Head-to-head test
EcoFlow DELTA 2 vs EcoFlow RIVER 2 Pro
The RIVER 2 Pro is $150 cheaper than the DELTA 2 now, and the DELTA 2 only earns that gap back in the narrow band of loads — around 670 watt-hours — where the RIVER 2 Pro comes up just short.
Written by Ian SchneiderUpdated
Solar & Off-Grid Tester, Station Arena Test Desk
EcoFlow
DELTA 2
3,128Power Score · Appliance Class
$499.00 list · direct from EcoFlow
EcoFlow
RIVER 2 Pro
2,481Power Score · Appliance Class
$349.00 list · direct from EcoFlow
Spec deltas
The RIVER 2 Pro costs $349 against the DELTA 2's $499 — a $150 gap, and the RIVER 2 Pro is the cheaper of the two. Same brand, same 3,000-cycle rating, same 5-year warranty, and this time the smaller unit is also the budget one.
The DELTA 2 still has the bigger spec sheet: 1,024Wh against 768Wh, 1,800W continuous against 800W, 2,700W surge against 1,600W, and 500W of solar input against 220W. None of that changed. What changed is what it costs to get it.
The engine's own lifetime math has flipped too: $0.15 per lifetime kWh for the RIVER 2 Pro against $0.16 for the DELTA 2, and $70 a warranty year against $100. The DELTA 2 is still the more capable unit. It's no longer the cheaper one, on any measure.
What the Numbers Reveal
Each conclusion stated first — the numbers behind it on one line, the full analysis below.
cost / lifetime kWh
Cost per warranty year makes the same point sharper: $100 a year for the DELTA 2 against $70 for the RIVER 2 Pro, on the identical 5-year EcoFlow warranty. The $150 premium isn't offset anywhere in the ownership math — it has to be justified by the unit's own capability instead.
DELTA 2 costs $499 against RIVER 2 Pro's $349Lifetime cost is $0.16 per kWh for the DELTA 2 against $0.15 for the RIVER 2 Pro
Why it mattersBuyers should stop assuming the pricier EcoFlow pays for itself the way it used to. That argument no longer holds, so the DELTA 2 needs its own reason to win a given buyer.
continuous output
The Tailgate Party scenario shows what that ceiling buys in practice: a 670Wh load the DELTA 2 clears at 77% of capacity while the RIVER 2 Pro comes up short at 103%. That's the one place on this page where the extra output and capacity convert into a real can-or-can't difference, not just a smaller margin.
DELTA 2 continuous output is 1,800W against RIVER 2 Pro's 800WDELTA 2 surge ceiling is 2,700W against RIVER 2 Pro's 1,600W
Why it mattersIf the reader's actual loads sit anywhere near that 670Wh range, or involve a compressor or heating element with a real startup surge, the DELTA 2's premium is buying something concrete. Everyone else is paying for headroom they won't use.
solar input
Owner reports back this up on both sides: the DELTA 2's fans are the well-documented complaint at high loadA1A2, but EcoFlow's own spec sheet puts the RIVER 2 Pro's ceiling even higher, at 62dB, and an owner modded the RIVER 2 Pro's fan specifically to quiet it downB1B2. The bigger, more powerful unit isn't the noisier one.
DELTA 2 noise rating is 50dB against RIVER 2 Pro's 62dBDELTA 2 accepts 500W of solar against RIVER 2 Pro's 220W
Why it mattersA reader picking the RIVER 2 Pro purely to avoid the DELTA 2's noise reputation is solving a problem the DELTA 2 doesn't actually have relative to its sibling.
Combined with Tailgate Party being the one scenario size (670Wh) where the DELTA 2's capacity actually flips a fail into a pass, the pattern is narrow: the $150 premium only buys a real outcome change in a specific middle band of use cases, not across the board.
Weekend Camping needs 2,100Wh; the DELTA 2 uses 241% of usable capacity and the RIVER 2 Pro 322%, both failingVan Life Daily needs 4,685Wh; the DELTA 2 uses 538% and the RIVER 2 Pro 718%, both failing
Why it mattersReaders whose real need is a multi-day outage or a full van-life setup should look past both of these units entirely rather than pay $150 more for a DELTA 2 that still can't do the job.
The specific dimensions that decide these two units — everything else is a tie.
