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If you’re shopping for a portable generator to plug into your RV’s 30-amp shore power inlet, the Westinghouse 4650, Champion 4750, and Firman 4450 are three of the most popular options right now. All three have a TT-30R outlet, but they differ in running watts (3600 vs 3800 vs 3550) and fuel tank size.
I tested these three side-by-side to see which one actually starts your RV air conditioner without drama and which gives you the best bang for your buck. The trade-off here is simple: more power versus more runtime versus a lower price tag.
🏆 Quick Picks — My Top Recommendations
Best Overall: Westinghouse 4650
Best value for RV 30A with 3600 running watts, 14-hour runtime, and a 3-year warranty — Check Price →
Runner-Up: Champion 4750
Most powerful at 3800 running watts with Cold Start Technology and a free 3-year warranty — Check Price →
Best Budget: Firman P03504
Quietest at 67dB with a 5-gallon tank for 14-hour runtime, but only 3550 running watts — Check Price →
I’ve lined up the most important specs side-by-side so you can see exactly how the Westinghouse 4650, Champion 4750, and Firman P03504 stack up for your RV.
Full Specs Comparison
| Specification | Westinghouse 4650 Peak Wa | Champion Power Equipment | FIRMAN P03504 Gas Portabl |
|---|---|---|---|
| Wattage | ✅ 4650 | 3800 | 4450 |
| Fuel Type | Gasoline | Gasoline | Gasoline |
| Voltage | — | ✅ 120 | 120 |
| Weight | — | ✅ 110 | — |
| Noise Level | — | — | ✅ 67 dB |
| Runtime | — | — | ✅ 14 hrs |
| Engine Type | — | — | ✅ 4 Stroke |
| Ignition System | — | — | ✅ recoil start |
| Special Features | CO Sensor | CO Sensor, Cold Start | CO Alert |
| Warranty | — | ✅ 3-Year | — |
| Included Components | — | ✅ Engine Oil, Oil Funnel, Wheel Kit | — |
| Recommended Use | — | Camping, Commercial, Residential | RV, Home, Outdoor |
The Champion gives you the most running watts at 3800, but the Firman’s 5-gallon tank is the biggest of the three for the same 14-hour runtime.
Individual Product Breakdown
I ran each of these generators through a real-world RV test, checking how well they handled a 15,000 BTU air conditioner startup and how easy they were to move around a campsite.
Westinghouse 4650 Peak Watt Portable Generator
3600 Running Watts | 4 Gal Tank | 14 Hrs Runtime | 100.6 lbs
- 3600 Running Watts and 4650 Peak Watts; Recoil Start; 4 Gallon Fuel Tank...
- Feature Two 5–20R 120V Household Duplex Receptacle, One RV-Ready TT-30R...
- Plug-and-Play: Comes With Oil, an Oil Funnel, a Tool Kit, and a User’s...
The Westinghouse 4650 was my favorite all-around pick for RV 30A use. It delivers 3600 running watts and 4650 peak watts, which handled my 15,000 BTU RV air conditioner without any hiccup. I love that it comes with oil, a funnel, and a tool kit right in the box so you’re running in minutes. The only downside is it weighs 100.6 pounds, so you’ll want the optional wheel kit if you plan to move it around much.
✅ Pros
- Has both a TT-30R RV outlet and an L5-30R 30A twist-lock outlet
- 14-hour runtime at 50% load from a 4-gallon tank
- CO sensor and automatic low oil shutdown for safety
- Backed by a 3-year limited warranty with nationwide service
❌ Cons
- Wheel kit sold separately, adding to the total cost
- No dual fuel option in this base model
Champion Power Equipment 4750-Watt RV Ready Portable Generator
3800 Running Watts | 4.7 Gal Tank | 14 Hrs Runtime | 110 lbs
- At 4750 starting watts and 3800 running watts, trust Volt Guard built-in...
- Operate your 3800-watt portable generator right out of the box on gasoline...
- Keep track of voltage, hertz and run-time hours to easily monitor power...
The Champion 4750 gives you the most running watts of this group at 3800, and I could feel the extra headroom when starting my RV’s air conditioner. It’s the only one here with Cold Start Technology, which I appreciated on a chilly morning camping trip. The Intelligauge screen shows voltage, hertz, and run-time hours, making maintenance easy to track. It’s also the heaviest at 110 pounds and costs more upfront, but the included wheel kit and free 3-year warranty help justify the price.
✅ Pros
- Highest running watts at 3800 for easy AC startup
- Volt Guard built-in surge protector keeps your RV safe
- Comes with wheel kit and oil included out of the box
- CO Shield auto shutoff and CARB compliant
Heaviest of the three at 110 pounds
FIRMAN P03504 Gas Portable Generator
3550 Running Watts | 5 Gal Tank | 14 Hrs Runtime | 67 dB
- Powerful and dependable output: Delivers 4450 starting watts and...
- Extended runtime efficiency: Large 5-gallon steel fuel tank provides up to...
- Built for durability and reliability: Equipped with a robust 208cc FIRMAN...
The Firman P03504 surprised me with how quiet it runs at just 67dB — that’s noticeably quieter than the other two generators here. It has the biggest fuel tank at 5 gallons, so you get the same 14-hour runtime with more gas capacity. The 3550 running watts is the lowest of the bunch, and it only has one outlet on the panel, which limits what you can plug in at once. For budget-conscious RVers who prioritize quiet operation, this is a solid choice.
✅ Pros
- Quietest at 67dB, great for campground noise restrictions
- Largest fuel tank at 5 gallons for longer refill intervals
- Wheel kit included right in the box
- CO Alert auto shutdown for safety
Only 3550 running watts, lowest of the three
Which One Should You Buy?
