Head-to-head test
EcoFlow DELTA Pro Ultra X vs Anker SOLIX S5000
The DELTA Pro Ultra X is the answer when the whole house, central air included, has to stay on; for any outage plan short of that, the S5000 covers the critical circuits for under a third of the money.
Full profiles: EcoFlow DELTA Pro Ultra X → · Anker SOLIX S5000 →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
Spec deltas
These are two different purchases. The DELTA Pro Ultra X is a 298.7 lb, 12,000W home system that EcoFlow positions as its top-tier whole-house backupA0; the S5000 is a 97 lb, 4,500W cabinet on wheels. The Pro Ultra X costs $5,499 more, and the question is whether you need what that buys.
What it buys is output. EcoFlow rates the base system at 12kW continuous at 120/240V, enough for every circuit including a 5-ton central ACA1; 4,500W is not. Capacity is closer than the price suggests: 12,288Wh against 5,024Wh at the base, and the S5000 grows to 30,144Wh with BP5000 packsB6.
Per unit of energy the Anker is cheaper on both measures we track: $0.50 per watt-hour against $0.65 to buy, and $0.08 against $0.19 per kWh over the rated life. Those are the numbers that should decide it, unless the central air has to run.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
continuous output
So the deciding spec is power, not storage. A house that needs more than 4,500W at the same moment, central air plus an electric range plus a big pump, needs the Pro Ultra X's 12,000W. A house that can live on critical circuits never uses what the extra $5,499 pays for.
DELTA Pro Ultra X: 12,000W continuous output, 12,288Wh baseSOLIX S5000: 4,500W rated output, 8,000W peakB14S5000 with five BP5000 packs: 30,144WhB6
Why it mattersAdd up your must-run loads in watts before you compare kWh; if they come in under 4,500W, the S5000 is the buy.
cost / lifetime kWh
The cycle rating drives it. At one cycle a day the Pro Ultra X reaches its rating in about 9.6 years against the S5000's 16.4, so for a setup shifting solar into the evening every day, the Anker is far cheaper energy. On pure standby neither spends many cycles, and the comparison falls back to purchase price, where the gap is $5,499.
DELTA Pro Ultra X: 3,500 cycles, 43,008 kWh lifetime energy, $0.19 per lifetime kWhSOLIX S5000: 6,000 cycles to 80%B12, 30,144 kWh lifetime energy, $0.08 per lifetime kWhYears at daily use: 9.6 vs 16.4
Why it mattersDaily solar cyclers and standby buyers both land on the S5000, unless they need the output.
weight
That cuts both ways. The installed system is set up once and stays put. The S5000 can do the same job from the garage, and it can also leave: to an RV on its TT-30R, a job site, or the next house if you move.
DELTA Pro Ultra X: 298.7 lb, stationary; EcoFlow quotes a quick-connect install ready in about 7 daysA4SOLIX S5000: 97 lb on wheels with a pull rod and foot pedalB11S5000 has an L14-30R 240V outlet and a TT-30R RV outletB3
Why it mattersRenters and anyone who expects to move should treat the Pro Ultra X as a fixture they'd leave behind and the S5000 as one they'd take.
The specific dimensions that decide these two units — everything else is a tie.
Runtime: Will It Power Your Gear?
Selected because: The Pro Ultra X wins the long scenarios on size alone, and the margins show what 12,288Wh buys over 5,024Wh.
continuous output
Through an eight-hour blackout the Pro Ultra X uses 16% of its battery and could repeat the night 5.3 more times; the S5000 uses 39% and has 1.6 more nights in hand. That's the size gap made visible, and for a week-long grid failure it's a real one.
The Van Life day is the only scenario the S5000 doesn't finish, falling 415Wh short of 4,685Wh, while the Pro Ultra X clears it with 5,760Wh left. Nobody is bolting a fixed home system into a van, so read that row as a capacity measure rather than a use case.
Lifetime Value
Selected because: The S5000 costs well under half as much per lifetime kWh, which matters for anyone who cycles a home battery every day.
cost / lifetime kWh
Per lifetime kWh, the S5000 costs well under half as much. The reason is the cycle rating as much as the price: 6,000 cycles to 80%B12 against 3,500.
A battery that shifts solar into the evening every day spends its cycles fast, and on that duty the Anker's pack outlasts the Pro Ultra X's by about seven years on the engine's daily-use math (16.4 against 9.6). The bigger system's advantage is how much it holds, not how long it holds up.
