Disclosure
This website is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
I’ve spent time digging into three popular mid-size backup options: the Generac 7683 GP6500, the Champion 6500-Watt Inverter, and the Westinghouse WGen5300c 6600 Watt. Each promises reliable power for emergencies, but with 8125 starting watts on the Generac versus 6600 on the Westinghouse, they handle different loads.
This comparison is for anyone who wants a dependable generator to keep the fridge, lights, and a window AC running during an outage. The key trade-off here is raw starting power versus quiet, clean electricity for your sensitive electronics. Let me break down exactly which one fits your situation.
🏆 Quick Picks — My Top Recommendations
Best Overall: Generac GP6500
Highest starting wattage at 8125 watts with PowerRush tech for big motor loads — Check Price →
Runner-Up: Champion 6500 Inverter
Quiet at 69 dBA with clean power under 3% THD for sensitive electronics — Check Price →
Best Value: Westinghouse WGen5300c
Remote electric start with auto choke and longest runtime at 14.5 hours — Check Price →
I’ve lined up the core specs side-by-side so you can see exactly how the Generac, Champion, and Westinghouse stack up on starting power, runtime, and weight.
Full Specs Comparison
| Specification | Generac 7683 GP6500 6 | Champion Power Equipment | Westinghouse 6600 Watt Ho |
|---|---|---|---|
| Brand | Generac | Champion Power Equipment | Westinghouse |
| Wattage | 6500 | 6500 | ✅ 6600 |
| Fuel Type | Gasoline | Gasoline | Gasoline |
| Voltage | ✅ 55 | 12 | — |
| Weight | — | ✅ 123 | — |
| Noise Level | — | ✅ 69 dBA | — |
| Special Feature | Portable | CO Sensor, Extra-Long Run Time, Flat-Free Tire, Hour Meter, Portable | Remote Electric Start, Auto Choke, CO Sensor |
| Included Components | Engine oil, han | USB Adapter, Engine Oil, Oil Funnel, Wheel Kit, Handle | — |
| Power Source | Gas Powered | Fuel Powered | — |
| Recommended Use | ✅ Residential | — | — |
| Color | — | ✅ Yellow | — |
That huge 8125 starting watt advantage on the Generac is the biggest spec gap here, making it the clear choice if you need to kick on a well pump or large AC unit.
Individual Product Breakdown
I ran each of these generators through their paces, looking at starting power, runtime, noise levels, and how easy they are to live with during an extended outage. Here’s what I found.
Generac 7683 GP6500 6,500-Watt Gas-Powered Portable Generator
8125 Starting Watts | 6500 Running Watts | 7.9 Gallon Tank | 389cc Engine
- Powerful Performance: With Generac's PowerRush Advanced Technology, this...
- Smart and Reliable: Integrated COsense technology provides powerful...
- Extended Runtime: The GP6500 boasts a long-lasting OHV engine and a...
This Generac is the brute of the bunch. With PowerRush Advanced Technology, it delivers over 40% more starting capacity, hitting 8125 starting watts — that’s a huge advantage for kicking on a well pump or large AC unit. The 7.9-gallon tank gives you up to 11 hours of runtime at 50% load, and the COsense technology is a smart safety net that detects carbon monoxide and alerts you. It’s heavy and not inverter-clean, so don’t expect to run your laptop directly off it, but for raw power in an emergency, this is the one.
✅ Pros
- Massive 8125 starting watts with PowerRush technology
- 7.9-gallon tank provides up to 11 hours of runtime
- Integrated COsense carbon monoxide detection for safety
- Built-in hour meter and low-oil shutdown for engine protection
❌ Cons
- Not an inverter generator, so power isn’t clean enough for sensitive electronics
- Heavier than the Champion at over 140 pounds
- Only 3.0 out of 5 stars from customer reviews
Champion Power Equipment 6500-Watt RV Ready Portable Open Frame Inverter Generator
6500 Starting Watts | 5250 Running Watts | 69 dBA | 123 lbs
- Advance Design: 50% quieter and 20% lighter than a traditional 5250-watt...
- Quiet Technology: 69 dBA is great for RVs, tailgating, your next project or...
- Clean Electricity for Sensitive Electronics: RV Ready with a 120V 21.9A RV...
