Capacity
Higher is better | Scale max: 6,144 Wh | Delta Pro Ultra leads
DELTA Pro 3 4,096 Wh
Delta Pro Ultra 6,144 Wh
Delta Pro Ultra: +2,048 Wh (+50.0%).
DELTA Pro 3 vs Delta Pro Ultra
VS
4,000W
Running power
6,000W
4,096 Wh
Battery
6,144 Wh
113.5 lbs
Weight
182.1 lbs
At a Glance
This comparison targets buyers shopping for a high-capacity home backup station with serious solar capability. The Delta Pro Ultra delivers 6000W of running power and 12,000W surge, outpacing the DELTA Pro 3's 4000W and 8000W figures by a wide margin.
That extra headroom shows in device compatibility: the Ultra powered 52 of 53 tested devices versus 48 for the Pro 3. Solar input tells a similar story, with the Ultra accepting up to 5600W and reaching a full charge in roughly 8 hours, while the Pro 3 tops out at 2600W and needs about 14.6 hours.
Battery capacity scales accordingly, jumping from 4096 Wh to 6144 Wh. The tradeoff is physical: the Ultra weighs 182.1 lbs compared to 113.5 lbs for the Pro 3, and its cycle rating is 3200 versus 4000, so the lighter unit edges ahead on longevity and portability.
Overall Winner
Delta Pro Ultra
Powers 52 of 53 tested devices vs 48 for DELTA Pro 3
Home backup: Delta Pro Ultra RV / mobile: DELTA Pro 3 Solar: Delta Pro Ultra
Delta Pro Ultra wins overall, but the best pick depends on your use case.
Choose DELTA Pro 3 if...
- + Portability matters (114 lbs vs 182)
Choose Delta Pro Ultra if...
- + You want faster solar recharging
- + You want broader device compatibility
- + You need all-day runtime headroom
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 3 4,000 W
Delta Pro Ultra 6,000 W
Delta Pro Ultra: +2,000 W (+50.0%).
Surge Power
Higher is better | Scale max: 12,000 W | Delta Pro Ultra leads
DELTA Pro 3 8,000 W
Delta Pro Ultra 12,000 W
Delta Pro Ultra: +4,000 W (+50.0%).
Weight
Lower is better | Scale best: 113.5 lbs | DELTA Pro 3 leads
DELTA Pro 3 113.5 lbs (51.5 kg)
Delta Pro Ultra 182.1 lbs (82.6 kg)
DELTA Pro 3: -68.6 lbs (37.7% lighter).
Battery Life
Higher is better | Scale max: 4,000 cycles | DELTA Pro 3 leads
DELTA Pro 3 4,000 cycles
Delta Pro Ultra 3,200 cycles
DELTA Pro 3: +800 cycles (+25.0%).
Where Compatibility Actually Differs
Out of 53 devices tested, 4 show a different result between these two stations.
Both can run: 48 · Differences: 8% (4/53) · Neither can run: 1
Only Delta Pro Ultra can run 4
Neither can run · 1 devices
These devices exceed both stations on running power and surge.
Central AC (3-Ton)
Full Specs Comparison
| Spec | DELTA Pro 3 | Delta Pro Ultra |
|---|---|---|
| Capacity | 4,096 Wh | 6,144 Wh ✓ |
| Running Power | 4,000 W | 6,000 W ✓ |
| Surge Power | 8,000 W | 12,000 W ✓ |
| Weight | 113.5 lbs (51.5 kg) ✓ | 182.1 lbs (82.6 kg) |
| Energy Density | 79.5 Wh/kg ✓ | 74.4 Wh/kg |
| Portability Tier | stationary | stationary |
| Chemistry | LFP | LFP |
| Cycle Life | 4,000 ✓ | 3,200 |
| Expandable | Yes | Yes |
| UPS | No | No |
| AC Voltage | 120V/240V | 120V/240V |
Solar Charging
Best-case charging profile using compatible solar panels.
DELTA Pro 3
Max solar input 2,600 W
Connector XT60 + XT60i
Full charge time ~14.6h
Compatible panels 20/20
MPPT: 30-150V
Delta Pro Ultra
Faster Max solar input 5,600 W
Connector MC4
Full charge time ~8.0h
Compatible panels 20/20
MPPT: 80-450V
Charge speed comparison
Longer bar = faster charge (inverted scale)
Device Compatibility
All tested devices grouped by category. Click a category to expand.
DELTA Pro 3Delta Pro Ultra
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 3 | Runtime | Delta Pro Ultra | Runtime |
|---|---|---|---|---|
| Box Fan (20-inch) | Safe | 34.5h | Safe | 51.8h |
| Central AC (3-Ton) | Fail | N/A | Fail | N/A |
| Dehumidifier (70 Pint) | Safe | 3.3h | Safe | 5h |
| Gas Furnace Fan (Blower) | Safe | 2.7h | Safe | 4.1h |
| Portable AC (12,000 BTU) | Safe | 2.1h | Safe | 3.2h |
| Space Heater (1,500W) | Safe | 1.9h | Safe | 2.9h |
| Window AC (8,000 BTU) | Safe | 4h | Safe | 6.1h |
Home Infrastructure(3)
2/33/3
2/3
3/3
Kitchen Appliances(11)
11/1111/11
11/11
11/11
| Device | DELTA Pro 3 | Runtime | Delta Pro Ultra | Runtime |
|---|---|---|---|---|
| 2-Slice Bread Toaster | Safe | 1.9h | Safe | 2.9h |
| Coffee Maker | Safe | 1.8h | Safe | 2.7h |
| Digital Air Fryer | Safe | 1.7h | Safe | 2.5h |
| Electric Skillet | Safe | 1.9h | Safe | 2.9h |
| Electric Stove (Single Burner) | Safe | 1.6h | Safe | 2.4h |
| Electric Water Kettle | Safe | 1.9h | Safe | 2.9h |
| Instant Pot (6 Qt) | Safe | 2h | Safe | 2.9h |
| Microwave Oven (1000W) | Safe | 1.5h | Safe | 2.2h |
| Rice Cooker | Safe | 3h | Safe | 4.6h |
| Slow Cooker | Safe | 9.6h | Safe | 14.3h |
| Toaster Oven | Safe | 1.6h | Safe | 2.4h |
Large Appliances(4)
3/44/4
3/4
4/4
Medical(4)
4/44/4
4/4
4/4
Outdoor & RV(6)
5/66/6
5/6
6/6
Personal Care(2)
2/22/2
2/2
2/2
Power Tools(5)
4/55/5
4/5
5/5
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The Bottom Line
The DELTA Pro 3 suits buyers who want strong whole-home backup in a comparatively lighter package, with 4000 rated cycles extending its useful life. The Delta Pro Ultra is the better fit for households running heavy loads or prioritizing fast solar recharge at 5600W input.
With a compatibility score of 102 versus 96 and coverage of nearly every device tested, the Delta Pro Ultra earns the overall recommendation. In our 53-device benchmark, DELTA Pro 3 powers 48 devices and Delta Pro Ultra powers 52.
DELTA Pro 3 vs Delta Pro Ultra FAQ
Q Which is better for home backup, DELTA Pro 3 or Delta Pro Ultra?
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 3 or Delta Pro Ultra?
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 3 or Delta Pro Ultra?
DELTA Pro 3 is lighter at 113.5 lbs vs 182.1 lbs. DELTA Pro 3 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 48 for DELTA Pro 3.