What a Portable Generator Costs to Buy and to Run

What a portable generator costs before you run it

Short answer: On September 29, 2026, manufacturer list price is $529 MSRP for the Westinghouse WGen3600 and $609 MSRP starting at that figure for the Generac 49ST. The Honda EU2200i is $1,199 MSRP, and it is only a cost contrast, not the machine this page is about. On the WGen3600, a full 4.0-gallon tank at the U.S. regular price of $4.465 a gallon for the week ending September 28, 2026 works out to $1.2757 an hour at the stated 25 percent load and $1.7010 an hour at the stated 50 percent load. Those rates assume the stated hours consume the whole tank. They are not a printed gallons-per-hour figure, and they are not a five-year cost.

I live in Washington State and I use a truck-bed camper. A windstorm on the hill, or a night with no hookup, is when a portable generator and a battery box are the two bills I actually compare. This page is buy price and fuel price from manufacturer pages opened on September 29, 2026. It is not a ranking, and I am not reporting a test of these machines.

These are MSRP or manufacturer list prices. They are not a Home Depot or Lowe’s shelf price.

Manufacturer list prices on September 29, 2026

Machine	Price on the maker’s page	How it is shown
Westinghouse WGen3600	$529	MSRP
Generac 49ST	$609	MSRP starting at $609
Honda EU2200i (cost contrast only)	$1,199	MSRP
Jackery Explorer 1000 v2	$559	Power station alone
BLUETTI AC180	$449	The 1,152 Wh power station, not a kit

The Westinghouse WGen3600 page shows 529.00 MSRP. The Generac 49ST page shows MSRP starting at $609.00 for the 3600W portable generator with COsense. The Honda EU2200i page shows MSRP $1,199. I am stating that MSRP only. I am not explaining a footnote beside it.

The Jackery Explorer 1000 v2 page shows $559.00 for the power station alone. The BLUETTI AC180 page shows 449.00 for the AC180 1,152 Wh power station. Kit prices and a compare-at figure in that same HTML are not the price I am using.

The Champion 201286 page did not display a price. I am not inventing one. Champion is here for watts, tank, run time, and the oil schedule, not for a list price.

Output, tank, fuel type, and stated hours

Westinghouse WGen3600

The WGen3600 product page lists gasoline running watts of 3,600 and gasoline peak watts of 4,650, with recoil start. Fuel tank capacity is 4 gal (15 L). Gasoline run time at 25 percent is 14 hours. At 50 percent it is 10.5 hours. A bullet on the same page says up to 14 hours on a 4 gal fuel tank.

The WGen3600c user manual lists fuel capacity of 4.0 gallons (15 liters) and fuel type as unleaded gasoline, 87–93 octane, ethanol content of 10 percent or less. Its maintenance schedule says change the engine oil after the first 25 hours or the first month, then after 50 hours or every 6 months. A footnote says to change the oil every month when operating under heavy load or in high temperatures. No oil price was opened, so that schedule is not added to the hourly fuel figure.

Champion Power Equipment 201286

The Champion page lists gasoline starting watts of 4,375 W, running watts of 3,500 W, capacity of 4.7 gal, and run time at 1/2 load of 12 hours. It says the generator will run for up to 12 hours at 50 percent load when the 4.7-gallon tank is full. The page lists Inverter as No.

The 201286 operator manual says change oil at the first 5 hours (break-in), then every 100 hours or annually, and every 50 hours or annually if operating under heavy load or in hot environments.

I am not dividing Champion’s 4.7 gallons by 12 hours to invent a fuel cost. That worked example was not sourced.

Generac 49ST, left out of the gasoline math

The Generac page lists running watts of 3,600, starting watts of 4,500, a fuel tank of 3.7 gal, and run time at 50 percent load of 9.3 hours. Body text also says GP3600. The page title says gas powered. The specifications field for fuel type reads Gaseous. Those two lines were not reconciled.

I am not claiming the 49ST runs on gasoline, and I am not upgrading “Gaseous” to natural gas or propane. The tank size and the 9.3-hour figure stay as printed specs. They do not enter the cost example. The only Generac dollar figure I am using is MSRP starting at $609, as of September 29, 2026.

Honda EU2200i, cost contrast only

The EU2200i product page lists AC output of 120 V, 2,200 W max (18.3 A), and 1,800 W rated (15 A). Fuel tank capacity is 0.95 gal. Run time per tankful is 3.2 hours at rated load and 8.1 hours at 1/4 load. MSRP is $1,199.

The owner manual lists fuel tank capacity of 0.95 US gal (3.6 L). Engine oil is changed at the first 20 hours, then every 6 months or 100 hours. I use this model only so a smaller tank and a higher list price can sit beside the WGen3600. It is not the subject of the page.

Fuel per hour if the stated hours use a full tank

Hourly cost is tank gallons divided by the manufacturer’s stated hours, times the EIA price. The gallons-per-hour result is that division. It is not a rate the manufacturer printed.

The EIA Gasoline and Diesel Fuel Update, release date September 29, 2026, lists U.S. regular gasoline at $4.465 in the 09/28/26 column. Prices include all taxes. The same table lists $4.319 for 09/14/26 and $4.478 for 09/21/26. I am using $4.465, the national average, not a Washington pump price, and I am not computing a change between those weeks.

The EIA units page gives a sample factor of 120,214 Btu per gallon of motor gasoline, recalculated each year, with current factors updated annually in Appendix A of the Monthly Energy Review. That Btu figure is not used in the dollar-per-hour example.

WGen3600 at 25 percent and at 50 percent

At the stated 25 percent load, (4.0 / 14) x 4.465 = $1.2757 per hour. Implied use is 0.285714 gal/h, tank divided by stated hours, not a printed rate.

