Head-to-head test
EcoFlow DELTA Pro Ultra + 1 Battery vs Anker SOLIX S5000
Watt-hour for watt-hour they cost the same, so the real choice is whether to buy 12,288Wh and 7,200W today or 5,024Wh on wheels with room to grow.
Full profiles: EcoFlow DELTA Pro Ultra + 1 Battery → · Anker SOLIX S5000 →
Written by Gunner GustafsonUpdated
Whole-Home Backup Tester, Station Arena Test Desk
Spec deltas
Divide each price by its battery and the two land within a cent per watt-hour of each other. So this isn't cheap against expensive. It's 12,288Wh and 7,200W bought all at once, in an inverter-and-battery stack that weighs 293.6 lb, against 5,024Wh and 4,500W in one 97 lb cabinet with wheels and a pull rod.
The S5000 takes it, at moderate confidence. Its 6,000-cycle rating against the EcoFlow's 4,000 pulls its cost per lifetime kilowatt-hour down to $0.08 against $0.12, and it grows by up to five BP5000 packs to 30,144Wh, so you pay for capacity once you've proven you need itB6.
The EcoFlow's case is real and narrow: 2,700W more continuous output, a 10-year warranty against 5, and 5,600W of solar input against 3,000W. If the loads you must run at the same time add up to more than 4,500W, stop here and buy the EcoFlow.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
Capacity
So the decision is about timing, not value. The S5000 lets you buy one cabinet now and stack packs onto it as your outages argue for them, up to 30,144Wh, more than double the EcoFlow bundle's 12,288WhB6. Our record carries no BP5000 price, so the cost of that path is still a blank.
DELTA Pro Ultra + 1 Battery: 12,288Wh, cost per Wh $.49SOLIX S5000: 5,024Wh, cost per Wh $.50S5000 takes up to five BP5000 packs of 5,024Wh each, 30,144Wh in totalB6
Why it mattersIf you can't yet say how many kilowatt-hours your worst outage needs, start with the S5000 and let the outages tell you.
continuous output
Headroom helps a compressor start. It does nothing when the compressor, the fridge and the well pump all want to run together. That sustained ceiling is where the EcoFlow pulls away, and it's the one gap no BP5000 closes, because packs add watt-hours, not inverter wattsB2B6.
EcoFlow: 7,200W continuous, 10,800W surgeS5000: 4,500W continuous, 8,000W peakB14S5000 AC output tops out at 4,500W at 120V or 240V split-phase; expansion packs join through a separate DC portB2B6
Why it mattersAdd up what has to run together during an outage; if it clears 4,500W, the EcoFlow is the only answer on this page.
cost / lifetime kWh
A cycle rating and a warranty answer different questions. The first is Anker's estimate of how long the cells last; the second is a promise EcoFlow pays for if they don't. A backup battery that cycles a few dozen times a year never gets near either cycle figure, so for pure standby the warranty is the number that touches your wallet, and it belongs to the EcoFlow.
EcoFlow: 4,000 cycles, 10-year warranty, $0.12 per lifetime kWhS5000: 6,000 cycles to 80%, 5-year warranty, $0.08 per lifetime kWhB12S5000 lifetime figures are Anker's internal testingB0
Why it mattersIf this battery will cycle daily off solar, take the S5000's lower lifetime cost; if it will sit on standby for a decade, weigh the EcoFlow's extra five years of coverage before you decide.
The specific dimensions that decide these two units — everything else is a tie.
Growth Path
Selected because: The S5000's case rests on adding BP5000 packs later instead of buying 12,288Wh up front.
solar input
The engine hands the growth path to the EcoFlow on solar input, 5,600W against 3,000W, and for a big off-grid array that's fair. For most buyers the growth question is simpler: do you want to own 12,288Wh tonight, or 5,024Wh tonight with an option on up to 30,144WhB6?
Each side has a catch. On the Anker side, our record has no price for a BP5000, so the option's cost is unknown. On the EcoFlow side, you've already paid for the second battery whether your outages ever reach it or not.
Lifetime Value
Selected because: Per watt-hour the two cost the same, so lifetime cost and warranty are where the money question actually splits.
cost / lifetime kWh
Spread over its rated life, the S5000's energy costs $0.08 a kilowatt-hour and the EcoFlow's $0.12. The EcoFlow still delivers more energy in total, 49,152 kWh against 30,144 kWh, simply because each of its cycles is bigger.
