How to Prioritize Appliances During a Power Outage
Start with the consequences of losing power, then calculate the load. Medical equipment needs its own provider-approved backup plan. After that, protect against immediate risks such as dangerous indoor temperatures or flooding, keep essential communications and lighting available, and plan refrigeration. Leave discretionary appliances off until those needs are covered.
There is no single appliance order that fits every household. A sump pump during flooding may outrank a freezer; cooling during extreme heat may be a health need rather than a comfort load. Use the worksheet below to make those decisions before the power goes out. This is a source-based planning guide; its electrical examples are assumptions, not measurements of your appliances.
1. Make an appliance priority list for your household
| Priority | Examples | Decision to record |
|---|---|---|
| Health and immediate safety | Prescribed powered medical equipment; heating or cooling when loss creates a health risk | Approved backup, safe destination, and when to seek help |
| Time-sensitive protection | Sump or well pump; refrigerator or freezer | What happens if it stops, required runtime, and an alternative |
| Communication and essential light | Phone, needed network equipment, LED lights | Hours needed; whether a charged power bank can cover it |
| Deferrable use | TV, laundry, discretionary cooking and other convenience loads | Keep off unless the remaining power and energy budget allows it |
For each item, write its exact model, who depends on it, and the longest interruption your plan permits. Include an alternative: bottled water, a cooler, a charged phone, or another safe place to stay. If a hazard makes the home unsafe, additional battery capacity does not replace evacuation instructions.
Medical equipment: FDA advises checking the device instructions or contacting its distributor/manufacturer about battery or generator use. Confirm permitted power sources and backup arrangements with your care provider. A watt rating alone cannot establish compatibility or uninterrupted operation. If you depend on the device to stay alive and its operation is threatened, seek emergency help. Our oxygen concentrator backup checklist explains the questions to ask; it is not a universal battery recommendation.
2. Record running watts, startup needs, and energy use
Two different limits decide whether your backup can do the job. Watts (W) describe power at a moment; watt-hours (Wh) describe energy used over time. As EIA explains, 1 kWh equals 1,000 Wh. A 20 W load operating for five hours uses 100 Wh. A battery advertised as 1,000 Wh is not necessarily a 1,000 W power source.
- Check the appliance manual and label for voltage, frequency, running power, and startup requirements. Motors and compressors can demand extra power when starting.
- For a suitable plug-in appliance, use an appropriately rated energy meter according to its instructions. Record energy over the intended period as well as running power. A basic meter may miss a brief startup peak.
- Do not treat a refrigerator’s label or one running-watt reading as its average consumption. Compressor cycling, defrost, ambient temperature, and door openings affect energy use.
- Ask a qualified electrician about hardwired equipment, pumps, heating systems, and household circuits. Do not remove panel covers or improvise wiring to measure them.
Copy this worksheet once per appliance: model; priority; running W; documented startup requirement; hours needed; estimated or measured Wh; permitted connection; fallback. Mark unknown values as unknown rather than substituting a generic appliance chart.
3. Build a watt-hour budget for the outage
For a steady load, energy (Wh) = power (W) × hours. For a cycling appliance, use its measured energy over a representative period when available. Add the energy required by every planned load. Then compare it with energy the backup can deliver through the outputs you will use, allowing for conversion losses, inverter idle use, battery reserve, and actual operating conditions.
Illustrative eight-hour plan: every figure below is an assumed input, not a product specification or a tested refrigerator result. Replace it with your own data.
| Load | Assumption | Energy budget |
|---|---|---|
| Refrigerator | Assume 600 Wh consumed across the eight-hour period | 600 Wh |
| Router and modem together | 15 W for eight hours | 120 Wh |
| One LED light | 8 W for six hours | 48 Wh |
| Phone charging | 20 W input for one hour | 20 Wh |
| Total | Different loads run for different periods | 788 Wh |
If a 1,000 Wh battery delivered an assumed 85% of nominal capacity to these loads, that would be 850 Wh. The 788 Wh plan leaves only 62 Wh before any additional demand. That is a narrow margin, not a recommendation or an eight-hour guarantee. Separately check inverter power, refrigerator startup, output compatibility, and the battery’s cutoff and reserve settings.
