The generator question answers itself
Portable generators are not usable in an apartment, and it is worth being blunt about why rather than treating it as a rule to work around.
- Carbon monoxide. A balcony is not outdoors in the sense the safety guidance means. Exhaust rises, enters open windows above, and collects on covered balconies. Ready.gov requires twenty feet from windows, doors and attached garages, which no balcony provides.
- Fuel storage. Gasoline in an apartment building is prohibited by most fire codes and by most leases, and for good reason.
- Noise. A machine at 52 dB(A) in a building is not the same as one in a yard.
- Your lease. Almost all of them prohibit it explicitly.
So this is a battery question, and that is genuinely good news — the smaller answer is also the simpler, quieter and safer one.
What you can and cannot reach
The defining feature of apartment backup is that many of the loads people worry about are not yours to power.
| Load | Yours? | Notes |
|---|
| Refrigerator | Yes | The main reason to own a battery at all |
|---|
| Router, modem, phones, laptop | Yes | Small and cheap to cover |
|---|
| Lighting | Yes | Lanterns first, battery second |
|---|
| Central heating and cooling | Usually no | Building system — nothing you can do |
|---|
| Elevators | No | Building system, often on its own backup |
|---|
| Water pressure above a few floors | No | Booster pumps are building systems |
|---|
| Corridor and stairwell lighting | No | Emergency lighting is code-required but time-limited |
|---|
Which of these your building keeps running on its own backup varies enormously. It is worth asking the building manager directly rather than assuming — the answer changes what you should prepare for.
The three failures unique to a tall building
These do not appear in general outage guidance and they are the ones that catch apartment residents out.
1. Water stops above a certain floor. Most tall buildings use booster pumps, and those are electric. Lower floors may keep gravity-fed pressure while upper floors lose it entirely, including the ability to flush. Store drinking water, and fill the bath when an outage is forecast.
2. The elevator is gone, and the stairwell is dark. Emergency lighting is code-required but designed to cover evacuation, not a two-day outage. If you are high up, or anyone in the household has mobility difficulty, that is a planning problem rather than an inconvenience. Keep a headlamp per person by the door.
3. Secure entry may fail either way. Some door systems fail unlocked, some fail locked, and some leave you unable to get back into the building. Find out which yours does before you need to know.
Sizing it, small
An apartment load list is short, which makes the arithmetic easy:
- Refrigerator: ~150W average, 500-1,000W to start
- Router and modem: ~20W
- Laptop and phones: ~80W
- LED lighting: ~40W
Running total around 290W, peak around 1,100W when the fridge starts. So an 1,800W inverter is comfortable and a kilowatt-hour covers most of a day — or well over a day if you run the fridge in blocks rather than continuously, which a closed fridge tolerates easily.
The full sizing method works through the arithmetic properly.
Charging it, which is the real constraint
A battery with no recharge path is a fixed number of hours, and in an apartment your options are narrower than in a house.
- The grid, when it flickers back. Which is why fast AC recharge is worth paying for here specifically.
- A balcony panel, if you have usable aspect. Folding only — nothing gets mounted.
- Your car, if you have one and can reach it. Slow, but it works.
- Somewhere else. An office, a relative, a café. Carry the unit, not the problem.
The practical consequence: buy more capacity than the arithmetic demands, because your ability to refill mid-outage is worse than a house-dweller's.
Where to keep it
- Indoors, at room temperature. No garage exists to get this wrong, which is one advantage apartments have.
- Not on a balcony. Most units carry no weather rating, and heat and cold both age cells.
- Somewhere reachable in the dark without moving three other things.
- Charged before the season, topped up twice a year. The storage routine is ten minutes.
What to buy if space is genuinely tight
Not everyone has a cupboard. In descending order of value:
- A small UPS behind the router. Invisible, and it removes the reboot from every brief outage.
- Two good power banks. 20,000 mAh each keeps phones alive for days and fits in a drawer.
- Lanterns and headlamps. Small, cheap, and the thing you actually use first.
- A weather radio. Building announcements do not exist; you find out what is happening yourself.
That set costs a fraction of a power station, fits in one drawer, and covers the short outages that make up the large majority of what apartments actually experience.
