Head-to-head test
EcoFlow DELTA Pro vs BLUETTI Elite 400
The pricing flipped: the Elite 400 is now $200 cheaper than the DELTA Pro, not $300 more — and it was already the quieter (30dB vs 60), lighter, larger-capacity unit. The DELTA Pro answers with 1,000W more continuous output, nearly double the surge, and an expansion path. For most buyers, the cheaper, quieter Elite 400 is now the better home unit; the DELTA Pro is the pick when you need its raw power or growth.
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
EcoFlow
DELTA Pro
5,338Power Score · The AC & Fridge Zone
$1,599.00 list · direct from EcoFlow
BLUETTI
Elite 400
5,086Power Score · The AC & Fridge Zone
$1,399.00 list · direct from BLUETTI
Spec deltas
The pricing on these two has crossed over. The BLUETTI Elite 400 is now $1,399; the EcoFlow DELTA Pro has risen to $1,599 — so the Elite 400 is $200 cheaper, where it used to cost $300 more. And it still holds 240Wh more capacity (3,840 vs 3,600Wh).
The lifetime math flipped with it: about $0.12 per kWh for the Elite 400 against $0.13 for the DELTA Pro, where the Pro used to be well ahead. The Elite 400 is also the quieter and lighter box — 30dB against a rated 60, and 14 lbs less to carry.
The DELTA Pro's case is now power and flexibility, not price. It runs 1,000W more continuous output (3,600W vs 2,600W), surges to more than double the Elite 400's ceiling (7,200W vs 3,900W), refills from solar faster, and can take an expansion battery the sealed Elite 400 can't. That's a real counter — but you now pay $200 more, and 30 extra decibels under load, for it.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
continuous output
Fridge and AC compressors draw 2-3x their rated wattage for a fraction of a second at startup. With nearly double the surge headroom, the DELTA Pro has far more room to absorb that spike before it refuses to start the load at all — that's what its $200 premium now buys.
The DELTA Pro runs 3,600W continuous for $1,599; the Elite 400 runs 2,600W continuous for $1,399The DELTA Pro surges to 7,200W against the Elite 400's 3,900W
Why it mattersAnyone planning to run a fridge, a window AC, or power tools should weigh the DELTA Pro's surge gap against the Elite 400's lower price and extra 240Wh of capacity.
solar input
An outage doesn't schedule itself, and panels rarely deliver full rated wattage, so real refill times run longer than either number. But the gap between them holds: the DELTA Pro finishes its solar day with real time to spare while the Elite 400 is still catching sun.
The DELTA Pro accepts up to 1,600W of solar against its 3,600Wh capacityThe Elite 400 accepts up to 1,000W of solar against its 3,840Wh capacity
Why it mattersBuyers relying on one sunny window a day during a multi-day outage should weight faster refill over the Elite 400's slightly larger tank.
cost / lifetime kWh
Both units carry the identical 5-year warranty term, and the DELTA Pro's 500 extra cycles used to make it cheaper per kWh; but at the new prices the Elite 400's $200 lower sticker wins the lifetime math too, landing at about $0.12 per kWh against the Pro's $0.13, and $280 a warranty year against $320.
The DELTA Pro is rated for 3,500 cycles against the Elite 400's 3,000The Elite 400 costs $0.12 per lifetime kWh against the DELTA Pro's $0.13
Why it mattersAnyone optimizing for total cost of ownership now leans to the Elite 400, not away from it.
weight
Owners report the DELTA Pro-line's fans carry a noticeable high-pitched whine above roughly 2,000W of drawA4 — audible in a way the Elite 400's 30dB rating isn't, and worse if the unit is running near your bedroom overnight.
The DELTA Pro is rated at 60dB under load against the Elite 400's 30dBThe DELTA Pro weighs 99 lbs against the Elite 400's 85 lbs
Why it mattersAnyone running heavy loads near a sleeping space, or relying on it for CPAP overnight, has another reason to take the quieter — and now cheaper — Elite 400.
The specific dimensions that decide these two units — everything else is a tie.
Lifetime Value
Selected because: The per-kWh gap now favors the Elite 400 ($0.12 vs $0.13), and its $200 lower price reshapes the verdict.
cost / lifetime kWh
Twelve cents a kilowatt-hour against thirteen — the ownership math has turned over. The Elite 400's $200 lower price now outweighs the DELTA Pro's 500 extra cycles, so it's the cheaper unit both today and across its life, where the Pro used to lead on both.
