FAQ

Generator General Questions

The terms "Hybrid" and "Dual Fuel" on our generators are describing our generators ability to run on both propane or gasoline.

DuroMax portable generators will output an industry standard total harmonic distortion (THD) rating of about 12%-20% depending on load applied. They will produce a sine wave, not a modified or square wave. This is perfectly acceptable for running common commodities found in your home such as TVs, computers, your appliances, etc.

THD is a measure of the deviation of a sine wave from a "perfect" sine wave. All electricity, including power company electricity, has measurable THD.

If you have a specific item that requires less than 5% THD such as a UPS style battery backup, a pellet stove, or high efficiency furnace control board, we recommend purchasing a DuroMax Inverter Generator that provides a less than 5% THD.

Please consult your specific appliance manufacturer to determine if the appliance requires low THD (less than 5%) to operate properly.

Both Series feature DuroMax CO Alert, but the warranty and panel features vary by model. Please see the product specifications for the specific models you are interested in.

Our generators will be designed by our engineering team in Ontario, California, and built overseas to our specifications.

Yes, all our electric start generator models include the 12V battery needed for the electric start.

DuroMax does not have natural gas conversion kits availalable. Any use of aftermarket parts will void the generator warranty.

Currently only our inverter generators are safe to run sensitive electronic equipment that requires under 5% THD. Our inverter generator models will produce clean power that's safe for sensitive electronics.

DuroMax generators are equipped with oversized mufflers to reduce noise as much as possible. The noise generated is due to the engine and not the muffler. We don't recommend the use of any 3rd party muffler silencers to lower noise. Please note that any modifications to the existing exhaust system can void your warranty and violate emission standards.

Yes, all our dual fuel generators will include the propane regulators and propane hose needed for a propane tank 60 lbs or less.

DuroMax and DuroStar are sister brands. Both are built to the same quality and standards. Please note specifications may vary from model to model.

Home Backup Questions

Yes, all our generator models will be compatible with a transfer switch or interlock kit.

The generator can run continuously for as long as fuel is supplied to it, but the generator will still need to be shut down momentarily to perform the scheduled maintenance recommendations shown in the generator manual as the maintenance becomes due.

No. Due to safety concerns with Carbon Monoxide build up we always recommend running the generator outdoors in a well ventilated space. The consumer product safety commission officially recommend running portable generators outdoors and at least 20 ft from any windows or doors.

Most of our generator models are compatible with an interlock kit, generlink, or 2 pole manual transfer switch. Inverter generators will require 3 pole transfer switch. Please see a local certified electrician for the best transfer switch option for your needs.

Most of our generator models will be floating neutral by default. Duromax inverter generators and a few other select models will have a bonded neutral please see product specifications for generator model.

Yes, all of our dual fuel generators will be capable of hooking up to a home propane tank as long as your using the original propane hose and regulator provided in the connection, and feeding the generator the correct PSI based on the model. Please see your local gas company or plumber for assistance with the connecting your generator to a home propane tank.

No, we currently don't offer any aftermarket remote start kits for our generators at this time.

All our DuroMax generators will be equipped with an overload protection breaker that will flip and cut off the power in the event of an overload.

All our dual fuel generators 5500 watt or lower will require 11 inches of water column to operate properly, and all our dual fuel generators 8500 watt or larger will require at least 3 PSI of pressure to operate properly. Please ensure you use the original propane hose and regulator provided.

First turn the main breaker in the interlock or transfer switch off; then you'll want to shut he geneator breaker "off". Finally, turn the key or press the push start button to shut the generator off, and allow the unit to power down before disconnecting the adapter cords. If using propane or natural gas shut off the supply and allow the unit to stop running.

Generator Maintenance Questions

During the first 6 to 8 hours of use with our generators we recommend using conventional oil and keeping the generator load under 50% of its rated capacity to assist with the break in period; then after the break in period is complete we'd recommend changing the oil with either synthetic or conventional oil. If necessary the load break in requirement can be disregarded in an emergency situation.

Our generator models can use either 30W, 10W-30, or 5W-30 oil in synthetic or conventional depending on climate. Please see manual for further information.

Yes, you can use any 12V trickle/maintenance charger that’s compatible with SLA batteries.

Step 1: Move the main breaker to the off position.
Step 2: Allow the generator to run for 3-5 minutes.
Step 3: If running on propane or natural gas simply turn off the fuel source; then the battery switch to the off position. If running gasoline turn the generator off by setting the key switch or rocker switch to the off position; or if your generator has a push button start, then hold the push button for 3 seconds to shut the generator off and turn the battery switch to the off position.
Step 4: Store the generator. Please note do not obstruct any ventilation openings & keep the generator in a cool dry area.

Step 1: Move the main breaker to the off position.
Step 2: Allow the generator to run for 3-5 minutes.
Step 3: If running on propane or natural gas simply turn off the fuel source. If running on gasoline shut the generator off by moving the fuel valve to the "off" position and allowing the generator to stall out.
Step 4: Turn the key switch or rocker switch to the off position; or if your generator has a push button start, turn the battery switch to the off position.
Step 5: Add fuel stabilizer and store the generator. Please note do not obstruct any ventilation openings & keep the generator in a cool dry area.

Step 1: Move the main breaker to the off position.
Step 2: Allow the generator to run for 3-5 minutes.
Step 3: If running on propane or natural gas simpley turn off the fuel source. If running on gasoline turn the generator off by moving the fuel valve to the "off" position and allowing the generator to stall out.
Step 4: Turn the key switch or rocker switch to the off position; or if your generator has a push button start, turn the battery switch to the off position.
Step 5: Fully drain the fuel tank.
Step 6: Drain your carburetor bowl.
Step 7: Remove the spark plug.
Step 8: Place 2 tablespoons of oil into the spark plug hole, and pull the recoil to lubricate the cylinder.
Step 9: Remove battery and place on separate trickle charger.
Step 10: Store the generator. Please note do not obstruct any ventilation openings & keep the generator in a cool dry area.

