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If you’ve started shopping for backup power, you’ve probably noticed three very different options. Portable power stations are suitcase-sized batteries you plug things into. Whole-home battery systems are wall-mounted batteries an electrician wires into your panel, sometimes paired with rooftop solar. Generators, portable or permanently installed standby units, burn gasoline, propane or natural gas. Prices span from a few hundred dollars to well into five figures.
The right answer depends on one question more than any other: what do you need to keep running, and for how long? This guide breaks down the real differences so you can match the system to your outage risk instead of overbuying (or underbuying).
The three tiers of home backup
It helps to think in three tiers rather than two:
- Portable power stations (~0.5–2 kWh). Plug-and-play. Run a fridge, lights, Wi-Fi, phones, a CPAP. No installation.
- Expandable “home” power stations (~3–25+ kWh). Still technically portable (on wheels), but they can connect to a transfer switch or smart panel and often offer 240 V. Examples: Anker SOLIX F3800, EcoFlow DELTA Pro, BLUETTI AC300/AC500 systems.
- Permanently installed whole-home batteries (~10–15 kWh per unit, stackable). Wall-mounted, wired into your main panel by a licensed installer, often tied to solar. Examples: Tesla Powerwall 3, Enphase IQ Battery, FranklinWH.
Tier 2 is the one most people don’t know exists, and it’s often the sweet spot.
Side-by-side comparison
Specs are from the manufacturers’ product pages. Always confirm on the current page, since specs and bundles change.
| Portable (e.g. Anker SOLIX C1000) | Expandable home station (e.g. Anker SOLIX F3800) | Installed battery (e.g. Tesla Powerwall 3) | |
|---|---|---|---|
| Capacity | 1,056 Wh | 3,840 Wh, expandable to 26.9 kWh with expansion batteries | 13.5 kWh per unit |
| Continuous output | 1,800 W (2,400 W surge) | 6,000 W (9,000 W surge) | 11.5 kW on-grid and in backup (185 LRA motor start) |
| Voltage | 120 V | 120 V and 120/240 V split-phase | Whole panel (120/240 V) |
| Installation | None | Optional transfer switch / home power panel (electrician) | Required, licensed installer, permits |
| Switchover | Manual plug-in, or UPS mode for individual devices (<20 ms) | Automatic with home panel; <20 ms UPS on three 120 V outlets | Automatic, whole home or backed-up circuits |
| Moves with you | Yes | Yes (heavy, on wheels) | No |
| Federal tax credit | Generally no | Usually no for portable gear (check with a tax pro) | Possibly. Rules for battery storage changed in 2025, so confirm current eligibility |
[AFFILIATE LINK: Anker SOLIX C1000] · [AFFILIATE LINK: Anker SOLIX F3800] · [AFFILIATE LINK: BLUETTI AC300 + B300 system] · [AFFILIATE LINK: EcoFlow DELTA Pro]
We don’t list prices here because they change week to week. Check current prices at the links, and get at least three installer quotes for an installed system.
What each tier can realistically run
Here’s the honest version, using typical appliance numbers:
| Load | Typical running watts | Portable 1 kWh | Expandable 4 kWh | Installed 13.5 kWh |
|---|---|---|---|---|
| Refrigerator (avg) | 60–90 W | ✅ ~10–15 h | ✅ ~1.5–2 days | ✅ several days |
| Lights, Wi-Fi, phones | 50–100 W | ✅ | ✅ | ✅ |
| CPAP (no humidifier) | 30–60 W | ✅ 1–2 nights | ✅ a week+ | ✅ |
| Well pump (240 V, ¾–1 HP) | 1,000–1,500 W running, much higher surge | ❌ (120 V only) | ✅ with 240 V + transfer switch | ✅ |
| Window AC (8,000 BTU) | 600–800 W | ⚠️ ~1–1.5 h | ✅ ~5 h | ✅ |
| Central AC (3-ton) | 3,000–4,000 W | ❌ | ⚠️ short bursts | ⚠️ with soft-start, limited hours |
| Electric range / dryer / water heater | 3,000–5,500 W | ❌ | ⚠️ not practical | ⚠️ drains fast |
The pattern is clear. Portable stations cover essentials. Whole-home systems cover comfort. Big resistive loads (heat, hot water, cooking) and central AC are what push you up a tier, and they drain any battery quickly.
