Verification
+6 EcoFlowonly the EcoFlow DELTA Pro: UL 2743 listed; only the Dabbsson DBS3500: Claimed only.
Product comparison · Portable Stations
EcoFlow DELTA Pro vs Dabbsson DBS3500
The EcoFlow DELTA Pro scores 7.6 and ranks 1st of 74 in Portable Stations; the Dabbsson DBS3500 scores 6.2 and ranks 38th of 74 in Portable Stations. The DELTA Pro leads on verification, the DBS3500 on recharging.
All 13 EcoFlow products 
EcoFlow DELTA Pro
$1,899 · 1st of 74 in Portable Stations
Buy Now- Verification — 8 against 2
- Capacity — 10 against 8
7.6
6.2
All 11 Dabbsson products 
Dabbsson DBS3500
$1,599 · 38th of 74 in Portable Stations
Buy Now- Recharging — 8 against 4
- Battery Life — 8 against 6
Across everything we scored, EcoFlow DELTA Pro sits 1.42 ahead — led by verification.
Verdict
DELTA Pro ahead · +1.42 (7.6 vs 6.2)Pick the EcoFlow DELTA Pro when
Verification matters8vs2UL 2743 listed only on the DELTA Pro
Capacity matters10vs8
Backup readiness matters7vs6
Pick the Dabbsson DBS3500 when
Recharging matters8vs4
Battery life matters8vs6
Price matters$1,599vs$1,899
Scored 10 October 2026 from published specs and owner reviews. We don't buy or test units. How we score
Most common complaints
From each product's own owner reviews and retailer ratings.
EcoFlow DELTA Pro
- Durability and the pull handle, tagged negative in 11 mentions
- Battery life, tagged negative in 8 mentions
- Smoke from the unit, seven events from six owners
Dabbsson DBS3500
- Too heavy to be very portable, per one owner
- Needed support for issues, per one owner
Where the EcoFlow DELTA Pro and Dabbsson DBS3500 differ
Scores on a 0–10 scale. Each row is one criterion, biggest difference first.
Capacity
+2 EcoFlowRecharging
+4 DabbssonBattery Life
+2 DabbssonBackup Readiness
+1 EcoFlowPower Output
tiedWarranty & Support
tiedValue
one side unscoredWhat EcoFlow DELTA Pro and Dabbsson DBS3500 owners report
Independent sources, scored for each model. DELTA Pro on 5 of five, DBS3500 on 4.
Both readings are about these exact models.
What they say
EcoFlow DELTA Pro
- Six DELTA Pro owners in r/Ecoflow_community and r/RVLiving reported seven smoke events between May 2023 and July 2026, including a replacement unit that smoked after the first one had (February 2026, 154 comments) and a unit that smoked at a 30 W load (February 2026).
- Four owners describe running through several replacement units with error codes, and one unit was bricked by a firmware update (January 2026).
- Three owners praise it for RV air conditioning and long vanlife use.
Dabbsson DBS3500
- In r/SolarDIY a DBS3500 owner found it too heavy to be very portable, had some issues that support resolved helpfully after several messages, and said it runs some appliances for a couple of hours, longer with a solar panel (about 2024).
The Dabbsson DBS3500 reading covers its product line.
What they say
EcoFlow DELTA Pro
- CNET drew 3,328 Wh on AC, 92 percent of rated.
- OutdoorGearLab, which buys its test units, charged it at 1,412 Wh an hour, about 2.6 hours, and drew 2,950 Wh in its table and 3,060 Wh in its text, 82 to 85 percent (May 2025).
- StorageReview drew 3,000 Wh at a 350 W load and needed 4,180 Wh to recharge.
- TheSolarLab, which earns affiliate commission, found its own five-year-old unit at 84 percent efficiency in 2026 but struggling to hold maximum output.
Dabbsson DBS3500
- No written test of the DBS3500 with measurements was found, so this reads the DBS2300, its closest Dabbsson sibling.
- CNET, which links to dabbsson.com through affiliate links and whose line "I love that it's a modular format" Dabbsson quotes on its home page, measured 2,007 Wh delivered from the plain DBS2300, 86 percent of rated, and a full wall charge in about 122 minutes (best-list updated March 2026).
- Trusted Reviews, which Dabbsson also quotes on its home page, called the DBS2300 the best expandable station it had tested and noted its 15 ms switchover was too slow for critical computers (July 2023).
- The Gadgeteer found the inverter inefficient on loads under 400 W, drawing 870 Wh from a full charge to run a 30 to 100 W load through a UPS, while it charged two other stations and ran 3,000 W of heaters in boost mode (October 2023).
YouTube
+1 EcoFlowBoth readings are about these exact models.
What they say
EcoFlow DELTA Pro
- EEVblog2 measured it at a 1 kW load and found its on-screen percentage non-linear (February 2023, about 25,000 views).
- HOBOTECH's technical review is labelled as a paid promotion and carries an EcoFlow code (July 2021, about 177,000 views), and Will Prowse discloses that every video includes paid promotion or free product (2021, about 618,000 views); neither published a usable figure.
Dabbsson DBS3500
- Every channel carries a Dabbsson tie, and Dabbsson places all three on its own DBS3500 page.
- ReeWray Outdoors, which links to Amazon as an associate and passes on a Dabbsson coupon code, tested its AC capacity, expansion, solar charging, harmonic distortion, UPS mode and no-load drain and called it the best budget high-capacity expandable station it had tested (March 2024, about 22,700 views).
- Phandroid, in a video it says Dabbsson sponsored, found its capacity enough for a refrigerator, lights and devices in an outage (March 2024, about 11,700 views).
- Red Beard's Garage welded from it (date not read).
Amazon
+4 EcoFlowBoth readings are about these exact models.