We could assist you with all parts orders if you contact us at 844-DUROMAX option 1.

Yes, all of our electric start generator models will automatically recharge the onboard battery while the generator is running.

The maintenance schedules can vary between our generator models, but all models will have an hour or lifetime hour intervals required for maintenance. Please see your specific generator manual under the "Maintenance schedule" section for more details.

If your having trouble with any of our products please contact our knowledgeable service technicians at 844-DUROMAX, or submit a support ticket here, or see our service center locator to find the closest service center to your location here.

Generator Usage Questions

We recommend using 5W-30 oil if your using the generator in below freezing temperatures to assist with starting. In extremely cold regions it might be necessary to use a gasoline additive if using gasoline, or a propane tank warmer if using propane.

The automatic idle control feature is mainly used for jobsites to help lower the RPM and conserve fuel while the generator isn't drawing a load, and once a load is demanded the generator will return to the normal RPM and fuel consumption rate. Please note we don't recommend using the idle control feature with direct home connections due to low wattage appliances with constant power needs.

We don't recommend running our generators in a direct rain downpour or snowstorm without some type of overhead protection to keep the generator dry while operating. I.E. Gentent.

All our dual fuel generator models will only run on the propane in the vapor form.

Yes, all of our electric start generator models will automatically recharge the onboard battery while the generator is running.

The recharge indicator light on our generators is just letting you know that the generator is recharging its onboard battery and this light will stay on until the 12V battery is recharged to 12.6V or greater.

Yes, our electric start generators can still be started with the pull start feature even if the battery dies.

We recommend using clean, fresh, unleaded gasoline with an 87 Octane or greater with a 10% or less ethanol cut.

Not normally for backup home power. This answer can vary by location. Please consult a certified electrician for local grounding codes in your area.

Yes, you can use any 30W, 10W-30, or 5W-30 synthetic oil in our generators after the break in period.

Engine Questions

Our DuroMax engines will be capable of hooking directly to any 12V battery with appropriate cranking amps.

Yes, the electric start engines will recharge the battery while the engine is running. The XP7HPE, XP16HPE, and XP18HPE will output a 1.5 amp charge. The XP23HPE and XP35HPE will output a 3 amp charge.

The low oil sensor can be disconnected by locating the yellow or black wire that's leading into the crankcase block, and following the wire away from the block until you locate the first plastic green wire connector on the line. After locating the green connector, pull the connector apart grasping both ends of the plastic connectors until the wires are separated. Once the wires have been separated the oil sensor will be successfully disconnected.

All our DuroMax engines will have a counter-clockwise rotation if facing the engine shaft.

Yes, all our DuroMax engines are equipped with a cast iron cylinder sleeve.

The key switch can be separated from the engine by extending each of the color coded wires, and leading a ground wire from the bare metal on the key switch to the bare metal of the engine block.

Our single cylinder engines will have splash oil cooling. Our V-Twin engines will have both splash and pressure oil cooling, and an oil cooler.

During the first 6 to 8 hours of use with our engines we recommend using conventional oil ; then after the break in period is complete we'd recommend changing the oil with either synthetic or conventional oil.

Our engine models can use either 30W, 10W-30, or 5W-30 oil in synthetic or conventional depending on climate. Please see the manual for further information.

We recommend using clean, fresh, unleaded gasoline with an 87 Octane or greater with a 10% or less ethanol cut.

Pressure Washer Questions

The XP2700PWS will include 4 different nozzle types ( 0°, 25°, 40°, and Soap Nozzle). The XP3100PWS will include 6 different nozzle types (0°, 15°, 25°, 40°, Soap Nozzle, and Turbo Nozzle).

We only recommend using soap or detergents that specifically state that it is "safe for use with pressure washers" or "made for pressure washers".

Yes, all of our pressure washers will include the spray wand, hose, and nozzles in the box.

Our pressure washer models can use either 30W, 10W-30, or 5W-30 oil in synthetic or conventional depending on climate.

No, bleach can cause internal damage to the pressure washers spray wand, hose, and pump seals. We only recommend using soap that specifically labels "safe for use with pressure washers" or "made for pressure washers".

All our pressure washers will be equipped with a thermal relief valve rated for 140°F.

All pressure washers will require some type of periodic maintenance that can vary between models. Please see your specific pressure washer manual under the "Maintenance schedule" section for more details on the required maintenance timeframes.

We recommend using clean, fresh, unleaded gasoline with an 87 Octane or greater with a 10% or less ethanol cut.

Our pressure washers will have a detergent tank with a 38.4 oz capacity.

No, hot water can damage the pressure washer pump. The water temperature fed to the pressure washer should never exceed 100°F.

Water Pump Questions

The DuroMax water pumps will have a cast iron impeller and volute.

No, hot water can damage the engine. The water temperature fed to the water pump should never exceed 100°F.

The water pump models can use 15W-40 oil in synthetic or conventional depending on climate.

DuroMax water pumps bodies are made of cast aluminum.

The water pump hose fittings feature standard NPT threading.

The DuroMax high pressure water pump is self priming. The semi-trash pumps will require that you fill the pump body and suction hose full of water before starting.

The high pressure water pump is 116 PSI, DuroMax semi-trash pumps are rated in gallons per minute and can be damaged if pressurized.

DuroMax semi-trash water pumps will pass 1/4 grit, the high pressure pumps are intended for clean water.

We recommend using clean, fresh, unleaded gasoline with an 87 Octane or greater with a 10% or less ethanol cut.

No, reducing the hose will pressurize the pump body and may cause permanent damage.