That's the daily-solar buyer's math. The standby buyer has a different one: the EcoFlow's 10-year warranty covers twice the calendar time of the S5000's 5, and a battery waiting in a utility room for storms runs out of calendar long before it runs out of cycles.
Portability & Form Factor
Selected because: A 293.6 lb stack against a 97 lb cabinet on wheels decides who can move it at all.
weight
The S5000 is a 97 lb cabinet with wheels, a pull rod and a step on the back marked for tipping it onto themB10B11. One person rolls it from garage to driveway. The EcoFlow's 293.6 lb arrives as separate boxes, so no single lift is that heavy, but it's a system you place once and leave.
That's why the camping and tailgate rows go to the S5000 without a fight. Nobody brings an inverter-and-battery stack to a tailgate.
Your Life, Your Pick
Selected because: The EcoFlow takes three rows, the S5000 two, one is shared, and the split runs straight along staying home versus leaving it.
All three of the EcoFlow's wins are the same win: more battery. Through an 8-hour blackout it finishes at 16% used against the S5000's 39%, leaving 5.3 more nights like that one to the S5000's 1.6. The van-life row is the only outright fail on the page, and a near one: the S5000 comes up 415Wh short under the engine's flat 15% derate, though its nameplate 5,024Wh would clear the 4,685Wh load.
The S5000's two wins are both about leaving the house. If you never will, those rows are worth nothing to you, and the blackout row is worth everything.
Strengths & trade-offs
EcoFlow DELTA Pro Ultra + 1 Battery
Strengths
- +Larger battery capacity
- +Higher AC output
- +Longer warranty
- +Faster solar charging
Trade-offs
- –Substantially more expensive (+$3,499) than the SOLIX S5000.
- –Significantly heavier (+196.6 lbs), making it harder to move.
- –Very heavy unit that may be difficult for one person to lift.
- –Shorter-lived battery — rated for 4,000 charge cycles vs the SOLIX S5000's 6,000, so it wears out sooner.
Anker SOLIX S5000
Strengths
- +Costs $3,499 less
- +Lighter by 196.6 lb
- +Rated for 6,000 charge cycles — much longer battery lifespan
Trade-offs
- –Weaker inverter (-2,700W) 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 + 1 Battery at 293.6 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 + 1 Battery'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 + 1 Battery
Both survive the night. The DELTA Pro Ultra + 1 Battery 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
Both carry a CPAP night with most of the battery untouched, so capacity decides nothing here. What the easier-to-carry tiebreak misses is placement: the S5000's rating label keeps a battery this size out of sleeping rooms, so plan on a cord from the hall or garage, and check the EcoFlow's siting guidance before assuming it can sit by the bed.
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 + 1 Battery
The DELTA Pro Ultra + 1 Battery 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 + 1 Battery at 293.6 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 + 1 Battery'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 + 1 Battery
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 + 1 Battery 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 + 1 Battery runs 51h vs 20.8h.
$5,999 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. It costs the same per watt-hour as the EcoFlow, is rated for 6,000 cycles against 4,000, weighs 97 lb on its own wheels against a 293.6 lb stack, and takes up to five BP5000 packs when 5,024Wh stops being enoughB6. The DELTA Pro Ultra + 1 Battery earns its $3,499 premium only if you need more than 4,500W running at once, want 10 years of coverage instead of 5, or need 12,288Wh in the house before you'd get round to adding a pack. Nobody has tested the S5000 independently yet, so this call rests on Anker's own documentationB0.
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 + 1 Battery price$5,999.00 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 + 1 Battery $5,899
The lowest we have recorded. A Black Friday price above it is a sale this unit has already had.
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 + 1 Battery rates 3.7/5 (25th 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 + 1 Battery (293.6 lbs) is spread across its boxes — no single lift, but nothing you reposition on a whim. That's a 197 lb difference, and it is paid once — getting the heavier one into position, not every time you move it.