At the stated 50 percent load, (4.0 / 10.5) x 4.465 = $1.7010 per hour. Implied use is 0.380952 gal/h, also derived, not printed.

I am assuming each stated run time consumes a full 4.0-gallon tank. The page also says up to 14 hours, so fuel use could be lower if a tank lasts longer. Twenty-five percent and 50 percent are the manufacturer’s stated load points. One-quarter of the 3,600 running-watt rating is 900 W only as arithmetic, and half of it is 1,800 W only as arithmetic. Neither is a measured appliance load. The example excludes oil, starting, transport, and depreciation. I am not interpolating between 25 and 50 percent, and I am not writing a five-year cost.

On the camper I treat those as two published points and nothing in between. A lighter pull at the stated 25 percent point is the $1.2757 hour. The stated 50 percent point is the $1.7010 hour.

Honda contrast, same price per gallon, same full-tank assumption

At 1/4 load, (0.95 / 8.1) x 4.465 = $0.5237 per hour, or 0.117284 gal/h derived. At rated load, (0.95 / 3.2) x 4.465 = $1.3255 per hour, or 0.296875 gal/h derived. Honda did not print gal/h. The lower hourly fuel figure belongs to a 0.95-gallon tank and a $1,199 MSRP, against a 4.0-gallon tank and a $529 MSRP. That is the contrast. It is not a prompt to rebuild this page around the EU2200i.

Oil price, parts prices, a residential electricity rate, and efficiency were not all opened. Without them I stop. I do not stretch $1.2757 into a multi-year total.

A battery box is a different purchase

The Jackery Explorer 1000 v2 lists 30.4 Ah / 35.2 V DC (1,070 Wh), with AC output of 1,500 W rated and 3,000 W surge, at $559 for the power station alone.

The BLUETTI AC180 is listed as a portable power station at 1,800 W and 1,152 Wh. The price I am using is $449 for that 1,152 Wh configuration, not a kit.

I am not stating runtime hours for either box. Those hours were not calculated. Setting $449 or $559 next to $529 compares what you pay to buy. It does not say which one is cheaper to own, because I do not have an electricity rate or an efficiency number.

How I separate the two tools is in a power station versus a gas generator. The boxes are collected under portable power stations. Using the generator to refill a box, rather than to carry the load all night, is charging a power station from a gas generator. Buying a battery box you can recharge from panels is a different decision: that buying guide.

I am not quoting a noise number. Nothing I will cite states both distance and load. How those ratings are read is in generator noise levels explained.

Where a portable generator has to sit

The CPSC release of January 30, 2026 (26-237) says never run a portable generator inside a home, garage, basement, crawlspace, shed, or other enclosed space. Opening doors or windows does not make it safe. Operate outside only, at least 20 feet from the house, not on a porch or in a carport, with the exhaust pointed away. CPSC says carbon monoxide from a gasoline portable generator can kill in minutes, and that an average of nearly 100 consumers die in the U.S. each year from CO poisoning associated with portable generators.

The CPSC generator safety guide says never use one indoors or in a garage, basement, or shed, and to use it outside, well away from windows, doors, and vents. It says one generator produces as much CO as hundreds of cars and can incapacitate and kill within minutes.

The NFPA generator tip sheet says never use a generator in an attached garage, even with the door open, and to place it outdoors at least 20 feet from doors, windows, and vents. I am not blending that wording with CPSC’s “20 feet from the house” into a new distance. Both say at least 20 feet. NFPA names doors, windows, and vents. CPSC also rules out a porch and a carport.

OSHA’s portable-generator fact sheet says never use a generator indoors or in garages, crawl spaces, and basements, and that open windows and doors may not prevent CO buildup.

The CDC generator safety page, reviewed August 21, 2026, says portable backup generators produce carbon monoxide, an odorless, colorless gas that kills without warning. The extracted text does not restate the placement rule. Placement stays with CPSC, NFPA, and OSHA.

On the truck, that means off the camper, not under a closed cap and not in a carport. Exhaust points away from my rig and the next one. Twenty feet is the published figure, not a distance I paced off at a campsite.

Do not feed house wiring through an outlet

CPSC Safety Alert 5123 says never power house wiring by plugging a generator into a wall outlet. CPSC calls that backfeeding. It is an electrocution risk to utility workers and neighbors on the same transformer, and it bypasses some built-in household circuit protection.

NFPA says a connection from a portable generator to house wiring requires a qualified electrician to install a properly rated transfer switch, in accordance with the National Electrical Code and applicable state and local electrical codes. The tip sheet names the code and does not quote a section. I did not open the code text, so I am not adding a section number. The instruction I will repeat is the one the sheet actually gives: a qualified electrician, and a properly rated transfer switch, before a portable generator is connected to house wiring.

OSHA says do not attach a generator directly to a structure’s electrical system unless a qualified electrician has installed it with a transfer switch. Without that switch, a direct attachment can energize wiring for great distances and can electrocute utility workers.

The Honda manual says standby connections to a building electrical system must be made by a qualified electrician, must isolate generator power from utility power, and must comply with applicable laws and codes. Improper connections can backfeed utility lines, may electrocute utility workers, and the generator may explode, burn, or cause fires when utility power is restored. Some areas require registration with the local utility. Honda gives no code section number either. I am citing that warning from the contrast model’s manual, not offering a wiring method.

I am not plugging a portable generator into the camper’s shore inlet or into a wall outlet at the house. The moment the plan is to power the building, every source above points to a qualified electrician. The $1.2757 hour does not change that.