What the Specs Don't Tell You
Selected because: The surge gap, 45,000W against 8,000W, is the plainest sign of what loads the Pro Ultra X was built for.
rated cycles
The surge figures say what each was built for. The Pro Ultra X peaks at 45,000W, 3.8 times its continuous rating; the S5000 peaks at 8,000W, 1.8 times. Eight kilowatts of surge still starts a fridge, a sump pump or a window AC. What it won't do is start a large central AC compressor while the rest of the house is running, and that is the load the Pro Ultra X's ceiling exists for.
Both carry a 5-year warranty, so the terms don't split them.
Portability & Form Factor
Selected because: The Pro Ultra X is a fixture and the S5000 rolls on wheels, which decides who can take their backup with them.
weight
Weight here isn't about carrying. The Pro Ultra X arrives spread across several boxes and is set up once; after that it doesn't move. The S5000's 97 lb rolls on wheels with a pull rod and foot pedalB11, and its label rates it for non-habitable spaces such as a garage or basementB7.
Both end up outside the living space. Only one of them can leave the property.
Strengths & trade-offs
EcoFlow DELTA Pro Ultra X
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Substantially more expensive (+$5,499) than the SOLIX S5000.
- –Significantly heavier (+201.7 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
- –Shorter-lived battery — rated for 3,500 charge cycles vs the SOLIX S5000's 6,000, so it wears out sooner.
Anker SOLIX S5000
Strengths
- +Costs $5,499 less
- +Lighter by 201.7 lb
- +Rated for 6,000 charge cycles — much longer battery lifespan
Trade-offs
- –Weaker inverter (-7,500W) 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
SOLIX S5000
The DELTA Pro Ultra X at 298.7 lbs is not a take-along — it rolls off a truck bed if it travels at all, so this scenario belongs to the SOLIX S5000 by default — and it earns it, covering the 2,100Wh with 2,170Wh to spare. Capacity was never the DELTA Pro Ultra X's problem here; getting to a campsite was.
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
DELTA Pro Ultra X
Both survive the night. The DELTA Pro Ultra X finishes at 16% used with 8,800Wh left — 5.3 more nights like it. The SOLIX S5000 finishes at 39% with 2,625Wh, 1.6 more nights like it. If your outages tend to run past one evening, that difference is the whole argument between them.
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
A CPAP is about 40W for eight hours, so both cover the night many times over and the capacity margin is a formality. Both happen to list 30dB — two makers' own figures landing on the same number rather than a measured tie — so there is nothing in the noise column to separate them either. Buy whichever is cheaper or easier to carry.
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
DELTA Pro Ultra X
The DELTA Pro Ultra X clears the workday at 9% used, banking 9,535Wh — late work, extra calls, or a second laptop charge without arithmetic. The SOLIX S5000 at 21% also finishes, with 3,360Wh of slack for the unplanned.
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
SOLIX S5000
The DELTA Pro Ultra X at 298.7 lbs is not a take-along — it rolls off a truck bed if it travels at all, so this scenario belongs to the SOLIX S5000 by default — and it earns it, covering the 670Wh with 3,600Wh to spare. Capacity was never the DELTA Pro Ultra X's problem here; getting to a tailgate was.
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
DELTA Pro Ultra X
The SOLIX S5000 doesn't finish — 4,270Wh usable against the 4,685Wh this needs leaves it 415Wh short, about 91% of the scenario covered (its nameplate 5,024Wh actually clears this — the flat 15% conversion allowance is what tips it under). The DELTA Pro Ultra X covers it with 5,760Wh to spare.
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 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: DELTA Pro Ultra X runs 51h vs 20.8h.
$7,999 list · direct from EcoFlow
Planning for more than this? Describe your whole setup and get it sized →
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 0–696.3hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–139.3hHigh-Draw Appliances
These reveal the real limitsscale 0–10.4h¹ 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
October 9, 2026
Verdict: the Anker SOLIX S5000
Buy the S5000 unless you need more than 4,500W at once. The Pro Ultra X costs $5,499 more, more per watt-hour and more than twice as much per lifetime kWh, and in exchange gives you an inverter EcoFlow sizes for every circuit in the house, central AC includedA1. If your outage plan is the fridge, the furnace fan, the well pump and the lights, the S5000's 4,500W split-phase output covers it, rolls on wheels, and needs no installation project. Confidence is capped because the S5000 has no independent testing yetB0.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of October 9, 2026. The links below open EcoFlow's and Anker's current prices.
