1
Voltage Gate
PASSDevice output type must match generator output.
120V required -> 120V/240V available
Yes, the DELTA Pro 3 can run a Box Fan (20-inch)
Yes - DELTA Pro 3 has enough running and surge power for the Box Fan (20-inch). Target ~96W running / 191W surge; the generator provides 4000W / 8000W.
Power Margin Analysis
4000W / 8000W Capacity Running 3904W headroom
96W required
Surge 7809W headroom
191W required
Decision Gate Waterfall
Same decision gates as the engine: voltage, running, surge. Runtime is shown as operational context.
2
Running Gate
PASSContinuous draw with safety buffer applied.
96W required -> 4,000W available (3,904W headroom)
Required 96W required
Available 4,000W
3
Surge Gate
PASSStartup peak with safety buffer applied.
191W required -> 8,000W available (7,809W headroom)
Required 191W required
Available 8,000W
4
Runtime Insight
INFORuntime context only. It does not change the electrical compatibility verdict.
Continuous estimate: 34.5h
Device profile reference: up to 8h per day.
Power bars show required versus available output for each gate.
View full compatibility reportDecision Snapshot
Quick compatibility, required headroom, and model-specific context at a glance.
⚡
4000W
Running Power
🔋
4096Wh
Capacity
⏱️
~34.5h
Est. Runtime
☀️
2600W
Solar Input
Quick Compatibility Check
- 1 Running headroom: target 96W; generator provides 4000W.
- 2 Surge headroom: target 191W; generator provides 8000W.
- 3 Tip: leave headroom for startup spikes and warm conditions.
Model-Specific Results
3 of 3 models are SAFE or TIGHT. Most demanding model: Lasko B20200 (20-inch Box Fan) (166W surge).
| Model | Running | Surge | Verdict | Runtime | Source |
|---|---|---|---|---|---|
| Lasko B20200 (20-inch Box Fan) | 83W | 166W | Safe | ~34.5h | Engineering Est. |
Show expert analysisTechnical: **Running load:** 83 W. **Surge:** 166 W (estimated 2x startup for shaded-pole motor). **Voltage:** 120 V AC. Small shaded-pole fan motors produce a brief inrush at startup that is typically 2x running — far less than the 3x NEC standard for larger motors. Field note: Box fans are among the easiest appliances to run off-grid. Even with the 2x startup surge, any power station rated 200W+ handles this fan comfortably. Will this fan drain my power station quickly? At 83W continuous, an 8-hour overnight run consumes ~664 Wh. A 1000Wh power station handles it with margin to spare. | |||||
| Lasko B20500 (20-inch Box Fan) | 72W | 144W | Safe | ~39.8h | Engineering Est. |
Show expert analysisTechnical: **Running load:** 72 W. **Surge:** 144 W (estimated 2x startup). **Voltage:** 120 V AC. Slightly lower draw than the B20200 — same motor technology, lower speed setting or blade design. Field note: At 72W, this is the lightest box fan in the comparison. Perfect for overnight use on a portable power station — a 500Wh unit runs it for nearly 7 hours. Can I run this fan overnight on a 500 Wh power station? Close — 8 hours at 72W needs 576 Wh. With inverter losses (~70% usable), a 500Wh station runs it for about 5 hours. A 750Wh+ station covers a full night. | |||||
| Lasko 3733 (20-inch Box Fan) | 80W | 160W | Safe | ~35.8h | Engineering Est. |
Show expert analysisTechnical: **Running load:** 80 W (high speed, top of 50-80W range). **Surge:** 160 W (estimated 2x startup). **Voltage:** 120 V AC. Variable speed range means actual draw depends on setting — low speed draws as little as 50W. Field note: If running on battery, use a lower speed setting. Dropping from high (80W) to low (50W) extends runtime by 60% — a meaningful difference on a single charge. How long can I run this fan on low speed? At 50W on low speed, a 1000Wh power station (700Wh usable) runs it for about 14 hours. High speed (80W) cuts that to about 9 hours. | |||||
How This Pairing Performs Across Our Database
This unit ranks #30 of 33 compatible generators for this device by buffered margin (Overkill class).
How Box Fan (20-inch) Performs Across 33 Tested Generators
33 of 33 generators are SAFE+TIGHT for Box Fan (20-inch).
33
Safe+Tight
Safe 33 (100%)
Power Comparison: EcoFlow DELTA Pro 3 vs Top Alternatives for Box Fan (20-inch)
EcoFlow DELTA Pro 3 Safe Overkill
Current unit
Running 4,000W
Surge 8,000W
Fit class uses buffered needs (running and surge) for this device.
