Comparison · Spec-based
EcoFlow vs Bluetti vs Anker SOLIX: Best Solar Generator for Home Backup (2026)
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If you want a battery "solar generator" that can back up real household circuits (fridge, furnace fan, well or sump pump, maybe a 240V appliance), the three flagship options in 2026 are the EcoFlow DELTA Pro 3, the BLUETTI Apex 300 and the Anker SOLIX F3800 Plus. All three use LFP (lithium iron phosphate) batteries, all three offer 120V/240V output, and all three can grow from one box into a multi-day home system. Where they differ is in the details that decide whether one fits your house.
Quick picks
- Biggest single-box battery, fastest UPS among the three on standard outlets: EcoFlow DELTA Pro 3, with 4,096Wh and a 10 ms UPS switchover.
Check DELTA Pro 3 price at EcoFlow(paid link) - Most continuous power per unit and most solar input: Anker SOLIX F3800 Plus, with 6,000W output and 3,200W solar input.
Check F3800 Plus price at Anker SOLIX(paid link) - Lowest entry price and the highest cycle rating: BLUETTI Apex 300, rated for 6,000 cycles to 80%. It has the smallest base battery (2,764.8Wh).
Check Apex 300 price at BLUETTI(paid link)
Side-by-side spec table
| Spec | EcoFlow DELTA Pro 3 | BLUETTI Apex 300 | Anker SOLIX F3800 Plus |
|---|---|---|---|
| Battery capacity | 4,096Wh[1] | 2,764.8Wh[3] | 3,840Wh[6] |
| Chemistry | LFP[1] | LiFePO₄ (LFP)[3] | LFP[6] |
| Continuous AC output | 4,000W (6,000W with X-Boost)[1] | 3,840W[3] | 6,000W[6] |
| Surge / peak | 8,000W surge[1] | 7,680W "lifting power"[3] | Not listed on spec page |
| Voltage | 120V or 240V (one mode at a time)[1] | 120V and 240V at the same time (per BLUETTI)[3] | 120V/240V via L14-30R; 240V unavailable while charging from 120V AC[6] |
| Max expansion, one unit | 12kWh (2 extra batteries)[1] | 19,353.6Wh (6× B300K) or 33,484.8Wh (6× B500K)[4] | 26,880Wh (6× BP3800)[7] |
| Max system (multiple units) | 36kWh battery; up to 48kWh with 3 Smart Generators; 12kW[1] | Up to 58kWh and 11.52kW (2–3 units)[3] | Up to 53.8kWh and 12kW (2 units + Double Power Hub)[6][8] |
| Max solar input | 2,600W (2 ports)[1] | 2,400W base; more with SolarX 4K accessory[5] | 3,200W (2 × 1,600W, 11–165V)[6] |
| UPS switchover | 10 ms[1] | 0 ms in 12kW bypass mode, otherwise <20 ms[5] | 20 ms[7] |
| Rated cycle life | 4,000 cycles to 80%[1] | 6,000 cycles to 80%[9] | 3,000+ cycles (to 80%)[6] |
| Weight | 113.54 lb[1] | 83.78 lb[9] | 136.7 lb[6] |
| Warranty | 5 years (3 standard + 2 with app registration)[1] | 60 months[10] | 5 years[6] |
| USB / DC ports on the unit | Yes (2× USB-C 100W, 2× USB-A, 12V DC)[1] | None; needs the optional Hub D1[5] | Yes (USB-C 100W, USB-A, 12V car)[6] |
Bracketed numbers match the sources list. Manufacturers change specs and bundles; check the live product page before buying.
Capacity and runtime: how long will each one last?
Capacity (watt-hours, Wh) decides how long a unit runs. The EcoFlow has the biggest single box at 4,096Wh, the Anker is close behind at 3,840Wh, and the BLUETTI Apex 300 starts at 2,764.8Wh.
You never get every rated watt-hour out of a battery at the outlet, because the inverter that turns battery power into household AC loses some energy. EcoFlow's own example gives a sense of the size of that loss: it says one DELTA Pro 3 runs a 120W refrigerator for 27.3 hours[2]. Dividing 4,096Wh by 120W would give 34.1 hours, so EcoFlow's figure works out to roughly 80% of rated capacity. We use that same 80% assumption below. Treat it as an estimate, not a spec.
| Average load | DELTA Pro 3 (4,096Wh) | Apex 300 (2,764.8Wh) | F3800 Plus (3,840Wh) |
|---|---|---|---|
| 150W (fridge average + router + a few LED lights) | ≈21.8 h | ≈14.7 h | ≈20.5 h |
| 300W (adds furnace fan cycling, TV, phone charging) | ≈10.9 h | ≈7.4 h | ≈10.2 h |
| 600W (adds sump pump duty, microwave use) | ≈5.5 h | ≈3.7 h | ≈5.1 h |
Math: capacity × 0.80 ÷ average watts. Your real numbers depend on what's actually running. Use our outage runtime calculator with your own appliances.
