Capacity
Higher is better | Scale max: 6,144 Wh | Delta Pro Ultra leads
Delta Pro Ultra 6,144 Wh
Yeti Pro 4000 3,993.6 Wh
Delta Pro Ultra: +2,150 Wh (+53.8%).
Delta Pro Ultra vs Yeti Pro 4000
VS
6,000W
Running power
3,600W
6,144 Wh
Battery
3,993.6 Wh
182.1 lbs
Weight
115.7 lbs
At a Glance
This comparison targets buyers shopping for a high-capacity LFP power station that can handle whole-home backup or serious off-grid use. The Delta Pro Ultra delivers 6000W of running power and 6144 Wh of capacity, nearly doubling the Yeti Pro 4000's 3600W output and 3993.6 Wh reserve.
That extra headroom shows in device compatibility testing: the EcoFlow unit powered 52 out of 53 devices, while the Goal Zero model covered 47 of 53. Solar recharge speed also favors the Delta Pro Ultra, with a 5600W max input that can refill the larger battery in roughly 8 hours compared to 14.3 hours for the Yeti Pro 4000 at 3000W input.
The tradeoff is weight and longevity. At 115.7 lbs versus 182.1 lbs, the Yeti is meaningfully easier to move, and its 4000-cycle rating outlasts the Delta Pro Ultra's 3200 cycles.
Overall Winner
Delta Pro Ultra
Powers 52 of 53 tested devices vs 47 for Yeti Pro 4000
Home backup: Delta Pro Ultra RV / mobile: Yeti Pro 4000 Solar: Delta Pro Ultra
Delta Pro Ultra wins overall, but the best pick depends on your use case.
Choose Delta Pro Ultra if...
- + You want faster solar recharging
- + You need 240V-capable loads
- + You want broader device compatibility
- + You need all-day runtime headroom
Choose Yeti Pro 4000 if...
- + Portability matters (116 lbs vs 182)
Spec Snapshot
Absolute values shown. Bars are scaled within this comparison for readability.
Each metric is independent. Bar lengths are not comparable across different compare pages.
Running Power
Higher is better | Scale max: 6,000 W | Delta Pro Ultra leads
Delta Pro Ultra 6,000 W
Yeti Pro 4000 3,600 W
Delta Pro Ultra: +2,400 W (+66.7%).
Surge Power
Higher is better | Scale max: 12,000 W | Delta Pro Ultra leads
Delta Pro Ultra 12,000 W
Yeti Pro 4000 7,200 W
Delta Pro Ultra: +4,800 W (+66.7%).
Weight
Lower is better | Scale best: 115.7 lbs | Yeti Pro 4000 leads
Delta Pro Ultra 182.1 lbs (82.6 kg)
Yeti Pro 4000 115.7 lbs (52.5 kg)
Yeti Pro 4000: -66.4 lbs (36.4% lighter).
Battery Life
Higher is better | Scale max: 4,000 cycles | Yeti Pro 4000 leads
Delta Pro Ultra 3,200 cycles
Yeti Pro 4000 4,000 cycles
Yeti Pro 4000: +800 cycles (+25.0%).
Where Compatibility Actually Differs
Out of 53 devices tested, 5 show a different result between these two stations.
Both can run: 47 · Differences: 9% (5/53) · Neither can run: 1
Only Delta Pro Ultra can run 5
Electric Water Heater (50 Gal) Yeti Pro 4000: Voltage mismatch
Well Pump (1 HP) Yeti Pro 4000: Voltage mismatch
Electric Clothes Dryer Yeti Pro 4000: Voltage mismatch
RV Rooftop AC (13,500 BTU) Yeti Pro 4000: Needs soft-start
Pancake Air Compressor (6-Gallon) Yeti Pro 4000: Needs soft-start
Neither can run · 1 devices
These devices have startup surges that exceed both stations.
Central AC (3-Ton)
Full Specs Comparison
| Spec | Delta Pro Ultra | Yeti Pro 4000 |
|---|---|---|
| Capacity | 6,144 Wh ✓ | 3,993.6 Wh |
| Running Power | 6,000 W ✓ | 3,600 W |
| Surge Power | 12,000 W ✓ | 7,200 W |
| Weight | 182.1 lbs (82.6 kg) | 115.7 lbs (52.5 kg) ✓ |
| Energy Density | 74.4 Wh/kg | 76.1 Wh/kg ✓ |
| Portability Tier | stationary | stationary |
| Chemistry | LFP | LFP |
| Cycle Life | 3,200 | 4,000 ✓ |
| Expandable | Yes | Yes |
| UPS | No | No |
| AC Voltage | 120V/240V | 120V |
Solar Charging
Best-case charging profile using compatible solar panels.
