Is the DF451i worth $180 more than the DF450i?

Only if electric start matters to you. The engines, wattage, noise, run times and weight are the same, so you are paying for the starter and nothing else.

Which one is better for RV use?

Both. Each has a NEMA TT-30R outlet, 3500 rated watts on gasoline, and 58 dBA at quarter load, which is quiet enough for most campgrounds.

They should last the same. Both use the same 212cc engine and carry a three-year limited warranty, so maintenance matters more than the model.

Can either run on propane?

Yes. Both run on a 20 lb propane tank at 4500 surge / 3150 rated watts and give about 9 hours at half load.

Can I run a 15,000 BTU RV air conditioner on either?

Usually yes. A 15,000 BTU unit draws roughly 1,500 to 1,800 running watts with a higher startup surge, and both have 4500 surge watts.

Do both have a fuel shut-off?

Yes. Both let you run the carburetor dry before storage, which helps prevent buildup.

WEN DF450i Super Quiet 4500-Watt Dual Fuel RV-Ready Portable Inverter Generator with Fuel Shut-Off vs WEN DF451i Super Quiet 4500-Watt Electric Start Dual Fuel RV-Ready Portable Inverter Generator with Fuel Shut-Off

These are the same generator with one real difference: the DF451i adds keyless electric start with a backup recoil starter. Both make 4500 surge / 3500 rated watts on gasoline and 4500 surge / 3150 rated watts on propane, run a 212cc engine at 58 dBA, and weigh about 100 lb. On November 3, 2026 the DF450i was $699.99 at Amazon and the DF451i was $879.99 at Walmart, a $180 gap. Buy the DF450i unless you want push-button starting.

Today the WEN DF450i Super Quiet 4500-Watt Dual Fuel RV-Ready Portable Inverter Generator with Fuel Shut-Off costs $180.00 less at its best price.

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