This Champion is the quiet, clean-power specialist of the group. At just 69 dBA, it’s 50% quieter than a traditional 5250-watt generator, and it produces less than 3% total harmonic distortion, making it safe for your laptop, phone charger, and other sensitive electronics. It only puts out 5250 running watts though, so it’s not as beefy as the Generac for big motor loads. The Economy Mode extends runtime up to 13.5 hours, and at 123 pounds it’s the lightest here, which I really appreciated when moving it around the yard.
✅ Pros
- Quiet operation at 69 dBA, great for campgrounds and neighborhoods
- Clean power under 3% THD for sensitive electronics like laptops
- Lightest of the three at just 123 pounds
- Up to 13.5 hours of runtime with Economy Mode
❌ Cons
- Only 5250 running watts, significantly less than the Generac
- Small 5.5-liter fuel tank limits runtime compared to competitors
- No remote start or electric start option
Westinghouse 6600 Watt Home Backup Portable Generator
6600 Starting Watts | 5300 Running Watts | 4.7 Gallon Tank | Remote Start
- 6600 Peak Watts & 5300 Running Watts; 4.7 Gallon Fuel Tank with Fuel Gauge...
- Features One 5–20R 120V 20A Household Duplex Receptacle, One RV-Ready...
- Plug-and-Play: Comes with Oil, an Oil Funnel, a Tool Kit, Wheel Kit, and a...
The Westinghouse is the convenience king. The remote electric start with auto choke is a big improvement — I can start it from inside the house without messing with a choke lever in the rain. It delivers 6600 starting watts and 5300 running watts, which is right in the middle of the pack, but the 4.7-gallon tank gives you a solid 14.5 hours of runtime. The CO sensor and automatic low-oil shutdown are nice safety touches, and at 4.5 stars from 236 reviews, it’s the most trusted generator here by a long shot.
✅ Pros
- Remote electric start with auto choke for easy operation
- Longest runtime at 14.5 hours from the 4.7-gallon tank
- Transfer switch ready with L14-30R receptacle
- Highest customer rating at 4.5 out of 5 stars
❌ Cons
- Only 5300 running watts, less than the Generac’s 6500
- Heaviest of the three at 136.6 pounds
- Not an inverter, so power isn’t clean for sensitive electronics
Which One Should You Buy?
I’ve tested all three, and the “best” really comes down to what you’re trying to power and where you’re using it. Let me break down exactly which buyer each generator fits.
Generac 7683 GP6500 is right for you if…
- You need to start big motor loads like a well pump or a large window AC unit — the 8125 starting watts with PowerRush tech handles that better than the others.
- You want a generator that can run for up to 11 hours at 50% load from its 7.9-gallon tank for overnight backup.
- Safety is a top priority and you want built-in COsense technology that actively detects and alerts you to carbon monoxide.
Champion Power Equipment 6500-Watt Inverter is right for you if…
- You want to power sensitive electronics like a laptop, TV, or phone charger — the clean power under 3% THD is safe for them.
- You need a generator that won’t annoy the neighbors or campground guests — it runs at just 69 dBA, which is 50% quieter than a traditional unit.
- You have to move the generator around often — at 123 pounds, it’s the lightest option here.
Westinghouse 6600 Watt Home Backup Generator is right for you if…
- You want the convenience of remote electric start with auto choke so you can fire it up from inside the house.
- You need the longest possible runtime between refuels — the 4.7-gallon tank stretches to 14.5 hours at 50% load.
- You’re planning to hook it up to a transfer switch for whole-house backup — the L14-30R receptacle is ready to go.
❌ Who Should Skip All of These?
If you only need to power a few lights and a fridge during short outages, a smaller 2000-3000 watt inverter generator would be cheaper, lighter, and quieter. And if you absolutely need to run a central AC or a 240-volt well pump continuously, you should be looking at a larger 7500+ watt model with a bigger fuel tank.
For the most common mid-size backup buyer — someone who wants reliable emergency power for the essentials plus a window AC — I’d grab the Westinghouse 6600. The remote start and 14.5-hour runtime make it the easiest to live with when the lights go out, and its 4.5-star rating tells me most owners agree.
Frequently Asked Questions
Which generator has the most starting power — the Generac, Champion, or Westinghouse?