For a genuinely steady 100 W load, the same assumed 850 Wh would suggest 8.5 hours before further allowances. This simple division is less useful for loads that cycle or change settings. See our Explorer 1000 v2 versus DELTA 2 comparison for the difference between rated capacity, output power, and estimated runtime.
4. Check simultaneous power and the connection
Add the running watts of devices that may operate together. Check that total against the source’s continuous output limit, and check startup demands against its documented surge capability and duration. Also check outlet and circuit limits. Passing the energy calculation does not prove the source can start a motor.
Stagger discretionary loads when the equipment instructions permit it. Avoid repeated compressor restarts; follow the appliance’s required restart delay instead of a universal timing rule. Household generator connections need suitable transfer equipment selected and installed by a qualified electrician. Follow the instructions for that installation rather than a generic breaker-switching sequence.
Generator safety: CPSC says to use portable generators outdoors, at least 20 feet from homes, with exhaust directed away. Keep them away from doors, windows, and vents; never run them in a home or garage, even with doors open. Use working CO alarms with battery backup. The CPSC generator safety resources also cover electrical hazards: never power home wiring by plugging a generator into a wall outlet. Follow the generator manual for dry operation, cords, grounding, and refueling.
5. Monitor refrigeration and changing conditions
Keep refrigerator and freezer doors closed and use appliance thermometers. FDA estimates about four hours for an unopened refrigerator, roughly 48 hours for a full freezer, and 24 hours for a half-full freezer. These are approximate cold-holding periods, not electrical runtimes or guarantees that food remains safe. Follow temperature-based food-safety guidance; a successful restart does not make spoiled food safe. Our refrigerator outage checklist covers preparation and food decisions.
Recheck your priority list as the outage develops. Battery charge, indoor temperature, flood risk, and the needs of people in the home can change. Record actual consumption during a safe practice run so the next plan rests on your equipment rather than assumed watts. Use the manufacturer’s maintenance schedule for batteries, generators, and alarms.
Your one-page outage checklist
- List essential devices, exact models, contacts, and fallbacks.
- Record running power, startup needs, runtime, and energy for each load.
- Check continuous output, surge, connections, and the total energy budget.
- Write the permitted operating sequence for your specific equipment.
- Keep the plan, manuals, a light, and emergency contacts accessible offline.
- Review it after equipment changes and after a safe practice run.
41 comments
Long winded but hopefully useful:
I run community drills at our HOA and we used this guide as the base. What worked:
– Print the priority list and stick it in common areas.
– Assign two homeowners per ‘critical load’ so someone’s always trained.
– Schedule a generator test day and invite a local electrician to supervise.
What didn’t: overly technical jargon — make a ‘for non-techs’ side-sheet. Otherwise great resource.
Love the HOA idea. Our block did a shared generator demo and it’s saved a few panicked neighbors.
Fantastic feedback, Miguel. Community drills are a great use of the guide. We’ll work on a ‘for non-techs’ simplified sheet and a spare-parts quick checklist.
This guide is solid. Minor nitpick: maybe include smartphone app recs for outage maps and generator monitoring. Also: typos in Step 1 header (found one) — otherwise top notch!
Added — we found and fixed the header typo. Thanks everyone for the app recs; we’ll curate a short list in the next update.
I use an app that alerts the neighborhood about outages — super helpful. Name is ‘Outage Watch’ (not advertising, just a tip).
I can second app recs. Some inverters have apps that show load consumption in real time — extremely handy during switching.
Thanks, Olga — appreciate the proofreading eye. We’ll add app recommendations and fix any typos. If you can point out the exact line with the header typo, that’ll speed edits.
Typos are human. Appreciate the guide anyway 🙏
Funny story: I tried prioritizing by ‘what my partner will notice first’ and ended up running a lamp and the TV for 3 hours while the fridge slowly melted 😂. Guide helped me normalize logic over theatrics.
Been there. My partner prioritizes ambiance; I prioritize cold food. We compromise on LED candles and the fridge.
Ha — energy theater is real. Glad the guide nudged you toward practical priorities.
Treat it like triage: vital equipment first, comfort later. And hide the TV remote if necessary 😉
Two-line rant: I wish there were more on legal/safety rules for DIY transfer switches. I understand the liability, but a clearer ‘do this vs call a pro’ section would help newbies.