$2,499.99 · direct from Anker
or check the DELTA Pro Ultra X price$7,999.00 list
Written by Gunner Gustafson, Whole-Home Backup Tester · Station Arena Test Desk · Updated October 9, 2026
Black Friday · 45 days out
Price to beat:DELTA Pro Ultra X $7,999
We have never seen it discounted, so any real cut would be a first.
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): Solar Generator.
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 Ultra X rates 4.3/5 (61st percentile of 29 Whole-Home / Off-Grid-class units), and SOLIX S5000 rates 4.6/5 (74th percentile of 20 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.
Weight Reality Check
Neither unit is grab-and-go. The SOLIX S5000 (97 lbs) is manageable solo but heavier than a large checked suitcase. The DELTA Pro Ultra X (298.7 lbs) is spread across its boxes — no single lift, but nothing you reposition on a whim. That's a 202 lb difference, and it is paid once — getting the heavier one into position, not every time you move it.
Surge Power: Inverter Quality Indicator
The DELTA Pro Ultra X has a 3.8× surge-to-continuous ratio vs the SOLIX S5000's 1.8×, and the higher absolute ceiling with it — 45,000W against 8,000W. At 3.8× it clears the 2× rule of thumb for absorbing motor startups — fridges, AC compressors and power tools briefly draw 2-3× their rated wattage. What decides whether a given motor starts is the ceiling, not the ratio: the SOLIX S5000 still surges to 8,000W, so check the startup draw of the heaviest thing you plan to run against that figure rather than assuming it trips.
Warranty: No Difference
Both units carry the same 5-year warranty, so coverage isn't a tiebreaker here. Worth saying because the per-dollar framing can suggest otherwise: the SOLIX S5000 works out at 2 years of cover per $1,000 spent against the DELTA Pro Ultra X's 0.6, but that spread is the price gap, not the terms.
Battery Lifespan in Real Years
The SOLIX S5000 is rated for 6,000 cycles vs 3,500. In real life: at daily use, that's 16.4 vs 9.6 years. At weekend use (twice a week), it's 58 vs 34 years. One caution reading years across different sizes: a cycle is 5,024Wh on the SOLIX S5000 and 12,288Wh on the DELTA Pro Ultra X, so count lifetime energy — roughly 30,144 kWh against 43,008 kWh over the rated life. After hitting the cycle limit, the battery doesn't die — it drops to ~80% of original capacity, which is still very usable.
Full record above — the Test Desk pick is the SOLIX S5000.
Check SOLIX S5000 price →or check the DELTA Pro Ultra X 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
The SOLIX S5000 wins on both sticker price and long-term value. At $0.08/kWh over its lifetime, it's meaningfully cheaper to own. Clear value winner. One caution on the lifespan row: the SOLIX S5000 takes longer to reach its cycle rating, but a cycle moves a different amount of energy on each unit — the DELTA Pro Ultra X still delivers more over its shorter horizon (43,008 vs 30,144 kWh). Years measure wear, not usefulness.
Delivers each lifetime kWh for $0.11 less — check the SOLIX S5000 price →
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
Fastest-charging technology (X-Stream), deepest product ecosystem, and most active innovation cadence. At the top of the range sit two whole-home paths: the TITAN line, one 5 kWh unit that grows to 30 kWh, and the DELTA Pro Ultra platform, which stacks batteries and inverters further — flagship paths, not line-wide features.
Worth knowing
Tested subscription paywalls for advanced app features in early 2025 before community backlash paused the plan. No parts or service offered out of warranty.
Anker
Ecosystem
7-8 SOLIX portable power stations across C-series (compact) and F-series (flagship), plus the X1 home energy system
Support
US-based support. Historically known for incredible no-hassle replacements, but recent reports describe AI-driven support agents giving generic responses and complex return logistics for heavy units (hazmat shipping). The Anker brand reputation is still strong, but SOLIX-specific support quality is trending down.
Community
Moderate — active Reddit (r/Anker, r/AnkerSOLIXCommunity) and growing. Benefits from Anker's massive consumer electronics brand awareness.
App experience
Rated 4.5/5 iOS (~1,100 ratings) · 4.3/5 Android
Unique strength
Anker's case here is longevity and certification: a 6,000-cycle rating to 80% and UL 9540 and 9540A listings on the S5000.
Worth knowing
Anker's home-energy lineup is narrower than EcoFlow's and its expansion ecosystem smaller. Support reports for the SOLIX line have slipped from the brand's old easy-replacement reputation.
Analyst note
EcoFlow's whole-home platform is the deeper system, with more ways to scale; Anker's S5000 is the simpler one. Pick the brand by the size of the job, not the logo.
