1
Voltage Gate
PASSDevice output type must match generator output.
120V required -> 120V available
Yes, the DELTA 2 Max can run a Sump Pump
This pairing clears the safety headroom. Required ~1297W running and 3889W surge; the DELTA 2 Max is rated 2400W / 4800W.
Power Margin Analysis
2400W / 4800W Capacity Running 1103W headroom
1297W required
Surge 911W headroom
3889W 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.
1,297W required -> 2,400W available (1,103W headroom)
Required 1,297W required
Available 2,400W
3
Surge Gate
PASSStartup peak with safety buffer applied.
3,889W required -> 4,800W available (911W headroom)
Required 3,889W required
Available 4,800W
3b
With Soft-Start
PASSAlternative startup path with reduced inrush.
1,750W required -> 4,800W available (3,050W headroom)
Required 1,750W
Available 4,800W
4
Runtime Insight
INFORuntime context only. It does not change the electrical compatibility verdict.
Continuous estimate: 1.3h
Device profile reference: up to 2h 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.
⚡
2400W
Running Power
🔋
2048Wh
Capacity
⏱️
~1.3h
Est. Runtime
☀️
1000W
Solar Input
Quick Compatibility Check
- 1 Running headroom: target 1297W; generator provides 2400W.
- 2 Surge headroom: target 3889W; generator provides 4800W.
- 3 Tip: leave headroom for startup spikes and warm conditions.
Model-Specific Results
3 of 3 models are SAFE or TIGHT. Most demanding model: Wayne CDU800 (1/2 HP) (3,381W surge).
| Model | Running | Surge | Verdict | Runtime | Source |
|---|---|---|---|---|---|
| Zoeller M98 Flow-Mate (1/2 HP) | 1,081W | 3,243W | Safe | ~1.3h | NEC Standard |
Show expert analysisTechnical: **Running load:** 1,081W (115V x 9.4A OEM rated). **Surge:** 3,243W at motor startup (3x NEC estimate). **Voltage:** 120V AC. The cast iron PSC motor draws heavy inrush current on every pump cycle. Field note: The Zoeller M98 is the industry reference in cast iron sump pumps. Its PSC motor has no built-in soft-start — the full inrush hits the power station instantly. An external soft-start device can reduce this surge, but size the inverter for the full 3,243W if running without one. Can I run a Zoeller M98 sump pump on a portable power station during a flood? Only if your power source can supply at least 1,081W continuous and 3,243W surge at 120V. The PSC motor creates a hard startup spike that will trip undersized inverters. | |||||
| Wayne CDU800 (1/2 HP) | 1,127W | 3,381W | Safe | ~1.3h | NEC Standard |
Show expert analysisTechnical: **Running load:** 1,127W (NEC 430.248 rated). **Surge:** 3,381W at motor startup (3x NEC estimate). **Voltage:** 120V AC. The coated steel PSC motor draws the highest inrush in this class due to its conservative NEC-rated amperage. Field note: The Wayne CDU800 is the Home Depot best-seller for suburban basements. Without OEM amperage data, specs are derived from NEC tables — the actual draw may be slightly lower, but sizing to NEC ensures safe headroom. Can I keep my Wayne sump pump running on battery backup during a storm? Only if your power source can supply at least 1,127W continuous and 3,381W surge at 120V. The motor startup surge is the critical factor — most small power stations cannot handle it. | |||||
| Liberty Pumps 287 VMF (1/2 HP) | 920W | 2,645W | Safe | ~1.6h | OEM Manual |
Show expert analysisTechnical: **Running load:** 920W (115V x 8.0A OEM rated). **Surge:** 2,645W at motor startup (115V x 23A LRA, OEM verified). **Voltage:** 120V AC. The 3450 RPM PSC motor with OEM-documented LRA provides the most precise surge data in this class. Field note: The Liberty 287 is the plumber's choice and the most battery-friendly 1/2 HP sump pump in this comparison. With OEM-verified LRA data, the 2,645W surge is a confirmed number — not an estimate. A 3,000W power station can handle this reliably. Is the Liberty 287 easier to run on a power station than other sump pumps? Only if your power source can supply at least 920W continuous and 2,645W surge at 120V. Its OEM-documented 23A locked rotor current is lower than NEC estimates for competing 1/2 HP pumps, making it more generator-friendly. | |||||
How This Pairing Performs Across Our Database
This unit ranks #7 of 17 compatible generators for this device by buffered margin (Balanced class).
How Sump Pump (1/2 HP) Performs Across 33 Tested Generators
17 of 33 generators are SAFE+TIGHT for Sump Pump (1/2 HP).