Both carry the same five-year warranty, but that identical coverage now works out to $280 a year on the Elite 400 against $320 on the DELTA Pro — the same promise, delivered cheaper every year you own it, by the Elite this time.
PowerScore Breakdown
Selected because: The composite score reflects the across-the-board output and surge advantage the individual specs already show.
overall power score
The DELTA Pro's composite score of 5,483 still beats the Elite 400's 4,867 by more than 600 points, and it isn't one spec carrying the gap — continuous output and surge headroom both point its way. That raw-power lead is real and unchanged by the price move.
What the price move does change is the value read around it: the Elite 400's extra 240Wh of capacity, its quieter fan, and now its lower price mean the Pro wins the power score while the Elite wins the wallet. Which matters more depends on whether you're buying muscle or a quiet home unit.
Growth Path
Selected because: Expansion is a genuine long-term DELTA Pro advantage and deserves its own treatment.
solar input
The DELTA Pro can take an EcoFlow expansion battery later without replacing the base unit; the Elite 400 is a closed system, and 3,840Wh is the ceiling for as long as you own it.
That only matters if your power needs are actually likely to grow — more gear, longer trips, a future partial home-backup setup. If you're sizing to a known need today, the Elite 400 already ships close in capacity and this advantage goes unused.
What the Specs Don't Tell You
Selected because: Noise, weight, and surge ratio all fire and carry the honest tradeoff at the center of this matchup.
rated cycles
The DELTA Pro's 7,200W surge rating very nearly doubles the Elite 400's 3,900W — on identical logic, that's the difference between confidently starting a compressor load and risking a stall on the exact spike these units are bought to handle.
The cost of that power now runs the other way on price: the DELTA Pro is rated at 60dB under heavy draw against the Elite 400's 30dB, it's 14 lbs heavier at 99 lbs, and it's $200 more. It's the reliable choice for a garage, a job site, or an outage where you need the surge — and the louder, pricier one to have running in a quiet house overnight.
Strengths & trade-offs
EcoFlow DELTA Pro
Strengths
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Significantly heavier (+14 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
- –Can receive complaints about fan noise under heavy load.
BLUETTI Elite 400
Strengths
- +Costs $200 less
- +Lighter by 14 lb
- +Larger battery capacity
Trade-offs
- –Weaker inverter (-1,000W) limits appliance compatibility.
- –Very heavy unit that may be difficult for one person to lift.
Will It Power Your Gear?
Scenario math and per-appliance runtimes, modeled from the spec record.
Scenario verdicts
We ran the math on six real-world scenarios. Here's which unit survives your actual life.
SCN-01 · 2 nights · needs 2,100Wh
Weekend Camping
Two nights off-grid with essential comfort
Either unit
Both comfortably cover a two-night trip — the DELTA Pro finishes at 69% of its tank, the Elite 400 at 64%. Neither breaks a sweat here; the price and noise gap upstream of this scenario matter more than a five-point capacity cushion.
Battery budget usedlower = more headroom
LOAD Phone Charger 15W×6h · LED Lights 40W×8h · Box Fan 75W×14h · CPAP Machine 40W×16h
SCN-02 · 8 hours · needs 1,645Wh
8-Hour Blackout
Keep the essentials running through a night without power
Either unit
Both survive the blackout with similar margin. Since the capacity difference doesn't matter here, focus on which unit has UPS mode — seamless switchover protects your router and PC from the split-second power gap.
Battery budget usedlower = more headroom
LOAD Fridge 150W×8h · Router + Modem 20W×8h · LED Lights (4 bulbs) 40W×6h · Phone Charger 15W×3h
SCN-03 · 8 hours · needs 320Wh
CPAP Overnight
Sleep therapy without interruption — the #1 medical use case
Either unit
Both are wildly overqualified for CPAP. You're using 10% or less. Save your money and buy whichever is cheaper; the extra capacity is completely wasted on a 40W overnight load. Put the savings toward a second battery for multi-night trips.
Battery budget usedlower = more headroom
LOAD CPAP Machine 40W×8h
SCN-04 · 8 hours · needs 910Wh
Remote Workday
Full work day off-grid without power anxiety
Either unit
Both power your workstation all day without breaking a sweat. At these utilization levels, prioritize the unit with better USB-C output for direct laptop charging. It's more convenient than using the AC inverter and wastes less energy.
