Part of Backup power applications · Also listed on UPS applications
What size portable power station do I need for a home outage?
Size Wh + continuous watts for fridge, lights, and internet—not marketing peak watts. This is a home storm / blackout plug-in guide—not a whole-home generator design.
Best for: homeowners picking a Jackery/EcoFlow-class station for selected outlets. Not ideal for: central HVAC, well pumps on multi-day fuel, or hardwired panel transfer without a generator.
Last reviewed: 2026-09-05 · As an Amazon Associate, CalcPanel earns from qualifying purchases.
Start with the outage information you have
Wh depends on which plugs you keep alive and for how many hours. Pick the path that matches what you can verify, then finish the workflow before you buy.
I know device watts and hours I need a Wh size chart first I already know my station Wh target
PC/NAS blinks still need a UPS—stations are usually manual plug-over. Compare paths in portable power vs UPS.
Recommended Wh size for home outage loads
Quick answer: Wh ≈ (W × hours ÷ η) × (1 + buffer). Screen with ~20% buffer and η ≈ 0.85–0.9. Common buys: 500 Wh for phones/router; 1000 Wh for lights + partial fridge; 2000 Wh for a fuller fridge night.
| Load set | Approx. watts | Target hours | Buy this Wh class |
|---|---|---|---|
| Modem + phone charge | 20–40 W | 8–12 h | ~300–500 Wh |
| Router + LED lights + laptop | 80–120 W | 6–8 h | ~1000 Wh |
| Fridge (avg) + lights + router | 150–250 W | 6–8 h | ~1500–2000 Wh |
| CPAP / medical (check OEM) | Device-specific | Policy hours | Size from measured W; prefer pure sine |
Which home outage setup should I buy?
Match hardware to how long storms last and whether you need panel circuits.
| Deployment | Typical path | Wh / kW cue | Notes |
|---|---|---|---|
| Short blinks + PC/NAS | UPS first | VA class, not Wh | See portable power vs UPS |
| Overnight fridge + internet | Portable power station | 1000–2000 Wh | Confirm compressor surge |
| Multi-day / HVAC / well | Generator + transfer | kW continuous | Station vs generator · Transfer Switch Size |
| Apartment / balcony limits | Station only | 500–1000 Wh | Fuel gens often restricted |
Home outage power station buying checklist
- Measured watts for each must-run plug (kill-a-watt or nameplate)
- Wh screen with buffer and inverter efficiency
- Continuous watts ≥ steady load (ignore marketing peaks)
- Surge watts ≥ fridge/compressor start
- Pure sine when motors or active-PFC PSUs require it
- UPS kept on PC/NAS for blinks while you plug loads
- Recharge plan (wall / car / solar) after the outage
Home outage Wh sizing workflow
Four steps from load list to purchase tier. UPS runtime presets are for IT bridge—not the first step for fridge Wh.
-
List plug-in watts
Fridge average, lights, modem/router, chargers—exclude central HVAC unless you truly expect to run it.
UPS Load Calculator (device roll-up) -
Size Wh and continuous watts
Enter W, hours, buffer, and surge into the station calculator.
Portable Power Station Size Calculator -
Protect IT with a UPS
Keep PCs/NAS on UPS for blinks; stations are manual plug-over.
UPS Runtime Calculator -
Escalate to generator if needed
Multi-day or panel circuits → generator kVA + transfer switch—not a larger suitcase alone.
Generator Size Calculator
Typical home outage device power
Use average running watts for Wh; enter compressor start separately as surge.
| Device | Typical watts | Notes |
|---|---|---|
| Modem / router | 10–20 W | Often 24/7 critical |
| LED lights (room) | 10–40 W | Sum fixtures you will keep on |
| Laptop | 45–65 W | Charging peaks higher briefly |
| Fridge (average) | 100–200 W | Duty cycle; surge much higher |
| Phone charge | 10–20 W | Intermittent |
| CPAP | Device OEM | Prefer pure sine; size measured W |
Example home outage sizes
Example 1 — internet only: 30 W modem/router × 10 h × 1.2 ≈ 360 Wh → shop 500 Wh class.
Example 2 — lights + laptop: 100 W × 8 h × 1.2 ≈ 960 Wh → shop 1000 Wh class.
Example 3 — fridge night: 180 W average × 8 h × 1.2 ≈ 1728 Wh → shop 2000 Wh class; confirm surge ≥ compressor start.
Recommended backup hours for home plug-in loads
- 4–6 hours: Evening storm until utility restores—router + lights often fit a 500–1000 Wh class.
- 8–12 hours: Overnight fridge + internet—commonly screen 1500–2000 Wh with surge checks.
- 24+ hours / multi-day: Fuel generator + transfer path usually beats stacking suitcase stations for panel circuits or HVAC.
- IT blinks only: Keep UPS minutes on PCs/NAS; do not replace that with a station alone.
Key variables that change the answer
- Average vs peak fridge watts (duty cycle matters)
- Inverter continuous and surge ratings
- Depth of discharge / usable Wh vs nameplate Wh
- Whether HVAC or well pump is in scope (usually generator territory)
Common home outage sizing mistakes
- Buying on peak watts instead of continuous watts + Wh
- Expecting a 500 Wh pack to run a fridge all night
- Dropping the UPS on NAS/PC because you bought a station
- Trying to run central A/C on a suitcase station
- Skipping surge checks for compressors
Assumptions and disclaimer
Screens on this page are estimates for planning only. Real runtime depends on inverter efficiency, temperature, battery chemistry, and load duty cycle. Hire a licensed electrician for panel transfer work. Amazon links elsewhere on CalcPanel may be sponsored; this page focuses on sizing. Not a substitute for OEM datasheets or AHJ requirements.
Related guides
- Portable power station vs UPS — when Wh beats VA
- Portable power station vs generator — fuel vs battery
- ATS transfer time & sizing — generator transfer path
FAQ
What size portable power station do I need for a home outage?
Estimate Wh ≈ load watts × hours × 1.2 ÷ η. Common: 500 Wh for router; 1000–2000 Wh for fridge nights.
Will a 1000W portable power station run a refrigerator?
Often yes if continuous/surge and Wh allow—many homes still prefer 1500–2000 Wh for a full night with lights.
What can a 2000W portable power station run?
Fridge, lights, chargers, router within continuous watts—not whole-home HVAC.
Is a portable power station better than a UPS for outages?
For hours of plug-in loads, yes. For IT blinks, keep a UPS.
Can a portable power station power a whole house?
Usually selected outlets only. Panel circuits need a generator + listed transfer method.
How do I calculate Wh for a power station?
Wh = (W × hours ÷ η) × (1 + buffer). Use the Power Station Size Calculator.
Do I need pure sine wave for a fridge?
Many compressors prefer pure sine—follow OEM guidance.
Portable power station vs generator for home backup?
Related backup & UPS scenarios
- UPS for home office — desk + router continuity (minutes-scale IT, not fridge Wh)
- Portable power station vs generator — when fuel energy beats suitcase Wh
- Portable power station vs UPS — Wh vs VA / transfer time
- Generator size calculator — multi-day / panel-circuit path
Also see portable power for camping, portable power for jobsite, and portable power for RV sizing guides.