Noise matters, especially at a campsite or tailgate. That’s why Flex Power inverter generators are engineered to run whisper-quiet, meeting all National Park Service standards for sound. 2200i – Around 49 dB(A) (quieter than the level of a normal conversation). 3300i – Around 52 dB(A) under typical load. 4500ies – Around 54 dB(A) , depending on load, still quieter than open-frame units in this class. 👉 Translation: These models are quiet enough to keep the peace at the campsite, game day, or in the driveway during a power outage. You’ll hear the crowd, or even the chirp of a cricket (100 db(a) over the hum of Flex Power generators!

Flex Power® 3300i Silent Portable Inverter Generator- Gas Only

RVMP®

Flex Power® 3300i Silent Portable Inverter Generator- Gas Only

Name: Flex Power® 3300i Silent Portable Inverter Generator- Gas Only
Brand: RVMP®
SKU: 220470
Price: 639.00 USD
Availability: InStock

$639.00

$779.00

Save $140.00

The Flex Power® 3300i packs more punch without losing portability. Still compact and easy to carry, it features a 30AMP RV-ready connection for higher-output electronics, tools, and travel trailers. Clean, reliable inverter power in a quiet, lightweight build—perfect for campers, tailgaters, and anyone who needs a little more.

Specifications

SafeCO™ technology (our integrated carbon monoxide detection and protection system)
2 Year Warranty
Watts: 3300 (starting), 2700 (running)
Runtime: On Gas at 50% load, est. runtime of 5-7 hrs.
Fuel capacity: 1.53 gallons
Oil Capacity: 0.58 L/0.15 gal
Engine Size: 149cc
Start: Hand Recoil
Weight: 46 lbs
Dimensions: 18x12x20
Silent: 59 dBA @ 23ft
30amp hook up
2x 120v receptacles
2x USB ports (1x USB C and 1x Standard USB)
1x DC 12V connection
Parallel kit ready
Altitude: at 5,000 ft, output is est. 2,230 watts
Accessory Kit: Engine oil, Oil funnel, Spark plug toolkit, Instruction paperwork

Owner's Manual

Click here to download the owner’s manual for the Flex Power 3300ies (Single & Dual Fuel)

Quantity:

RVMP®Flex Power® 3300i Silent Portable Inverter Generator- Gas Only

$639.00

$779.00

Built for the Extreme. Trusted by Pros.

FAQ

We get it, power products can feel a little technical. That’s why we keep our answers simple, straight, and useful. No jargon, no shenanigans. Just clear info so you can plug in, power up, and get back to the fun stuff.

What is the continuous runtime on a full tank?

Runtime depends on the load you put on the generator—just like miles per gallon in a truck. Here’s what you can expect under typical conditions:

2200i – 1.1 gallon capacity. Up to 8–10 hours at 25% load, 5–6 hours at 50% load.
3300i – 1.53 gallon capacity. Around 7–9 hours at 25% load, 5–6 hours at 50% load.
4500ies – 2.1 gallon capacity. Roughly 8 hours at 25% load, 6–7 hours at 50% load.

👉 Translation: Enough to keep the tailgate going all game, the RV cozy all night, or the fridge cold through an outage. For longer hauls, our dual-fuel models let you switch to propane for even more runtime flexibility.

How loud is it?

Noise matters, especially at a campsite or tailgate. That’s why Flex Power inverter generators are engineered to run whisper-quiet, meeting all National Park Service standards for sound.

2200i – Around 49 dB(A) (quieter than the level of a normal conversation).
3300i – Around 52 dB(A) under typical load.
4500ies – Around 54 dB(A), depending on load, still quieter than open-frame units in this class.

👉 Translation: These models are quiet enough to keep the peace at the campsite, game day, or in the driveway during a power outage. You’ll hear the crowd, or even the chirp of a cricket (100 db(a) over the hum of Flex Power generators!

What’s up with watts? Starting vs. running watts.

Generators speak their own language when it comes to power, so here’s the breakdown:

Starting/Maximum Watts – The quick burst of power your generator provides to kickstart big appliances or tools. Think of it like the “jump” a fridge or A/C needs the second it turns on. This peak ceiling can be hit to provide burst power, but don't push past it.
Running Watts – The steady output your generator delivers hour after hour. This is the power you actually live on. Keeping the lights on, fridge cold, and tailgate TV humming.

👉 At Flex Power, we size our units with these numbers in mind, so you don’t have to do guesswork. Plug in, power up, and relax. Whether it’s game day, camp night, or a stormy outage.

