Meet the OEM generators RV manufacturers trust.
RVMP Flex Power® onboard generators are original equipment in new RVs from the industry’s biggest names — and a drop-in replacement for your aging Onan, installed at our Columbus, OH or Elkhart, IN facility.
Onboard power, matched to your rig.
Every Flex Power® installed generator runs on gas or propane and delivers clean inverter power that’s safe for laptops and TVs.
Compact, lightweight dual-fuel power at our lowest installed price.
- Runs on gas or propane — one unit
- Built-in inverter: clean power for laptops & TVs
- Under 100 lbs · 22″ × 16.9″ × 13.4″
- Quiet — no loud rev cycles
RVMP’s lightest generator — now with electronic fuel injection.
- EFI · 50-state CARB compliant
- RVMP’s lightest: under 90 lbs
- Runs on gas or propane — one unit
- Built-in inverter for sensitive electronics
4,000 watts in RVMP’s smallest 4kW generator ever built.
- EFI · 50-state CARB compliant
- Under 110 lbs, same compact 22″ footprint
- Runs on gas or propane — one unit
- Built-in inverter for sensitive electronics
Full-size power, built as a 100% drop-in Onan replacement.
- Fits the same space as your Onan
- EFI dual fuel · 50-state CARB compliant
- Remote start + emergency backup recoil start
- Just 3% harmonic distortion · 3-year limited warranty
Why Onan owners are switching.
Same space in your RV. A better generator in it.
| RVMP Flex Power® | Typical Onan | |
|---|---|---|
| Fits the space your Onan uses today | ✓ Drop-in | — |
| Gas or propane in one unit | ✓ | Separate models |
| Weight | Lighter | Heavier |
| Noise | Quieter | Louder |
| Fuel efficiency | More efficient | Less efficient |
| Clean power for electronics | 3% THD | Higher distortion |
| Remote start + backup recoil start | ✓ | ✗ |
| Auto shut-off fire prevention | ✓ | — |
| Installed by the OEM supplier | ✓ | — |
Comparison based on the RVMP Flex Power® 5500e vs. comparable competitor installed generators. Onan is a trademark of Cummins Inc.; RVMP is not affiliated with Cummins.
Which generator fits your RV?
Side-by-side specs for every Flex Power® installed generator.
| 2800i2,800 W | 2800e2,800 W | 4000e Mini4,000 W | 5500e5,500 W | |
|---|---|---|---|---|
| Best for | Vans, truck campers & Class B | Vans, truck campers & Class B | Class C & mid-size trailers | Class A, fifth wheels & large trailers |
| Power output | 2,800 watts | 2,800 watts | 4,000 watts | 5,500 watts |
| Gas or propane (dual fuel) | ✓ | ✓ | ✓ | ✓ |
| EFI · 50-state CARB | — | ✓ | ✓ | ✓ |
| Clean inverter power | ✓ | ✓ | ✓ | ✓ |
| Weight | Under 100 lbs | Under 90 lbs | Under 110 lbs | — |
| Footprint (L × W × H) | 22″ × 16.9″ × 13.4″ | 22″ × 16.9″ × 13.4″ | 22″ × 16.9″ × 13.4″ | Fits the Onan space |
| Starting at | $5,209 | $6,460 | $6,721 | $8,747 |
| Details | Details | Details | Details |
RVMP is the brand RV manufacturers trust.
Founded in 2017 in Columbus, Ohio and engineered in the U.S., RVMP supplies the generators that ship in new RVs — so replacing your Onan with one means getting the same equipment the factories choose.
“Absolutely the best purchase I’ve made in a long time.”
“The Onan generator in my RV went out while en route to Florida. Due to the diligent efforts of the staff at RVMP, I received the 4500-watt generator I ordered well before my departure date.”
Jim F.Onan replacement
“I explained my needs and they gave me personal service. It’s smaller, lighter, and I love it. I’m a fan!”
Darlene C.Verified customer
Limited time: $1,500 off installation
Hassle-free guarantee: our Director of Aftermarket will send you one email explaining how to get $1,500 off the installation of an RVMP generator. No marketing lists. No sharing your info.
- ✓ One personal email
- ✓ No marketing lists
- ✓ Never shared or sold
Our Director of Aftermarket will email you personally within 1 business day with everything you need to know about the $1,500 offer.
Not ready for a full install? Need a quick fix?
Flex Power® portable inverter generators deliver the same clean, quiet power — no installation required.
Good to know.
Will an RVMP generator fit where my Onan is now?
The Flex Power® 5500e is built as a 100% replacement for Onan installed generators and fits in the same space. Our compact 2800 and 4000e Mini models fit a 22″ × 16.9″ × 13.4″ footprint. We confirm fit for your specific rig before any install.
Where is the installation done, and how long does it take?
Installs happen at our Columbus, OH or Elkhart, IN facility and typically take a few days. We’ll walk you through timing so you can plan around it.
Can it run on propane?
Yes. Every Flex Power® installed generator is dual fuel — it runs on gasoline or propane from a single unit.
Is financing available?
Yes — 0% APR financing is available for qualified buyers through our lending partner, with customizable monthly payments.
What’s the warranty?
The Flex Power® 5500e is backed by a 3-year limited warranty and U.S.-based customer support. We’ll confirm coverage details for the model you choose.