EcoFlow vs Anker vs Bluetti: Portable Power Stations for Home Backup

Portable power stations — big lithium batteries with inverters, AC outlets, and solar inputs, sold under names like EcoFlow, Anker Solix, and Bluetti — have gone from camping gadget to genuine home-backup contender in about five years. The marketing calls them "solar generators," which is a misleading name (there's no generator in the box — it's a battery), but the products themselves are real and, for the right outage scenario, genuinely good.

Portable power stations — big lithium batteries with inverters, AC outlets, and solar inputs, sold under names like EcoFlow, Anker Solix, and Bluetti — have gone from camping gadget to genuine home-backup contender in about five years. The marketing calls them “solar generators,” which is a misleading name (there’s no generator in the box — it’s a battery), but the products themselves are real and, for the right outage scenario, genuinely good.

This article does three things: explains what a power station can and can’t run (with the actual math), compares the three big brands’ flagship home-backup models spec by spec, and gives you an honest framework for when a power station beats a gas generator — and when it doesn’t.

No brand sent me a unit. Nobody’s paying for placement. Specs below are manufacturer ratings; treat real-world runtime as 80–90% of the paper math because inverters aren’t 100% efficient and batteries don’t like giving up their last 10%.

First: the math that decides everything

Every power station decision comes down to one equation:

Watt-hours (Wh) ÷ load in watts (W) = runtime in hours

That’s it. A power station stores a fixed amount of energy (watt-hours — think of it as the size of the fuel tank), and your appliances drain it at a rate measured in watts (think of that as how fast you’re burning fuel).

Worked examples, using real appliance wattages:

Full-size fridge (150W running): a 2,000 Wh station → 2,000 ÷ 150 ≈ 13 hours. Realistically 11–12 hours after inverter losses.
Fridge + Wi-Fi router + phone charging + LED lamps (~250W total): 2,000 ÷ 250 = 8 hours. That’s a full night of essentials.
CPAP machine (~60W without heated humidifier): 2,000 ÷ 60 ≈ 33 hours. Multiple nights, easy.
Microwave (1,000W): 2,000 ÷ 1,000 = 2 hours — but nobody runs a microwave for 2 hours; 10 minutes of reheating uses about 167 Wh, barely a dent.
Space heater (1,500W): 2,000 ÷ 1,500 ≈ 1.3 hours. This is why power stations and electric heat don’t mix — heating eats batteries alive.
Central AC (3,500W running): 2,000 ÷ 3,500 ≈ 35 minutes. Forget it. A power station is not running your central air.

Two more concepts that matter:

Continuous output vs. surge. The inverter’s continuous rating (e.g., 3,600W) is what it can sustain. The surge rating (e.g., 7,200W) is what it can handle for a few seconds when a motor starts. A fridge that runs at 150W might surge to 600–800W when the compressor kicks on. If the surge exceeds the inverter’s rating, the station shuts off — even though the “running” watts looked fine. Always check both numbers against your loads.

Usable capacity. Lithium stations typically let you use 90–100% of rated capacity, but the inverter wastes 10–15% converting DC to AC. Rule of thumb: multiply the rated Wh by 0.85 for realistic AC runtime planning. A “2,048 Wh” station gives you roughly 1,740 usable watt-hours of AC power.

The three flagships, compared

These are the models people actually cross-shop for home backup — the biggest single units from each brand’s home-backup line. All three can be expanded with extra battery modules, which I’ll cover after the table.