5 stars: 12 (67%)
4 stars: 4 (22%)
3 stars: 1 (6%)
2 stars: 1 (6%)
1 star: 0 (0%)

Generator arrived quickly, securely packaged and works great. Very quiet and works great.

Love this generator!! Great price and very quite comparable to the others I’ve had

Hi Ricky, we're thrilled to hear you love the Flex Power® 3300i! Thanks for sharing your positive experience and for choosing our generator.

Thought I was ordering the dual fuel model but o didn’t as it was not the one on sale. But it’s all good. Only started it once and plugged a fan into it to make sure it worked. Started very easy, pretty quiet and fairly lightweight. Easy to drain the gas out. Glad I have it with all the storms this year.

Hi Gene, thank you for your kind words! We're glad to hear the generator started easily and met your expectations. Stay safe during the storms, and feel free to reach out if you need anything else!

Very easy start, comes with oil. Has worked flawlessly at Monterey historics for 6 days so far. Quiet as well. Im very pleased

Hi Gary! Thanks for sharing your positive feedback!

Nice device. Opened and it was complete except fuel. Started second pull, following instructions. Very quiet running. Plenty of power. Used camping, ran for about 10 hours on one tank of gas. Holds about 1.5gal gasoline.

Hi Robert, thanks so much for your review! We're happy to hear that you're happy with the 3300. Happy camping!

Jury is out …. Gasoline overflowing- waiting fir warranty service

Hi Gary! It seems your issue has been resolved- can you confirm if this is the case?

Started on second pull. Very satisfied, yet haven’t applied it’s capabilities.

Hi Richard, we're thrilled to hear you're satisfied with your Flex Power® 3300i! We hope it meets all your expectations when you put its capabilities to the test. Thanks for sharing your experience!

Great product and starts with ease.

Hi Ed, thank you for your kind words! We're glad you’re happy with your Flex Power® 3300i. Enjoy your power wherever you go!

Quick delivery

Thank you so much for your review!

Excellent! Fired right up!!!

Thank you so much for your review!

I thinks a bit pounder than Honda but overall it’s pretty good

Hi there, thank you for your feedback! We're glad you find the Flex Power® 3300i to be a good option.

So far so good started on the first attempt. Really quite. I am happy with the purchase and the product

Thank you so much for your review! We're happy to hear you are happy with your purchase!

This generator does exactly what I need. I am very impressed with all its features.

Hi Pasquale, thanks for sharing your positive experience. Enjoy your generator!

All good until it stopped running. Re-started ran for 10 minutes and stopped again. Fast forward took it home re-started and it ran for 1 hour. Hope all is well

Hi Doug, thank you for sharing your experience. We're glad it ran well for a while and hope everything is now working smoothly. If you have any other issues, please feel free to reach out to us for support. We appreciate your feedback!

Used only a short time on the RV to see how it would work with the AC and it did well. Starts most times on the second pull. There is no way to check fuel level on this other than look in the tank. That is a huge issue for me, even the Harbor Freight had a way to see the fuel level. The customer support response using email or their own contact form was non responsive after several days. I eventually called and did someone on the phone. If you try to register for the warranty they do not call it a generator it is an inverter. And, you only enter the serial number and according to phone support you have to get it from the label on the box.

Hi Michael, thank you for sharing your experience. We appreciate your feedback on the fuel level visibility and support responsiveness. We'll pass your comments to our team to improve!

The generator is very quiet and the customer service is awesome.

Thanks, Mike!

Worked out great. I still think Honda's
Generators are quiter. The Flex Power would reve up and down a lot. Only had a cpap and phone charger plugged in to Generator. 10 hours.
Had a 1500 watt heater would run 6 hours. Maybe should of read more reviews. We were in an Ez up Qube tent.

Thanks for your review!

Took a gamble on this unit And so far all is good with 18 hours on genset.
The one problem is the 30 amp Rv plug design is just poor . You CAN NOT plug one flush ( no gaps ) without modifying the plug. ( can send pictures later if you want ) also communications was a challenge finding who would be able to service the unit. But I received a phone call from a Kayla Ault who was very informative on the 3300i
Let’s hope for the best ,no youtube or anything out there on the web about this unit never heard it run before
Again so far all is good 🤞
James

Flex Power® 3300i Silent Portable Inverter Generator- Gas Only

Built for the Extreme. Trusted by Pros.

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