How Long Will It Run

Disclaimer

How Long Will It Run is a calculator. It estimates how long batteries run things, and lists kit worth having for a power cut. Please read this before relying on anything here.

Estimates, not guarantees

Every runtime, charge count and cost on this site is a calculation from published specifications and typical appliance draw, not a measurement of your equipment. Real results depend on your appliance, your battery, its age, the temperature and how you use them, and can be much shorter. Test any setup you intend to rely on before you need it.

Not medical advice

Pages that mention medical equipment (CPAP, oxygen concentrators, nebulisers, medication fridges) or medicines such as insulin give general information about power and batteries only. They are not medical advice, were not written by a clinician, and do not replace the instructions of your doctor, pharmacist, clinical team or equipment supplier, which always take priority. Never change how you use medical equipment or medicine because of anything on this site. If life or health depends on powered equipment, follow the official guidance and have the backup your supplier provides.

Official sources to follow instead:

In an emergency call 999 in the UK or 911 in the US.

Safety

Generators, camping stoves, barbecues and fuel-burning heaters used indoors or near openings can cause fatal carbon monoxide poisoning. Follow the manufacturer's instructions for any product, and official safety advice such as that from the CDC and your local fire and rescue service. Stay away from fallen power lines and report them (105 in Great Britain, your utility in the US).

Products and links

Kit lists name types of product and what to look for; nothing has been tested hands-on, and no particular product is endorsed. Amazon and other retailer links are affiliate links; the retailer, not this site, is responsible for the products, their safety, prices and stock. Links to government and other outside sites are provided for convenience, and this site is not responsible for their content.

Liability

Information is provided in good faith and as is, without warranty of any kind. To the fullest extent permitted by law, Epona Solutions Ltd accepts no liability for any loss, damage or injury arising from the use of, or reliance on, anything on this site. Nothing here excludes or limits liability that cannot be excluded or limited by law.

Spotted an error? Email [email protected] and it will be corrected.