4–3 on shared published metrics
EcoFlow DELTA 3 Ultra vs VTOMAN FlashSpeed Pro 3600
DELTA 3 Ultra leads on 4 of the 8 metrics both units publish; FlashSpeed Pro 3600 leads on 3; 5 are level or not directly comparable. Capacity is within 1%, so this is a like-for-like decision rather than a size mismatch.
Pick this if
EcoFlow DELTA 3 Ultra
- Weight: 72.1 lb vs 83.8 lb
- Watt-hours per pound: 42.6 Wh/lb vs 36.9 Wh/lb
- Max solar input: 3,200 W vs 800 W
- Warranty: 60 months vs 24 months
Buyers who want one system to grow from camping into home backup.
Pick this if
VTOMAN FlashSpeed Pro 3600
- Capacity: 3,096 Wh vs 3,072 Wh
- List price: $1,300 vs $1,399
- Cost per watt-hour: $0.42 vs $0.46
Drivers who mainly want jump-start capability plus basic backup power.
Spec by spec
A green arrow marks the better figure on each row. Rows where only one unit publishes a number are shown without a winner rather than guessed.
| Metric | DELTA 3 Ultra | FlashSpeed Pro 3600 | What it means |
|---|---|---|---|
| Capacity | 3,072 Wh | 3,096 Wh | How much energy the unit stores. Sets how long everything else can run. |
| Continuous AC output | 3,600 W | 3,600 W | The largest load the inverter will run continuously, not counting surge. |
| Weight lower is better | 72.1 lb | 83.8 lb | The spec buyers most often regret ignoring. |
| List price lower is better | $1,399 | $1,300 | Vendor list price at the time of collection; street prices move. |
| Cost per watt-hour lower is better | $0.46 | $0.42 | Price divided by capacity. The fairest single value metric. |
| Watt-hours per pound | 42.6 Wh/lb | 36.9 Wh/lb | Capacity you get per pound carried. |
| Max solar input | 3,200 W | 800 W | Caps how large an array is useful, and therefore off-grid recharge speed. |
| AC recharge time lower is better | — | 120 min | Vendor-stated time to full from a wall outlet. |
| Rated cycles | — | 3,000 cycles | Vendor claim for charge cycles before capacity degrades to 80%. |
| UPS switchover lower is better | — | 20 ms | How long the unit takes to switch to battery. Under 20 ms keeps a desktop alive. |
| Max expandable capacity | — | 5,912 Wh | How far the system can grow with add-on batteries. |
| Warranty | 60 months | 24 months | Stated warranty length from the vendor listing. |
How each one ranks overall
EcoFlow DELTA 3 Ultra
- #32 of 104 for Best value (cost per watt-hour) ($0.46)
- #21 of 103 for Most portable (Wh per pound) (42.6 Wh/lb)
- #60 of 106 for Most inverter headroom (117 W/100Wh)
- #4 of 83 for Highest solar input (3.2 kW)
- #44 of 103 for Most output per dollar (2.57 W/$)
- #33 of 106 for Best for home backup (67/100)
- #21 of 105 for Longest warranty (60 mo)
- #5 of 29 for Quietest under load (25 dB)
VTOMAN FlashSpeed Pro 3600
- #23 of 104 for Best value (cost per watt-hour) ($0.42)
- #52 of 103 for Most portable (Wh per pound) (36.9 Wh/lb)
- #72 of 106 for Most inverter headroom (116 W/100Wh)
- #2 of 49 for Fastest AC recharge (1.5 kW)
- #37 of 83 for Highest solar input (800 W)
- #20 of 36 for Most expandable (5.91 kWh)
- #17 of 96 for Longest service life (9288 kWh)
- #37 of 103 for Most output per dollar (2.77 W/$)
- #5 of 106 for Best for home backup (84/100)
- #97 of 105 for Longest warranty (24 mo)
The brands behind them
EcoFlow
The tech-forward buyer who reads the spec sheet and wants room to grow
Best for: Buyers who want one system to grow from camping into home backup.
Not for: Buyers who want the lowest cost per watt-hour and will never use an app.
Full EcoFlow profile →VTOMAN
The car owner who wants roadside rescue and backup power in one box
Best for: Drivers who mainly want jump-start capability plus basic backup power.
Not for: Buyers whose priority is a refined, well-supported power station.
Full VTOMAN profile →Where these numbers come from. Every figure on this page is taken from EcoFlow’s own product listing and is stored with the vendor’s exact wording, reproduced below. We do not estimate missing specs — a field the vendor does not publish is shown as “—” and excluded from rankings. Source: us.ecoflow.com/products/ecoflow-delta-3-ultra-portable-power-station-3072wh.
Vendor wording for each figure (5)
capacityWh: “Rated Capacity => 3072Wh 51.2V 60Ah”acOutputW: “3600W total (surge 7200W)”weight: “Net Weight => 32.7±0.6kg”solarInputW: “3200W Max”warrantyMonths: “5-Year Warranty”
Where these numbers come from. Every figure on this page is taken from VTOMAN’s own product listing and is stored with the vendor’s exact wording, reproduced below. We do not estimate missing specs — a field the vendor does not publish is shown as “—” and excluded from rankings. Source: vtoman.com/products/vtoman-flashspeed-pro-3600-power-station.
Vendor wording for each figure (9)
capacityWh: “Battery Capacity => 3096Wh”acOutputW: “Product Name => VTOMAN FlashSpeed Pro 3600 Continuous Power 3x2200W + 1x3600W, total 3600W”weight: “Weight => 38 kg (83.8 lbs)”solarInputW: “Supports up to 1800W AC input or 800W solar input”rechargeAcMinutes: “fully recharges from 0% to 100% in just 2 hours via a standard AC wall outlet”cycleLife: “ensuring over 3,000 cycles”upsSwitchoverMs: “switching over in under 20ms”maxExpandableWh: “Expandable Capacity up to 5912Wh”warrantyMonths: “24‑month warranty”
