Home backup
Anker SOLIX F3800 vs EcoFlow DELTA Pro 3
These are the two flagship home-backup power stations, and they are built for the same job: keeping a house running when the grid drops. The F3800 brings the bigger inverter, 6,000W with real 240V, and the deeper single-unit expansion path. The DELTA Pro 3 brings more capacity in the base box, much faster recharging, and the most mature smart-panel ecosystem. Which one is right depends on how big your backup ambitions are.
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| Spec | Anker SOLIX F3800 | EcoFlow DELTA Pro 3 |
|---|---|---|
| Capacity | 3,840Wh | 4,096Wh |
| AC continuous output | 6,000W | 4,000W (X-Boost to 6,000W) |
| AC surge | 9,000W | 8,000W |
| 120V/240V split-phase | Yes, one unit | Yes, one unit |
| Expansion, single unit | 26.9kWh (6 batteries) | 12kWh (2 batteries) |
| Expansion, full system | 53.8kWh (2 units) | 48kWh (multi-unit) |
| Solar input | 2,400W (2 ports) | 2,600W (2 ports) |
| Wall recharge | 1,800W max | 1,800W @120V, 3,600W @240V, 80% in ~50 min |
| UPS switchover | Under 20ms | 10ms |
| Weight | 132.3 lb, wheels + handle | 113.5 lb, wheels + handle |
| 120V AC outlets | 6x NEMA 5-20 | 4x NEMA 5-20R + TT-30 (30A RV) |
| 240V outlets | NEMA 14-50 + L14-30 | NEMA 6-20R + L14-30 |
| USB ports | 3x 100W USB-C, 2x USB-A | 2x 100W USB-C, 2x USB-A |
| Battery chemistry | LiFePO4 | LiFePO4 |
| Cycle rating | 3,000+ | 4,000 to 80% |
| Home panel option | Anker Home Power Panel | Smart Home Panel 2 or transfer switch |
| Warranty | 5 years | 5 years |
Where each one wins
F3800 wins on output and growth
The F3800 sustains 6,000W with a 9,000W surge and delivers real 120V/240V from one box, so it starts a well pump or runs a dryer that strains the DELTA Pro 3. It also has the deeper single-unit runway: stack six expansion batteries and one F3800 carries 26.9kWh, enough to hold a home's essentials for days. Add the NEMA 14-50 outlet, six 120V outlets, and three 100W USB-C ports and it is simply the bigger electrical toolbox.
DELTA Pro 3 wins on speed and ecosystem
The DELTA Pro 3 packs more capacity into the base unit at 4,096Wh, weighs almost 19 pounds less, and recharges far faster, up to 3,600W from a 240V input with 80 percent in about 50 minutes at its top rate. It takes slightly more solar at 2,600W, switches to battery in 10ms as a UPS, and carries the higher 4,000-cycle rating. EcoFlow's Smart Home Panel 2 and transfer-switch options are also the most mature way to wire backup into your circuits.
Essentials backup or whole-home ambitions?
Start with an honest answer about what you are backing up, because it decides this comparison. If the plan is essentials, a fridge, a freezer, internet, lights, phones, and a CPAP plugged straight into the unit, both are frankly overkill in the best way, and the DELTA Pro 3's extra base capacity and faster recharge make it the easier unit to live with. No electrician needed, just run cords to the gear that matters.
If the plan is feeding your home's actual circuits so the lights and outlets work like normal, both brands sell the hardware: Anker's Home Power Panel for the F3800, and EcoFlow's Smart Home Panel 2 or a transfer switch for the DELTA Pro 3. Either route involves an electrician and real money. The F3800's bigger inverter means more of your panel can run at once, while EcoFlow's panel hardware has been in the field longer and is better documented. For the full breakdown of what backup at each level costs in practice, see our home backup guide.
The expansion path, before you buy
Think about year three, not week one. One F3800 grows to 26.9kWh by chaining up to six 3,840Wh batteries onto the same inverter, and a second coupled F3800 takes the system to 53.8kWh with 12,000W of output. A single DELTA Pro 3 accepts two extra batteries for 12kWh, and going past that means a second base unit and the Smart Home Panel 2, with a system ceiling of 48kWh. If you suspect your needs will grow, the F3800 lets you add capacity in smaller steps for longer before you rebuy the expensive part. If 12kWh comfortably covers your worst outage, the DELTA Pro 3's path is plenty.
Recharging when the grid is down
In a multi-day outage the wall is gone and solar becomes the refill plan, and here the two are close. The F3800 accepts 2,400W of solar across two ports, and Anker rates it at 80 percent in about 1.5 hours of strong sun at full input. The DELTA Pro 3 takes 2,600W across a high-voltage port and a low-voltage port, which makes it more flexible about mixing panel types. Either way, plan your panel budget with the unit, because a battery this size with a few hundred watts of panels refills slowly. Our hurricane backup power checklist walks through the prep sequence, including topping up before landfall, which is where the DELTA Pro 3's fast 240V wall charging is a genuine storm-season advantage.