Battery budget usedlower = more headroom
LOAD Laptop 60W×8h · External Monitor 30W×8h · Router + Modem 20W×8h · Phone Charger 15W×2h
SCN-05 · 4 hours · needs 670Wh
Tailgate Party
Game day power for the crew
Either unit
Both handle game day easily. Since capacity isn't the deciding factor, consider weight: the lighter unit is easier to load into a truck bed. Also check if either has Bluetooth speaker-level noise. Fan sound matters in social settings.
Battery budget usedlower = more headroom
LOAD Blender 400W×0.5h · LED TV (55") 80W×4h · Bluetooth Speaker 15W×4h · Phone Charger (×3) 45W×2h
SCN-06 · 24 hours · needs 4,685Wh
Van Life Daily
A full day of mobile living — the ultimate endurance test
Neither unit
Neither is sized for full daily van life — the DELTA Pro needs 153% of its capacity, the Elite 400 needs 144%. That's not a close miss, it's a different category of unit; look at something with meaningfully more capacity if this is your daily driver.
Battery budget usedlower = more headroom
LOAD Mini-Fridge 150W×24h · Laptop 60W×4h · Phone Charger 15W×3h · LED Lights 40W×5h · Fan 75W×8h
The Load Test
RUNTIME = (Wh × 0.85) ÷ LOAD
None of the six scenarios above exactly yours? Build it. Toggle what you'd plug in; both units are tested against the combined draw.
Essentials
Comfort & Convenience
High-Draw Appliances
Test duration
8h
Continuous draw
205W
Projected runtime
For this load: Elite 400 runs 15.9h vs 14.9h.
$1,399 list · direct from BLUETTI
Modeled from the spec record — same math as the tables below. Methodology
Runtime by appliance
Real-world runtime estimates for common appliances, modeled at 85% inverter efficiency.¹
Essentials
The basics you need runningscale 0–217.6hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–43.5hHigh-Draw Appliances
These reveal the real limitsscale 0–3.3h¹ Runtime = (capacity × 0.85) ÷ appliance watts. Within each group, all bars share one time scale (the group's longest runtime), so lengths are comparable across appliances; identical runtimes collapse into a single blue/orange bar. Actual runtime varies with battery age, temperature, and simultaneous loads — see methodology.
Conclusion
July 14, 2026
Verdict: the Elite 400
For most buyers, the BLUETTI Elite 400 — the price move tips what was already a close call. It's now $200 cheaper than the DELTA Pro ($1,399 vs $1,599), and cheaper to own too now that lifetime cost has inverted to about $0.12 per kWh against the Pro's $0.13. It also holds more capacity (3,840 vs 3,600Wh), runs far quieter (30dB vs a rated 60dB with an audible whine past ~2,000WA4), and weighs 14 lbs less (85 vs 99). The DELTA Pro keeps real advantages — 3,600W continuous against 2,600W, a 7,200W surge that nearly doubles the Elite 400's 3,900W, faster solar refill, and an expansion path where the Elite is capped at 3,840Wh forever. If you'll start heavy compressor loads, need to grow the system later, or run it in a garage where noise doesn't matter, the DELTA Pro earns the premium. For a quiet home, overnight, or CPAP setup — and for most budgets — the Elite 400 is now the better buy.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of July 14, 2026. The links below open EcoFlow's and BLUETTI's current prices.
$1,399.00 list · direct from BLUETTI
or check the DELTA Pro price$1,599.00 list
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated July 14, 2026
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Full specifications
ᵈ Derived: price ÷ rated capacity. See the data behind our comparisons →
Comparison ToolAdd more power stations, side by sideOpen Tool →How these numbers are produced
Numeric verification
Every figure on this page traces to our spec database or arithmetic on it — no estimated numbers.
Owner claims
Statements about owner experience are cited to published reviews — see Sources & Research Notes below.
Runtime model
Runtime = (rated capacity × 0.85 inverter efficiency) ÷ device wattage. Solar recharge estimates assume panels deliver 70% of rated output. Cold weather, battery age, and stacked loads reduce real-world results.
Power Score
Computed from 14 published spec dimensions, weighted per use-case bench. Higher is better; a unit must meet a bench's minimum threshold to be rated.
See the full weight table and data sourcing on our methodology page →Class ranking (the star rating)
Each unit's star score is a category ranking, not customer reviews — no buyer opinions feed it. We score every station on size-independent quality (value, output, portability, endurance, ports, warranty, and more), then percentile-rank it against the other units in its capacity class, so a class-leading compact unit and a class-leading whole-home unit can both earn 5★. Here, DELTA Pro rates 3.9/5 (33rd percentile of 16 Home Backup-class units), and Elite 400 rates 3.6/5 (20th percentile of 16 Home Backup-class units).
