The Atlantic hurricane season runs June 1 through November 30, but the danger is not spread evenly across it. NOAA’s climatology puts the statistical peak on September 10, with most activity between mid-August and mid-October, and an average season producing 14 named storms and 7 hurricanes. If you are reading this in July, you are on time. The point of this guide is to make sure the version of you standing in a stripped-bare store aisle two days before landfall never exists.
What hurricane outages actually look like
Ordinary outages are measured in hours. Hurricane outages are measured in days, and the public data makes the gap concrete.
EIA reports that U.S. electricity customers averaged 11 hours of interruptions in 2024, nearly twice the average of the decade before, and that hurricanes Beryl, Helene, and Milton accounted for 80% of those hours. Helene alone cut power to 5.9 million customers across ten states; Beryl took out 2.6 million in Texas; Milton, 3.4 million in Florida.
Averages also hide the tail that matters for planning. After Beryl hit the Houston area in July 2024, CenterPoint Energy’s after-action report shows about 1 million of 2.26 million affected customers restored within the first 55 hours, roughly 98% restored after nine days, and the final customers reconnected only about 11 days after landfall. Most people get power back within two or three days. Someone is always the tail, and you cannot know in advance whether that is your street.
A defensible planning target for a hurricane-prone household: three days of essential power, with a recharge path (car or solar) in case you land in the tail.
The priority list: what actually needs power
Not everything in your house is worth battery capacity. Ranked by importance per watt-hour:
- Medical devices. If anyone in the household depends on powered medical equipment, it outranks everything else, and it is the one item where generic advice is not good enough. Verify battery requirements with the device manufacturer and your doctor before buying anything. For the most common case, our CPAP backup power picks work the full-night math, humidifier caveats included.
- Communications. Phones, plus your modem and router if the lines stay up. A router and modem together draw around 10W, which makes internet one of the cheapest things you can protect. Our router and modem backup guide covers the details.
- Lights. A few LED lamps at 5 to 10W each turn a grim week into a manageable one for almost no capacity.
- Fans. Post-hurricane heat is a genuine hazard, and a 40W box fan is the realistic cooling tool. Air conditioning on battery power is not realistic for most households, and any plan that assumes it will fail.
- The fridge. Important, but expensive; a full-size fridge needs roughly 3,800Wh for a single day. It deserves its own decision and its own budget line, which is exactly what our fridge backup guide walks through.
Everything with a heating element (kettles, toasters, space heaters, hair dryers) stays off the list. Those loads empty batteries in minutes.
Sizing before the storm, not during the rush
Sizing is a 20-minute job when the sky is clear and an impossible one when the cone is on the news. The math below uses this site’s standard assumptions, which we publish rather than hide: 85% inverter efficiency and a 10% reserve left in the battery. A 1,000Wh station therefore delivers about 765Wh of usable energy.
| Load | Typical draw | Runtime on 1,000Wh (~765Wh usable) |
|---|---|---|
| Modem + router | ~10W | ~76 hours |
| LED lamp | ~8W | ~95 hours |
| Box fan | ~40W | ~19 hours |
| Mini fridge | ~45W duty-cycle average | ~17 hours |
| Full-size fridge | ~120W duty-cycle average | ~6 hours |
Two honest readings of that table. First, a mid-size station covers communications, lights, and a fan for days, which is why the essentials baseline is affordable. Second, the fridge consumes capacity roughly ten times faster than the internet does, which is why it is the fork in the road: skipping it keeps you in the mid classes, while backing it properly pushes you toward 2,000Wh and up.
Run your own device list through the Battery Runtime Calculator, or start from target hours with the Power Station Sizing Calculator. To size the whole table at once, the Multi-Device Load Builder totals every device — fridge duty cycle applied — and that link opens it pre-loaded with a typical essentials-plus-mini-fridge list you can edit. Then hold the budget line using our guide to choosing a station without overspending.
Why buying during a watch is the worst time
A hurricane watch means damaging winds are possible within about 48 hours; a warning means they are expected within about 36, per the National Weather Service. Measure that window against what buying backup power actually requires:
- Shipping. Standard delivery cannot be trusted to beat 48 hours, and carriers suspend service as a storm approaches. Gear that arrives after landfall is money spent for nothing.
- Inventory. Local stores sell out of exactly this category first, so you buy whatever is left rather than what fits your loads.
- Charging and testing. New stations ship partially charged, and the time to charge fully and run a real test under load is time a watch does not give you.
- Judgment. A power station is a multi-year purchase. Deciding under deadline pressure, from whatever is in stock, is how people overspend on the wrong unit.
None of this is a scare tactic; it is just the calendar. The identical station, bought in July, costs normal money and arrives with time to test.
Safety basics: the two rules that matter
Never run a fuel-burning generator indoors. Not in a garage, carport, basement, or covered porch. Generator exhaust carbon monoxide is a leading killer in the days after hurricanes, and opening windows does not make an indoor generator safe. CDC guidance is outdoors only, more than 20 feet from windows, doors, and vents, with a battery-powered CO detector inside the house. Battery power stations are the indoor-safe alternative: no engine, no exhaust, no CO.
Keep the fridge closed and know the food-safety clock. Per FoodSafety.gov, an unopened refrigerator holds safe temperatures for about 4 hours, a full freezer for about 48 hours, and a half-full freezer for about 24. Frozen water bottles moved into the fridge stretch those windows further.
The countdown: once a storm is named
Preparation compresses badly, so work it in stages tied to the forecast rather than in one panic burst.
Storm named, cone published (often 3 to 5+ days out). Charge every battery you own to full: station, power banks, laptops, spare phone batteries. Test the station under a real load for ten minutes. Start freezing water bottles. Restock only small gaps (batteries, shelf-stable food); this is a top-off, not a shopping spree, because you prepared in July.
Watch issued (~48 hours). Fuel the car; it is both your evacuation vehicle and a recharge source for the station. Fill prescriptions. Set the fridge and freezer to their coldest settings and consolidate the freezer so it counts as full.
Warning issued (~36 hours). Finish every charge. Write down critical phone numbers on paper. Move the station and lights to the room where you will ride out the storm. Decide now, calmly, what the fridge plan is: battery bursts, ice and cooler, or accept the loss.
Final hours. Top off phones and set them to low-power mode. Move frozen water bottles into the fridge compartment. Stop opening the fridge.
During and after. Spend battery on the priority list in order, run the fridge in bursts if you chose to back it, and recharge from the car or solar during daylight. If neighbors are running generators, keep your CO detector on; post-storm CO drifts into houses that never ran a generator at all.
Next steps
- Put your actual devices into the Battery Runtime Calculator and see what three days really requires.
- Basement on a sump pump? Our sump pump battery backup picks cover the surge math and where a battery honestly stops being the answer.
- Compare capacity classes and prices in the comparison hub while there is no storm on the map.
- Build the rest of the plan with the emergency power checklist; most of it applies to houses as well as apartments.