Head to head
Champion 8500W Dual Fuel Inverter vs EcoFlow DELTA Pro 3
Champion · Inverter Generator
Champion 8500W Dual Fuel Inverter
~$1,779
7,000 W / 8,500 W surge · up to furnace blower, sump pump or a window AC
EcoFlow · Power Station
EcoFlow DELTA Pro 3
~$2,399
4,000 W / 8,000 W surge · up to furnace blower, sump pump or a window AC
Quick takeThe Champion 8500W Dual Fuel Inverter lists about $620 lower; the EcoFlow DELTA Pro 3 runs silently indoors on stored battery power while the Champion 8500W Dual Fuel Inverter burns dual fuel (gas/propane) for as long as you can refuel it; the Champion 8500W Dual Fuel Inverter puts out more sustained power (7,000 W); the EcoFlow DELTA Pro 3 is quieter at 30 dB.
| Spec | Champion 8500W Dual Fuel Inverter | EcoFlow DELTA Pro 3 |
|---|---|---|
| Approx. price | ~$1,779 | ~$2,399 |
| Type | Inverter Generator | Power Station |
| Fuel | Dual Fuel (Gas/Propane) | Battery (LiFePO4) |
| Running / output watts | 7,000 W | 4,000 W |
| Starting / surge watts | 8,500 W | 8,000 W |
| Battery capacity | — | 4,096 Wh |
| Expandable to | — | 48,000 Wh |
| Noise | 61 dB | 30 dB |
| Runtime | 14 hrs @ 25% load (gas); ~12 hrs on 20-lb propane | Fridge (~150W): ~23 hrs on base unit |
| Outlets | 1x 120/240V 50A (14-50R), 1x 120/240V 30A (L14-30R), 2x 120V 20A GFCI duplex | 7x AC incl. 120/240V 30A L14-30 & 30A TT-30, 2x 140W USB-C, 2x USB-A |
| Fuel tank | 5.3 gal | — |
| Weight | 214 lbs | 113.5 lbs |
| Transfer-switch ready | Yes | Yes |
| Warranty | 3-year limited | 5-year |
Highlighted cell is the better figure for that row.
Owner pros and cons
Champion 8500W Dual Fuel Inverter
- +61 dBA claim holds at light load — dramatically quieter than open frames
- +50-amp 14-50R outlet feeds larger transfer switches
- +Propane option avoids stale-fuel problems for storm storage
- +Clean inverter power safe for HVAC boards and electronics
- +Massive value against the EU7000iS
- −214 lbs — moving it over any obstacle is a two-person job
- −Noise rises sharply under heavy load
- −Propane derates output roughly 10%
- −Warranty service on a unit this heavy is logistically painful
EcoFlow DELTA Pro 3
- +True 4000W / 8000W surge with 240V L14-30 - runs well pumps and dryers solo
- +Much quieter than the original DELTA Pro, according to an owner who upgraded
- +Expandable to 12kWh per unit, 48kWh system - grow as budget allows
- +10ms UPS keeps servers and fish tanks alive through switchover
- +2600W solar input recharges it in a real morning of sun
- +Massive 2026 price drops - routinely ~$2,000-2,400 vs $3,699 launch
- −113.5 lbs; wheels help but two people needed for stairs or truck beds
- −Fan noise ramps sharply during 1800W+ fast charging
- −Warranty has been refused on units bought from EcoFlow's own Amazon storefront
- −Firmware has been rocky: a 2026 build was withdrawn after release