Why people choose this generator
Who this generator is built for
Good to know before you buy
Why dual fuel matters
Gasoline goes stale in months; propane stores for years and doesn't gum up a carburetor. In an extended outage, gas stations may have no power to pump — but a couple of 20 lb propane tanks in the garage keep you running. One-click switching means you use whichever fuel makes sense that day.
What 120/240V output actually means
The MXR6900DER gives you both 120V and 240V output via a dedicated selector switch, which matters for transfer switch use, heavier appliance planning, and more flexible backup setups. Many inverter generators only provide 120V. This one gives buyers more real-world options.
How loud is 62 dB?
Around 62 dB at 23 feet is much easier to live with than the harsher noise most buyers expect from open-frame generators — about the level of normal conversation. That matters for RV trips, home backup, and neighborhood-friendly use.
Runtime explained
Up to 10 hours on gasoline / 13.5 hours on propane at 25% load is closer to lighter essential use like refrigerator, lights, router, chargers, and selective electronics.
Up to 6.7 hours on gasoline / 8 hours on propane at 50% load is closer to heavier real-world use, where more appliances or tools are running at the same time. Propane runtime depends on tank size — the figures above reflect a standard 20 lb tank.
MXR6900DER specs
| Engine | 224cc 4-stroke OHV, air-cooled |
|---|---|
| Peak / running watts (Gasoline) | 6900W / 5200W |
| Peak / running watts (Propane) | 6100W / 4500W |
| Fuel type | Dual fuel — Gasoline / Propane (LPG), one-click switching |
| Voltage | 120V / 240V (selector switch) |
| Running amps | 30A @120V / 21A @240V |
| Inverter output | Pure sine wave, <3% THD |
| Noise | 62 dB (23 ft / 25% load) |
| Runtime | Gas: 10h @ 25% / 6.7h @ 50% • Propane: 13.5h @ 25% / 8h @ 50% |
| Fuel tank | 3.04 gal (11.5L) |
| Starting methods | Remote, electric, recoil + external emergency start port |
| Outlets | (2) 120V 20A (1) 120V 30A RV outlet (1) 120/240V 30A (2) USB |
| Safety | CO auto-shutdown alarm, low oil LED, overload LED, output ready LED |
| Eco Mode / Parallel ready | Yes / Yes |
| Certifications | ANSI/PGMA G300-2023, EPA Certified, UL 2201 CO Emission Tested |
| Weight | 101 lbs (46 kg) — wheels & telescopic handle |
| Dimensions | 22.8 x 17.3 x 19.7 in |
Let’s talk about MXR - MaXpeedingrods +
MXR (MaXpeedingrods) has been building high-performance engine parts since 2006 — connecting rods, crankshafts, turbochargers, and racing components. Generators came later, and that background shows in how they're built.
The MXR6900DER uses OEM-grade components throughout — not sourced-cheap aftermarket parts. The inverter electronics are designed for clean pure sine wave power, the dual-fuel system switches with one click, and the remote start is built in from the factory, not bolted on as an afterthought.
The 224cc 4-stroke OHV engine traces its roots to go-kart and small engine performance applications — a lineage that prioritizes reliability under sustained load, not just peak numbers on a spec sheet.
Most budget generators are designed around a price point. This one was designed around what the engine and alternator could actually do.
Real support from a real person
My name is Josh, and when buyers have questions about fit, outlets, startup load, propane vs. gas, RV use, or backup planning, they deserve better than generic copy and a support maze.
If you are trying to figure out whether this generator makes sense for your 30A RV, backup essentials, or electronics, call 314-833-8000 and talk through it before you buy.
Durvy Supply — Union, Missouri
314-833-8000 • sales@durvy.com
What this generator can actually run
RV Power Needs
| Appliance / Device | Running Watts | Startup Watts |
|---|---|---|
| RV Air Conditioner (13,500 BTU) | 1500 | 3000 |
| RV Air Conditioner (15,000 BTU) | 1800 | 3500 |
| RV Refrigerator | 400 | 1200 |
| Electric Water Heater | 1500 | 1500 |
| Microwave | 1000 | 1000 |
| Coffee Maker | 800 | 800 |
| Hair Dryer | 1500 | 1500 |
| CPAP Machine | 30-60 | 60 |
| Starlink Satellite Dish | 50-75 | 75 |
| Phone / Laptop Charging | 50-150 | 150 |
| TV / Electronics | 200 | 200 |
Home Backup Essentials
| Appliance / Device | Running Watts | Startup Watts |
|---|---|---|
| Refrigerator (Standard) | 600 | 1200 |
| Chest Freezer | 500 | 1000 |
| Sump Pump (1/2 HP) | 1000 | 2000 |
| Well Pump (1/2 HP) | 1000 | 2000 |
| Window AC (10,000 BTU) | 1200 | 2200 |
| Space Heater | 1500 | 1500 |
| Microwave | 1000 | 1000 |
| Washing Machine | 800 | 2000 |
| Garage Door Opener | 350 | 800 |
| Box Fan | 100 | 100 |
| Electric Blanket | 200 | 200 |
| CPAP Machine | 30-60 | 60 |
| Desktop Computer | 300 | 300 |
| Phone / Laptop Charging | 50-150 | 150 |
| Router / Wi-Fi / Starlink | 50-75 | 75 |
Events & Outdoor Power
| Appliance / Device | Running Watts | Startup Watts |
|---|---|---|
| Electric Griddle / Grill | 1500 | 1500 |
| Slow Cooker | 250 | 250 |
| PA / Speaker System | 500 | 700 |
| String / Event Lighting | 300 | 300 |
| Projector & Screen | 400 | 400 |
| Outdoor TV | 200 | 200 |
| Bounce House Blower | 1000 | 1500 |
| Phone Charging Station | 150 | 150 |
Common questions about the MXR6900DER
Support, Maintenance & Included Accessories
Yes, anytime. Call or text 314-833-8000 or email sales@durvy.com. We provide real support directly from our Union, MO location.