How the class ranking is computed →Test Notes & Caveats
Hidden gotchas and advantages we spotted that you won't find on the product page.
The Trade-Off for the Extra Output
The DELTA Pro weighs 99 lbs against the Elite 400's 85 — 14 lbs is part of the price of its extra continuous output. Either way it's a two-hands, bent-knees lift out of a trunk; the DELTA Pro just asks a little more of the two hands.
60 Decibels Under Load, Against 30
The DELTA Pro is rated at 60dB under heavy draw; the Elite 400 sits at 30dB. That gap is the real cost of the DELTA Pro's stronger output — fine in a garage or outdoors, worth knowing before it runs your bedroom overnight.
One Unit Can Grow, One Can't
The DELTA Pro accepts an EcoFlow expansion battery later; the Elite 400 is a closed system at 3,840Wh for good. That only matters if your needs are actually likely to grow past what you're buying today.
7,200W Against 3,900W
The DELTA Pro's surge rating very nearly doubles the Elite 400's. Compressor startup spikes draw 2-3x their rated wattage for a fraction of a second — the wider the surge cushion, the less likely a fridge or AC trips the unit on startup.
UPS Speed: standby (<20ms) vs standby (<20ms)
The Elite 400 switches to battery in 15ms (standby (<20ms)), while the DELTA Pro takes 20ms (standby (<20ms)). Most electronics handle this fine, but sensitive server equipment may hiccup. This matters if you're using it as a home UPS for always-on equipment.
Full record above — the Test Desk pick is the Elite 400.
Check Elite 400 price →or check the DELTA Pro priceOwnership Analysis
What happens after you buy — true cost of ownership, brand trust, and growth potential.
Lifetime value
Service lifeyears at one full cycle per day
Lifetime energy delivered
Cost per delivered kWh
│ warranty ends · Reaching the cycle rating means ~80% capacity remains — degraded, not dead.
Analyst note
Both units have similar long-term ownership costs ($0.13/kWh vs $0.12/kWh). The price difference is what you see on the sticker — neither is a hidden bargain or rip-off.
Brand trust
EcoFlow
Ecosystem
Largest in portable power — 12-15 models across DELTA Pro, DELTA 3, and RIVER 3 series, plus solar panels and smart home panels
Support
US-based phone/email/chat support (1-800-368-8604). Experiences are polarized — many report hassle-free prepaid-label replacements, but others report long waits and refurbished units sent for new claims. Pro tip: buying from Costco or Amazon gives you a stronger return safety net.
Community
Largest community in the space — Reddit r/Ecoflow_community (~31K members), multiple Facebook groups, and an official community forum
App experience
Rated 4.6/5 iOS (~8,400 ratings) · 4.2/5 Android (~17,000 ratings)
Unique strength
EcoFlow runs the deepest ecosystem in the category, with the fastest charging technology (X-Stream) and the most active innovation cadence of any major brand here.
Worth knowing
The October 2025 DELTA Max 2000 recall over an overheating risk is worth knowing about, and support experiences are polarized. Buying through Costco or Amazon tends to give a stronger return safety net than buying direct.
BLUETTI
Ecosystem
One of the broadest lineups — 15-20+ models from budget (AC2A) to flagship (Apex 300, 3072Wh). Includes specialized products: vehicle solar hubs, sodium-ion cold-weather units, and balcony storage systems.
Support
The most inconsistent support in the space. Heavily email-based with China timezone delays. Some users get smooth, efficient service; others report weeks of troubleshooting runarounds, being offered discounts on new units instead of repairs, and confusing third-party purchase claim processes. Buying direct from Bluetti's website tends to produce better support outcomes.
Community
Active and growing — Reddit r/bluetti has a dedicated community. Second-largest after EcoFlow in engagement.
App experience
Rated 4.5/5 iOS and Android — tied for best app experience in the category. V3.0 UI redesign was well-received.
Unique strength
BLUETTI's lineup leads the category on capacity-to-price value, and the Elite 400 carries the fastest charging and lowest switchover time in BLUETTI's own Elite range.
Worth knowing
Support is the most inconsistent in the category — heavily email-based with China timezone delays. Buying direct from BLUETTI's own site tends to produce smoother outcomes than third-party retailers.
Analyst note
EcoFlow's ecosystem and innovation cadence run broader, but on this specific matchup the Elite 400's lower price, larger capacity, and quieter operation do the deciding — brand loyalty aside, the numbers now favor BLUETTI here.
