Explore the backup power hub

A portable power station stores electricity in a battery and supplies it through the outputs described by its maker. That does not make it a universal home backup system. Before relying on one, check the appliance label, its manual, the station manual and any safety advice from the supplier. Heating, boilers and medical devices have different requirements, so one answer cannot cover every model.

Read watts and watt-hours as different measures

Watts (W) describe the rate at which an appliance uses or receives power at a moment. Watt-hours (Wh) describe an amount of energy. A label might show the appliance’s rated input in watts, while a battery station gives its stored energy in watt-hours and a maximum output in watts. Compare like with like: the station’s permitted output must meet the appliance’s demand, and its stored energy limits how long it can supply that demand.

You can make a rough arithmetic estimate from the labels. Divide the station’s stated watt-hours by the appliance’s watts to get a theoretical number of hours at a constant load. For example, if your own appliance label says 100 W and the station label says 500 Wh, the simple division is 500 ÷ 100 = 5 hours. This is only an illustration of the calculation, not a real-world runtime. It ignores conversion losses, battery reserve, temperature, age, cycling and any other device connected at the same time. Follow the manufacturer’s runtime guidance and do not plan around a theoretical maximum.

Some appliances draw more power when they start or switch modes. A power station may have a separate peak or surge rating, but the allowed load and duration depend on that model. Read the station’s exact instructions and ask its maker if the ratings are unclear. Do not test an important appliance during an outage to discover whether it works.

Look at the full appliance rating label, not only a marketing description. Note the input voltage, watts, frequency and any information about a motor or start-up load. Use the appliance manual where its label does not answer the question. If an appliance has a plug, that alone does not prove that a battery station can power it safely or for a useful length of time.

Why electric heaters use so much stored energy

Many portable electric heaters convert electricity directly into heat. Their wattage can be high compared with the energy stored in a compact battery. Use the numbers printed on your heater and station to do the arithmetic. If your heater is rated at 1,500 W, it draws fifteen times as much power as a 100 W appliance while running at that rating. A station whose continuous output is below the heater’s input cannot supply it. Even if the output rating is high enough, the battery’s watt-hours may be used quickly.

Do not treat a heater’s thermostat as proof of a particular runtime. It may switch on and off, but the room temperature, insulation, outdoor temperature and heater setting all affect the amount of energy used. The station may also limit output or shut down under conditions stated in its manual. No single runtime can be promised without the exact equipment and conditions.

For a short outage, ordinary layers, blankets and a room plan may be more practical than trying to heat a room from a portable battery. Follow the electric heater and electric blanket manufacturer’s safety instructions when mains power is available. Keep heaters away from bedding and curtains, and do not leave an appliance unattended unless its instructions explicitly allow that use. Never use a barbecue, camping stove, outdoor fuel heater or generator inside a home, tent, garage or other enclosed space.

Read the guide to staying warm when heating is unavailable and the indoor safety guide for outdoor stoves and heaters. The NHS warns that carbon monoxide can come from fuel-burning appliances, including boilers, heaters and portable generators. If you suspect exposure, go outside and seek medical advice; call 999 for severe symptoms or immediate danger.

A boiler may need power, but do not improvise a connection

Gas and oil boilers burn fuel, but their controls, ignition and circulation pumps may need electricity. The exact arrangement varies by boiler. A powered boiler may also depend on room controls, valves or other parts of the heating system. Check the manufacturer’s instructions for your model. Do not assume that a boiler will run from a particular battery because another boiler does.

For example, Vaillant says its boilers need electricity to ignite. That does not establish the requirements of another model. Use the instructions for the appliance in your home.

Never connect a power station to a boiler by modifying a plug, using a homemade lead or feeding the home through a socket. Do not connect any generator or battery inverter to fixed house wiring unless a suitable system has been designed and installed for that purpose. Do not make this connection yourself. This guide does not provide wiring instructions.

If you are considering backup power for a fixed appliance, ask the boiler maker and a qualified electrician about the exact model and installation. HSE says generator-powered electrical systems need suitable design, installation and maintenance by competent people. For professional work on a domestic gas appliance, use a competent Gas Safe registered engineer. Do not remove a boiler casing, change a gas connection or bypass a safety control. If your boiler shows a fault or repeatedly trips a circuit, leave it off and arrange qualified help.

Portable power is not a substitute for a safe heating plan. Keep warm with clothing and bedding, arrange a warmer place if the home becomes unsafe, and contact your network operator for outage updates. See the household power-cut plan and the winter outage checklist for the steps to take during a cut.

Make a separate plan for medical equipment

Do not decide that a power station is compatible with medical equipment from its plug, wattage or a general product chart. The equipment may have specific requirements for continuous supply, alarms, battery charging, grounding, humidity or accessories. Ask the device supplier and the clinician who supports the person. They can explain the approved backup plan for that exact device and how to respond if the supply fails.

Contact the electricity network operator and ask about the Priority Services Register. It may offer extra communication or support, but the details vary by operator and registration does not replace a clinical plan. Keep supplier and care-team numbers on paper. Read the guide for powered medical equipment during a cut. If someone becomes unwell, contact the clinician or NHS 111 for urgent advice, or 999 in an emergency.

Use the power station runtime tool only as an estimate based on the figures you enter. It cannot confirm compatibility or replace a manufacturer’s instructions. The household kit builder can help record contacts and other supplies, but do not put private clinical information in a shared list unless you choose to.

Compare products without assuming compatibility

When comparing stations, check continuous output, surge limits, battery capacity, permitted charging and the maker’s safety instructions. Consider where the station will be stored and how you will keep its manual and cables together. A larger capacity does not prove that the output suits a particular boiler, heater or medical device. Ask the equipment maker before purchase if the intended use matters to safety.

Our portable power station guide explains the published product information available for household planning. The Jackery and EcoFlow comparison links to Jackery and EcoFlow and compares stated features. Neither guide claims hands-on testing or certifies that a product will run a particular appliance. For a smaller device such as a phone, a power bank may be a simpler part of a communication plan, but check its output and cable against the phone maker’s advice.

If you do buy a station, read its manual before you need it. Use it only in the location and conditions the manufacturer permits. Keep it dry, ventilated and away from heat or combustible material as directed. Do not open its case, alter a battery pack or connect it to fixed wiring. Stop using it if it is damaged, unusually hot or behaving differently from its instructions.

Sources

Sources checked 31 October 2026.