What they say
EcoFlow DELTA Pro
- The DELTA Pro listing (B0C1Z4GLKS) reads 4.6 from 669 ratings, 85 percent five-star and 6 percent one-star, pooled across its panel and extra-battery styles, and EcoFlow is not its current seller.
- Amazon's review tags are positive on performance (75 of 80 mentions) and battery life (34 of 42), and negative on durability (11 of 20), mostly a breaking pull handle.
Dabbsson DBS3500
- Dabbsson's DBS3500 listing on Amazon US (B0CVVMXJRS) reads 4.0 from 24 ratings; it was priced $2,545.62 on 2026-10-10 against $1,599 on dabbsson.com, and its star split was not read.
Owner reviews
one side unscoredNo usable source for the Dabbsson DBS3500.
What they say
EcoFlow DELTA Pro
- Home Depot's family files hold 19 native reviews of the station alone from 2022 to 2026, averaging 4.3.
- Walmart's file of 405 leaves 11 native reviews averaging 4.4 once 393 syndicated from EcoFlow are removed.
- Costco's two-unit DELTA Pro home system reads lower, 3.8 across 35 readable native reviews, with 9 of 29 not recommending it.
Dabbsson DBS3500
No usable source.
EcoFlow DELTA Pro vs Dabbsson DBS3500: pros and cons
What each one does well, and where it falls short.
EcoFlow DELTA Pro
Strengths
- 3,600 W continuous output
- 3,600 Wh in one unit
- Expands to 10.8 kWh with two extra batteries
- Takes 1,600 W of solar at up to 150 V
- UL 2743 and UL 1973 listings by model in SGS's directory
Drawbacks
- 99 lb
- 240 V needs two units and a hub
- Switchover up to 30 ms
- 2.7 hours to charge on 120 V
- Three years of the warranty need registration
Dabbsson DBS3500
Strengths
- 3,600 W continuous with a 7,200 W surge
- 2,400 W solar input at 12 to 150 V
- AC and solar together at 3,400 W
- EPS switchover within 15 ms
- Takes two DBS5300B batteries14,070 Wh per unit
- Two units link to 240 V and 7,000 W
Drawbacks
- Dabbsson sells no transfer switch or home panelits install guide points to third-party Reliance switches
- One unit gives 120 V onlythe page's 240 V and 7,000 W need two units and the A35S connector
- The page's 28,140 Wh needs two units and four DBS5300B batteries; one unit reaches 14,070 Wh
- The US spec table gives 4,500 cycles and 90.5 lbthe US manual 4,000 cycles and 89.7 lb
- 90.5 lbmoved on two wheels
- The US product page still runs "valentine sale" free-300E and free-600L bullets beside the free 300E in the variant title
- The US manual prints an ETL markbut Intertek's directory does not list it
EcoFlow DELTA Pro vs Dabbsson DBS3500: the numbers
Price, scores and rank, then only the specs that differ. Green marks the side with more.
- Rated cyclesEcoFlow3,000-3,999 cyclesDabbsson More4,000-5,999 cycles
- Solar inputEcoFlow1,000-1,999 WDabbsson More2,000-3,999 W
- Backup switchoverEcoFlow21-30 msDabbsson More11-20 ms
- Safety listingsEcoFlow MoreUL 2743 listedDabbssonClaimed only
- WeightEcoFlow99.0 lbDabbsson90.5 lb
Same on both
- 3,000-3,999 WhCapacity
- 3,000-3,999 WAC output
- 240 V by linking two unitsOutput voltage
- LiFePO4Battery chemistry
- 10-19.9 kWhExpandable to
- 5 YearsWarranty
We earn a commission if you buy through these links. It never changes a score.
Not sold on either one?
The top-scored and the cheapest other pick from each brand.
More from EcoFlow 9 scored in Portable Stations
What’s different
- Nothing we record differs.
Pick it ifRecharging matters7vs4
What’s different
- Capacity: 700-999 Wh, not 3,000-3,999 Wh
- AC output: Under 1,000 W, not 3,000-3,999 W
Pick it ifPrice matters$389vs$1,899
More from Dabbsson 9 scored in Portable Stations
What’s different
- Capacity: 1,000-1,499 Wh, not 3,000-3,999 Wh
- AC output: 2,000-2,999 W, not 3,000-3,999 W
Pick it ifPrice matters$699vs$1,599
What’s different
- Capacity: 700-999 Wh, not 3,000-3,999 Wh
- AC output: Under 1,000 W, not 3,000-3,999 W
Pick it ifPrice matters$299vs$1,599
EcoFlow DELTA Pro vs Dabbsson DBS3500: common questions
Is the EcoFlow DELTA Pro better than the Dabbsson DBS3500?
On our scores, the EcoFlow DELTA Pro is ahead, 7.6 against 6.2. The EcoFlow DELTA Pro leads on verification (8 against 2), capacity (10 against 8) and backup readiness (7 against 6). The Dabbsson DBS3500 leads on recharging (8 against 4) and battery life (8 against 6).
Which is cheaper, the EcoFlow DELTA Pro or the Dabbsson DBS3500?
The Dabbsson DBS3500, at $1,599 against $1,899: $300 less.
Which has more safety listings, the EcoFlow DELTA Pro or the Dabbsson DBS3500?
The EcoFlow DELTA Pro. The EcoFlow DELTA Pro lists UL 2743 listed; the Dabbsson DBS3500 lists none.
What do owners say about the EcoFlow DELTA Pro and the Dabbsson DBS3500?
Across 4 independent sources scored for both, the EcoFlow DELTA Pro is ahead on Google, YouTube and Amazon; Reddit is level.
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Scores calculated 10 October 2026 · Products excluded where fewer than two independent sources cover them · · How we score