Power outage checklist: what to run first
A battery-backup outage checklist connects essential loads, usable energy, food-temperature checks, and a recharge plan.
We turn the spec sheet into a household plan: check what connects, measure what it consumes, and decide how to keep essential loads supported if the outage lasts longer than expected.
Where our answer stops
This is an electrical calculation, not medical advice
BatteryRank has no medical expertise and claims none. We compute whether a battery can supply the power your device's own label states — that is an electrical question, not a medical one.
This checklist orders loads by energy cost, and a powered medical device is the one item on it we will not rank. We can say what a CPAP or a medication fridge draws and how long a given capacity sustains it; we cannot say how long you can safely go without either, or what to drop first when the battery will not cover both. If a device in your home is keeping someone well, plan it with the clinician and your utility's medical-needs register before you plan it with an energy budget.
Before the outage: check off your backup plan
A charged battery is only one part of a working setup.
You can check these items during this visit or print the page for your household. Checks are not saved after you reload.
Refrigeration: use temperature, not a switching timer
The refrigerator’s thermostat controls compressor cycling while power is available.
FDA guidance calls for appliance thermometers: keep the refrigerator at or below 40°F and the freezer at or below 0°F. During an outage, keep doors closed. An unopened, unpowered refrigerator keeps food cold for about 4 hours; a full freezer for about 48 hours, or 24 hours when half full. These approximate windows are not battery-runtime guarantees. FDA food-safety guidance · reviewed 2026-10-02.
We size refrigerator backup from its measured daily energy, including normal compressor cycles. Check the station’s automatic AC shutdown: a low-load timeout can turn the outlet off between cycles. If cooling is interrupted, use temperature readings and the FDA’s food-handling instructions to decide what to keep or discard. Prepare ice and a cooler before the battery runs out.
Build your household energy worksheet
Use your own consumption readings and planned operating time.
| Load | Reading to record | Energy calculation |
|---|---|---|
| Refrigerator or freezer | Metered daily energy; include normal cycling | Daily Wh × planned days |
| Router, modem, or light | Measured average watts and required operating hours | Average W × hours |
| Phones and USB devices | Energy per charge and planned charges | Wh per charge × charges; budget the USB path separately |
| Other essential AC appliances | Measured energy, continuous watts, and startup demand | Sum required Wh; check power limits separately |
85 %est.. Show source
estimated sourcebatteryrank.com ↗2026-10-02Add inverter idle energy separately when you have a sourced or measured idle draw, then allow for your starting charge, usable discharge range, and a reserve. If the manufacturer does not publish idle consumption, leave that as a recorded uncertainty rather than inventing a figure. A high continuous-output rating does not tell you how many days the battery lasts.
Enter your loads in the power-station sizing calculator, or use the refrigerator runtime calculator for the cooling load. Keep a reserve beyond the baseline estimate for your own outage plan.
Check the connection before checking the ranking
Electrical fit includes the connection, operating mode, and startup demand.
Confirm outlet voltage, continuous output, and the manufacturer’s startup or surge limit for each intended appliance. A resistive-load boosting mode is not a universal motor-start rating. For USB or DC equipment, check the required cable, voltage, and supported power profile.
Hardwired furnaces, pumps, and household circuits require a connection plan assessed by a qualified electrician. Never feed a backup source into a wall outlet. The Missouri Public Service Commission’s connection guidance explains backfeeding and transfer equipment · reviewed 2026-10-02. Follow the station manual and local installation requirements for your equipment.
Before relying on pass-through or UPS operation, check transfer time, supported loads, automatic shutdown, and whether AC remains enabled after a restart. Record the settings you verified so another household member can operate the setup.
During the outage: reassess before energy runs out
| Check | Action |
|---|---|
| Cooling | Keep doors closed, check appliance temperature, and prepare the cooling fallback. |
| Battery | Compare remaining energy with the loads and duration still required; drop optional loads first. |
| Recharge | Confirm the route is actually available; do not count forecast solar harvest as guaranteed energy. |
| Outage duration | Update the plan using utility information and household needs. |
Check solar input voltage and current compatibility before depending on a panel. Our solar recharge calculator compares estimated harvest with daily consumption; the panel pairing guide explains the connection checks.
Frequently asked questions
- What should I power first in an outage?
- Start with your household’s essential needs and an agreed plan for health-dependent equipment. Then budget refrigeration, communications, and lighting. We prioritize the consequence of losing a load, its required operating time, and its measured energy use rather than treating every household as identical.
- Should I manually cycle my fridge to save battery?
- We do not recommend a universal timed switching schedule. A refrigerator already uses its thermostat to cycle the compressor. Use measured daily energy to size the battery, monitor food temperature, and check that the station’s low-load shutdown does not interrupt refrigeration. Follow the linked FDA guidance if cooling is interrupted.
- How much battery capacity do I need for a three-day outage?
- Sum the delivered energy required by your actual devices over the planned duration. For AC loads, divide that energy by the published inverter-efficiency assumption rather than adding the same percentage to the load. Account separately for inverter idle consumption, starting charge, and a reserve. There is no universal three-day capacity figure.
- Can I power a furnace or other hardwired appliance?
- Check electrical compatibility and the connection method before comparing watts. A plug-in appliance and a hardwired circuit are different installations. Have a qualified electrician assess any household-circuit connection and the required transfer equipment; never feed backup power into a wall outlet.
- Does a UPS mode guarantee my equipment stays on?
- A UPS label does not establish compatibility. Compare the manufacturer’s transfer-time specification with your equipment’s tolerance, confirm the supported operating mode, and check low-load shutdown behavior. Verify the intended setup before you need it during an outage.