RVMP Flex Power 3300i Review: Power, Fuels & Home Backup

How much power does the RVMP Flex Power 3300i give you?

On gas, this model is rated for 2,700 running watts and 3,300 starting watts. Running watts are the power available while your appliances are on. Starting watts are a short burst to help things like refrigerators and pumps turn on. You cannot use that bigger number for appliances that need steady power.

Fuel	Running watts	Starting watts
Gasoline	2,700 W	3,300 W

Starting watts vs. running watts, explained →

The details for this model

Model: 3300i. Manufacturer part number: 220470. These are published specifications, not results from our own testing. If a detail is missing, we leave it marked rather than use a number from a similar generator.

A detail to confirm: The primary page includes inconsistent running-output language. The specification list says 2,700W running / 3,300W starting. Do not substitute the 3300iR remote model.

How it starts: Pull cord
Voltage: 120V
Gas tank: 1.53 gal
How long it runs: Not confirmed for this model
Weight: 46.2 lb
Size (L × W × H): 17.5 L × 11 W × 19.5 H in
Outlets: Not confirmed for this model
Generator type: Inverter
Power smoothness (THD; lower is generally smoother): Not confirmed for this model
Carbon monoxide shutdown: Not confirmed for this model
Noise: Not confirmed for this model
Warranty: 2 years

A 120V outlet powers ordinary household plug-in devices. Some pumps and larger equipment need 240V. Inverter models use electronics to control the electricity they supply. THD measures how smooth that electricity is; a lower number generally means smoother power. Check your device instructions before connecting electronics.

Sources: Manufacturer specifications / manual ·

How long will it run?

We have not confirmed a runtime figure that says how much power was being used. The listed gas tank holds 1.53 gal. The more power you use, the sooner you will need fuel. A runtime measured at 25% load means the generator was only supplying a quarter of its running power, not working flat out.

Keep approved gas containers, rotate stored fuel, and plan where you can refill them. A bigger wattage number will not help if you run out of fuel. Read our fuel-storage guide →

What can you run during an outage?

Start by listing the appliances you need most. Check both their running watts and the extra power they need to start. A refrigerator, for example, may need much more power for a moment when its compressor kicks on.

Here is an example, not a test of this generator: a refrigerator using 600 running watts, plus 100 watts of lights and 100 watts for a router and other small devices, adds up to 800 watts. If that refrigerator needs 1,800 watts to start, the total briefly reaches 2,000 watts. Your appliances may use different amounts.

That example is within the listed gasoline running and starting ratings. You still need to check your own refrigerator, each outlet’s limit, and anything else that may turn on at the same time. If you use propane or natural gas, check those ratings separately.

A 1,500-watt heater uses a lot of power on its own. Follow its connection instructions; many portable heaters must plug directly into a suitable wall outlet. This review does not confirm 240V output for this model. Do not choose it for a 240V pump or air conditioner without checking that first. Work out how much power you need →

What we like and what to consider

Reasons to consider it

A gas-only setup with no fuel switching.
2,700 running watts on gas.
Inverter design, which can be useful for compatible electronics.

Things to keep in mind

It weighs 46.2 lb. Make sure you can move and store it.
No confirmed propane rating is available.
There is no complete noise test to compare with other models.

What owners are saying

We do not have enough owner feedback for this exact model to give a fair summary. Reviews for a similar generator, or another option on the same Amazon page, may describe a different machine. Before buying, check recent reviews for the full model number and find out how the seller handles service and returns.

Starting, moving, and maintenance

The listed starting options are: pull cord. Practice starting it before an outage so you know you can use it when needed. It weighs 46.2 lb. Wheels can help on level ground, but they do not make stairs or lifting into a vehicle easy.

The listed warranty is 2 years. Read the full terms, including whether your seller and intended use are covered. Follow the manual for oil type, oil changes, and storage. Keep track of running hours during a long outage. See our maintenance guide →

Other generators to compare

Honda EU3200i →

The EU3200i adds fuel injection and more running power than the EU2200i while keeping a portable inverter design. It is still 120V only. The Amazon listing and manufacturer page use slightly different model codes, so confirm the version before ordering accessories.

2,600 running watts on gas · Gasoline · 120V

Champion 201050 →

This portable dual-fuel inverter powers compatible 120V appliances. Switching to propane reduces its running power by 300 watts. The RV outlet is rated for 30A, but the generator itself provides up to 25A while running on gas.

3,000 running watts on gas · Dual fuel · 120V

maXpeedingrods MXR3500 →

This gas-only inverter provides 3,000 running watts and 3,500 starting watts. It uses a pull starter, has a 1.1-gallon tank, and weighs 21.5kg, according to the manual. Its RV outlet does not increase the power available from the generator.

3,000 running watts on gas · Gasoline · 120V

Questions about the RVMP Flex Power 3300i

How much running power does it provide?

2,700 watts on gasoline. Starting watts are only available briefly, not for steady use.

Is it an inverter generator?

Yes, this model is listed as an inverter generator. Check your electronics’ power requirements before connecting them.

Can I use it in a garage if it has CO shutdown?

No. Never run a generator in a garage, even with the door open. Use it outdoors at least 20 feet from homes and openings, with exhaust pointed away. Carbon monoxide shutdown is extra protection; it does not make indoor use safe.

Can I connect it to my house?

Check the voltage and outlets before planning a home connection. Have an electrician choose and install the right transfer equipment and check the generator’s wiring setup. Never connect a generator to a household wall outlet.

Our take

Should you consider the RVMP Flex Power 3300i?

This RVMP 3300i uses a pull starter; it is different from the remote-start 3300iR. It is a compact inverter for 120V appliances. The manufacturer page gives conflicting running-watt figures, so use the lower 2,700-watt figure until the correct manual is confirmed.

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Where the information comes from

We use the sources below to compare specifications and features. We have not personally tested this generator.