17
Safe+Tight
Safe 12 (36%)
Tight 5 (15%)
Soft Start 6 (18%)
Fail 10 (30%)
Power Comparison: EcoFlow DELTA 2 Max vs Top Alternatives for Sump Pump (1/2 HP)
EcoFlow DELTA 2 Max Safe Balanced
Current unit
Running 2,400W
Surge 4,800W
Fit class uses buffered needs (running and surge) for this device.
Specs & Surge Analysis
Emergency
Sump Pump (1/2 HP)
Storm Flood Prevention
Select Your Model:
1127W
Running
3381W
Surge
120V
Required
True Surge™ Analysis
Safety Buffer: +15% Running Power Usage 54% Utilization
1297W required 2400W Capacity
1103W headroom
Surge/Startup Peak 81% Utilization
3889W required 4800W Capacity
911W headroom
Voltage Match 120V ↔ 120V ✓
Startup Surge Visual
Startup Surge
Sump Pump (1/2 HP) vs DELTA 2 Max
Startup surge stays within the power station surge limit.
⚠️
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 4800 W surge can support typical startup loads for refrigerators, well pumps, and air compressor motors that require momentary inrush current. The 2048 Wh capacity provides extended runtime for moderate continuous loads. This configuration can handle brief motor starts while sustaining steady power delivery for home backup scenarios.
This unit uses LFP chemistry, which offers a different thermal profile than older lithium chemistries. The manufacturer provides operational guidelines in their documentation. Source: EcoFlow DELTA 2 Max User Manual v1.0 (manufacturer documentation). Follow all usage instructions to maintain safe operation.
Extend Runtime with Solar
Keep your Sump Pump (1/2 HP) running with solar • MPPT: 11– 60V • Max: 1000W
Official EcoFlow
400W Panel
1 Hour Sun =
+0.2h per sun hour
MC4 -> XT60i
Full in ~7.3h Adapter required: MC4 -> XT60i.
Smart Value Bluetti
350W Panel
1 Hour Sun =
+0.2h per sun hour
MC4 -> XT60i
Full in ~8.4h Adapter required: MC4 -> XT60i.
Smart Value Bluetti
200W Panel
1 Hour Sun =
+0.1h per sun hour
MC4 -> XT60i
Full in ~14.6h Adapter required: MC4 -> XT60i.
Technical Analysis
Spec-Based • No GuaranteesTechnical Breakdown
Running load: 920–1,127W depending on model. Surge: 2,645–3,381W at motor startup. Voltage: 120V AC required. All 1/2 HP sump pumps use PSC induction motors with significant startup inrush — the surge is the critical sizing factor for battery backup.
Expected Behavior
Estimated runtime: ~1.3h. Sump pumps activate automatically via float switch during flooding. Each motor start produces a surge lasting 1-3 seconds. Typical storm usage: 2 hours/day with intermittent cycling. Daily energy: 1,840–2,254 Wh.
Field Note
Sump pump backup is the #1 emergency use case for portable power stations. The motor startup surge — not the running watts — determines whether your power station can handle it. Check the surge rating, not just the wattage.
Frequently Asked Questions
Can the EcoFlow DELTA 2 Max power a Sump Pump?
Yes. The EcoFlow DELTA 2 Max provides 2400W running / 4800W surge. The Sump Pump (1/2 HP) needs 1297W / 3889W (including 15% buffer). That leaves 1103W of running headroom and 911W of surge margin.
How long will the DELTA 2 Max run a Sump Pump?
Approximately 1.3 hours, based on the Sump Pump (1/2 HP)'s 1127W draw and the DELTA 2 Max's 2048Wh capacity (70% usable after real-world losses).
What Else Can You Run?
With 780W allocated to the Sump Pump (1/2 HP), the DELTA 2 Max still has ~13W of margin. These devices could run simultaneously:
🔥
Space Heater (Eco)
750W
💡
LED Lamp
10W
📱
Smartphone Fast-Charge
20W
Storm Safety: Since the Sump Pump (1/2 HP) is critical for preventing flooding, we recommend testing this setup specifically before the storm season. Ensure the DELTA 2 Max is fully charged to 100% as storms approach.
Compare all 33 generators for the Sump Pump (1/2 HP)
Ranked by budget, runtime, and overall compatibility.
Technical Sourcing & Verification
ID: ecoflow-delta-2-max-sump-pump-half-hp 🏛️ Device Data Source
Engineering Est. Safety Factor Applied
Derived from variant list (max of variants). Worst case = Wayne CDU800 (1127W running, 3381W surge).
⚡ Generator Specs Source
OEM Verified
EcoFlow DELTA 2 Max User Manual v1.0
Methodology informed by US Department of Energy (DOE) & EIA references where applicable.
Our methodology →
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