Growth path
DELTA Pro
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 3,600Wh.
Accepts up to 1,600W of solar. Enough for a serious multi-panel array.
Generous port selection supports complex multi-device setups.
Expansion batteries are EcoFlow-specific. You're investing in the EcoFlow ecosystem.
Elite 400
FIXED CAPACITYFixed at 3,840Wh — a sealed, complete system. No expansion port, but that capacity already covers heavy and multi-day loads.
Accepts up to 1,000W of solar. Enough for a serious multi-panel array.
Adequate ports for most setups, but heavy users may want a power strip.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
Don't read the DELTA Pro's expandability as a straight win here: it starts at 3,600Wh, below the Elite 400's 3,840Wh, so a first expansion battery largely buys back capacity the Elite 400 already includes. It only pulls ahead if you'd grow past 3,840Wh — short of that, the Elite 400's larger fixed capacity is the simpler value.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA Pro
The DELTA Pro is long regarded as a gold standard for home backup — designed for high-draw appliances and full-scale battery expansion, running essentials like a fridge, lighting, and a space heater through extended outagesA1. Its LFP battery holds up over months of real use, serving as primary backup across multiple overnight outages while powering several loads at onceA3.
It's not silent about doing it. Under draws above roughly 2,000W, the fans carry a noticeable high-pitched whine that's distracting in a quiet room, though it runs quietly enough at lighter loadsA4. It's also heavy but wheeled — the integrated wheels and telescoping handle help on flat ground, but a cart is worth having for anything unevenA2.
“Long regarded as a gold standard for home backup — designed for high-draw appliances and full-scale battery expansion, running home essentials like a fridge, lighting, and a space heater through outages.”
Sources
backuppowerhub.com · us.ecoflow.co · outdoorgearlab.com · bobvila.com · powerstationadvisor.com · robbsutton.com
BLUETTI Elite 400
Reviewers call the Elite 400 one of the most complete units at the 3,000Wh+ tier in 2026 — 3,840Wh of LFP capacity, 70-minute fast charging, 15ms UPS protection, and a built-in trolley all in the same packageB2. It's BLUETTI's largest Elite-range unit, fixed at its native capacity with 2,600W continuous output and 3,900W of Power Lifting surgeB1.
The compromises reviewers flag are real: only two AC sockets and no battery expansion on a unit that's otherwise hard to faultB4. It's also a hefty ~86 lbs, though reviewers note it's lighter than some competitors and ships with wheels and a trolley for mobilityB3.
“BLUETTI's largest Elite-range unit — a 3,840Wh LiFePO4 battery with 2,600W continuous output (3,900W Power Lifting), fixed at native capacity with no expansion.”
Sources
techradar.com · amazon.com · backuppowerhub.com · cleantechnica.com · notebookcheck.net · thesolarlab.com · edinburghnews.scotsman.co
Sources & Research Notes
Every owner claim in this report is traceable to a published source. The bracketed references above resolve here.
Recurring owner themes
- Established home-backup platform with wheeled portability and massive expandability; the consistent knock is fan noise under heavy load. [DELTA Pro · 3 entries]
- Large 3,840Wh LFP capacity, fast charging, 15ms UPS, and a trolley are the praise; only two AC sockets, no expansion, and heavy weight are the caveats. [Elite 400 · 2 entries]
- A1
“Long regarded as a gold standard for home backup — designed for high-draw appliances and full-scale battery expansion, running home essentials like a fridge, lighting, and a space heater through outages.”
backuppowerhub.com / us.ecoflow.com — EcoFlow DELTA Pro review · 2025-2026 · [positive]
- A2
“Heavy but wheeled — integrated wheels and a telescoping handle help move its considerable weight, though they work best on flat, smooth surfaces; a cart is needed for uneven ground.”
outdoorgearlab.com / bobvila.com — DELTA Pro-line review · 2025-2026 · [mixed]
- A3
“Reliable through extended outage use — served as primary backup across multiple overnight outages over months, powering essentials simultaneously; LFP battery rated for thousands of cycles and 10+ years of daily use.”
powerstationadvisor.com / robbsutton.com — DELTA Pro-line review · 2025-2026 · [positive]
- A4
“Not silent under heavy load — under 2000W-plus draws the fans emit a noticeable high-pitched whine that's distracting in a quiet room, though it runs quietly enough at lighter loads.”
