On this pageSpecs Camping, overland, van life Stationary backup, maximum runtime per dollar Daily cycling for years Smart-home control FAQ

EcoFlow DELTA 3 PlusvsDELTA 3 1500

These two units share the same $599 price, an 1800W inverter, and LiFePO4 chemistry — and then they split completely. The DELTA 3 1500 is a capacity play, delivering 50% more battery for the money. The DELTA 3 Plus carries less energy but wins on weight, solar input, recharge speed, cycle life, and software. The decision forks on a single question: is this a moving unit you recharge in the field, or a stationary box you leave plugged in for maximum runtime per dollar?

DELTA 3 Plus

$599

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Prices and availability change frequently

DELTA 3 1500

$599

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Prices and availability change frequently

Spec	DELTA 3 Plus	DELTA 3 1500
Capacity	1024Wh	1536Wh
Weight	27.6 lbs	36 lbs
Rated output	1800W	1800W
Surge (spec)	3600W^†	3600W
Chemistry	LiFePO4	LiFePO4
Cycle life	4,000 cycles to 80%	3,000 cycles to 70%^‡
AC recharge	~55 min (measured)	1.5 hr full / 60 min to 80%
Solar input	1000W (dual port)	500W (single port)
Solar recharge	~1 hr	~3.5 hr
Voltage	120V only	120V only
Ports	6× AC, 2× USB-C 140W, 2× USB-A 36W, 2× DC5521, 1× car 126W	multiple AC, 1× USB-C 100W, USB-A 12W + 18W, DC5521 38W, 1× car 126W
Warranty	5 years	5 years
Price	$599	$599
$/Wh	$0.58	$0.39

^† Independent testing measured ~2600W surge, held ~1 min before thermal trip; sustained loads near 1573W triggered thermal shutdown in testing. ^‡ Cycle-life metrics differ: the Plus is rated to 4,000 cycles to 80% retention; the 1500 is rated to 3,000 cycles to 70% retention — manufacturer specs, not the same measurement. Where a spec field is blank, that figure was not recorded in our research, not that the feature is absent.

Camping, overland, van life — carry it and recharge off solar

For mobile use: You move this unit in and out of a vehicle, recharge from solar or an alternator, and run mixed light-to-moderate loads — fridge, phones, laptops, networking gear.
Far more portable — 27.6 lbs vs 36 lbs, in a body about 40% smaller than the unit it replaces; owners upgraded specifically for the smaller footprint.
Double the solar input, and it works — 1000W across two independent 500W charge controllers vs the 1500’s single 500W port. Independent testing confirms ~1-hour refills in strong sun and validated simultaneous solar and car charging.
Fastest recharge in the class — full AC charge in ~55 minutes on an independent bench, beating the 56-minute spec.
Validated on the road — one extended test ran a fridge, Starlink Mini, and laptops across a 7,100-mile trip; pairs with the 800W alternator charger to stay topped while driving.
Usable capacity at light-to-moderate mixed loads: approximately 870–920Wh. The ~32–40W idle draw taxes long, light-load standby days, but on the move with regular cycling it stays invisible.
Why not the 1500: It weighs 8.4 lbs more, charges slower (90 minutes vs ~55), and has half the solar input through a single port. Our research notes it as a stationary unit — fine for drive-in camping, but a consideration for frequent loading and unloading. Its extra 512Wh does not buy back the weight and solar deficit for a mobile buyer. Note: the 1500 has a documented issue where it cuts solar input when AC charging starts — a real liability for mobile top-ups.
Skip the bundled 60W panels on either unit — our research calls them inadequate. Pair with 220W bifacial or 400W folding panels.

Stationary backup, maximum runtime per dollar — fridge, freezer, devices with someone home

For stationary backup: The unit lives in one spot. You want the most hours of fridge, freezer, lights, internet, and devices you can get for $599, someone is home during use, and you do not need app scheduling.
50% more energy for the same money — 1536Wh vs 1024Wh, $0.39 per watt-hour vs $0.58. Testing documented it as an endurance product: fridge, chest freezer, fans, and TV ran through a multi-day outage with solar top-up.
Quieter in practice, and that is a reversal. Despite having no published noise spec, owners call the 1500 nearly silent holding a fridge at 50–150W. The Plus — which publishes a 30dB figure — runs its fan near-constantly under 600W per testing, which calls the imperceptible claim oversold. For 24/7 fridge duty in a living space, the less-premium unit is the quieter one.
Lower phantom draw. The Plus idles at a heavy ~32–40W — nearly double the DELTA 2. The 1500 runs DELTA 2-generation internals, so its standby drain is roughly half that. Over weeks of always-on standby, that gap compounds in the 1500’s favor.
No documented thermal throttle at sustained high draw. The Plus showed a thermal shutdown at sustained ~1573W in testing, a roughly 25% effective-capacity hit, and a measured surge of only ~2600W vs the 3600W spec. The 1500 showed no such pattern and absorbed a 550W compressor inrush cleanly.
Usable capacity at continuous low-to-moderate draw: approximately 1,300–1,380Wh, derived from the 1536Wh pack — testing gives runtime anecdotes, not a timed bench figure.
Why not the Plus: For a parked unit, its marquee features — dual solar, fast recharge, light weight — go unused, while its heavy idle draw and constant low-load fan become daily liabilities. You would pay the same $599 for 512Wh less runtime and a noisier, thirstier standby box.
One real limit on the 1500 for this role: If your backup plan involves keeping it topped from solar while also drawing grid power during a long outage, the 1500 cannot combine AC and solar reliably due to the documented bug. If that matters, it tips you toward the Plus despite the capacity loss.