MXR6900DER Dual Fuel Inverter Generator, Owner's Manual, Spark Plug Socket Wrench, Oil Funnel, Screwdriver, Pressure Relief Valve Kit, Battery Charger (for the starter battery), and Remote Control.
Check engine oil, fresh gas, and air filter every use. Change oil after the first 20 hours, then every 50 hours. Check, clean, or adjust the spark plug yearly. Bonus of running propane: cleaner burn means less carbon buildup and longer intervals between deep maintenance.
Oil: Plain SAE 10W-30. Capacity is 0.74 qt (700 mL). Gas: 87 octane with less than 10% ethanol. Do not use E85 or E15. Propane: standard LPG tanks.
Connect the battery cable through the side panel before first startup. Always turn off the main power switch after use — a drained battery will prevent electric start. Storing over a month? Disconnect the battery cable. Run the generator at least 30 minutes every 3 months. If the battery dies anyway, the external emergency start port lets you jump it from an outside power source with one click.
Drain the gas. Pro tip: run the generator on propane for the last stretch or turn the gas switch OFF and let it burn the remaining fuel out of the lines. Disconnect the starter battery cable for storage over a month.
Dual Fuel & RV Power
One-click switching — no tools, no draining. Run gas when it's convenient, propane when you want longer storage life, cleaner burn, or lower maintenance.
Yes. A 30 amp RV typically requires up to 3,600 watts at 120V. With 5,200 running watts on gasoline (4,500 on propane), the MXR6900DER provides sufficient capacity for most 30 amp RV setups, including one RV rooftop air conditioner and standard appliances. It has a dedicated 120V 30A RV outlet — plug your RV cord straight in. Always confirm your specific load requirements before connecting.
In many setups, yes. It is a practical fit for 30A RVs. For best results, turn off Eco Mode before starting the AC compressor, and remember running watts are lower on propane.
No. Turn Eco Mode OFF before starting heavy loads so the engine is at full RPM for the initial surge. Turn it back on once the compressor is running.
Portable generators have a floating neutral. Many RV EMS systems require a bonded neutral. Resolve this by using a standard neutral-ground bonding plug in one of the 20A outlets.
Use a minimum 10-gauge heavy-duty cord for 30A service to prevent voltage drop and overheating.
Yes, the MXR6900DER is parallel ready. Parallel cables are sold separately — call us if you're planning a parallel setup.
Home Backup Planning
For many homes, it is enough for essentials like a refrigerator, freezer, lights, internet, chargers, and selective appliance use. It is not the same as full whole-house backup.
In an extended outage, gas stations may not be able to pump. Propane stores for years without going stale — a few 20 lb tanks on hand means you're covered, and you get up to 13.5 hours per tank at 25% load.
Some well pumps, yes, but startup load varies a lot. Call us at 314-833-8000 before buying so we can help size the load.
You must use a properly installed manual transfer switch. The 120/240V output makes it compatible with many standard transfer switches. Call us at 314-833-8000 and we're happy to review compatibility before you buy.
Typically, no. A 5200 running watt generator is not designed for whole-house central HVAC systems. It is better suited for window units, portable ACs, or small mini-splits.
Yes. It includes a CO sensor and will automatically shut down if dangerous levels of carbon monoxide are detected. Never run any generator indoors or in an enclosed space.
Performance & Electronics
Total Harmonic Distortion (THD) under 3% is the gold standard for clean power. It protects sensitive circuit boards in laptops, Starlink, and medical gear from electrical noise.
Yes. The pure sine wave output safely powers Starlink dishes, laptops, iPads, and dual-monitor setups without flickering or signal interference.
Yes. The stable <3% THD power is preferred for the sensitive motors and sensors in CPAP and BiPAP machines to ensure correct operation.
62 dB at 23 feet at 25% load — about the level of normal conversation, and far easier to live with than open-frame generators.
Gasoline: up to 10 hours at 25% load, 6.7 hours at 50%. Propane: up to 13.5 hours at 25% load, 8 hours at 50%.
Rated for altitudes below 5,000 ft. Normal operating range is 5°F to 104°F — below 5°F starting gets harder, above 104°F output decreases.
The overload LED will activate and the unit will cut power to protect itself and your gear. Simply reduce the load and reset.
