EcoFlow Delta Pro 3 vs Anker SOLIX F3800: Which Whole-Home Battery Wins in 2026?
Recommended4.4 / 5
Key takeaways
- The F3800 gives you native 240V split phase from one box plus 6,000W continuous, so it runs a well pump, AC, or EV charger without tricks.
- The Delta Pro 3 is lighter, recharges faster (80% in about 50 minutes from AC, per EcoFlow), and pushes more solar, which suits frequent charge cycles and time-of-use arbitrage.
- For most whole-home backup buyers in 2026 the F3800 is the safer default; the Delta Pro 3 wins for solar-heavy and mobile setups.
If you are shopping for a battery that can actually carry a house through an outage, two units dominate the 2026 shortlist: the EcoFlow Delta Pro 3 and the Anker SOLIX F3800. They look similar on a spec sheet, but they make very different trade-offs. This is a head to head that focuses on what changes your day, not what looks good in an ad.
A note on integrity before we start. The numbers below are manufacturer specifications pulled from EcoFlow and Anker, clearly labeled as such. Our own bench testing of both units is planned, and measured results will follow in our standalone Delta Pro 3 review and Anker SOLIX F3800 review. Where we say a number, it is the spec, not a claim we have verified on a meter yet.
Spec comparison (manufacturer figures)
| Spec (manufacturer) | EcoFlow Delta Pro 3 | Anker SOLIX F3800 |
|---|---|---|
| Usable capacity | 4,096Wh | 3,840Wh |
| Chemistry | LFP, 4,000 cycles to 80% | LFP, 3,000+ cycles |
| AC continuous | 4,000W (6,000W X-Boost) | 6,000W |
| Surge / peak | 8,000W (12,000W X-Boost surge) | 9,000W |
| 240V split phase | Yes, one mode at a time (L14-30) | Yes, native, NEMA 14-50 and L14-30 |
| Max solar input | 1,600W | 2,400W |
| AC recharge | Up to 3,600W, about 80% in 50 min | Up to 1,800W |
| Expansion | Up to 48kWh | Up to 26.9kWh (6 batteries) |
| Weight | About 113 lbs | About 132 lbs |
| Typical 2026 price | About $2,599 to $3,199 | About $2,399 (Plus higher) |
Two lines deserve a second look. The F3800 delivers 120V and 240V at the same time from one unit, while the Delta Pro 3 switches between 120V and 240V modes rather than serving both at once. On the other side, EcoFlow lists a much faster AC recharge and higher solar input. Those two facts drive most of the buying decision.
What actually decides it in practice
Spec sheets flatten things that matter in a real house. Here is where the difference shows up.
240V loads. If you need to run a well pump, a central air conditioner, an electric water heater, or charge an EV, the F3800 is the cleaner answer. Its NEMA 14-50 outlet drives those loads directly, and it can serve 120V and 240V simultaneously. The Delta Pro 3 can do 240V through its L14-30 split-phase socket, but not at the same time as a full 120V load from the same port, which is a real constraint in a panel-tie scenario.
Surge headroom. Motors spike hard on startup. A deep well pump or a compressor can pull two to three times its running watts for a moment. Both units have margin, but the F3800’s 6,000W continuous gives you more comfortable room before you even count surge. Use our battery sizing calculator with the actual nameplate of your largest motor to see which unit clears it.
Recharge and cycling. This is where the Delta Pro 3 pulls ahead. EcoFlow rates it for roughly 80% in 50 minutes from AC and up to 1,600W of solar. If you live somewhere with frequent short outages, or you plan to cycle the battery daily for time-of-use arbitrage, faster turnaround and higher solar input matter more than raw 240V muscle. Run your local rate plan through the time-of-use arbitrage calculator to see whether that faster cycling pays for itself.
Weight and placement. Neither of these is portable in any honest sense. The Delta Pro 3 is lighter and has wheels, so a one-person reposition is plausible. The F3800 at around 132 lbs is a set-it-and-leave-it unit. If it lives in the garage wired to a transfer switch, weight is irrelevant. If you want to move it to a job site or RV, factor it in.
Recommendation by use case
Whole-home backup with 240V appliances. Go F3800. Native simultaneous split phase, 6,000W continuous, and the NEMA 14-50 outlet make it the right default for the buyer who wants to keep the well, the AC, and the fridge running without rewiring around a limitation.
Solar-first or daily cycling. Go Delta Pro 3. Faster AC recharge, more solar input, and a slightly larger battery make it the better fit if you are charging from panels often or arbitraging your utility rate. Confirm the payback math with the solar battery ROI calculator.
Mobile, semi-portable, or mixed duty. Lean Delta Pro 3 for the lower weight and wheels, unless your mobile loads are specifically 240V, in which case the F3800 earns its bulk.
Maximum expansion. Go Delta Pro 3 if you want a path to 48kWh. The F3800 tops out near 26.9kWh per unit, which is plenty for most homes but a real ceiling if you are planning a large off-grid build.
The honest verdict
For the typical 2026 whole-home backup buyer, the Anker SOLIX F3800 is the safer pick because it removes the 240V asterisk: one box, both voltages, 6,000W, done. The EcoFlow Delta Pro 3 is the better tool for solar-heavy homes and anyone who values fast recharge and a big expansion ceiling. Neither is a wrong answer; they are aimed at different houses.
Want the broader field before you commit? See our roundup of the best home backup battery for 2026, browse all of our reviews, or read our setup guides for transfer-switch wiring.
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The good
- Native 120V/240V split phase from a single unit at 6,000W continuous
- NEMA 14-50 outlet drives EV chargers and large 240V loads directly
- Scales to 26.9kWh with six expansion batteries
The catch
- Heavy at about 132 lbs, not a grab-and-go unit
- Lower solar input than the Delta Pro 3 (manufacturer spec)