outdoorgearlab.com — DELTA Pro-line noise testing · 2025-2026 · [negative]
- B1
“BLUETTI's largest Elite-range unit — a 3,840Wh LiFePO4 battery with 2,600W continuous output (3,900W Power Lifting), fixed at native capacity with no expansion.”
techradar.com / amazon.com — Elite 400 review · 2026 · [mixed]
- B2
“Combines 3,840Wh LFP capacity, 3,900W surge, 70-minute fast charging, 15ms UPS protection, and a built-in trolley system — one of the most complete units at the 3,000Wh+ tier in 2026.”
backuppowerhub.com / cleantechnica.com — Elite 400 review · 2026 · [positive]
- B3
“A hefty ~86 lbs (39 kg), though reviewers note it's lighter than some competitors, with wheels and a trolley for mobility.”
notebookcheck.net / thesolarlab.com — Elite 400 review · 2026 · [mixed]
- B4
“Powerful, but reviewers flag only two AC sockets and no battery expansion as compromises — good but not quite as good as it could have been.”
techradar.com / edinburghnews.scotsman.com — Elite 400 review · 2026 · [mixed]
Research compiled July 14, 2026.
Who Should Buy Which
Buy the DELTA Pro if you…
- →You're running a fridge, power tools, or other compressor-driven loads and want the wider surge cushion (7,200W vs 3,900W) and 1,000W more continuous output — and you'll pay $200 more for it.
- →You want a growth path — the ability to add capacity later — or the faster solar refill, neither of which the sealed Elite 400 offers.
Buy the Elite 400 if you…
- →You want to save $200 up front ($1,399 vs $1,599) on the quieter (30dB vs 60), lighter unit — and the lower cost to own ($0.12 vs $0.13 per lifetime kWh).
- →You're running this near a bedroom, nursery, or CPAP overnight, or you just want the larger native 3,840Wh capacity with no plans to expand.
If neither fits
If your real need is daily van-life power, around 4,685Wh a day, skip both — the DELTA Pro needs 153% of its tank and the Elite 400 needs 144%. Neither is sized for full daily-cycle use; look at a larger-capacity station built for that job.
The Bottom Line
The page has flipped. The Elite 400 is now $200 cheaper ($1,399 vs $1,599), holds more capacity, runs far quieter (30dB against 60), weighs less, and costs less to own — a clean sweep of the everyday reasons to buy.
The DELTA Pro still wins on raw power: 1,000W more continuous output, nearly double the surge, faster solar refill, and a growth path the sealed Elite 400 doesn't have. If you need that muscle or expansion and don't mind the noise, weight, and $200 premium, it's worth it. Otherwise — especially for a quiet home — the Elite 400 is now the better buy.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the DELTA Pro or the Elite 400 cheaper to own?
The Elite 400 now, on both counts. It's $200 cheaper upfront ($1,399 vs $1,599), and its lower price now outweighs the DELTA Pro's 500 extra cycles, landing at about $0.12 per lifetime kWh against $0.13. The same 5-year warranty costs $280 a year on the Elite 400 against $320 on the DELTA Pro. The DELTA Pro used to win this; the price swing reversed it.
How loud is the DELTA Pro really?
It's rated at 60dB under heavy load, and owners report a noticeable high-pitched whine above roughly 2,000W of draw. The Elite 400 is spec'd at 30dB. If this is running near where you sleep, that gap is worth taking seriously.
Which one is better for backing up a fridge or AC?
The DELTA Pro. It surges to 7,200W against the Elite 400's 3,900W, on 1,000W more continuous output. Compressor startup spikes 2-3x their rated draw, and the wider surge cushion is what determines whether that spike gets absorbed or trips the unit.
Is the DELTA Pro's expansion battery worth it?
Only if you have a concrete plan to eventually need more than 3,600Wh. The Elite 400 already ships with 3,840Wh and can't be expanded at all, so if your needs are fixed, the DELTA Pro's expansion path goes unused.
Which recharges faster from solar?
The DELTA Pro. It accepts up to 1,600W of solar input against the Elite 400's 1,000W, which at full-rated input works out to roughly 2.25 hours to refill against the Elite 400's roughly 3.84 hours — a real difference if you're relying on one sunny window a day during an outage.
Where to buy
EcoFlow DELTA Pro
$1,599.00
$1,599.00 list · direct from EcoFlow
BLUETTI Elite 400Pick
$1,399.00
$1,399.00 list · direct from BLUETTI
Prices may vary by retailer and are subject to change.