For context, the U.S. Energy Information Administration reports that the average electricity customer went without power for about 11 hours in total during 2024, and that major events such as hurricanes caused about 80% of those hours[11]. A single box of any of these three covers a typical short outage for essential loads. For multi-day storm outages you'll want extra batteries, solar panels, a gas generator to recharge from, or all three.
Output, 240V and big loads
Continuous output (watts) decides what you can run at the same time. This is where the Anker stands out: 6,000W continuous from one unit[6], compared with 4,000W for the EcoFlow (6,000W for supported devices with X-Boost[1]) and 3,840W for the BLUETTI[3].
Motor loads such as compressors, well pumps and sump pumps briefly draw two to three times their running watts when they start. Champion Power Equipment's wattage chart, for example, lists a refrigerator at 150–400W running but 800–1,200W starting, and a 1 HP well pump at 1,000–2,000W running and 2,000–4,000W starting[12]. EcoFlow lists an 8,000W surge rating and BLUETTI lists 7,680W of "lifting power". Anker's spec page doesn't give a separate surge figure, so check with Anker if you plan to start a large motor.
The 240V detail that matters: EcoFlow's FAQ says the DELTA Pro 3 outputs 120V or 240V. Pressing the 240V button switches off its 120V outlets, and vice versa[1]. Plugged into a transfer switch or inlet box through its L14-30R outlet, it supplies split-phase power to the house panel, so this mostly matters if you're plugging appliances straight into the unit. BLUETTI says the Apex 300 can power 120V and 240V devices at the same time[3]. Anker notes that the F3800 Plus can't provide 240V output while it is charging from a 120V wall outlet[6].
EcoFlow says the DELTA Pro 3 can run a 3-ton central AC, with a footnote that this was tested with a soft starter installed on the AC[1]. If central air is on your list, budget for a soft starter and ask an HVAC technician.
Expansion to whole-home backup
All three are modular. One unit plus extra batteries handles essentials, and two or three units together can approach whole-home backup:
- EcoFlow DELTA Pro 3: up to 12kWh per unit with two Smart Extra Batteries. Up to three units can connect to the Smart Home Panel 2 for 36kWh of battery and 12kW of output. EcoFlow quotes "up to 48kWh" when three Smart Generator 4000 dual-fuel generators are added[1].
- BLUETTI Apex 300: up to six B300K (2,764.8Wh each) or six B500K (5,120Wh each) batteries per unit. Two to three Apex units and up to 18 batteries reach 11.52kW and 58kWh, according to BLUETTI[3][4].
- Anker SOLIX F3800 Plus: up to six BP3800 batteries (3,840Wh each) for 26,880Wh per unit. Two units joined by the Double Power Hub give 12kW and up to 53.8kWh[6][8].
Getting from "box on the floor" to "lights in the house come on automatically" requires a transfer switch, an inlet box or the brand's smart panel (EcoFlow Smart Home Panel 2, BLUETTI AT1 panel, Anker Home Power Panel). EcoFlow notes that its Smart Home Panel 2 "requires installation", with fees depending on the assessment[1]. Plan on a licensed electrician and possibly a permit.
Recharging: solar, wall outlet and gas generator
During a long outage, how fast you can refill the battery matters as much as how big it is.
- Solar: the F3800 Plus takes the most built-in solar, at 3,200W across two 11–165V inputs[6]. The DELTA Pro 3 takes 2,600W across a high-voltage port (30–150V, 1,600W) and a low-voltage port (11–60V, 1,000W)[1]. The Apex 300 accepts 2,400W on its own[5], and BLUETTI sells a SolarX 4K accessory for much larger arrays[3]. EcoFlow points out that reaching the maximum input depends on your panels and conditions[1].
- Wall outlet: EcoFlow advertises 0–80% in 50 minutes with its X-Stream charging[1]. Anker lists 1,800W of AC charging from a 120V outlet[6]. BLUETTI lists 1,400W standard AC charging and up to 3,840W at 50A[9].
- Gas generator: all three are designed to pair with a generator for long outages. EcoFlow's Smart Generator 4000 can start and stop automatically with the DELTA Pro 3[1]. Anker lists 3,300W generator charging for a single F3800 Plus, or 6,000W with an expansion battery attached (adapter required)[7]. For a hybrid setup, see our cost comparison.
UPS switchover speed
If the unit stays plugged into the wall and powers your devices, a "UPS" (uninterruptible power supply) feature switches to battery when the grid fails. Faster is better for computers, network gear and CPAP machines. The spec sheets list 10 ms for the DELTA Pro 3[1] and 20 ms for the F3800 Plus[7]. BLUETTI says the Apex 300 reaches 0 ms in its 12kW bypass mode and under 20 ms otherwise[5]. We haven't measured any of these ourselves. If a device is truly critical (medical equipment, for instance), check with its maker.
Battery life, warranty and weight
All three use LFP chemistry, which is known for long cycle life. The rated numbers differ: 6,000 cycles to 80% for the BLUETTI Apex 300[9], 4,000 cycles to 80% for the EcoFlow[1] and 3,000+ cycles for the Anker[6]. For outage-only use, where you might fully cycle the battery a few dozen times a year, any of them should outlast its warranty. Cycle life matters more if you plan to discharge daily to shift solar or time-of-use electricity.