	EcoFlow Delta Pro	Anker Solix F3800	Bluetti AC300	Bluetti AC500
Battery capacity	3,600 Wh	3,840 Wh	3,072 Wh (with B300 battery)	5,120 Wh (with B300S battery)
Expandable to	25,000 Wh	53,800 Wh	12,288 Wh	18,432 Wh
Continuous AC output	3,600W	6,000W	3,000W	5,000W
Surge output	7,200W	9,000W	6,000W	10,000W
240V output	Yes (with Double Voltage Hub)	Yes (built-in)	Yes (with Fusion Box, 2 units)	Yes (with Fusion Box, 2 units)
Battery chemistry	LFP (LiFePO4)	LFP (LiFePO4)	LFP (LiFePO4)	LFP (LiFePO4)
Cycle life (to 80%)	~3,500 cycles	~3,000 cycles	~3,500 cycles	~3,500 cycles
Max solar input	1,600W	2,400W	2,400W	3,000W
AC recharge speed	~1,800W (under 2 hrs 0–100)	~1,800W (~2.5 hrs)	~3,000W (with 2×B300)	~5,000W (with 2×B300S)
Weight (base unit)	~99 lbs	~132 lbs	~79 lbs (head) + 79 lbs (battery)	~66 lbs (head) + 84 lbs (battery)
Typical street price	$2,500–$3,200	$3,000–$3,800	$2,600–$3,200 (bundle)	$3,500–$4,500 (bundle)
App / smart features	Yes (mature app)	Yes	Yes	Yes

Prices are typical US street prices and move with sales — all three brands discount aggressively around holidays and storm season. Specs are manufacturer ratings; verify against the current product page before buying, since these lines get refreshed.

EcoFlow Delta Pro — the ecosystem pick

The Delta Pro is the best-known home-backup power station in the US, and the reason is the ecosystem around it: extra batteries (up to 25 kWh total), the Double Voltage Hub for 240V, a Smart Home Panel that wires into your breaker box for automatic switchover, and even a dual-fuel Smart Generator that auto-recharges the batteries when solar can’t keep up. No other brand has this much integration gear.

At 3,600 Wh and 3,600W continuous, one Delta Pro runs the essentials comfortably — fridge, lights, internet, laptops, CPAP — for roughly a day of cycled use. The 240V capability (via the hub, which requires two units or the hub accessory) opens up well pumps and some 240V appliances, but that’s a $5,000+ two-unit setup.

EcoFlow’s app is the most polished of the three — remote monitoring, scheduled charging, firmware updates that actually arrive. The tradeoff: EcoFlow’s product line churns fast, with new models every year, which can make you feel like you bought the “old” one. The Delta Pro itself is a mature product at this point, not a first-gen experiment.

Best for: buyers who want the deepest accessory ecosystem and might expand over time — extra batteries now, Smart Home Panel later.

Anker Solix F3800 — the power pick

The F3800’s headline advantage is raw output: 6,000W continuous from a single unit, with 240V built in — no hub, no second unit. That’s the highest single-unit output in this comparison, and it matters for real loads: a 6,000W inverter can start and run a well pump, run a fridge plus a microwave simultaneously, or handle the surge of a small window AC.

Capacity is 3,840 Wh base, expandable to a massive 53.8 kWh with expansion batteries — the largest expansion ceiling here, enough to genuinely function as a whole-home battery for multi-day outages if you buy enough modules (at which point you’re spending Tesla Powerwall money, but with portability).

The catch is weight and price: 132 lbs is not something you’re carrying upstairs casually (it has wheels and a telescoping handle, like luggage, but still), and it’s typically the priciest of the three base units. Anker’s background is phone chargers and consumer electronics — their power station line is newer than EcoFlow’s or Bluetti’s, though the Solix line has been well-received.

Best for: buyers who need maximum single-unit output — well pumps, 240V loads, or running several big appliances at once without chaining units.

Bluetti AC300 / AC500 — the modular pick

Bluetti does something different: the “head unit” (inverter + controls) is separate from the battery modules. The AC300 head pairs with B300 batteries (3,072 Wh each, up to 4); the AC500 head is beefier (5,000W continuous, 10,000W surge) and pairs with B300S batteries (5,120 Wh each, up to 6 for 30.7 kWh… officially 18,432 Wh max per current specs — check the latest).

The modular design has a practical advantage: the head unit is relatively light (66–79 lbs) and each battery is a separate ~80 lb box. Easier to move in pieces than a 132-lb monolith. It also means you can buy the head now and add batteries later as budget allows — the most granular expansion path of the three.

Bluetti’s solar input is generous (2,400W on the AC300, 3,000W on the AC500), and the brand has a strong reputation in the off-grid and RV communities — lots of long-term owner reports. The app and firmware experience is decent but generally rated a notch below EcoFlow’s polish. Pricing is competitive, often the best $/Wh of the three when bundled.

