Whole-home backup
DELTA Pro 3 vs F3800 Plus
Two portable whole-home contenders. We compare 240V output, surge, solar input, expansion, and the installation details that decide the job.
Best for heavy loadsAnker SOLIX F3800 Plus
3-4kWh home backup · Head-to-head
EcoFlow DELTA 3 Ultra Plus vs Anker SOLIX F3800 Plus: 240V or Value?
One is a 120V home-backup workhorse you can move. The other is a 240V transfer-switch platform that stays put. The install decides the buy.
Our pick · Best for 240V
Anker SOLIX F3800 Plus
The Anker SOLIX F3800 Plus is the stronger choice if you are wiring a 240V transfer switch or need 6,000W continuous. For a 120V setup, the EcoFlow DELTA 3 Ultra Plus delivers most of the usable energy for about $1,700 less, at 62 lb less weight. Buy the F3800 Plus for the electrical capability, not for the extra 0.8kWh.
6.5WattBench
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Quick take
Which one fits your loads?
Choose EcoFlow if
DELTA 3 Ultra Plus
- You are staying on 120V and want the lowest cost per usable watt-hour in the 3kWh class
- You need to move the station between rooms, a garage, and a vehicle
- 1,600W solar input and an 11.3kWh expansion path are enough for your plan
Choose Anker SOLIX if
F3800 Plus
- You are installing a 240V transfer switch, subpanel, or generator inlet
- You need 6,000W continuous and 12,000W surge for a well pump, HVAC, or multiple circuits
- You want a stationary platform that can expand to 53.8kWh with external batteries
Specifications
The numbers side by side
Green marks the stronger figure in that row. A stronger spec is not automatically the better product for your loads.
| Spec | EcoFlow DELTA 3 Ultra Plus | Anker SOLIX F3800 Plus |
|---|---|---|
| Rated capacity | 3,072 Wh | 3,840 Wh |
| Usable (85%) | 2,611 Wh | 3,264 Wh |
| Continuous output | 3,600 W | 6,000 W |
| Surge | 7,200 W | 12,000 W |
| Chemistry | LiFePO4 | LiFePO4 |
| Weight | 75 lb | 136.7 lb |
| AC input | 1,800 W | 1,800 W |
| Recharge time | ~1.7 hr (1,800W) | <3 hr (1,800W) |
| Solar input | 1,600 W | 3,200 W |
| Expansion | 11.3 kWh | 53.8 kWh |
| Warranty | 5 years | 5 years |
| Street price | $1,599–$2,399 | $3,599 |
| Cost / usable Wh | $0.73 | $1.10 |
Manufacturer-published figures, checked November 6, 2026. Usable energy uses our 85% rule. Green cells mark the stronger spec, not the better product for your loads.
WattBench score
How the two stations stack up
Weighted across six dimensions. The score is a starting point, not a verdict for your specific loads.
EcoFlow DELTA 3 Ultra Plus · 6.5/10Anker SOLIX F3800 Plus · 6.5/10
Capacity25%
Output20%
Portability15%
Recharge15%
Expandability10%
Value15%
Capacity 25%, output 20%, portability 15%, recharge 15%, expandability 10%, value 15%. Read the methodology.
The short version
These are both 3-4kWh LiFePO4 stations with five-year warranties and 1,800W AC charging. The similarity ends at the outlet. The DELTA 3 Ultra Plus is a 120V unit built to be moved. The F3800 Plus is a 120V/240V unit built to be installed.
If your backup plan is extension cords and a few essential circuits, the Ultra Plus is the better buy. If your plan starts at a transfer switch, the F3800 Plus is the only one of the two that can feed a 240V panel.
240V is the feature that changes the install
The F3800 Plus can deliver 240V split-phase output, which is what a transfer switch or subpanel needs for a well pump, electric dryer, or central air conditioner. The DELTA 3 Ultra Plus is 120V-only. That does not make it weak; it makes it a different class of installation.
A 240V transfer switch, inlet box, and subpanel require proper equipment and licensed work. Do not treat a portable station's 240V outlet as a DIY shortcut. The station also needs to be sized for the surge of every motor on the circuit, not just the running watts.
If you are not installing a transfer switch, the 240V advantage disappears. Most apartment and small-home backup plans can run on 120V extension cords and a few carefully chosen circuits.
