Every generator box has a decibel figure on it, which makes the quietest generator for camping look easy to find. It is not. One maker measures at quarter load, another at 23 feet, a third at 22 feet, and a fourth says "as low as" and stops. The figures are real, and most of them cannot be set side by side.
We read the product pages, spec sheets and owner's manuals for twelve inverter generators and two power stations. Eleven of the twelve generators carry a noise figure. One maker states both the load and the distance, on one model. Here is who says what, what the national park rule really requires, and which generator to buy.
Our 7 picks are listed above, with full specifications for each.
Who states what
A generator's noise depends on how hard it is working and how far away you stand. A figure needs both to mean much. Here is what each maker gives.
- Load and distance. Only WEN, and only for the 56450iX: 58 dBA at quarter load, 22 feet.
- Load, at both ends. Honda lists quarter load and rated load for every model: 42 and 50 dB(A) for the EU1000i, 48 and 57 for the EU2200i, 54 and 58 for the EU3200i. Yamaha gives the same kind of range for the EF2200iS, 57 to 65 dBA. Neither states a distance.
- Load, quiet end only. WEN's 56235iX: 51 decibels at quarter load.
- Distance only. Champion: 53 dBA from 23 feet for its 2,500-watt unit, and 61 dBA from 23 feet for its 4,500-watt unit. No load is stated.
- Neither. Westinghouse says "as low as 52 dBA", and says it for both a 1,900-watt and a 3,900-watt generator.
- Nothing. Generac publishes no figure for the iQ3500, in the page, the spec sheet or the manual.
You will read that Honda and Yamaha measure at 7 meters, which is 23 feet. We looked for it on Honda's US product pages, in the Honda owner's manual and on Yamaha's US spec page, and did not find it. It may well be true. We cannot source it, so we do not say it.
Quarter load and rated load
An inverter generator slows its engine when little power is being drawn. So the quarter-load figure is the quiet end and the rated-load figure is the loud end.
Honda's EU2200i shows the gap: 48 dB(A) at quarter load, 57 at rated load. Nine decibels is a large difference. A maker that quotes only the quiet end, or says "as low as", is telling you about a generator charging phones, not one running a microwave.
This is also why economy mode matters. Honda's manual recommends Eco Throttle to further reduce noise whenever less than a full load is applied. Champion says its economy mode reduces engine speed for quieter operation. WEN's manual says to use its eco switch only below 75% of rated output. In practice: size the generator so that your normal load is a light one.
The 60-decibel rule in national parks
The federal rule for national parks is 36 CFR 2.12. It prohibits operating motorized equipment, and it names an electric generating plant as an example, in a manner "that exceeds a noise level of 60 decibels measured on the A-weighted scale at 50 feet".
Two details matter. First, the distance is 50 feet, and no maker measures at 50 feet. A box that says 58 does not prove compliance, and a box that says 61 does not prove a violation. We do not convert between distances. Second, the rule has another clause. Even below 60 decibels, noise is prohibited if it is unreasonable, considering the location, the time of day and the effect on other park users. So a generator that meets the number can still break the rule.
Campgrounds then add their own hours. The National Park Service says quiet hours are posted in most campgrounds, typically something like 10 pm to 6 am. Assateague prohibits generator use during quiet hours and bans generators entirely in some loops. Mount Rainier allows generators only in three two-hour windows a day. Check your campground before you pack.
Carbon monoxide: the part that matters more than noise
It is tempting to tuck a noisy generator behind a wall or a vehicle to muffle it. Do not. The Consumer Product Safety Commission's advice, in its words:
- "Never use portable generators inside homes or garages, even if doors and windows are open."
- "Use generators outside only, at least 20 feet away from homes with exhaust facing away."
CPSC says more than 100 deaths a year in the United States are linked to portable generators.
The manuals agree. Honda's says not to enclose or cover the generator with boards or a tent, even outside, and to place it so the muffler points the way the wind is blowing. Champion's says never to run one in an RV generator compartment, the back of an SUV, a camper or a truck bed.
Every generator we picked has a carbon monoxide shutoff: Honda calls it CO-MINDER, Champion CO Shield, WEN CO Watchdog, Westinghouse CO Sensor. Treat it as a last line of defense. It is not a reason to park the generator beside a window.
Sizing: one generator, two, or a battery
For an RV air conditioner, go by what makers state. Honda lists a 13,500 BTU RV air conditioner as an application for the EU3200i, and not for the EU2200i. Champion says two of its inverters on its 30-amp parallel kit will start and run a 15,000 BTU unit.
Two small units in parallel give you the output of a large one and the option of carrying only one on light trips. Honda says paralleling gives extra power without trading up to a larger, heavier generator, and that only identical units can be paired. No maker publishes a noise figure for a pair running together.
Check the outlet. A TT-30R outlet takes an RV cord directly. The Champion 4,500-watt, both Westinghouse units and the WEN 56450iX have one. Honda's EU3200i and Companion, and the Generac, use 30-amp locking outlets that need an adapter.
A power station suits small loads and places that ban generators. It has no engine, no exhaust and no fuel. It also has a fixed amount of energy: about 1,000 watt-hours in the two we checked.
How much should you spend?
Around $530 to $600 buys a 2,000-watt class inverter from Westinghouse or WEN, and the Champion sits in the same class. Expect a single noise figure with something missing from it.
Around $830 buys the WEN 56450iX, with 3,500 running watts, an RV outlet, and the best-qualified figure in the guide.
Around $1,000 to $1,200 buys a Honda EU1000i or EU2200i. What the extra money buys is the lowest published figures, stated at both ends of the load.
Around $2,800 buys the Honda EU3200i. It is the lightest way to run an RV air conditioner that a maker will put in writing, and few people will pay it.
Around $560 to $800 buys a 1,000 watt-hour power station at list price.
Mistakes buyers make
Comparing figures across brands as if they were measured the same way. They are not. Compare within a brand, and treat a gap of a few decibels between brands as unknown.
Reading "as low as" as the working noise level. It is the quietest moment the generator has.
Assuming a figure under 60 means park-legal. The park rule is measured at 50 feet and has a second clause about unreasonable noise.
Buying too small, then running flat out. A generator at rated load is at the loud end of its range all day. Honda's own figures put that 9 decibels above quarter load on the EU2200i.
Moving the generator closer to block the sound. Keep it at least 20 feet away with the exhaust facing away, as CPSC says.
Comparing runtimes without checking the load. WEN quotes runtime at half load. Most others quote quarter load.
New to the units? Read dBA explained. To decide what figure to aim for, see how quiet is quiet enough, room by room. If a product you already own has become noisy, see why your appliance got louder.
How we chose
We read the manufacturer's product page for every generator, and the spec sheet or owner's manual wherever one is published. We recorded each noise figure in the maker's own words, with the load and the distance whenever the maker gives them, and we said so when it gives neither. We compared running watts, weight, runtime at its quoted load, outlet type, carbon monoxide shutoff and warranty. We read the federal park noise rule, National Park Service campground pages and the Consumer Product Safety Commission's generator advice, and quoted them directly.
We did not measure decibels ourselves, and we did not convert any figure from one distance to another. We ranked makers that publish both ends of the load range first, then figures with a stated load or distance, then bare claims. One brand, Predator, is missing because its maker's site would not let us read its pages.