Daily cycling for years — longevity is the priority

For repeated daily cycling: You charge and discharge the unit most days — daily solar cycling, a battery you lean on routinely — and you want it to still hold strong capacity years out.
4,000 cycles to 80% retention vs the 1500’s 3,000 cycles to 70% retention. That is both more cycles and a higher retention floor. Our research calls this the best cycle life in EcoFlow’s portable family, competitive with longevity-focused rivals.
The retention metric is the real story. After a decade of daily cycling, the 1500 is specified to fall to 70% of original capacity; the Plus holds 80%. The 1500’s own testing flags this explicitly and warns against the 25% above industry standard marketing, which counts cycles, not retention.
Usable capacity at light-to-moderate loads: starts at approximately 870–920Wh and degrades slower — the point of this segment is the slope, not the starting value.
Why not the 1500: Its larger 1536Wh pack means more runtime today, but it is specified to degrade further and faster. For a buyer whose whole use case is heavy repeated cycling, the retention gap outweighs the day-one capacity edge.
Honest caveat for both: These are manufacturer specs — no independent long-term degradation testing exists for either unit yet, so treat the gap as a spec-level expectation, not a measured outcome.

Smart-home control — Time-of-Use, usage graphs, API, Home Assistant

For app intelligence and automation: You want Time-of-Use scheduling, historical usage graphs, an API, Home Assistant integration — or you are buying to shave peak-rate electricity costs.
The 1500 physically lacks the software. Running the DELTA 2 stack, it has no Time-of-Use scheduling, no usage graphs, and no working official API — EcoFlow’s official API rejects the unit; only the DELTA 2 Private API works, and Home Assistant integration fails through official channels. One owner returned a 1500 and bought a Plus specifically to get Time-of-Use and graphs working.
But the Plus’s Time-of-Use is itself broken. The Plus has the feature, yet testing documents it discharging during medium-cost hours instead of peak, needing app refreshes to function, and forcing technical owners into Home Assistant and Node-RED workarounds. If your sole goal is automated peak-rate cost-shaving, neither unit delivers it as sold — the 1500 cannot, and the Plus does it unreliably.
What the Plus does deliver: working usage graphs, a functioning API, broad expansion compatibility (XT150 accepts DELTA 3, DELTA 2, DELTA 2 Max, and DELTA Pro 3 batteries), and Smart Generator 3000 auto start/stop for extended runtime.
Bottom line for this buyer: Between the two, the Plus — it is the only one with the DELTA 3 software at all. But size your expectations: for general monitoring, scheduling, and expansion it is the clear pick; for guaranteed peak-shaving automation, neither is trustworthy today, and a smart plug on the AC input is the honest workaround.

True of both units — Neither unit runs 240V, full-size space heaters, or window air conditioners. Both are 120V-only inverters. The X-Boost feature — rated to 2200W — uses voltage reduction and works only on resistive loads; the true inverter ceiling is 1800W on both units.

Common questions

The bottom line

Same $599, opposite jobs. The DELTA 3 Plus wins for mobile use — 27.6 lbs, double the solar input, ~55-minute recharge, and validated on extended road trips. It wins for daily cycling over years — 4,000 cycles to 80% retention vs the 1500’s 3,000 cycles to 70%. It wins for smart-home control — the only one with the DELTA 3 software stack at all, though Time-of-Use scheduling is unreliable on both. The DELTA 3 1500 wins for stationary backup — 50% more energy for the same money, quieter at fridge loads despite no published noise spec, lower standby drain, and no documented thermal throttle at sustained high draw. The Plus is the better moving, cycling, connected unit. The 1500 is the better parked, capacity-bound, leave-it-alone unit. If you carry it or cycle it hard, buy the Plus. If it lives in one spot and you want maximum runtime per dollar, buy the 1500.