UPS Switchover: 0ms-rated vs ≤10ms
Both list a UPS mode, at different rated speeds. The DELTA Pro Ultra + 1 Battery is rated 0ms — a no-break design on paper, which is the maker's classification rather than a stopwatch result. The SOLIX S5000 is rated ≤10ms — quick enough on paper that desktop PCs and routers should ride through, treating that as the rating it is. If a computer with unsaved work is the thing being protected, the stated class is worth the attention; nothing here is a lab result.
Warranty: 10 Years vs 5
The DELTA Pro Ultra + 1 Battery is covered for 10 years against the SOLIX S5000's 5 years. An underrated factor if you're keeping this unit for years.
Battery Lifespan in Real Years
The SOLIX S5000 is rated for 6,000 cycles vs 4,000. In real life: at daily use, that's 16.4 vs 11 years. At weekend use (twice a week), it's 58 vs 38 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 + 1 Battery, so count lifetime energy — roughly 30,144 kWh against 49,152 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 + 1 Battery 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 + 1 Battery still delivers more over its shorter horizon (49,152 vs 30,144 kWh). Years measure wear, not usefulness.
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
Long rated cell life is the S5000's calling card: Anker rates it for 6,000 cycles to 80% capacity, by its own testing.
Worth knowing
Support quality appears to be declining from its historically excellent level. Firmware updates have removed features without warning. Expansion ecosystem is smaller than EcoFlow's.
Analyst note
EcoFlow brings the bigger ecosystem and a whole-home platform with a longer record in people's houses. Anker brings a longer cycle rating on a unit nobody has tested independently yet. On this pair, the 4,500W ceiling and the 293.6 lb stack matter more than either badge.
Growth path
DELTA Pro Ultra + 1 Battery
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 5,600W 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 + 1 Battery's higher solar ceiling (5,600W 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 + 1 Battery
Field data on this exact bundle is thin. Our research found one detailed forum thread and little else, with nothing on the two-battery configuration specifically or on long-term durabilityA0. That thread's owner came away lukewarm and unlikely to expand itA4, and listed specific complaints: no real manualA5, radio interference at 146.520MHz even with the inverter offA6, and a support answer suggesting a faraday cageA7.
The same owner found no state-of-charge graph in the appA8 and watched the charge reading fall from 90% to 8% after a few days of overnight useA9. One commenter was put off that the fans always runA1; the other fan reports in the ledger may describe a different maker's inverter, so we don't lean on themA0. Read this as one unhappy owner in detail, not a verdict on every unit.
“When the fans are not on, the inverter emits zero noise...even when I put my ear against the case.”
Sources
windinmyface.com · diysolarforum.com
Anker SOLIX S5000
There's no field evidence on the S5000 yet: everything we hold is Anker's own documentationB0. That paperwork does establish the facts this page argues from, including a 5,024Wh LiFePO4 packB1, 4,500W of AC output at 120V or 240V split-phaseB2, room for five BP5000 packsB6 and a 6,000-cycle rating to 80%B12. How it holds up in a real garage through a real storm is still unknown.
“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
- SoC/battery metering appears unreliable, with reported percentage dropping much faster than expected after resuming charge cycles [DELTA Pro Ultra + 1 Battery · 2 entries]
- Support interactions were unhelpful or dismissive when owners raised specific technical issues (manual gaps, RFI, missing SoC graph) [DELTA Pro Ultra + 1 Battery · 3 entries]
- Fan behavior/noise is a recurring point of owner scrutiny, though direct DPU-specific noise data is thin and partly inferred from sibling EG4 units [DELTA Pro Ultra + 1 Battery · 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
“Yuck—fans always run even on the expensive high end Delta Pro Ultra?”
windinmyface.com blog — 'Fan Noise with Solar Power / Solar Generators (Anker, Ecoflow, EG4)' (comment thread) · 2024-12 · [negative]
- A4
“Pulled the trigger on an EcoFlow Delta Pro Ultra (DPU) and I'm kind of meh on it and unlikely to expand or integrate it into the house.”
diysolarforum.com — 'EcoFlow Delta Pro Ultra issues' · 2024-02 · [negative]
- A5
“No real manual. All they have is the web user guide which is superficial if I'm being generous.”
diysolarforum.com — 'EcoFlow Delta Pro Ultra issues' · 2024-02 · [negative]
- A6
“Even when the inverter is not running, it interferes with common frequencies like 146.520MHz... Turn off the DPU, emission goes away.”