Valid point. We’ll add a clearer breakdown of tasks okay for DIY vs those requiring a licensed electrician, plus safety red flags that should always trigger a call to a pro.
Short and sweet — the ranking matrix in Step 2 helped me decide between running the freezer vs. the electric heater (spoiler: freezer won). Thanks!
Great guide — super practical. Mapped my breaker box last night using the Step 1 tips and realized half my kitchen is on the same circuit as the garage. Whoops.
Question: for Step 3, how do you recommend estimating inverter/load limits if I only have the generator manual (no watt-meter)?
I did this and used the microwave’s plate rotation sound as a rough proxy for load… jk 😂 but really the manual + fridge + a few lights usually tells the story. If in doubt, prioritize fridge + phone chargers first.
Also consider starting currents — fridges draw more at startup. So even if running watts fit, the surge could trip a small gen. Stagger start times per Step 4.
This is oddly calming. The ‘Ready, Calm, and Prepared’ section really sold me on doing a family drill. We did one tonight and my partner forgot how to flip the breaker box 😂. Note to self: don’t assume, teach.
I taped a printed diagram to the inside of my electrical closet door. Saved time when the storm hit.
Pro tip: keep a laminated one-page checklist near the breaker box. It helped my spouse not panic during our last outage.
Exactly — drills expose assumptions. Make them short and low pressure so people don’t dread them.
I appreciate the maintenance section — lots of people forget generators need yearly checkups. My only gripe: the parts list could include common spare items (fuel stabilizer, filters, fuses) in one quick checklist.
Two thoughts: first, I think the guide underplays surge loads (generators often can’t handle multiple motors starting together). Second — for Step 5 — don’t forget to update phone contacts and add your utility outage number to favorites.
Small but important stuff.
Agreed on the surge loads. I once tried to start both AC units on my portable gen and it instantly went into overload. Learned my lesson.
Good points. We mention startup surges in Step 3 but will make that clearer. And yes, putting the utility outage line in favorites + an offline copy of emergency contacts helps a lot.
Me: reads guide. Also me: totally overthinks whether the sump pump should be a top priority vs. the refrigerator.
Love the decision flow in Step 2 — it made me rank the sump pump higher since basement flooding > cold milk any day. Practical advice, no fluff.
Flooding > cold milk indeed. Also consider battery backups for the pump if flooding is a real risk where you live.
Good call. Safety/damage prevention appliances (sump pump, medical equipment) usually outrank convenience loads. Glad the flow helped.
Quick question: for a small solar setup (no battery, grid-tied with generator backup), any tips in Step 4 about integrating generators with inverters? I’m not sure about load sharing and safety.
If your inverter is grid-tied, you must follow the inverter’s manufacturer instructions and local code — many require anti-islanding and specific transfer switches. For generator integration, a transfer switch that isolates the house from the grid is essential. Consult an installer for wiring and inverter-generator compatibility.
Loved the section on switching and load management. I set up a simple labeled transfer panel and practiced switching loads once.
Big long comment coming because I want to be useful to others:
1) Label everything clearly — I used colored tape.
2) Practice switching with someone else nearby until it’s second nature.
3) For families: make a one-page cheat sheet (who flips what and when).
4) Test your plan quarterly — it’s amazing how things change.
Also, anyone else find that kids think outage time is party time? 😅
My kids love ‘power drills’ — the flashlight becomes a magic wand. Good tip on the cheat sheet, Sarah. I pinned ours on the fridge.
Exactly — practice is the overlooked part. Labels and a cheat sheet are lifesavers during a stressful outage. And yes, involving kids in low-risk tasks (like handing you a flashlight) helps keep them calm.
Labeling saved me when my neighbor asked to plug in a medical device. Clear labels = no guessing = fewer mistakes.
Helpful and realistic guide. One constructive note: a printable template for the ‘map your home’ step would be awesome. Hand-drawing is fine but a fillable PDF would save time.
Yes please! A template would be very handy for community workshops.
Thanks — that’s a great suggestion. We’ll work on adding a downloadable fillable template for the mapping and the appliance ranking table.
If anyone wants, I can email my template — PM me. Saved me during a blackout drill at work.
I made my own in Google Drawings and shared it with my neighborhood group. If the author posts one, I’ll replace mine 😄