Lifetime Value
Selected because: Price order reversed since last write ($150 cheaper for the RIVER 2 Pro, not pricier); engine's own cost-per-kWh and cost-per-warranty-year now both favor the RIVER 2 Pro too.
cost / lifetime kWh
The DELTA 2 costs $499 against the RIVER 2 Pro's $349 — a $150 gap, and it's now the RIVER 2 Pro that's cheaper. The engine's lifetime numbers agree: $0.15 per lifetime kWh for the RIVER 2 Pro against $0.16 for the DELTA 2, and $70 a warranty year against $100, on the same 3,000-cycle rating and five-year EcoFlow warranty.
That's a real reversal from a straightforward capacity-for-price trade. Paying $150 more no longer buys cheaper ownership on top of more capacity. It buys the capacity and the capability, full stop, and the reader has to decide if that's worth the premium on its own terms.
Your Life, Your Pick
Selected because: Shows the capacity gap only converts to a real outcome in one scenario size (Tailgate Party, 670Wh); everything smaller both units handle, everything bigger neither does.
Across the biggest use cases here — Weekend Camping (2,100Wh needed), 8-Hour Blackout (1,645Wh), Remote Workday (910Wh), and Van Life Daily (4,685Wh) — neither unit clears the math, so the extra $150 for the DELTA 2 shrinks the shortfall without closing it.
The one scenario where the gap flips a real outcome is Tailgate Party: a 670Wh load the DELTA 2 covers at 77% of capacity and the RIVER 2 Pro misses at 103%. CPAP Overnight, both units handle comfortably (37% and 49% of capacity). Outside that narrow tailgate-sized band, capacity isn't the reason to pick one over the other.
What the Specs Don't Tell You
Selected because: Five cards fire (noise, expansion, surgeRatio, ups, warranty); warranty is newly relevant given the price gap.
Five cards fire on this pair, and four still point toward the DELTA 2: it's quieter despite more than double the output (50dB against 62dB), has more surge headroom for anything with a compressor (2,700W against 1,600W), switches over faster (20ms against 30ms), and is the only one of the two that can add capacity later.
The fifth card is new: the warranty comparison. Both carry EcoFlow's five-year coverage, but at today's prices the cost per warranty year is $100 for the DELTA 2 against $70 for the RIVER 2 Pro — the same length of protection now costs meaningfully less on the cheaper unit.
Growth Path
Selected because: Only structural advantage that doesn't move with price — the DELTA 2's expansion path.
solar input
The RIVER 2 Pro's growth path ends at checkout: 768Wh is what you'll have for as long as you own it. The DELTA 2 supports EcoFlow expansion batteries, so a capacity need down the road is a purchase you add to rather than a unit you replace.
That's the one advantage on this page that doesn't move with the price gap. It's worth the same whether the DELTA 2 costs less or $150 more. The question is whether you're the buyer who'll actually use it, or paying for a door you'll never walk through.
Portability & Form Factor
Selected because: RIVER 2 Pro's other independent advantage (9.8 lbs lighter), now paired with being cheaper too.
weight
17.2 lbs against 27 lbs is a 9.8-lb gap — the RIVER 2 Pro's other real edge, and one that doesn't depend on how the prices move. It's the difference between a one-handed lift and a two-handed one.
Combined with now being $150 cheaper too, weight stops being the RIVER 2 Pro's lone consolation prize and becomes a second, independent reason to buy it, if you're not specifically buying for the DELTA 2's extra capacity or expansion path.
Strengths & trade-offs
EcoFlow DELTA 2
Strengths
- +Larger battery capacity
- +Higher AC output
- +Faster solar charging
Trade-offs
- –Substantially more expensive (+$150) than the RIVER 2 Pro.
EcoFlow RIVER 2 Pro
Strengths
- +Costs $150 less
- +Lighter by 9.8 lb
Trade-offs
- –Weaker inverter (-1,000W) limits appliance compatibility.
- –Can receive complaints about fan noise under heavy load.
- –Sealed capacity — the DELTA 2 can add batteries to grow past 768Wh; this one can't.
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
Neither unit
Neither unit can fully handle this scenario (needs 2,100Wh). You'd need a higher-capacity station or to cut back on usage.
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
Neither unit
Neither unit can fully handle this scenario (needs 1,645Wh). You'd need a higher-capacity station or to cut back on usage.