Where generators fit
Generators are the third option, and for long outages they are still the most common one. They make power for as long as you have fuel, which is their big advantage over any battery.
| Battery (portable or whole-home) | Portable generator | Standby generator | |
|---|---|---|---|
| Runtime | Fixed by stored kWh, unless recharged by solar or a generator | As long as you refuel (gas or propane) | Days to weeks on natural gas or a large propane tank |
| Indoor use | Yes, no exhaust | Never. Outdoors only, far from doors, windows and vents | Installed outside by a pro |
| Noise | Silent (fans only) | Loud | Moderate to loud |
| Maintenance | Almost none; keep it charged | Oil changes, fuel stabilizer, regular test runs | Annual service; runs automatic self-tests |
| Startup | Instant, or automatic UPS / home panel | Manual pull or push start, cords or inlet + transfer switch | Automatic transfer switch, seconds after an outage |
| Big loads (central AC, well pump) | Only larger 240 V systems | Larger models with 240 V output | Yes, if sized for them |
| Fuel in a disaster | Recharges from the grid or solar | Gas stations may be closed or without power | Natural gas usually keeps flowing |
The safety difference is the big one. The CDC warns that generators must never run inside a home, garage, basement or crawlspace, even with doors open, and should stay at least 20 feet from windows and doors because of carbon monoxide. A battery has no exhaust, so it can sit next to your bed or fridge.
Hybrid setups are common. Many people pair a power station with a small inverter generator: the battery runs quietly overnight and the generator recharges it for an hour or two during the day. That uses far less fuel than running a generator around the clock.
Whole-home battery backup without solar
You don’t need rooftop solar to get battery backup. Without solar:
- Installed batteries charge from the grid and sit ready for an outage. You lose the daily solar savings and any solar-tied incentives, but the backup still works. Check whether your installer and utility allow battery-only installs.
- Expandable power stations charge from a wall outlet and, with a transfer switch or home panel, back up selected circuits. This is the lower-cost route to “whole-home-ish” backup with no solar at all.
- The catch: once the battery is empty, nothing refills it until the grid returns. For multi-day outages without solar, pair a battery with a generator for recharging, or size the battery for the outages you actually get.
Cost comparison: what drives the price
Prices change too fast to quote, so here is what each option costs you in practice. Get real quotes for anything installed.
| Cost factor | Portable power station | Expandable home station | Installed whole-home battery | Portable generator | Standby generator |
|---|---|---|---|---|---|
| Upfront equipment | Lowest | Mid | Highest | Low | High |
| Installation | None | Transfer switch / home panel (electrician) | Licensed installer, permits, often several thousand dollars | Inlet + interlock or transfer switch recommended | Installer, gas line, concrete pad, permits |
| Ongoing cost | Electricity to recharge | Electricity to recharge | Electricity or solar | Fuel, oil, maintenance | Fuel, annual service |
| Lifespan driver | Battery cycles (LiFePO4: thousands) | Battery cycles | Battery warranty (often 10 years) | Engine hours and upkeep | Engine hours and upkeep |
| Daily savings potential | No | Limited | Yes, with solar and time-of-use rates | No | No |
Five questions to decide
1. How long are your typical outages?
Check your utility’s outage history or ask neighbors. If outages are usually under 12 hours, a 1–2 kWh portable unit plus good habits covers you. If you regularly lose power for days after hurricanes, ice storms, or wildfire shutoffs, you need either a big expandable system or solar recharging.