Capacity and runtime: 3.1kWh versus 3.8kWh
The DELTA 3 Ultra Plus stores 3,072Wh; the F3800 Plus stores 3,840Wh. At our 85% usable-energy factor, that is about 2,611Wh versus 3,264Wh. The F3800 Plus gives you roughly 25% more runtime.
At a 75W average fridge load, that is about 35 hours versus 44 hours. At a 1,000W load, it is about 2.6 hours versus 3.3 hours. At a 1,500W space heater, it is about 1.7 hours versus 2.2 hours.
The extra capacity is real, but it is not the main reason to pay the premium. The 240V output, higher continuous rating, and larger expansion ceiling are.
Portability: 75 lb versus 136.7 lb
The DELTA 3 Ultra Plus weighs 75 lb. That is a two-person lift for most people, but it can be moved between a closet, a garage, and a vehicle. The F3800 Plus weighs 136.7 lb and is best treated as a stationary appliance.
If the station needs to do double duty for camping, RV travel, or job sites, the Ultra Plus is far easier to live with. If it lives next to a transfer switch, weight matters much less.
Solar and expansion
The Ultra Plus accepts up to 1,600W of solar and expands to 11.3kWh. The F3800 Plus accepts up to 3,200W and expands to 53.8kWh with six batteries. The F3800 Plus is the stronger solar platform, but the panels and batteries are a separate budget.
For a one-day outage, a 400-800W array is a realistic supplement for either station. For multi-day independence, the F3800 Plus can grow into a small whole-home bank; the Ultra Plus can grow to a useful, but smaller, reserve.
Cost per usable watt-hour
At a $1,899 midpoint, the DELTA 3 Ultra Plus costs about $0.73 per usable watt-hour. At $3,599, the F3800 Plus costs about $1.10. You are paying roughly 51% more per usable watt-hour for the F3800 Plus.
That premium buys 240V output, 2,400W more continuous output, 62 lb more machine, and a much larger expansion ceiling. If those map to your installation, the premium is justified. If you only need 120V essentials, it is not.
Which should you buy?
Buy the DELTA 3 Ultra Plus if you are building a 120V backup kit, want to move the station, and would rather put the savings into solar panels or a second battery. It has enough output for a fridge, a microwave, a CPAP, and most small pumps.
Buy the F3800 Plus if a 240V transfer switch is already part of the plan, or if you need 6,000W continuous for a large well pump or multiple circuits. It is a home-backup platform first and a portable station second.
Runtime math
How long each station lasts
Same formula for both: rated capacity x 0.85, divided by the load. Real appliances cycle, so treat these as planning estimates.
| Load | Average draw | DELTA 3 Ultra Plus | F3800 Plus |
|---|---|---|---|
| Refrigerator (avg.) | 75 W | 35 hr | 44 hr |
| CPAP (no humidifier) | 40 W | 2.7 days | 3.4 days |
| Wi-Fi + laptop | 60 W | 44 hr | 2.3 days |
| Microwave | 1,000 W | 2.6 hr | 3.3 hr |
| Space heater | 1,500 W | 1.7 hr | 2.2 hr |
Estimates use 85% of rated capacity and a constant average load. Real appliances cycle; a fridge's duty cycle and ambient temperature change the result. Run your own numbers.
FAQ
Questions buyers actually ask
Does the DELTA 3 Ultra Plus have 240V output?
No. It is a 120V-only station. If you need 240V split-phase output for a transfer switch or subpanel, the F3800 Plus is the appropriate choice in this matchup.
Can the F3800 Plus run a well pump?
It has 6,000W continuous and 12,000W surge, so it can start many residential well pumps. Check the pump's locked-rotor amps and the transfer equipment rating before assuming it will work. A soft starter can reduce the startup load.
How much longer will the F3800 Plus run a fridge?
At a 75W average draw, about 44 hours versus 35 hours for the DELTA 3 Ultra Plus. Real fridge duty cycles, room temperature, and door openings will move both numbers.
Which station is easier to move?
The DELTA 3 Ultra Plus at 75 lb. The F3800 Plus is 136.7 lb and is best left in place near the transfer equipment.
Is the F3800 Plus worth $1,700 more?
Only if you will use 240V output, the higher continuous rating, or the larger expansion path. For a 120V essentials plan, the Ultra Plus is the better value.
Before you buy
Check the current price and bundle.
Street prices move. The price band on this page is a research snapshot, not a live quote. Verify the current price, included accessories, and warranty terms at the merchant.