Best for: buyers who want to start small and expand modularly, or who value the off-grid/RV community track record and strong solar input.

Solar charging: the math nobody does before buying

“Solar generator” marketing implies the sun keeps you running indefinitely. Sometimes it does. Usually the math is tighter than people expect.

The equation: solar panel watts × peak sun hours × 0.75 (real-world derating for angle, heat, clouds) = Wh harvested per day.

Worked example — 800W of panels (a common portable setup, four 200W panels), 5 peak sun hours (decent US average; the Southeast and Southwest get more, the Northeast and Pacific Northwest get fewer):

800 × 5 × 0.75 = 3,000 Wh per day

That’s enough to fully recharge a 3,600 Wh Delta Pro in a bit over a day — if you’re not drawing power at the same time. But you are: the fridge alone eats ~150W × 24h ≈ 3,600 Wh/day if it runs constantly (in practice, a fridge cycles — figure 1,500–2,500 Wh/day real consumption).

So the honest solar picture for outage use:

Sunny climate, 800W+ of panels, modest loads (fridge + lights + devices ≈ 2,000–2,500 Wh/day): solar roughly breaks even. You can ride indefinitely.
Cloudy/stormy weather (the actual conditions during a hurricane outage): solar output drops to 10–25% of rated. Your 800W array makes 400–800 Wh/day. You’re draining the battery faster than the sun refills it. Plan for 2–4 days of battery, not infinite.
Winter, northern latitudes, short days: 2–3 peak sun hours is normal. Halve all the sunny-day numbers.

Practical takeaway: size the battery for 2–3 days of your actual loads with zero solar, and treat solar as a stretch bonus. If your outage plan requires perfect sunshine during a hurricane, it’s not a plan. And if you buy panels, buy more watts than you think — panel wattage is the cheapest part of the system (roughly $0.50–$1.00/W for rigid panels), while battery Wh is the expensive part ($0.70–$1.00+/Wh).

Recharge speed from the wall matters too: when the grid flickers back on for a few hours (common during restoration), a station that charges at 1,800W grabs 3,600 Wh in two hours. A slow-charging station wastes that window. All three flagships charge fast enough — this is mostly a warning against cheap no-name stations that trickle-charge at 200W.

When a power station beats a gas generator

Power stations win in specific scenarios — and it’s not close:

Indoor-safe operation. No combustion, no CO, no fumes. You can run a power station in your living room, bedroom (CPAP users, take note), or apartment. This alone makes it the only option for apartment dwellers, condo owners with HOA generator bans, and anyone who can’t safely place a gas generator 20 feet from the building.
Silent operation. Zero dB. Run it at 2 AM next to a sleeping baby, in a noise-restricted neighborhood, or at a campsite without becoming the enemy. Gas generators — even “quiet” inverter models at 52–58 dB — are still audible.
No fuel logistics. No gas cans, no stabilizer, no rotation schedule, no 2 AM gas station runs during an outage. Charge it from the wall before storm season and it’s ready. For the “I want backup but I never want to think about it” buyer, this is huge.
Instant, automatic switchover. Paired with a transfer switch or EcoFlow’s Smart Home Panel, a power station switches over in milliseconds — your Wi-Fi never drops, the CPAP never stops. A standby gas generator takes 10–30 seconds to start and transfer. A portable takes however long you take to walk outside in the rain.
Maintenance-free. No oil changes, no spark plugs, no carburetors gumming up, no “won’t start” after sitting for a year. The battery degrades slowly (LFP chemistry: ~3,000–3,500 cycles to 80% capacity — at one full cycle per week, that’s 60+ years; calendar aging will get it first, realistically 10–15 years of useful life).
Clean power for electronics. Pure sine wave output with tight voltage regulation — safe for anything, including sensitive medical devices and modern furnace control boards that sometimes object to cheap generator power.