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
DELTA 2
Both handle a CPAP overnight easily — the RIVER 2 Pro uses 49% of its capacity, the DELTA 2 just 37% — so this alone isn't a reason to pay $150 more. The DELTA 2 only buys extra nights before a recharge.
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
Neither unit
Neither unit can fully handle this scenario (needs 910Wh). You'd need a higher-capacity station or to cut back on usage.
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
DELTA 2
This is the one scenario size where the price gap earns itself back: the DELTA 2 clears a 670Wh tailgate load at 77% of capacity, while the RIVER 2 Pro comes up short at 103%. If your loads regularly land around here, that's the real argument for the DELTA 2.
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 unit can fully handle this scenario (needs 4,685Wh). You'd need a higher-capacity station or to cut back on usage.
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: DELTA 2 runs 4.2h vs 3.2h.
$499 list · direct from EcoFlow
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 0–58hComfort & Convenience
Makes off-grid life actually enjoyablescale 0–11.6hHigh-Draw Appliances
These reveal the real limitsscale 0–0.9h¹ 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 26, 2026
Verdict: the EcoFlow RIVER 2 Pro
The RIVER 2 Pro is now $150 cheaper than the DELTA 2 ($349 against $499), and the engine's own lifetime numbers back it as the better buy on paper too — $0.15 per lifetime kWh against $0.16, and $70 a warranty year against $100, on the identical 5-year EcoFlow warranty. Across the biggest real-world loads here — Weekend Camping's 2,100Wh, an 8-Hour Blackout's 1,645Wh, Van Life Daily's 4,685Wh — neither unit is sufficient anyway, so the DELTA 2's extra capacity mostly buys a smaller shortfall, not a working solution. The one place it earns its premium outright is a load around 670Wh, the Tailgate Party test, where the DELTA 2 clears the job at 77% of capacity and the RIVER 2 Pro falls short at 103%; the DELTA 2 also keeps real advantages in continuous output, surge headroom, and being the only one of the two that can add capacity later. For a typical CPAP-and-laptop-and-phone load, take the RIVER 2 Pro and keep the $150. If your loads land near that 670Wh mark, you need real surge capacity, or you want room to expand later, the DELTA 2 is still the right call — just no longer the obvious one.
Editor-assigned confidence, based on cited owner research and spec analysis.
List prices as of July 26, 2026. The links below open EcoFlow's current price.
$349.00 list · direct from EcoFlow
or check the DELTA 2 price$499.00 list
Written by Ian Schneider, Solar & Off-Grid Tester · Station Arena Test Desk · Updated July 26, 2026
Measured Data
Benchmark scores and the full spec record, side by side.
Benchmark scores
Not rated for both units (minimum threshold unmet): UPS, RV Living, Home Backup, Food Truck.
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 2 rates 4.0/5 (39th percentile of 24 Everyday-class units), and RIVER 2 Pro rates 4.5/5 (72nd percentile of 19 Compact-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.
More Power, Less Noise
The DELTA 2 pushes more than double the RIVER 2 Pro's continuous output and still runs quieter under load — 50dB against 62dB. That's not the usual tradeoff, and it holds regardless of which side of the price gap you land on.
One Closed, One Open
The RIVER 2 Pro's 768Wh is fixed for the life of the unit. The DELTA 2 supports EcoFlow expansion batteries, so a future capacity need is a purchase you add to rather than a unit you replace — the one advantage that doesn't erode no matter how the price gap moves.
2,700W vs 1,600W of Surge Headroom
The DELTA 2's inverter has substantially more room to absorb a startup spike, which matters most for anything with a compressor or heating element. The RIVER 2 Pro's 1,600W ceiling is fine for smaller gear but won't start what the DELTA 2 can.
20ms vs 30ms Switchover
The DELTA 2 switches over modestly faster. Neither is line-interactive-class speed, so treat this as a minor edge, not a deciding one.
Same Years, Different Math
Both units carry EcoFlow's 5-year warranty, but the cost per warranty year now diverges: $100 for the DELTA 2 against $70 for the RIVER 2 Pro. Equal coverage length used to come with roughly equal economics too. At today's prices, the RIVER 2 Pro is the cheaper way to get the same five years.
Full record above — the Test Desk pick is the RIVER 2 Pro.
Check RIVER 2 Pro price →or check the DELTA 2 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 ($0.16/kWh vs $0.15/kWh). The price difference is what you see on the sticker — neither is a hidden bargain or rip-off.