Growth path
DELTA Pro Ultra X
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 12,288Wh.
Accepts up to 10,000W of solar. Enough for a serious multi-panel array.
Adequate ports for most setups, but heavy users may want a power strip.
Expansion batteries are EcoFlow-specific. You're investing in the EcoFlow ecosystem.
SOLIX S5000
EXPANDABLESupports Anker expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 5,024Wh.
Accepts up to 3,000W of solar. Enough for a serious multi-panel array.
Adequate ports for most setups, but heavy users may want a power strip.
Expansion batteries are Anker-specific. You're investing in the Anker ecosystem.
Realistic full solar rechargeat 70% of rated panel output — see methodology
Analyst note
Both expand, but the DELTA Pro Ultra X's higher solar ceiling (10,000W vs 3,000W) gives it the stronger off-grid growth path — more panels can feed a bigger bank as it grows.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA Pro Ultra X
The Pro Ultra X ledger is thin and leans on EcoFlow's own material and installer and review-site write-ups rather than people who've lived with oneA0A1. What it establishes is the system's scale: 12kW continuous at 120/240V with surge to 45kWA1, LFP storage expandable well past the base packA2, solar charging up to 10kWA3, and a quick-connect install EcoFlow says is ready in about 7 daysA4. Treat those as the maker's claims until long-term reports exist.
“Base config delivers 12kW continuous at 120/240V — enough to power every circuit including a 5-ton AC — scaling to 12-36kW with surge handling to 45kW via Adaptive Start.”
Sources
ecoflow.com · outboundpower.com · bobvila.com · thesolarlab.com
Anker SOLIX S5000
The S5000 has no field reports; what we know is Anker's documentationB0. It establishes the 4,500W split-phase rating and 8,000W peakB2B14, UL 9540 and UL 9540A certificationB19, a rating for non-habitable spacesB7, and Anker's internal idle-draw figures of 8.8W on 120V and 13.7W on 240VB16.
“5,024 Wh LiFePO4 pack rated 16 V, 314 Ah; the cell code IFpP72/175/208[5S] reads as five large prismatic cells in series.”
Sources
ankersolix.com
Sources & Research Notes
Every owner claim in this report is traceable to a published source. The bracketed references above resolve here.
Recurring owner themes
- Whole-home 12kW output, massive scalability (to 184kWh), EV-grade LFP, 10kW solar, and fast install are the standout features. [DELTA Pro Ultra X · 3 entries]
- No owner or reviewer reports exist yet: every entry is Anker documentation (rating label, product page, launch announcement), plus one of our own readings of the app and label drawing. [SOLIX S5000 · 20 entries]
- A1
“Base config delivers 12kW continuous at 120/240V — enough to power every circuit including a 5-ton AC — scaling to 12-36kW with surge handling to 45kW via Adaptive Start.”
ecoflow.com / outboundpower.com — DELTA Pro Ultra X review · 2026 · [positive]
- A2
“Base 12.288kWh of LFP storage (6,144Wh x 2), expandable to 61.44kWh with one inverter and up to 184.32kWh with three inverters and thirty batteries.”
ecoflow.com / outboundpower.com — DELTA Pro Ultra X · 2026 · [positive]
- A3
“EV-grade full-tab LFP cells with a multi-layer safety architecture and 24/7 BMS oversight; solar charging up to 10kW.”
ecoflow.com / bobvila.com — DELTA Pro Ultra X review · 2026 · [positive]
- A4
“A quick-connect design cuts installation time and cost by up to 80%, ready in about 7 days; a CES 2026 Innovation Award Honoree at a $7,999 base price.”
ecoflow.com / thesolarlab.com — DELTA Pro Ultra X review · 2026 · [positive]
- B2
“AC output 4,500 W max, either at 120 V (37.5 A across the outlets) or at 120/240 V split-phase (18.75 A).”
Anker rating label, model AS510 (certified 2026-09-15) · 2026-09-15 · [positive]
- B3
“Outlets: one L14-30R carrying 240 V split-phase at up to 4,500 W; one TT-30R RV outlet at 120 V, 30 A, 3,600 W; NEMA 5-20R household outlets at 120 V, 20 A, 2,400 W; USB-C 100 W, USB-C 15 W and USB-A 12 W.”
Anker rating label, model AS510 (certified 2026-09-15) · 2026-09-15 · [positive]
- B6
“Expands with up to five BP5000 expansion batteries (model AS5101A1-85), each 5,024 Wh, for 30,144 Wh in total. They join through a 400 V DC port rated 9,000 W in and 7,500 W out; each battery charges at up to 3,200 W and discharges at up to 3,000 W.”
