Dual-voltage comparison
DELTA Pro 3 vs DELTA Pro and two 120 V alternatives: where the split matters
When a backup plan includes 240 V equipment, choosing among portable stations becomes more than a capacity comparison. The DELTA Pro 3 is the only single station in this four-model comparison with a documented US split-phase 240 V output. The older DELTA Pro also has a 3,600 W inverter, but its US single-station output is 120 V. The DELTA 3 Ultra Plus and Max Plus are smaller 120 V alternatives for a carefully selected load list.
Compare the base station first
| US model | Base battery | Rated AC output | Solar input | Approx. station weight | Voltage choice |
|---|---|---|---|---|---|
| DELTA Pro 3 | 4,096 Wh LFP | 4,000 W; 8,000 W surge | 2,600 W total across two differently rated inputs | 113.5 lb | 120 V or 120/240 V split-phase; output controls cannot operate together |
| DELTA Pro | 3,600 Wh LFP | 3,600 W; 7,200 W surge | 1,600 W maximum | 99 lb | 120 V from one station; Double Voltage Hub is separate |
| DELTA 3 Ultra Plus | 3,072 Wh LFP | 3,600 W; 7,200 W surge | 1,600 W total across two 800 W inputs | 74.3 lb | 120 V only |
| DELTA 3 Max Plus | 2,048 Wh LFP | 3,000 W; 6,000 W surge | 1,000 W maximum | 48.7 lb | 120 V only |
These are manufacturer specifications, not load tests. Surge is not continuous output; each station also has individual outlet and temperature limits. The older DELTA Pro’s 240 V charging input does not give it 240 V AC output. A 240 V receptacle matters only if your appliance requires 240 V, and the Pro 3’s high- and low-voltage output controls cannot be enabled together. If you need only 120 V, the Pro 3’s dual-voltage feature may add weight and expense without solving a real constraint.
Expansion is not the same as output
The DELTA Pro 3 has a clearly identified expansion path with one 4,096 Wh Extra Battery, for an 8,192 Wh package, or two packs, which EcoFlow lists as 12.2 kWh. The AC ceiling remains 4,000 W; more battery lengthens possible use but does not start a bigger appliance. The Ultra Plus can use one 2,048 Wh DELTA 3 Max Plus Smart Extra Battery, bringing its nameplate plan to 5,120 Wh, while its AC output remains 3,600 W. The Max Plus has one concrete 2,048 Wh EF-DL3-MP-EB option for a 4,096 Wh nameplate total; larger advertised system arrangements need their exact adapters and topology checked. Do not count a pack unless the exact station suffix and bundle are confirmed.
The Pro 3 is the clear choice when single-station split-phase 240 V, 4,000 W output or a documented 8–12.2 kWh one-unit arrangement is essential. The older DELTA Pro remains a 120 V alternative with 3,600 W output and a documented 7,200 Wh one-battery or 10,800 Wh two-battery arrangement. Its manual lists a separate Double Voltage Hub, but the exact multi-station wiring arrangement is not represented as a 240 V match here. The Ultra Plus can be a better 120 V fit when its dual 800 W solar inputs, Anderson DC output or documented battery option matter. The Max Plus is the lightest of these four and still has a 3,000 W inverter, but its smaller battery and lower solar ceiling demand a narrower plan.
Do not overlook handling and connections
Even the Max Plus weighs almost 49 lb, and the Ultra Plus weighs more than 74 lb; neither is an easy carry for many people. The Pro 3’s wheels help on a smooth level surface, but its 113.5 lb mass can make stairs, a vehicle lift and storage placement difficult. The Ultra Plus has a 378 W shared 12 V section, including an Anderson port and a 126 W car-style socket; the Pro 3 has a 378 W Anderson/DC5521 section but no cigarette-lighter outlet. The Max Plus has different DC connector limits. Check the plug and current your device requires rather than relying on a total DC wattage.
Solar maximums are electrical ceilings, not forecasts. The Pro 3’s high- and low-PV ports have different voltage and current windows; a panel kit must fit one of those inputs. For any model, identify the actual appliance draw, start-up requirement and hours of use, then check what the battery can deliver through the required outlet. Keep each station dry and ventilated, and use manufacturer-compatible transfer equipment for home circuits rather than backfeeding an outlet.
Which direction to take
Start with the DELTA Pro 3 assessment if any essential load requires 240 V, or if the 4,000 W AC rating and named expansion bundles answer a specific need. Read the DELTA Pro review for the older, single-station 120 V configuration. Then compare the DELTA 3 Ultra Plus review for the 120 V alternative with more base storage and 1,600 W solar input, and the DELTA 3 Max Plus review for the lower-weight, lower-capacity option. When neither heavier station is necessary, compare the smaller DELTA 3 variants. In every case, select around your non-negotiable voltage first, then decide whether you need more runtime, recharge input or portability.