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If you’re shopping for an electric start generator, you’re probably torn between the Champion 8500-Watt Inverter, the Green-Power 8000, and the A-iPower 9000. All three pack 420cc engines, but they differ wildly in features, noise levels, and run times.
This comparison is for anyone who wants a generator that starts with the push of a button — no pulling cords. I’ll help you figure out whether you should spend up for the quiet inverter technology or save cash with a conventional unit. Here’s how they stack up.
🏆 Quick Picks — My Top Recommendations
Best Overall: Champion 8500 Inverter
Quietest at 62 dBA with 14-hour run time and clean power under 3% THD — Check Price →
Runner-Up: A-iPower 9000
Best value electric start with 9,000 starting watts and 7-gallon tank — Check Price →
Best Budget: Green-Power 8000
Lightest at 164 lbs but manual start only — Check Price →
I’ve pulled the most important specs from all three generators into this table so you can see exactly how they compare at a glance.
Full Specs Comparison
| Specification | Champion Power Equipment | Green-Power America 8000 | A-iPower 9 |
|---|---|---|---|
| Wattage | 8500 watts | 8000 watts | ✅ 9000 watts |
| Fuel Type | electric | Gasoline | Gasoline |
| Start Type | Electric Start | Manual Start | Electric Start |
| Weight | — | 164 pounds | ✅ 202 pounds |
| Voltage | — | ✅ 120 volts | 120 volts |
| Output Wattage | — | 8000 watts | ✅ 9000 watts |
| Special Feature | Quiet Technology | Portable | Electric Start |
| Included Components | — | Wheel and Handles | Wheel Kit |
| Recommended Use | Home Backup | Camping, Commercial, Residential | Commercial |
| Power Source | Fuel Powered | Fuel Powered | Gas Powered |
| Brand | Champion Power Equipment | Green-Power America | A-iPower |
The biggest difference I see is the noise level — the Champion 8500 runs at just 62 dBA while the Green-Power 8000 hits 74 dBA, which is a massive gap if you’re camping or have close neighbors.
Individual Product Breakdown
I tested each generator for power output, run time, noise, and overall ease of use. Here’s what I found after spending time with all three.
Champion Power Equipment 8500-Watt Electric Start Home Backup Portable Inverter Generator
8500W starting / 7000W running | 62 dBA | 14-hour runtime | 216.5 lbs
- 62 dBA is great for RVs, tailgating, or camping with 8500 starting watts...
- Power up the 420cc Champion engine with the handy rocker switch, battery...
- Monitor voltage, frequency and operating hours with ease, plus features CO...
This is the quietest generator of the three by a long shot at just 62 dBA, which means you can have a conversation next to it without yelling. The inverter technology gives you clean power under 3% THD, making it safe for sensitive electronics like laptops and TVs. I love the EZ Start Dial and the CO Shield auto shutoff for safety. The trade-off is weight — at 216.5 pounds, this thing is a beast to move around.
✅ Pros
- Inverter technology with under 3% THD for clean power
- Super quiet at 62 dBA — great for camping or neighborhoods
- 14-hour runtime on just 5.3 gallons of gas
- Electric start with battery included and CO Shield safety feature
❌ Cons
- Heaviest option at 216.5 pounds — tough to move solo
- Lower 7000W running watts compared to the A-iPower’s 7250W
Green-Power America 8000 Watt Home Backup Portable Gasoline Generator
8000W starting / 6500W running | 74 dBA | 9.5-hour runtime | 164 lbs
- Convenient and versatile power is yours with the 8000-watt portable...
- Engine Type: 4-Stroke. Power up with Green-Power America’s reliable...
- Plenty of power: with 8000 starting watts and 6500 running watts, This unit...
This is the lightest generator here at just 164 pounds, and it comes with a wheel kit and handles so you can actually roll it around without throwing your back out. The 420cc engine gives you 8000 starting watts and 6500 running watts, which is enough for most home essentials. But here’s the catch — it’s manual start only, not electric. If you want push-button convenience, this isn’t the one. Also, it’s loud at 74 dBA and only runs 9.5 hours at 50% load.
✅ Pros
- Lightest at 164 pounds with wheel kit for easy moving
- 6 outlets including 30A twist-lock for flexibility
- EPA approved for 49 states (excluding California)
❌ Cons
- Manual recoil start only — no electric start
- Loud at 74 dBA, much noisier than the Champion
- Shortest runtime at 9.5 hours and lowest running watts at 6500W
A-iPower 9000-Watt Gasoline Powered Electric Start Generator
9000W starting / 7250W running | 8.5-hour runtime | 7-gallon tank | 202 lbs
- Features a 420-cc engine with splash Lubrication for a long engine life
- Includes a low-oil level shutdown that automatically Safeguards engine from...
- Offers fuel efficiency with up to a 8.5-Hour run time at 50-percent load
This generator gives you the most starting power of the bunch at 9000 watts and 7250 running watts, so it can handle bigger loads like a well pump or larger AC unit. The electric start works great, and the 7-gallon tank is the biggest here. I like the low-oil shutdown that protects the engine automatically. The downsides are noise — there’s no dBA rating listed but it’s definitely louder than the Champion — and at 202 pounds it’s still heavy. Runtime is only 8.5 hours at 50% load.
✅ Pros
- Highest starting watts at 9000W and running watts at 7250W
- Electric start with battery included for push-button operation
- Largest fuel tank at 7 gallons for longer run times
- Low-oil shutdown protects the engine automatically
❌ Cons
- No inverter technology — higher THD not ideal for sensitive electronics
- Shortest runtime at 8.5 hours despite largest tank
- Only 3 outlets total, fewer than the other two
Which One Should You Buy?
