Quiet portable inverter generators by Flex Power

  • Free ShippingContiguous U.S.
  • 2-Year WarrantyOn every generator
  • 30-Day Money BackExchange or refund
  • Customer Approved★★★★★ 4.6 avg rating
  • USA ENGINEEREDDeveloped in Ohio
Flex Power technician checking a generator in the Ohio shop

PatentedAmerican Ingenuity.

Engineered in Ohio since 2017. RVMP built its name on clean, quiet power for life on the road, and every Flex Power® generator inherits it, with dual-fuel flexibility and inverter output safe for your most sensitive electronics.

Shop inverter generators →Shop installed generators →

Silent Series

Compare all
FLEX POWER®

4500ies Dual Fuel

4500W start57 dBDual fuel30A RV
$1,099Regular price$1,199 Save $100
FLEX POWER®

6500ies Dual Fuel

6500W classDual fuelElectric start30A RV
$1,399
FLEX POWER®

6500ies Gas

5.0 (2)
6500W classGasElectric start30A RV
$1,299
FLEX POWER®

4500ies Gas

4.8 (44)
4500W start57 dBGas30A RV
$849Regular price$999 Save $150
FLEX POWER®

3300ies Dual Fuel

4.6 (5)
3300W startDual fuelElectric start30A RV
$779
FLEX POWER®

3300i

4.5 (18)
3300W start46 lbsGas30A RV
$639Regular price$779 Save $140
FLEX POWER®

2200i

4.1 (8)
2200W startGasLightweight
$519Regular price$599 Save $80
Your Total EXAMPLE RESULT
Running watts 1,185 W
Peak — with largest surge 1,935 W
YOUR MATCH Flex Power® 2200i2,200 starting watts · from $519. Light-duty backup for the essentials.

Watt size
do you need?

Check off what you want to run, like a fridge, RV air conditioner, sump pump or laptops. The calculator adds it up, includes the startup surge, and matches you to the right Flex Power® generator.

Find my generator size →Free. No sign-up needed.
  • Dual fuel
  • 9+ patents
  • 100,000+ in the field
  • Engineered in the USA
  • Under 72 dB
  • SafeCO™ CO protection
  • 30-amp RV ready
Close-up of a Flex Power inverter generator control panel

Portable Clean Power

Flex Power manufactures your go-to portable inverter generator for life on the move. With features like electric start and whisper-quiet operation, it’s built to power your RV, campsite, tailgate, or home backup setup—without breaking a sweat (or the silence). Reliable. Easy to fire up. Ready when you are.

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Power any adventure

Campsites, tailgates, RVs or backup at home. There’s a quiet Flex Power® generator built for it.

4500ies

2200i

3300i

6500IES

What owners say

4.6
Rated 4.6 out of 5 Based on 171 verified reviewsRead all reviews →

Due to the excellent and diligent efforts of Grant and the staff at RVMP, I received the 4500 watt generator I ordered well before my departure date. The Onan generator in my RV went out while en route to Florida. What a blessing they are.

Jim F.RV owner · 4500 watt generator
5 out of 5 stars
“Best generator I have ever owned. Remote start is awesome. This is my second purchase.”
Peter F. Verified buyer 4500ies Gas
5 out of 5 stars
“Set up was easy. Fired right up with both hand pull and with key fob. Quiet as advertised. Very pleased with the weight and dimensions.”
Russell B. Verified buyer 4500ies Gas
5 out of 5 stars
“Shipped quickly, no messing around, and it is quieter than Honda and lighter. Very nice unit.”
Randall L. Verified buyer 4500ies Gas

Questions,
answered.

From storm prep and sizing to shipping and warranty. Still stuck? Our U.S.-based team is happy to help.

(855) HappyRV support@rvmp.co Mon–Fri, 9am–5:30pm ET
Find my generator size →See all FAQs →

Storm & home backup

Can a portable generator power my house during an outage?

It can power what matters most: fridge and freezer, sump pump, furnace fan, lights, Wi-Fi and phones. For most homes that’s under 4,500 watts. A whole-home standby system runs $12,000–$20,000 installed; Flex Power portables are $519–$1,399 and ready the day the box arrives.

How do I run my furnace or well pump?

Furnaces and well pumps are hardwired, so they don’t have a plug. A transfer switch or interlock kit, installed once by a licensed electrician, lets your generator feed those circuits safely. Well pumps draw a big surge when they start, so size for that, not just the running watts.

Check what size you need →
Gas or propane for emergency backup?

Our Dual Fuel models (3300ies, 4500ies and 6500ies Dual Fuel) run on either, using a standard propane cylinder and the included regulator hose. Propane keeps for years without going stale, so it’s easy to have ready for an outage. For gasoline, use 87 octane or higher, ethanol-free if you can get it, and never E15 or E85.

Choosing a size

What size generator do I need?

Add up the running watts of everything you want on at the same time, then add the biggest startup surge. Fridges, pumps and air conditioners spike when they start. Most homes’ outage essentials come in under 4,500 watts. The wattage calculator does the math for you.

Use the wattage calculator →
Can I add more power later?

Yes. Two matching Flex Power generators (two 3300s, two 4500s or two 6500s) can be joined with a parallel kit for more power from one connection. Output stays 120V. Don’t parallel different sizes or other brands.

Shop parallel kits →

Quiet, safe & clean power

How quiet is Flex Power compared to Honda?

About the same, with more power for less. The 4500ies measures 57 dB at 23 feet; Honda’s EU3000iS is rated 58 dB. The Flex Power makes 4,500 starting watts to Honda’s 3,000, weighs 76 lbs to Honda’s 131 lbs, and costs about half as much.

See the full comparison →
Is it safe for my fridge, TV and laptop?

Yes. Every Flex Power generator is a true inverter with a clean sine wave under 3% total harmonic distortion (THD). Conventional generators run 15–25% THD, which is hard on the circuit boards in fridges, furnaces, TVs and laptops.

What about carbon monoxide?

Every Flex Power generator has CO auto-shutoff. A sensor watches for carbon monoxide building up and shuts the engine off if levels get unsafe. Always run your generator outdoors, well away from the house, with the exhaust pointed away from doors and windows. Never run it in a garage, even with the door open.

Orders, warranty & company

How fast will my generator ship?

Most orders ship from our Columbus, Ohio warehouse within 1–2 business days, and standard shipping is free in the contiguous U.S. You’ll get tracking by email as soon as the label is created. Need it faster? Call (855) HappyRV for an expedited shipping quote.

What’s the warranty and return policy?

Every generator has a 2-year warranty on manufacturing defects. You can return an unused item in its original packaging within 30 days of delivery. Contact support@rvmp.co first and we’ll send return instructions. Return shipping is paid by the customer.

Who makes Flex Power generators?

Flex Power® is a registered brand of RVMP (RV Mobile Power), founded in Columbus, Ohio in 2017 and a generator supplier to many leading RV manufacturers. We design and engineer every Flex Power generator in the U.S. and hold 9+ patents in inverter and cooling technology. Our portable inverters are built by manufacturing partners overseas to RVMP’s designs.

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