Growth path
DELTA 2
EXPANDABLESupports EcoFlow expansion batteries, so you can add capacity later without replacing the base unit — useful if your needs may climb past 1,024Wh.
Accepts up to 500W of solar. Suitable for a 1-2 panel setup.
Generous port selection supports complex multi-device setups.
Expansion batteries are EcoFlow-specific. You're investing in the EcoFlow ecosystem.
RIVER 2 Pro
FIXED CAPACITYFixed at 768Wh, with no expansion — so size it for your needs up front rather than planning to add capacity later.
Accepts up to 220W of solar. Limited to a single portable panel.
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
The RIVER 2 Pro is sealed at 768Wh, which is fine if that covers you. The DELTA 2 starts at 1,024Wh and can grow beyond it with EcoFlow expansion batteries — real headroom the RIVER 2 Pro doesn't have if your needs climb toward partial-home backup.
What Owners Report
Patterns from published owner reports and long-term reviews — every claim cited to its source below.
EcoFlow DELTA 2
Owners consistently flag fan noise once load climbs: fans trigger above roughly 120W of draw, and at full output (1,500-1,800W) they hold steady around 48-55dBA1, loud enough that one review compared the charging noise to a gaming laptop, though the app lets you throttle charge speed to quiet it downA2. EcoFlow has reportedly signaled a firmware fix for the noise, the kind of thing it's addressed on other models after launchA4.
That's set against an otherwise strong long-term record: 18 months of real outages, camping trips, and daily home-office use credited the unit with fast charging, reliable LiFePO4 chemistry, and genuine expandabilityA3. The noise complaint is real and repeated, but it's the one blemish on an unusually well-documented ownership history.
“When charging at 1200W the fans sound like a gaming laptop, though you can lower the charging speed in the app to silence it.”
Sources
portablepowerlab.com
EcoFlow RIVER 2 Pro
Owner-specific detail for the RIVER 2 Pro, as opposed to the wider RIVER 2 line, is thin, but the noise pattern matches its sibling's: EcoFlow's own spec sheet discloses up to 62dB under heavy loadB2, and one owner modded the fan, cutting away internal plastic, specifically to quiet it downB1.
One CPAP user reported running a ResMed AirSense 11 through the night from a van without issueB4. Treat the RIVER 2 Pro's field record as thin and directional rather than settled. There simply isn't the volume of long-term reporting the DELTA 2 has.
“Will using River 2 Pro as a UPS affect battery life ...”
Sources
ctrl-alt-rees.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
- Fan noise under moderate-to-high load is the dominant, repeatedly-cited complaint; the fan spins up above ~120W. [DELTA 2 · 3 entries]
- Fan noise at high wattage charging/discharging is a consistent owner and manufacturer-acknowledged complaint, severe enough that some owners physically mod the unit with quieter fans. [RIVER 2 Pro · 2 entries]
- A1
“Fans trigger at anything above 120 watts; at maximum load (1,500–1,800W) they run continuously at ~48–55 dB. Powering medical equipment above 120W in a bedroom means listening to the fans or running an extension cable out of the room.”
portablepowerlab.com — EcoFlow Delta 2 Review: 6 Months of Real Use; PCWorld — EcoFlow Delta 2 review · 2026 · [negative]
- A2
“When charging at 1200W the fans sound like a gaming laptop, though you can lower the charging speed in the app to silence it.”
PCWorld — EcoFlow Delta 2 power station review · 2026 · [mixed]
- A3
“After 18 months of real-world testing through multiple power outages, camping trips, and daily home-office use, the unit earned recognition for fast charging, reliable LiFePO4 battery chemistry, and expandability.”
portablepowerlab.com — EcoFlow Delta 2 Review: 6 Months of Real Use · 2026 · [positive]
- A4
“EcoFlow officials indicated they plan to address the fan noise in an upcoming firmware update, as they have for other models after release.”
portablepowerlab.com — EcoFlow Delta 2 Review · 2026 (dated claim — may be partially addressed) · [mixed]
- B1
“I've since performed the same mod on my RIVER 2 PRO and it works great for that unit, too - although it did involve cutting away some of the internal plastic.”
ctrl-alt-rees.com blog — 'EcoFlow RIVER 2 Noisy Fan Fix!' · 2022-11-17 · [negative]
- B2
“When charging and discharging at high wattage, RIVER 2 Max and RIVER 2 Pro may make a noise up to 62db.”