Specs & Surge Analysis
Heating & Cooling
Box Fan (20-inch)
Hot Weather Ventilation
Select Your Model:
83W
Running
166W
Surge
120V
Required
True Surge™ Analysis
Safety Buffer: +15% Running Power Usage 2% Utilization
96W required 4000W Capacity
3904W headroom
Surge/Startup Peak 2% Utilization
191W required 8000W Capacity
7809W headroom
Voltage Match 120V ↔ 120V/240V ✓
⚠️
Before You Buy: Connection Check
Installation warning
These systems are often hardwired to a home panel. To run them from a portable station, you may need a transfer switch installed by an electrician. You cannot just plug it in.
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Generator Insights
The 8000W surge rating can support typical compressor startup in residential air conditioners, well pumps, and refrigeration equipment. Most single-phase motor loads under 2HP can start on this surge budget. The 4000W continuous capacity can handle simultaneous operation of multiple circuits including HVAC blowers, lighting, and standard appliances during extended outages.
This unit provides 4096Wh of LFP battery capacity with 4000W continuous and 8000W surge output capability. Source: EcoFlow DELTA Pro 3 User Manual v1.1 (AC Output Specifications) (manufacturer documentation). The LFP chemistry offers thermal stability compared to older lithium-ion chemistries, though all battery systems require proper ventilation and adherence to installation guidelines.
Extend Runtime with Solar
Keep your Box Fan (20-inch) running with solar • MPPT: 30– 150V • Max: 2600W
Official EcoFlow
400W Panel
1 Hour Sun =
Runs Indefinitely
MC4 -> XT60
Full in ~14.6h Adapter required: MC4 -> XT60.
Smart Value Anker
400W Panel
1 Hour Sun =
Runs Indefinitely
MC4 -> XT60
Full in ~14.6h Adapter required: MC4 -> XT60.
Smart Value Bluetti
350W Panel
1 Hour Sun =
Runs Indefinitely
MC4 -> XT60
Full in ~16.7h Adapter required: MC4 -> XT60.
Technical Analysis
Spec-Based • No GuaranteesTechnical Breakdown
Running load: 83 W (worst case). Surge: 166 W (2x startup, small fan motor policy for shaded-pole motors). Voltage: 120 V AC required. Box fans use small shaded-pole motors with a brief 2x inrush at startup — much lower than the 3x NEC standard for larger motors.
Expected Behavior
Estimated runtime: ~34.5h. Draws 72-83W steady depending on model. 8 hours daily operation consumes 576-664 Wh. Startup inrush is brief (<1 second) and typically 2x running.
Field Note
Box fans are ideal off-grid appliances. Low running watts, minimal surge, and long daily use. Size your power station for runtime (capacity in Wh), not wattage — any 200W+ station handles the load.
Frequently Asked Questions
Can the EcoFlow DELTA Pro 3 power a Box Fan (20-inch)?
Yes. The EcoFlow DELTA Pro 3 provides 4000W running / 8000W surge. The Box Fan (20-inch) needs 96W / 191W (including 15% buffer). That leaves 3904W of running headroom and 7809W of surge margin.
How long will the DELTA Pro 3 run a Box Fan (20-inch)?
Approximately 34.5 hours, based on the Box Fan (20-inch)'s 83W draw and the DELTA Pro 3's 4096Wh capacity (70% usable after real-world losses).
What Else Can You Run?
With 1330W allocated to the Box Fan (20-inch), the DELTA Pro 3 still has ~1787W of margin. These devices could run simultaneously:
💡
LED Lamp
10W
🔥
Space Heater (Eco)
750W
🌀
Box Fan (Medium)
60W
📺
55' LED TV
80W
🎮
Gaming Laptop
230W
🥘
Slow Cooker
200W
Power Tip: To get the most out of your DELTA Pro 3, keep it in a well-ventilated area. Extreme temperatures can slightly reduce the efficiency of the LFP/NMC cells.
Compare all 33 generators for the Box Fan (20-inch)
Ranked by budget, runtime, and overall compatibility.
Technical Sourcing & Verification
ID: ecoflow-delta-pro-3-box-fan-20inch 🏛️ Device Data Source
Engineering Est. Safety Factor Applied
Derived from variant list (max of variants). Running worst case = Lasko B20200 (83W OEM). Surge worst case = Lasko B20200 (166W). Small fan motor policy: 2x startup for shaded-pole motors.
⚡ Generator Specs Source
OEM Verified
EcoFlow DELTA Pro 3 User Manual v1.1 (AC Output Specifications)
Methodology informed by US Department of Energy (DOE) & EIA references where applicable.
Our methodology →
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