diysolarforum.com — 'EcoFlow Delta Pro Ultra issues' · 2024-02 · [negative]
- A7
“I contacted EcoFlow support and they told me I could put it in a "faraday cage".”
diysolarforum.com — 'EcoFlow Delta Pro Ultra issues' · 2024-02 · [negative]
- A8
“No State of Charge graph in the app. Figured if they were showing charts of Input and Output over time, they must have a SoC chart. Nope.”
diysolarforum.com — 'EcoFlow Delta Pro Ultra issues' · 2024-02 · [negative]
- A9
“After a few days of using it overnight and letting it charge back up to "90%", it'd go from "90%" down to "8%".”
diysolarforum.com — 'EcoFlow Delta Pro Ultra issues' · 2024-02 · [negative]
- B1
“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.”
Anker rating label, model AS510 (certified 2026-09-15) · 2026-09-15 · [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]
- B10
“An upright cabinet with a handle on top, a full-width front panel with a display, and wheels at the base; the label drawing of the back adds a foot step marked STEP ON for tipping it back onto its wheels.”
Power Station Arena, read from the S5000 card in the Anker app and the label drawing, 2026-09-20 · 2026-09-15 · [positive]
- 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]
Research compiled October 9, 2026.
Who Should Buy Which
Buy the DELTA Pro Ultra + 1 Battery if you…
- →You're backing up a house whose must-run loads add up to more than 4,500W at once, and you'd rather pay once than build up to it.
- →The battery will sit in a utility room for a decade waiting for storms, and you value a 10-year warranty over a longer cycle rating.
- →You're planning a solar array bigger than 3,000W and want 5,600W of input to soak it up.
Buy the SOLIX S5000 if you…
- →You want real backup for overnight outages but can't yet say whether one cabinet will be enough, so you'd rather buy it now and add BP5000 packs once your outages make the case.
- →The battery sometimes has to leave the garage, for a campsite, a tailgate or a relative's house, and 97 lb on wheels is the most you'll move alone.
- →You'll cycle it daily from solar and want the lower cost per lifetime kilowatt-hour.
If neither fits
If you rent, or what you want is a fridge, a router and a few lights through the odd outage, both are far more battery than the job. A mid-size portable station handles that for a fraction of the money and lives in a closet.
The Bottom Line
Same price per watt-hour, so the question was never value. The S5000 gives you 5,024Wh you can roll, a 6,000-cycle rating and a path to more; the EcoFlow gives you 12,288Wh, 7,200W and a decade of coverage in a stack you place once.
Unless your must-run loads clear 4,500W, buy the S5000 and add packs when the outages ask for them.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
Is the Anker SOLIX S5000 cheaper than the EcoFlow DELTA Pro Ultra + 1 Battery?
Up front, yes, by $3,499, but per watt-hour they're level to within a cent. The EcoFlow's higher price buys more battery, 12,288Wh against 5,024Wh, not a worse rate. Over the rated cycle life the S5000 works out cheaper per kilowatt-hour delivered, $0.08 against $0.12.
Can the Anker SOLIX S5000 run a whole house?
It can run a lot of one: Anker rates it at 4,500W continuous with an 8,000W peak, and 240V split-phase through an L14-30R. What it can't do is go past 4,500W of simultaneous load, and no expansion pack changes that. The DELTA Pro Ultra + 1 Battery carries 7,200W, which is the main reason to buy it.
Can I expand the S5000 to match the DELTA Pro Ultra + 1 Battery's capacity?
Yes. Anker documents up to five BP5000 packs of 5,024Wh each, for 30,144Wh in total. One pack takes the S5000 to 10,048Wh and two take it to 15,072Wh, past the EcoFlow bundle's 12,288Wh. Our record doesn't price the BP5000, so we can't yet say what that path costs.
How heavy is the Anker SOLIX S5000 compared with the DELTA Pro Ultra?
The S5000 is 97 lb, on wheels with a pull rod and a foot pedal for tipping it back. The DELTA Pro Ultra + 1 Battery totals 293.6 lb across separate boxes, so no single piece is that heavy, but it's built to be placed once and left.
Where to buy
EcoFlow DELTA Pro Ultra + 1 Battery
$5,999.00
$5,999.00 · 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.