Delta Pro Ultra
Faster Max solar input 5,600 W
Connector MC4
Full charge time ~8.0h
Compatible panels 20/20
MPPT: 80-450V
Yeti Pro 4000
Max solar input 3,000 W
Connector Proprietary + DC7909
Full charge time ~14.3h
Compatible panels 20/20
MPPT: 13.3-145V
Charge speed comparison
Longer bar = faster charge (inverted scale)
Device Compatibility
All tested devices grouped by category. Click a category to expand.
Delta Pro UltraYeti Pro 4000
Emergency(2)
2/22/2
2/2
2/2
Entertainment(2)
2/22/2
2/2
2/2
EV & Transportation(2)
2/22/2
2/2
2/2
Heating & Cooling(7)
6/76/7
6/7
6/7
| Device | Delta Pro Ultra | Runtime | Yeti Pro 4000 | Runtime |
|---|---|---|---|---|
| Box Fan (20-inch) | Safe | 51.8h | Safe | 33.7h |
| Central AC (3-Ton) | Fail | N/A | Voltage Fail | N/A |
| Dehumidifier (70 Pint) | Safe | 5h | Safe | 3.3h |
| Gas Furnace Fan (Blower) | Safe | 4.1h | Safe | 2.6h |
| Portable AC (12,000 BTU) | Safe | 3.2h | Safe | 2.1h |
| Space Heater (1,500W) | Safe | 2.9h | Safe | 1.9h |
| Window AC (8,000 BTU) | Safe | 6.1h | Safe | 3.9h |
Home Infrastructure(3)
3/31/3
3/3
1/3
| Device | Delta Pro Ultra | Runtime | Yeti Pro 4000 | Runtime |
|---|---|---|---|---|
| Electric Water Heater (50 Gal) | Tight | 0.8h | Voltage Fail | N/A |
| Garage Door Opener (Residential) | Safe | 23.9h | Safe | 15.5h |
| Well Pump (1 HP) | Safe | 1.8h | Voltage Fail | N/A |
Kitchen Appliances(11)
11/1111/11
11/11
11/11
| Device | Delta Pro Ultra | Runtime | Yeti Pro 4000 | Runtime |
|---|---|---|---|---|
| 2-Slice Bread Toaster | Safe | 2.9h | Safe | 1.9h |
| Coffee Maker | Safe | 2.7h | Safe | 1.7h |
| Digital Air Fryer | Safe | 2.5h | Safe | 1.6h |
| Electric Skillet | Safe | 2.9h | Safe | 1.9h |
| Electric Stove (Single Burner) | Safe | 2.4h | Safe | 1.6h |
| Electric Water Kettle | Safe | 2.9h | Safe | 1.9h |
| Instant Pot (6 Qt) | Safe | 2.9h | Safe | 1.9h |
| Microwave Oven (1000W) | Safe | 2.2h | Safe | 1.5h |
| Rice Cooker | Safe | 4.6h | Safe | 3h |
| Slow Cooker | Safe | 14.3h | Safe | 9.3h |
| Toaster Oven | Safe | 2.4h | Safe | 1.6h |
Large Appliances(4)
4/43/4
4/4
3/4
Medical(4)
4/44/4
4/4
4/4
Outdoor & RV(6)
6/65/6
6/6
5/6
Personal Care(2)
2/22/2
2/2
2/2
Power Tools(5)
5/54/5
5/5
4/5
As an Amazon Associate, we earn from qualifying purchases. Our methodology
The Bottom Line
Buyers who need maximum output for home backup, large appliances, or fast solar charging should pick the Delta Pro Ultra. The Yeti Pro 4000 makes more sense for anyone who values a lighter form factor and longer cycle life over raw wattage.
With a score of 102 to 95 and broader device coverage, the Delta Pro Ultra is the stronger overall pick in this matchup. In our 53-device benchmark, Delta Pro Ultra powers 52 devices and Yeti Pro 4000 powers 47.
Delta Pro Ultra vs Yeti Pro 4000 FAQ
Q Which is better for home backup, Delta Pro Ultra or Yeti Pro 4000?
Delta Pro Ultra is the stronger overall choice in this matchup based on weighted compatibility across 53 tested devices.
Q Which has longer runtime, Delta Pro Ultra or Yeti Pro 4000?
Delta Pro Ultra has higher battery capacity (6,144 Wh), which generally supports longer runtime on the same load.
Q Which charges faster with solar panels?
Delta Pro Ultra has the faster best-case solar recharge profile in our panel compatibility test set.
Q Which is more portable, Delta Pro Ultra or Yeti Pro 4000?
Yeti Pro 4000 is lighter at 115.7 lbs vs 182.1 lbs. Yeti Pro 4000 is rated stationary for portability.
Q How many devices can each power station run?
Delta Pro Ultra powers 52 of 53 tested devices, compared to 47 for Yeti Pro 4000.