EcoFlow DELTA Pro 3 vs Anker SOLIX F3800: Which Flagship Wins? (2026)

The EcoFlow DELTA Pro 3 and the Anker SOLIX F3800 are the two flagship power stations everyone compares, and they’re close enough that the wrong choice is easy to make. Both are 4kWh-class LiFePO4 units aimed at serious home backup, both cost in the ~$3,000–3,700 range, and both advertise whole-home capability.

But they’re built for different jobs. The honest short version: the F3800 wins if you need 240V power or maximum expansion; the Pro 3 wins on solar speed, UPS performance, app polish, and usually price. Below is the full breakdown so you can match the winner to your actual loads.

The verdict, up front

Buy the Anker SOLIX F3800 if: you need 240V split-phase from a single unit (well pump, EV charger, 240V appliances, big workshop tools), or you want the biggest possible battery bank — up to 26.9kWh with expansion batteries.

Buy the EcoFlow DELTA Pro 3 if: your loads are 120V, you want the fastest solar recharge in the class, you need a true 10ms UPS for computers and servers, or you want the best per-kWh value on sale.

Read our full reviews: DELTA Pro 3 review · SOLIX F3800 review

Spec table

Output power: the single biggest difference

This is where the F3800 justifies its existence. Its 6,000W continuous inverter with native 240V split-phase output means one box can drive a 240V load — a well pump, an EVSE, a 240V water heater, a large table saw — no pairing, no panel, no second purchase. The outlets to back it up are there too: an NEMA 14-50 and an L14-30, both rated to the full output.

The DELTA Pro 3’s inverter is a 4,000W 120V unit (6,000W in X-Boost mode, which relaxes voltage regulation to muscle through heating loads — handy, but not true split-phase). It can do 240V, but only when you buy a second Pro 3 and run the pair through EcoFlow’s Smart Home Panel 2. That’s a legitimate whole-home solution, but it roughly doubles your cost versus just buying an F3800.

One nuance worth knowing: a single-unit ceiling of 12,000W exists on both ecosystems when fully paired. And for plain 120V backup — fridge, freezer, lights, router, microwave, even a sump pump — the Pro 3’s 4,000W handles everything a typical outage throws at you. See our home backup outage scenarios to sanity-check which loads you’d actually run at once.

Winner: F3800 — for anyone with 240V loads. For 120V-only households, the gap barely matters.

Capacity and expandability: EcoFlow leads the base, Anker leads the ceiling

At the base-unit level, the Pro 3 gives you more for the money: 4,096Wh vs 3,840Wh — about 7% more stored energy out of the box. That translates directly to longer runtimes: a fridge drawing ~150W averages about 23 hours on the Pro 3 versus ~22 on the F3800 (our fridge sizing guide walks through the math).

The story flips hard when you expand. The F3800 accepts up to six BP3800 expansion batteries for a total of 26.9kWh — that’s multiple days of whole-house runtime, genuinely off-grid territory. The Pro 3’s Smart Extra Batteries top out around 12kWh. If your plan is “buy a small system now, grow it into a whole-home battery bank,” Anker’s ceiling is more than double.

Also worth noting: the Pro 3’s LiFePO4 cells are rated for roughly 4,000 cycles to 80% versus ~3,000 for the F3800. Over a decade of daily cycling, that’s the difference between keeping usable capacity longer — a real, if slow-motion, advantage for the EcoFlow.

Winner: tie. Pro 3 for base capacity and cycle life; F3800 for expansion ceiling.

Solar charging: EcoFlow’s quiet superpower

The DELTA Pro 3 accepts 2,600W of solar input (1,600W on the high-PV port plus 1,000W on the low-PV port) against the F3800’s 2,400W. In full sun that’s the difference between a full recharge in roughly 1.6 hours versus ~1.7–1.8 — not dramatic per charge, but across a week-long outage the Pro 3 keeps ahead of your consumption more easily.

More importantly, EcoFlow pairs this with much faster wall charging: up to 3,600W on 240V AC, versus 1,800W for the Anker. If you recharge from a generator or the grid between outage windows, the Pro 3 tops up in about an hour and a quarter from empty.

But the F3800 has a real advantage of its own: dual 1,200W MPPT inputs make it dead simple to run two independent panel arrays, and Anker’s Home Power Panel ties the unit directly into home circuits with solar. For planning your array, our solar panel pairing guide covers sizing panels to either unit, and the /tools/solar-pairing/ tool runs the numbers.

Winner: Pro 3 — faster on both solar and wall.

Portability, app, and ecosystem

Neither unit is portable in any meaningful sense — 113.5 lb (Pro 3) and 132 lb (F3800) — but the Pro 3’s ~19 lb advantage is noticeable on stairs, and its slimmer profile (27.3 × 13.4 × 16.1 in) fits in more vehicle cargo areas. Both ship with wheels and telescoping handles.

On software, EcoFlow’s app is the more polished of the two: finer charge/discharge scheduling, more granular smart-home-panel integration, and broader third-party ecosystem (extra batteries, the Dual Fuel generator, the Alternator Charger). Anker’s app covers the essentials well — remote monitoring, scheduled charging, firmware updates — but EcoFlow’s ecosystem is deeper if you plan to keep adding components.

UPS behavior is a genuine differentiator: the Pro 3 switches in 10ms, fast enough to keep desktop computers, NAS drives, and routers online without a blip. The F3800’s 20ms is fine for fridges and lights but can cause sensitive electronics to restart. If you’re buying partly as a UPS for a home office, this decides it.

Winner: Pro 3 — lighter, better app, true 10ms UPS.

Price and value

Both flagships street in the ~$3,000–3,700 range (check current prices — both brands discount aggressively during sales events). The Pro 3 usually wins on effective value for three reasons: it ships with more base capacity, it goes on sale deeper, and its higher cycle life means the battery holds up longer.

The value math changes if you need 240V. A single F3800 delivering native split-phase is cheaper than two Pro 3s plus a Smart Home Panel 2. Price the system you’ll actually build, not the single unit.

For the rest of Anker’s lineup, the SOLIX F3000 review covers the mid-tier option that skips the split-phase output at a much lower price.

Who should buy which

Get the Anker SOLIX F3800 if:

• You have 240V loads (well pump, EV charger, water heater, shop tools)
• You want to expand past 12kWh toward a whole-home battery bank
• You want Anker’s Home Power Panel for circuit-level integration
• You’re pairing with the biggest possible solar array across two MPPT inputs

Get the EcoFlow DELTA Pro 3 if:

• All your loads are 120V (the vast majority of outage backup)
• You need a true 10ms UPS for computers or servers
• Solar recharge speed is your priority
• You want the best per-kWh value on sale and longer cycle life
• You prefer EcoFlow’s deeper accessory ecosystem

For broader brand context — warranties, app quality, where each brand wins across the lineup — read EcoFlow vs Anker vs Jackery. And if a 4kWh flagship is more than you need, our fridge runtime guide shows how far the smaller 1–2kWh units go for the single most common backup load.