Noise and UPS behavior indoors
Both units are built to live inside the house, and both are dramatically quieter than any gas generator. EcoFlow publishes a roughly 30dB figure for the DELTA Pro 3 under a 2kW load, quieter than a library, and its 10ms UPS switchover means a desktop or CPAP plugged through it never notices the grid drop. The F3800's switchover is rated under 20ms, which is also well within what sensitive electronics tolerate. Expect fans on either unit during heavy loads and fast charging. As always-on UPS boxes for an office or bedroom, both pass, with the DELTA Pro 3 holding the tighter published numbers.
The honest downsides
F3800 cons
It is 132.3 pounds, and even with wheels and a retractable handle, stairs are a two-person job. Wall charging tops out at 1,800W, so a full refill takes a couple of hours where the DELTA Pro 3 is nearly done. The cycle rating is lower at 3,000+, the base unit holds slightly less than the DELTA Pro 3, and reaching its headline capacity means buying expansion batteries that each cost as much as a midsize power station.
DELTA Pro 3 cons
The 4,000W continuous output is the real number; X-Boost stretches it to 6,000W only for certain appliances and does not help hard-starting motor loads, so heavy 240V gear has less headroom here. A single unit caps at 12kWh, so growing past that means a second base unit plus panel hardware. It is still a 113.5-pound machine, it has two fewer 120V outlets and one fewer 100W USB-C port than the F3800, and its fastest charging needs a 240V input most garages do not have wired.
Which should you buy?
For the biggest backup ambitions, buy the Anker SOLIX F3800. The 6,000W inverter with a 9,000W surge runs heavy 240V loads the DELTA Pro 3 strains against, and the single-unit path to 26.9kWh means you can keep growing the system for years without rebuying the inverter. If a well pump, a dryer, or eventual whole-home coverage is on your list, it is the more capable platform.
For most households backing up the essentials, buy the EcoFlow DELTA Pro 3. You get more capacity in the base box, a recharge fast enough to top up in the gap between forecast and landfall, the tighter UPS spec, a higher cycle rating, and the most mature smart-panel ecosystem if you later wire it into your circuits. Both are LiFePO4 with 5-year warranties, so either way you are buying a decade-class machine. The question is simply how far you plan to push it.
Keep going
- See how these two stack up against the rest of the class: best solar generators for home backup.
- Prepping for a storm? Run the hurricane backup power checklist.
- Want big capacity without the flagship size? Read our Anker SOLIX F3000 review, the F3800's smaller sibling.
- Compare more big batteries: best 3000Wh-class power stations.
- Estimate runtimes for your own gear with the Run-Time Calculator.
Frequently Asked Questions
Can either one actually back up a whole house?
Not out of the box, and no single battery on the market can. A whole house pulls more than any one unit delivers, so both brands solve it the same way: a hardwired panel that feeds your home's circuits, plus expansion batteries. Anker pairs the F3800 with its Home Power Panel, and EcoFlow pairs the DELTA Pro 3 with the Smart Home Panel 2 or a transfer switch. Most people skip all of that and back up essentials instead, a fridge, a freezer, internet, lights, and medical gear plugged straight into the unit. That covers what matters in a storm for a fraction of the cost, and both units handle it easily.
Which one recharges faster from the wall?
The DELTA Pro 3, clearly. On a standard 120V outlet both units pull up to 1,800W, but the DELTA Pro 3 can also take 3,600W from a 240V input, and EcoFlow rates it at 80 percent in about 50 minutes at its fastest charging rate. The F3800 tops out at 1,800W from the wall, so refilling its 3,840Wh takes a couple of hours at best. Before a storm, when you are topping up between errands, that gap is the DELTA Pro 3's strongest card.
Which one expands further?
On a single unit, the F3800 by a wide margin. It accepts up to six 3,840Wh expansion batteries for 26.9kWh on one inverter, where a single DELTA Pro 3 tops out at 12kWh with two extra batteries. At the full-system level they converge: two coupled F3800 systems reach 53.8kWh, and a multi-unit DELTA Pro 3 setup with the Smart Home Panel 2 reaches 48kWh. The practical difference is that Anker lets you grow much further before you need to buy a second base unit.
Can they run a well pump or other 240V appliances?
Yes, both. Each unit puts out real 120V/240V split-phase power from a single box, which is rare in this category and the main reason these two get cross-shopped. The difference is headroom. The F3800 sustains 6,000W with a 9,000W surge, while the DELTA Pro 3 sustains 4,000W with an 8,000W surge. A typical well pump starts hard, and motor loads are exactly where that extra continuous and surge capacity earns its keep, so the F3800 is the safer pick for heavy 240V gear.
Which one works better as a UPS for sensitive electronics?
Both are genuinely good at this, which is part of why they cost what they do. The DELTA Pro 3 switches over in 10 milliseconds, and the F3800 is rated under 20 milliseconds. Either is fast enough that a desktop computer, router, or CPAP rides through a blackout without a blink. If you want the tightest spec on paper the DELTA Pro 3 has it, but in practice you will not notice a difference. Plug your sensitive gear into either unit while it sits on wall power and it becomes a giant battery backup.