When a gas generator wins (and it’s not close either)

Runtime per dollar. A $900 portable gas generator with $50 of gasoline delivers 30–40 kWh of energy. A $3,000 power station delivers 3.6 kWh. That’s roughly a 10:1 energy-per-dollar advantage for gas. For multi-day outages, gas wins on economics by a landslide.
High-wattage loads. Central AC (3,500–5,000W running), electric water heaters (4,500W), electric dryers, well pumps with big starting surges — a portable gas generator in the 7,500–9,500W class handles these routinely. A single power station mostly doesn’t, and chaining multiple stations to get there costs $6,000–$10,000+.
Extended outages. A gas generator runs as long as you can feed it fuel — days, weeks. A power station without strong solar is a 1–3 day device. After Hurricane Ian, some Florida neighborhoods were dark for a week+. Gas owners with fuel cycled through it; battery-only owners were done by day three unless they had serious solar.
Refuel speed. Five minutes with a gas can vs. hours of solar or wall charging. During an outage with intermittent grid power, that difference matters.
Upfront cost for whole-home coverage. A 22 kW standby gas generator installed ($10,000–$14,000) runs the entire house including central AC, indefinitely on natural gas. Matching that with batteries means 40–60 kWh of storage — $25,000–$40,000+ in power stations or a Tesla Powerwall-class system.

The honest middle ground most people should consider

Here’s what actually makes sense for a lot of homeowners, and what almost no marketing material suggests because nobody sells both:

A mid-size portable gas generator ($800–$1,200) for heavy loads + a mid-size power station ($1,000–$2,000) for silent overnight essentials.

The gas generator runs the fridge, freezer, and cooking during the day. At night, you shut it down (saving fuel, saving your neighbors’ sanity) and the power station silently runs the CPAP, phones, a lamp, and the Wi-Fi until morning. Total cost: roughly $2,000–$3,000 — less than a single flagship power station — covering both the high-energy daytime loads and the silent nighttime loads better than either device alone.

Alternatively, if your outage scenario is “12–36 hours, a few times a year” — which describes most suburban US outage experience outside hurricane and ice-storm zones — a single 2–3 kWh power station ($1,500–$2,500) genuinely covers it with zero fuel, zero noise, and zero maintenance. That’s the sweet spot where power stations are not just competitive but clearly better.

Buying checklist

Size by watt-hours for duration, by watts for capability. Need 2 days of fridge + devices (~5,000 Wh)? That’s the battery size. Need to start a well pump (2,000W surge)? That’s the inverter size. Both numbers must clear your loads independently.
LFP (LiFePO4) chemistry only for home backup. It’s what all three flagships use — longer cycle life and far better thermal stability than older NMC lithium. Don’t buy a no-name NMC station for indoor home use to save a few hundred dollars.
Check the 240V story if you need it (well pump, some furnaces). Anker has it built in; EcoFlow needs the Double Voltage Hub; Bluetti needs two heads + Fusion Box. “240V-capable” and “240V out of the box” are different price tags.
Count the expansion ceiling if you might grow. Delta Pro: 25 kWh. F3800: 53.8 kWh. AC500: 18.4 kWh. If whole-home battery backup is a someday-goal, the ceiling matters more than the base unit.
Verify solar input voltage limits before buying panels — each station has a max VOC (open-circuit voltage), and exceeding it can damage the charge controller. This is the most common DIY solar-panel mistake.
Weight and placement. 99–132 lbs for single units. Decide where it lives before the outage — near the loads it serves, since long extension cord runs waste power and create trip hazards.

The bottom line

Portable power stations are a real home-backup category now, not a gadget. For short outages (under 2 days), apartments, medical devices, silent nighttime power, and anyone who won’t maintain a gas engine, they’re arguably the best option — the EcoFlow Delta Pro for ecosystem, the Anker Solix F3800 for max single-unit power, the Bluetti AC500 for modular expansion.

For multi-day outages, whole-home coverage, central AC, or tight budgets, gas still wins decisively on energy per dollar. And for a lot of households, the smartest $2,500 spent is one of each — gas for the heavy lifting, battery for the quiet hours.

Size it with the Wh ÷ W math, be honest about your outage history (how long do your outages actually last?), and don’t let “solar generator” marketing do your planning for you.