Warranties are similar: five years from all three. EcoFlow's five years is three standard plus two more when you register in its app[1]. BLUETTI lists 60 months for the Apex 300[10], and Anker five years[6].
These are heavy machines. The Apex 300 is the lightest at 83.78 lb[9] but has no wheels in the base configuration (BLUETTI sells a trolley). The DELTA Pro 3 weighs 113.54 lb with built-in wheels[1], and the F3800 Plus weighs 136.7 lb including wheels[6]. One more practical point: the Apex 300 has no USB or 12V outlets on the unit itself without the Hub D1 accessory[5].
On safety certification, EcoFlow lists the DELTA Pro 3 as UL9540 certificated in its US product title[1]. If your local building department or insurer cares about certifications for a permanently connected system, ask each manufacturer for the documents that apply to your setup.
Price per watt-hour
Prices on these units change constantly, with frequent sales and bundles, so don't rely on any number here. For a sense of scale, on October 17, 2026 the manufacturers' own US stores listed:
| Unit (base, no extra batteries) | Listed price on manufacturer store, Oct 17 2026 | Price per Wh |
|---|---|---|
| EcoFlow DELTA Pro 3 | $2,799 (listed "compare at" $3,299)[1] | ≈$0.68/Wh |
| BLUETTI Apex 300 | $1,599 (listed "compare at" $1,699)[3] | ≈$0.58/Wh |
| Anker SOLIX F3800 Plus | We couldn't reliably read a single base price from the store page; check the live price. | n/a |
Price per watt-hour on the base unit doesn't tell the whole story. A smaller base battery is cheaper to buy but runs for less time, and you may end up buying an expansion battery sooner. Price out the whole system you need (units, batteries, panels, transfer switch or panel, plus installation) before comparing.
Which one should you buy?
Choose the EcoFlow DELTA Pro 3 if you want the most battery in one box, a 10 ms UPS, built-in USB and DC ports, and a clear route to a smart-panel whole-home system. Keep in mind that it outputs 120V or 240V one mode at a time when you plug appliances straight into it.
See the DELTA Pro 3 at EcoFlow(paid link)
Choose the Anker SOLIX F3800 Plus if you need to run heavier loads at once (6,000W continuous) or you plan a large solar array (3,200W input). It's the heaviest of the three, and it can't provide 240V while charging from a 120V outlet.
See the F3800 Plus at Anker SOLIX(paid link)
Choose the BLUETTI Apex 300 if you want the lowest buy-in, the longest rated cycle life, and room to grow to very large systems with B500K batteries. You'll likely want at least one expansion battery, and the Hub D1 if you need USB ports.
See the Apex 300 at BLUETTI(paid link)
Not sure how big you need to go? Run the calculator first. If you're weighing a battery against a gas or standby generator, read Solar vs gas vs standby: real costs compared.
Sources
- EcoFlow US, DELTA Pro 3 product page and FAQ (specs, expansion, UPS, warranty, 120V/240V FAQ, listed price on Oct 17 2026): us.ecoflow.com/products/delta-pro-3-portable-power-station
- EcoFlow Canada, DELTA Pro 3 page (example runtimes: refrigerator 120W, 27.3 hours): ecoflow.com/ca/delta-pro-3-portable-power-station
- BLUETTI US, Apex 300 product page (capacity, output, lifting power, 120V/240V, multi-unit scaling, listed price on Oct 17 2026): bluettipower.com/products/apex-300-home-battery-backup
- BLUETTI US, Home Battery Backup collection (expansion tables with B300K/B500K): bluettipower.com/collections/home-battery-backup?page=2
- BLUETTI, "Apex 300 vs. Elite 400" buying guide (base solar input, UPS modes, Hub D1 for DC ports): bluettipower.com/blogs/buying-guide/apex-300-vs-elite-400
- Anker SOLIX US, F3800 Plus product page (tech specs, 240V note, warranty, weight): ankersolix.com/products/f3800-plus
- Anker SOLIX, F3800 Plus User Guide (UPS 20 ms, expansion to 26,880Wh, generator recharging): support.ankersolix.com, F3800 Plus User Guide
- Anker SOLIX, F3800/F3800 Plus FAQ (two units + Double Power Hub = 12,000W): service.ankersolix.com, F3800 FAQ
- BLUETTI Apex Series flyer (6,000 cycles, 38 kg / 83.78 lb, AC charging): bluetti.com, Apex Series flyer (PDF)
- BLUETTI Product Warranty Period (Apex 300: 60 months): checkout.bluettipower.com/pages/product-warranty-period
- U.S. EIA, "Hurricanes in 2024 led to the most hours without power in the United States in 10 years" (Dec 1, 2025): eia.gov/todayinenergy/detail.php?id=66744
- Champion Power Equipment, Generator Wattage Chart: championpowerequipment.com/generator-wattage-chart
- IRS, FAQs on modification of 25D under Public Law 119-21: irs.gov, OBBB FAQs