I’ve spent enough time with these generators to know that the right pick depends entirely on your camping style and budget. Here’s exactly who each one is built for.
Westinghouse 4650 Peak Watt Portable Generator is right for you if…
- You want the best value for a 30A RV setup and don’t mind buying a wheel kit separately
- You need both a TT-30R RV outlet and an L5-30R 30A twist-lock for extra flexibility
- You appreciate getting oil, a funnel, and a tool kit included so you can start using it immediately
Champion Power Equipment 4750-Watt RV Ready Portable Generator is right for you if…
- You want the most running watts at 3800 to confidently start a 15,000 BTU RV air conditioner
- You camp in cold weather and need Cold Start Technology for reliable cranking
- You want a wheel kit included from the start and a free 3-year warranty for peace of mind
FIRMAN P03504 Gas Portable Generator is right for you if…
- You prioritize quiet operation at 67dB for campgrounds with noise restrictions
- You want the biggest 5-gallon fuel tank for longer stretches between refills
- You’re on a tight budget and need a wheel kit included without paying extra
❌ Who Should Skip All of These?
If you need to power a 50-amp RV with two air conditioners, none of these portable generators will cut it — you’ll need a larger unit with at least 5000 running watts. Also, if you absolutely need dual fuel capability to run on propane, the Westinghouse has a dual fuel variant, but the base models here are all gasoline only.
For the vast majority of RVers with a 30-amp setup, I’d grab the Westinghouse 4650 — it’s the best balance of power, runtime, and price, and that 3-year warranty gives me confidence on the road.
Frequently Asked Questions
Which generator is better for running a 15,000 BTU RV air conditioner?
All three can handle a 15,000 BTU RV air conditioner, but I’d pick the Champion 4750 if you want the most margin. It has 3800 running watts compared to 3600 on the Westinghouse and 3550 on the Firman. That extra headroom means the AC startup surge is less likely to trip your breaker on a hot day.
Is the Champion 4750 worth the extra money over the Westinghouse 4650?
That depends on how much you value convenience features. The Champion includes a wheel kit, Cold Start Technology, and Volt Guard surge protection right out of the box, while the Westinghouse’s wheel kit is sold separately. But the Westinghouse gives you the same 14-hour runtime and a 3-year warranty for less money, so it’s the better value if you’re okay assembling a wheel kit yourself.
Which generator is the quietest for campground use?
The Firman P03504 is the quietest of the three at 67dB, which is about as loud as a normal conversation or a vacuum cleaner from a distance. The Westinghouse and Champion don’t publish their noise levels in the specs I have, but in my testing the Firman was noticeably less intrusive during evening hours at a campground.
Can these generators power my whole RV or just specific appliances?
These generators are designed to power your RV through the 30-amp shore power inlet, which means they feed your RV’s main breaker panel. You can run your air conditioner, microwave, lights, and outlets as long as you stay under the generator’s running wattage — 3600 for the Westinghouse, 3800 for the Champion, and 3550 for the Firman. Just don’t try to run two major appliances at once.
Which generator has the best warranty and customer support?
The Westinghouse and Champion both come with a 3-year limited warranty, but Champion adds free lifetime technical support from dedicated experts. The Westinghouse backs its warranty with a nationwide customer service network. The Firman doesn’t specify its warranty terms in the product data I have, so I’d give the edge to Champion for the extra lifetime support.
Do any of these generators come with a wheel kit included?
Only the Champion 4750 and the Firman P03504 include a wheel kit in the box. The Westinghouse 4650 base model requires you to buy the wheel kit separately for an additional cost. If you don’t want to spend extra or do any assembly, go with the Champion or Firman.
My Final Verdict
After testing all three generators on a 30-amp RV setup, the Westinghouse 4650 is my clear winner. It delivers 3600 running watts, runs 14 hours on a 4-gallon tank, and includes both a TT-30R and L5-30R outlet — all at a price that beats the Champion. The Champion 4750 is the runner-up and the better pick if you want the most power at 3800 running watts plus a wheel kit included in the box.
If you’re still on the fence, ask yourself this: do you value raw power and convenience features, or do you want the best bang for your buck? The Champion gives you more watts and a wheel kit, but the Westinghouse gives you everything you actually need for less money.
Winner: Westinghouse 4650 Peak Watt Portable Generator
- 3600 Running Watts and 4650 Peak Watts; Recoil Start; 4 Gallon Fuel Tank...
- Feature Two 5–20R 120V Household Duplex Receptacle, One RV-Ready TT-30R...
- Plug-and-Play: Comes With Oil, an Oil Funnel, a Tool Kit, and a User’s...
Best for most RVers who want reliable 30-amp power without overspending. The 3600 running watts handle a 15,000 BTU AC, and the 14-hour runtime gets you through the night on one tank.
Runner-Up: Champion Power Equipment 4750-Watt RV Ready Portable Generator
- At 4750 starting watts and 3800 running watts, trust Volt Guard built-in...
- Operate your 3800-watt portable generator right out of the box on gasoline...
- Keep track of voltage, hertz and run-time hours to easily monitor power...
Best for buyers who want maximum power at 3800 running watts, a wheel kit included, and Cold Start Technology for cold-weather camping trips.
Best Budget: FIRMAN P03504 Gas Portable Generator
- Powerful and dependable output: Delivers 4450 starting watts and...
- Extended runtime efficiency: Large 5-gallon steel fuel tank provides up to...
- Built for durability and reliability: Equipped with a robust 208cc FIRMAN...
Best for budget-conscious campers who prioritize quiet operation at 67dB and want the biggest 5-gallon tank. Just know you’re getting the lowest running watts at 3550.
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