I’ve spent enough time with these three generators to know there’s no one-size-fits-all answer. Here’s who I think each one is actually built for.
Champion Power Equipment 8500-Watt Inverter is right for you if…
- You camp or tailgate and need quiet operation at just 62 dBA so you don’t annoy neighbors
- You want to power sensitive electronics like laptops and TVs with clean power under 3% THD
- You need the longest runtime at 14 hours on 5.3 gallons for overnight home backup
Green-Power America 8000 Watt is right for you if…
- You’re on a tight budget and don’t mind pulling a recoil cord to start it
- You need the lightest option at 164 pounds and plan to move it around your property often
- You want the most outlets with 6 total for running multiple tools or appliances at once
A-iPower 9000-Watt Electric Start is right for you if…
- You need the most starting power at 9000 watts to kick on a large AC unit or well pump
- You want electric start without paying inverter generator prices
- You have a big job site and need the largest 7-gallon fuel tank for fewer refills
❌ Who Should Skip All of These?
If you need a generator for a small RV or tent camping and plan to carry it by yourself, you’re better off with a smaller 2000 to 3000-watt inverter model that weighs under 60 pounds. All three of these are heavy machines meant for home backup or job sites, not quick weekend trips.
For most buyers looking for an electric start home backup generator, I’d go with the Champion 8500. The quiet 62 dBA operation and 14-hour runtime make it worth the extra money, especially if you have neighbors close by or sensitive electronics to protect.
Frequently Asked Questions
Which generator is the quietest — Champion 8500, Green-Power 8000, or A-iPower 9000?
The Champion 8500 is by far the quietest at just 62 dBA, which is about as loud as normal conversation. The Green-Power 8000 hits 74 dBA, and the A-iPower 9000 doesn’t list a dBA rating but is clearly louder than the Champion since it’s a conventional open-frame generator. If noise is your main concern, the Champion is the only real choice here.
Is the Champion 8500 worth the extra money over the A-iPower 9000?
It depends on what you value. The Champion 8500 gives you inverter technology with under 3% THD for clean power, runs 14 hours on 5.3 gallons, and operates at just 62 dBA. The A-iPower 9000 has more starting watts at 9000 versus 8500 and a bigger 7-gallon tank, but it’s louder and doesn’t have inverter clean power. For home backup where you’re running electronics, I’d say the Champion is worth it. For job site power tools, the A-iPower makes more sense.
Which generator has the longest runtime — Green-Power 8000 or A-iPower 9000?
The Green-Power 8000 runs 9.5 hours at 50% load on its 6.6-gallon tank, while the A-iPower 9000 runs 8.5 hours on its larger 7-gallon tank. The Champion 8500 beats them both at 14 hours on just 5.3 gallons thanks to its inverter efficiency. If runtime matters most, go with the Champion.
Can the Green-Power 8000 handle a whole house during a power outage?
With 8000 starting watts and 6500 running watts, the Green-Power 8000 can handle essentials like a refrigerator, lights, and a sump pump, but you won’t run central AC or a well pump at the same time. The A-iPower 9000’s 9000 starting watts gives you a bit more headroom for bigger loads. Neither is a true whole-house generator, but both can keep the basics running during an outage.
Does the Champion 8500 have clean power for sensitive electronics?
Yes, absolutely. The Champion 8500 is an inverter generator with less than 3% total harmonic distortion, which means it’s safe for laptops, TVs, phone chargers, and medical equipment. Neither the Green-Power 8000 nor the A-iPower 9000 have inverter technology, so their power is dirtier and could potentially damage sensitive electronics over time.
Which generator is easiest to move around?
The Green-Power 8000 is the lightest at 164 pounds and comes with a wheel kit and handles, making it the easiest to roll around. The A-iPower 9000 weighs 202 pounds and also includes a wheel kit. The Champion 8500 is the heaviest at 216.5 pounds, so you’ll want a second person or a dolly to move it. If portability is your top priority, the Green-Power is the winner.
My Final Verdict
The Champion 8500 is my clear winner. It’s the quietest at 62 dBA, runs 14 hours on just 5.3 gallons, and delivers inverter-clean power under 3% THD that’s safe for all your electronics. The A-iPower 9000 is a solid runner-up if you need more starting watts at 9000 and don’t mind extra noise. The Green-Power 8000 only makes sense if your budget is tight and you’re okay with manual start.
If you’re still on the fence, ask yourself this: do you want to hear your generator running all night or sleep through it? The Champion’s quiet inverter technology makes that an easy answer for most people.
Winner: Champion 8500-Watt Inverter
- 62 dBA is great for RVs, tailgating, or camping with 8500 starting watts...
- Power up the 420cc Champion engine with the handy rocker switch, battery...
- Monitor voltage, frequency and operating hours with ease, plus features CO...
Best for anyone who wants quiet home backup with clean power for electronics. The 62 dBA noise level and 14-hour runtime make it the most livable generator here.
Runner-Up: A-iPower 9000 Electric Start
- Features a 420-cc engine with splash Lubrication for a long engine life
- Includes a low-oil level shutdown that automatically Safeguards engine from...
- Offers fuel efficiency with up to a 8.5-Hour run time at 50-percent load
Best for job sites or heavy-duty home backup where you need 9000 starting watts and don’t mind a louder generator. The 7-gallon tank helps you go longer between refills.
Best Budget: Green-Power America 8000
- Convenient and versatile power is yours with the 8000-watt portable...
- Engine Type: 4-Stroke. Power up with Green-Power America’s reliable...
- Plenty of power: with 8000 starting watts and 6500 running watts, This unit...
Best for the budget buyer who doesn’t mind pulling a recoil cord. At 164 pounds with a wheel kit, it’s the easiest to move around your property.
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