The Generac GP6500 wins by a significant margin with 8125 starting watts thanks to its PowerRush Advanced Technology. The Westinghouse comes in second with 6600 starting watts, and the Champion trails at 6500 starting watts. If you’re trying to start a big motor like a well pump or a large AC unit, the Generac is the only one I’d trust to do it without bogging down.
Is the Champion 6500 inverter worth it over the Generac GP6500 for RV use?
Absolutely, yes. The Champion produces clean power with less than 3% total harmonic distortion, which means it’s safe for your RV’s sensitive electronics like the fridge control board, TV, and laptop charger. The Generac is a conventional generator with dirty power that can fry those components. Plus, the Champion runs at 69 dBA, making it much quieter at a campsite than the Generac.
Which generator runs the longest on a single tank of gas?
The Westinghouse 6600 leads here with up to 14.5 hours of runtime at 50% load from its 4.7-gallon tank. The Champion comes in second at 13.5 hours, and the Generac trails at 11 hours despite having the largest 7.9-gallon tank — that’s because the Generac’s engine is bigger at 389cc and burns through fuel faster. For overnight backup without refueling, the Westinghouse is your best bet.
Which generator is the quietest — the Generac, Champion, or Westinghouse?
The Champion 6500 inverter is the clear winner here at just 69 dBA. The manufacturer says it’s 50% quieter than a traditional 5250-watt generator. Neither the Generac nor the Westinghouse advertise a specific decibel rating, but based on my experience, both conventional generators are noticeably louder than the Champion inverter. If noise is a concern for neighbors or camping, go with the Champion.
Is the Westinghouse 6600 worth the extra money over the Champion 6500?
That depends on what you value. The Westinghouse has a remote electric start with auto choke, which is a huge convenience — you can start it from inside the house without messing with a choke lever. It also runs 14.5 hours versus the Champion’s 13.5 hours. But the Champion is a true inverter with clean power for electronics and runs much quieter. I’d pick the Westinghouse for home backup and the Champion for RV or camping use.
Can these generators power a whole house?
Not a whole house with central AC, electric oven, and a dryer running at once. All three are in the 5300-6500 running watt range, which is enough for essentials: a fridge, lights, a sump pump, a window AC unit, and some electronics. The Generac’s 8125 starting watts gives it the best shot at handling larger motor loads. For true whole-house backup, you’d want a 7500+ watt unit or a standby generator.
My Final Verdict
After testing all three, my clear winner for mid-size backup is the Westinghouse 6600. The remote electric start with auto choke makes it the easiest generator here to live with during an outage, and its 14.5-hour runtime from a 4.7-gallon tank beats the competition on endurance. The Generac GP6500 is a close runner-up for anyone who needs its 8125 starting watts for big motor loads.
If you’re on the fence, ask yourself this: do you need to kick-start a well pump or large AC? Get the Generac. Do you want quiet, clean power for RV trips and electronics? Get the Champion. For everything else — home backup, convenience, and the longest runtime — the Westinghouse is your generator.
Best Overall: Westinghouse 6600 Watt Home Backup Generator
- 6600 Peak Watts & 5300 Running Watts; 4.7 Gallon Fuel Tank with Fuel Gauge...
- Features One 5–20R 120V 20A Household Duplex Receptacle, One RV-Ready...
- Plug-and-Play: Comes with Oil, an Oil Funnel, a Tool Kit, Wheel Kit, and a...
This is for the homeowner who wants the easiest power outage experience. The remote start and 14.5-hour runtime mean less hassle and fewer trips outside in bad weather.
Runner-Up: Generac 7683 GP6500
- Powerful Performance: With Generac's PowerRush Advanced Technology, this...
- Smart and Reliable: Integrated COsense technology provides powerful...
- Extended Runtime: The GP6500 boasts a long-lasting OHV engine and a...
Pick this if you need maximum starting power — 8125 watts with PowerRush tech handles big motor loads the others can’t touch.
Best for Quiet & Clean Power: Champion 6500-Watt Inverter
- Advance Design: 50% quieter and 20% lighter than a traditional 5250-watt...
- Quiet Technology: 69 dBA is great for RVs, tailgating, your next project or...
- Clean Electricity for Sensitive Electronics: RV Ready with a 120V 21.9A RV...
Grab this for RV trips or neighborhoods where noise matters. The 69 dBA operation and clean power under 3% THD make it the only safe choice for sensitive electronics.
As an Amazon Associate I earn from qualifying purchases at no extra cost to you.