Anker rating label, model AS510 (certified 2026-09-15) · 2026-09-15 · [positive]
- B7
“Rated for residential non-habitable spaces; holding more than 1 kWh, it belongs outside sleeping rooms and other living spaces.”
Anker rating label, model AS510 (certified 2026-09-15) · 2026-09-15 · [mixed]
- B11
“Net weight 97 lb; 10.6 × 22.0 × 15.2 in (W × D × H), on wheels with a pull rod and foot pedal.”
Anker SOLIX S5000 product page, ankersolix.com/s5000 (published 2026-10-09) · 2026-10-09 · [positive]
- B12
“Cycle life: 6,000 cycles to 80% capacity, 10,000 cycles to 60%; Anker estimates a 15-year lifespan at 1 to 2 cycles a day, with 5 years of product coverage.”
Anker SOLIX S5000 product page, ankersolix.com/s5000 (published 2026-10-09) · 2026-10-09 · [positive]
- B14
“4,500 W rated, 8,000 W peak AC output; bypass mode passes up to 4,500 W.”
Anker SOLIX S5000 product page, ankersolix.com/s5000 (published 2026-10-09) · 2026-10-09 · [positive]
- B16
“Idle draw 8.8 W on 120 V output and 13.7 W on 240 V output (Anker internal testing).”
Anker SOLIX S5000 product page, ankersolix.com/s5000 (published 2026-10-09) · 2026-10-09 · [positive]
- B19
“UL 9540 and UL 9540A certified.”
Anker SOLIX S5000 product page, ankersolix.com/s5000 (published 2026-10-09) · 2026-10-09 · [positive]
Research compiled October 9, 2026.
Who Should Buy Which
Buy the DELTA Pro Ultra X if you…
- →You want the whole panel backed up, central air and electric appliances included, and you're ready for an installed system.
- →Your house draws more than 4,500W at once in normal use and you can't shed those loads during an outage.
- →You're planning a very large solar array; the Pro Ultra X takes 10,000W of solar input, more than three times the S5000's 3,000W.
Buy the SOLIX S5000 if you…
- →You want the fridge, the furnace fan, the well pump and the lights through an outage, fed through a generator inlet, without an installation project.
- →You rent or expect to move, and want backup that rolls out the door with you.
- →You'll cycle the battery daily from solar and care what each kWh costs over the years.
If neither fits
If your outages are rare and last an evening, a 5,024Wh cabinet and a 12,288Wh home system are both far more than you need; a portable station a fraction of the S5000's size keeps a fridge and lights going for a night. If you need whole-home power for days on end, price a standby generator alongside the Pro Ultra X.
The Bottom Line
The Pro Ultra X is the bigger machine and you pay for every watt of it. If the central air has to run through an outage, nothing else on this page replaces it.
Everyone else should take the S5000: cheaper per watt-hour, cheaper per lifetime kWh, and a cabinet that rolls instead of a fixture that stays. Spend part of the difference on panels.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Can the Anker SOLIX S5000 run central air?
Not alongside the rest of a house. Its continuous rating is 4,500W with an 8,000W peak, which handles critical circuits but leaves little room for a large central AC compressor. EcoFlow sizes the Pro Ultra X's 12,000W for exactly that load.
Is the EcoFlow DELTA Pro Ultra X worth the extra over the SOLIX S5000?
Only if you need its output. It costs $5,499 more, more per watt-hour and more than twice as much per lifetime kWh; what you get is 12,000W against 4,500W and a much larger base battery. For critical-circuit backup, the S5000 does the job for under a third of the price.
Can the S5000 be expanded to match the DELTA Pro Ultra X?
In capacity, yes: five BP5000 packs take it to 30,144Wh, more than the Pro Ultra X's 12,288Wh base. In output, no; the inverter stays at 4,500W however many packs you add.
Which battery lasts longer, the DELTA Pro Ultra X or the S5000?
The S5000 is rated for 6,000 cycles to 80% against the Pro Ultra X's 3,500. At one cycle a day that's about 16.4 years against 9.6, though the Pro Ultra X's larger pack still delivers more total energy over its rated life.
Where to buy
EcoFlow DELTA Pro Ultra X
$7,999.00
$7,999.00 · direct from EcoFlow
Last checked 28 days ago. Prices move — check before you buy.
Anker SOLIX S5000Pick
$2,499.99
$2,499.99 · direct from Anker
Prices may vary by retailer and are subject to change.