2. Do you have 240 V must-runs?
A well pump is the classic deal-breaker. Most US submersible pumps run on 240 V, and a 120 V-only power station can’t run them no matter how big the battery is. If you’re on well water, look only at units with 240 V output (or that can pair two units for 240 V), and plan for a transfer switch. See our sump and well pump guide.
3. Do you own or rent?
Renters can’t wire batteries into the panel. Portable is the only real option, and it moves with you.
4. Do you have (or want) solar?
Installed batteries shine when paired with rooftop solar. They can store midday solar for the evening and, depending on your utility’s rate plan, save money every day, not just during outages. A portable station with folding panels is the low-cost version of the same idea.
5. What’s your budget, honestly?
Installed whole-home systems commonly run into five figures after installation and permitting. An expandable station plus a transfer switch typically costs a fraction of that, and a 1 kWh portable costs a fraction again. Price out what you need to run before getting attached to a tier.
Hidden costs and gotchas
- Installation and permits. Installed batteries require a licensed electrician, a permit, and sometimes a utility interconnection agreement. Expandable stations connected to the house also need a transfer switch or interlock installed by an electrician. Never backfeed through a dryer outlet.
- Surge vs continuous. Motors (pumps, compressors, AC) can need 3–6× running watts to start. Check both ratings. Soft-start kits can help AC units.
- Self-discharge and standby draw. Leaving a power station’s inverter on wastes energy. Store units at the manufacturer’s recommended charge level and top them up every few months.
- Weight. A 1 kWh LiFePO4 unit weighs roughly 25–30 lb. A 3.8 kWh unit like the F3800 is well over 100 lb (it has wheels for a reason).
- Warranty. Most quality LiFePO4 power stations now carry 5-year warranties. Installed batteries often carry 10 years. Read who services the unit.
Our recommendation by situation
- Apartment / renter, short outages: a 1 kWh class portable (Anker SOLIX C1000, BLUETTI AC180, or EcoFlow DELTA 2). Add a 200 W solar panel if outages last more than a day. [AFFILIATE LINK: BLUETTI AC180]
- House on city water, occasional multi-day outages: an expandable 3–4 kWh system with one expansion battery and a home transfer panel. Covers fridge, freezer, lights, internet, furnace blower, and medical devices. [AFFILIATE LINK: Anker SOLIX F3800 + expansion battery]
- House on a well, or rural with frequent long outages: a 240 V-capable expandable system or an installed battery, ideally with solar. Get an electrician to do a load calculation first.
- Want daily savings plus backup and you own the home: installed battery plus solar. Get multiple quotes and verify current tax-credit rules with a tax professional.
The bottom line
Most households don’t need a whole-home battery or a standby generator. They need the right circuits to stay on. Start by listing your must-run loads, add their watts, and estimate hours. If the total fits under ~2 kWh a day, a portable station wins on cost and simplicity. If you need 240 V, central AC, or days of autonomy, step up to an expandable or installed system, or a generator. If your outages regularly last for days and you have no solar, a generator (alone or recharging a battery) is often the most practical choice. Just keep it outside.
Free: Outage Runtime Cheat Sheet
Our free cheat sheet has a fill-in load list to do this math for your house in 10 minutes. It’s adapted from DIY Home Battery Power for Beginners by Mr E Powers.
FAQ
Is a power station the same as a generator? No. A gas generator makes power by burning fuel and must run outdoors. A power station stores energy in a battery, is silent, and is safe indoors, but it holds a fixed amount of energy until recharged.
Can I connect a portable power station to my house panel? Only through a properly installed transfer switch or interlock with an inlet box, installed by a licensed electrician. Some brands sell dedicated home panels for this.
How long does a whole-home battery last in an outage? It depends entirely on what’s running. A 13.5 kWh battery might last a day or more on essentials, or just a few hours with central AC and an electric water heater running.
Sources
Manufacturer specs and safety guidance checked October 26, 2026:
– Anker SOLIX C1000 product page
– Anker SOLIX F3800 product page
– CDC: Carbon monoxide safety when using a generator
– Tesla Powerwall specs and Powerwall 3 datasheet