rather than waiting for the battery to reach zero.
Choose the storage spot before storm season
A dry, accessible cupboard is more useful than a corner of a cluttered shed. Keep the kit above likely flood levels and within the manufacturer’s storage-temperature limits. In use, place the station on a stable, dry surface with clear vents. Do not seal an operating battery inside a weatherproof box.
Schedule charging without compromising essentials
During a 72-hour outage, charge phones and rechargeable lights in turns. If you have compatible solar panels and conditions are safe, use daylight hours to recharge the power station. Check its battery level each evening and keep a reserve for overnight essentials; cloud and shade can reduce solar output. If you cannot recharge, switch off optional devices and shorten the use of flexible loads. Equipment that must run continuously needs backup sized for that purpose—rotating other loads cannot fix an undersized medical backup. EcoFlow AU’s power outage survival kit guide covers supplies beyond electricity. If authorities tell you to leave, follow their advice rather than staying because you have backup power.
Do a practice run
Before packing everything away, test the setup under safe conditions using the appliances you intend to connect. Check that the leads reach, the instructions make sense and the battery lasts as expected. Write down what you learn. A missing adaptor is a small problem on a normal afternoon and a much bigger one when the shops are closed and the house is dark.
Questions about a 72-hour emergency power kit
Why plan for three days?
Three days gives you a useful starting point for food, water and power planning. It is not a restoration deadline. Regional properties or homes affected by severe damage may need a longer plan. Follow local emergency advice and decide in advance what you will do if supplies run low.
How big should the battery be?
There is no single size for every home. Add the energy required by your chosen devices over three days, then allow for losses and a reserve. Phones and lights are one job; a fridge, water pump or hours of cooling are another. Test the combination you actually intend to use.
Can rooftop solar recharge the kit during a blackout?
Do not assume it can. A standard grid-connected solar-only system generally shuts down when the grid fails. A home solar-and-battery system needs the right backup configuration to supply power during an outage. Portable panels are a separate option if they are compatible with your station and conditions are suitable. Australian Government solar-battery guidance explains why the installed setup matters.
Can I connect the station to my switchboard?
Only where a licensed electrician has designed and installed a suitable approved connection for that equipment. Otherwise, plug compatible appliances directly into the station. Do not improvise a lead to feed a household power point. Queensland’s electrical-safety guidance explains the serious danger of backfeeding.
Should I also have a petrol generator?
It may be useful for a longer outage, but only if you have a safe place to operate and store it. Run it outdoors, well away from doors, windows and vents, never in a garage or other enclosed or partly enclosed space. Switch it off and let it cool before refuelling. Follow Energy Safe Victoria’s generator advice and the manufacturer’s instructions. A generator is not a substitute for leaving an unsafe property.