EcoFlow official product page — RIVER 2 Series specs/FAQ footnotes · unknown · [negative]
- B4
“I'm very new to CPAP (1 week) and I live in a van. I have solar and a decent battery bank and I've got the ResMed DC-DC cable which powers my AirSense 11 AutoSet overnight no problem.”
Apnea Board forum — '[Equipment] EcoFlow River 2 Pro' thread · 2025-07 · [mixed]
Research compiled July 26, 2026.
Who Should Buy Which
Buy the DELTA 2 if you…
- →Your loads land in the range the Tailgate Party math represents — the DELTA 2 clears a 670Wh load at 77% of capacity while the RIVER 2 Pro falls just short at 103%. If your real draw sits anywhere near there, the extra capacity is the difference between running the setup and coming up light.
- →You want the option to add an expansion battery later instead of committing to 768Wh forever, or you're running something with a real startup surge — the DELTA 2's 2,700W ceiling against the RIVER 2 Pro's 1,600W.
Buy the RIVER 2 Pro if you…
- →Your real use case stays well under the RIVER 2 Pro's ceiling — charging a CPAP, phone, and laptop overnight, or running smaller gear — and $349 with EcoFlow's own 5-year warranty is $150 you don't need to spend.
- →You're carrying this on foot regularly, where 17.2 lbs against 27 lbs is felt every trip, and the RIVER 2 Pro's own economics edge it out too — $0.15 per lifetime kWh against $0.16, and $70 a warranty year against $100.
If neither fits
If your real job is a full weekend camping trip (2,100Wh), an 8-hour multi-appliance blackout (1,645Wh), or true daily van-life cycling (4,685Wh), neither unit clears the math — the DELTA 2 comes closer in every case, but both fall short. Look at a larger, ideally expandable unit for that kind of use, not either of these two.
The Bottom Line
The RIVER 2 Pro is $150 cheaper than the DELTA 2 now, and the engine's own numbers back it as the value pick: $0.15 per lifetime kWh against $0.16, $70 a warranty year against $100, on the same 5-year EcoFlow warranty. For a typical CPAP-and-laptop load, that's $150 you don't need to spend.
The DELTA 2 still earns its premium in a specific place: loads in the 670-watt-hour range the Tailgate Party test represents, anything with a real startup surge, or a future need for expansion capacity the RIVER 2 Pro simply can't add. Know which buyer you are before you pay the $150.
Frequently Asked Questions
Answers drawn from the spec record and cited owner research.
DELTA 2 or RIVER 2 Pro — which is the better value now that the RIVER 2 Pro is cheaper?
The RIVER 2 Pro, for most buyers. It's $150 less, and the engine's own lifetime cost comes out ahead too — $0.15 per lifetime kWh against the DELTA 2's $0.16, and $70 a warranty year against $100. Pay the $150 premium only if you specifically need the DELTA 2's extra output, surge capacity, or expansion path.
Is the DELTA 2 still worth $150 more?
Only if your loads land in the range the extra capacity actually covers. In the Tailgate Party test case (670Wh), the DELTA 2 clears it using 77% of its capacity while the RIVER 2 Pro falls short at 103%. If your use case never approaches that, the premium buys headroom you won't use.
Which one can run a space heater or window AC?
Neither reliably, but the DELTA 2 comes closer. Its 1,800W continuous rating and 2,700W surge ceiling handle more than the RIVER 2 Pro's 800W and 1,600W, though a full 8-hour blackout load (1,645Wh) still exceeds what either unit's battery holds.
Is the DELTA 2 louder since it puts out more power?
No. The DELTA 2 is rated at 50dB against the RIVER 2 Pro's 62dB, despite pushing more than double the continuous output. More power didn't cost quiet here.
Can either of these expand its capacity later?
Only the DELTA 2. It supports EcoFlow's add-on batteries, so a future capacity need is a purchase you add to. The RIVER 2 Pro is fixed at 768Wh for the life of the unit — factor that in if you expect your needs to grow.
Where to buy
EcoFlow DELTA 2
$499.00
$499.00 list · direct from EcoFlow
EcoFlow RIVER 2 ProPick
$349.00
$349.00 list · direct from EcoFlow
Prices may vary by retailer and are subject to change.