Champion 6500W Tri Fuel Inverter
#4 in LargeFull review
A mid-size home-backup inverter for people with a natural gas line or a transfer switch who want unattended starting. It also covers a 30 A RV.
Amazon $1,299$1,299
The Champion 6500W Tri Fuel Inverter is the better inverter generator overall, rated 4.0 to 3.8. The Champion 6500W Tri Fuel Inverter leads on run time. The Champion 6500W Tri Fuel Inverter costs $200.99 less ($1,299 vs $1,499.99).
GENMAX GM8000iETC
#6 in LargeFull review
A mid-priced tri-fuel inverter for home backup through a transfer switch, especially for houses with a natural gas line. Auto start, app control and CO shutoff are unusual at this price.
Amazon $1,499.99$1,499.99
Prices were last checked October 22, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Champion 6500W Tri Fuel Inverter for run time (18 hours on a tank at 25% load vs 10 hours on a tank at 25% load).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every large inverter generator; a clear win is highlighted. How we rank explains each one.
| Factor weight | Champion 6500W Tri Fuel Inverter | GENMAX GM8000iETC |
|---|---|---|
| Overall rating | 4.0/5 | 3.8/5 |
| Value 30% | 66 $0.25 per running watt | 66 $0.25 per running watt |
| Quiet 20% | 50 64 dBA at light load, maker rating | 62 62 dBA at light load, maker rating |
| Run time 15% | 86 18 hours on a tank at 25% load | 29 10 hours on a tank at 25% load |
| Fuel options 10% | 100 gasoline, propane or natural gas | 100 gasoline, propane or natural gas |
| CO safety 10% | 100 shuts off when carbon monoxide builds up | 100 shuts off when carbon monoxide builds up |
| Warranty 10% | 50 3-year warranty | 50 3-year warranty |
| Starting 5% | 100 electric start with a remote fob or app | 100 electric start with a remote fob or app |
Specifications
| Champion 6500W Tri Fuel Inverter | GENMAX GM8000iETC | |
|---|---|---|
| Output | ||
| Gasoline | 5,250 W running, 6,500 W starting | 6,000 W running, 8,000 W starting |
| Propane | 4,725 W running, 6,500 W starting | 5,500 W running, 7,250 W starting |
| Natural gas | 4,253 W running | 4,800 W running |
| Outlets | 4 × 120 V, TT-30 (RV), L14-30 | 2 × 120 V, L5-30, USB |
| Parallel capable | No | Yes |
| Total harmonic distortion | under 3% | under 3% |
| Price per watt | $0.25 | $0.25 |
| Fuel and run time | ||
| Fuel | Gasoline, propane, natural gas | Gasoline, propane, natural gas |
| Tank | 4.5 gal | 3.6 gal |
| Run time (gasoline) | 18 hr at 25% load | 10 hr at 25% load |
| Run time (propane, 20 lb tank) | 16 hr | - |
| Engine | 224 cc | 312 cc |
| Noise and safety | ||
| Rated noise (light load) | 64 dBA | 62 dBA |
| CO shutoff | Yes | Yes |
| Build | ||
| Starting | Remote, electric and recoil | Remote, electric and recoil |
| App | No | Yes |
| Wheels | Yes | Yes |
| Dimensions | 25.2 x 20.5 x 22.6 in | 24.0 x 18.5 x 21.1 in |
| Weight | 123.5 lb | 144.6 lb |
| Warranty | 3 years | 3 years |