Predator 3500 Inverter

~$799approx. list price

800 WLights, phones, router, a CPAP
2,200 WFridge, freezer and the essentials
4,000 WFurnace blower, sump pump or a window AC
7,500 WWell pump or a small central AC
18,000 WWhole home with central air

3,000 W running, 3,500 W surge — sustains the fridge, freezer and the essentials tier and everything below it.

Best forRVers and tailgaters who want quiet AC-running power for the least money and accept a short warranty.

The cult classic of the RV world. The Predator 3500 is the answer to 'why pay Honda prices?': 3,000 running watts, 57 dB super-quiet operation, electric start, and a digital readout for around $800, with periodic coupons taking it lower. Owners report five-plus-year lifespans with basic oil changes, and it starts 15k BTU RV ACs that make 2,200W units give up. Consumer Reports rates it surprisingly highly for noise and power quality. The trade-offs: 99 lbs with no folding handle makes truck-bed loading awkward, the oil fill is tilted and messy, carb varnish after storage is a common repair, the 90-day warranty is the shortest in the industry, and CARB-state buyers need the newer CO Secure version. Still the value benchmark for RV inverters.

From the spec sheet

Specifications

Running watts: 3,000 W
Starting watts: 3,500 W
Fuel tank: 2.3 gal
Runtime: 11 hrs @ 25% load (2.3 gal)

Type: Inverter Generator
Fuel: Gasoline
Noise: 57 dB
Outlets: 2x 120V 20A (5-20R), 1x 120V 30A RV (TT-30R), 12V DC
Transfer-switch ready: No
Weight: 99 lbs
Warranty: 90-day (extended plans available)
Model: 59137

RV-community cult favorite·57 dB, starts 15k AC·Perennial value benchmark

At a glance

Strengths

+Runs 15k BTU RV air conditioners that stall smaller inverters
+57 dB is legitimately quiet for 3,000 running watts
+Electric start with simple controls
+11-hour economy runtime
+Owner-documented fixes for its common carburetor faults
+Frequent Harbor Freight coupons drop it under $600

At a glance

Drawbacks

−90-day warranty is the shortest in the category
−99 lbs with no suitcase handle or telescoping pull
−Awkward tilted oil fill makes changes messy
−Carburetor gumming after storage is the top complaint
−No fuel gauge on older revisions; small 2.3-gal tank

Summarised from owner discussions and forums

Owner insights

The Predator 3500 is the generator owners buy for an RV, a mobile business or a hurricane closet, and the long-term record is better than its price suggests. One mobile tire-service owner documented 2,000 hours of daily, rain-and-sun use on regular gas; others have run 2017 and 2018 units ever since, and a Houston owner ran fridges, a freezer and a window AC on it for days after the derecho.

The ownership experience is carburetor-centric. Hunting idle and bogging under medium loads come up repeatedly, and the usual answer is to clean the pilot jet, ideally in an ultrasonic cleaner, or fit a replacement carb, put at about 30 dollars by one estimate. Higher-hour units add starter solenoids and idle trouble. Buyers should open a new box carefully: one unit arrived leaking and smelling of gas like a return, and a discounted return came with kerosene in the tank. Output is 120V only, which limits it on a home transfer panel.

Quiet, AC-capable power for the least money is the trade, for buyers who will do their own carb work. Its usual rivals are the Predator 5000 dual-fuel, which several end up owning alongside it, the WEN 3600 for its lighter weight, and look-alikes such as the Generac iQ3500 and the Champion 4500.

What owners like

+Documented high-hour duty: a mobile tire-service owner logged 2,000 hours at 8 to 12 hours a day with eco mode off, outdoors in Florida sun and rain on regular 87, and said he would pick it over a Honda again
+After the Houston derecho an owner ran two fridges, an upright freezer, a 12,000 BTU window AC and LED lighting for days, pausing the AC to run a microwave, air fryer or espresso machine
+A 2017 unit is still in regular camping and outage use on a battery tender, yearly oil changes and ethanol-free gas, and another has run his since 2018
+A roughly 30-dollar carburetor is one estimate of the likely worst case on a used unit, short of a bad inverter board, and an owner revived a neglected 454-hour Marketplace unit with a new head and carb
+The 30A TT-30R plugs straight into a travel trailer, and one camper shopper weighed a used one for running a single AC while boondocking
+Pairs well with a Predator 5000 dual-fuel: several owners keep both, and one alternated them through a six-day outage with gas in the 3500 and propane in the 5000
+Holiday pricing drops it from about 800 to 600 dollars, with early access for Inside Track members

Common complaints

−Hunting and bogging are recurring repair questions: one unit stalls past about 15 amps even after a carb cleaning, and for another that was hunting, others blamed a partly clogged pilot or idle jet, one saying an ultrasonic clean fixed the same problem on his
−Gasoline only; propane means an aftermarket conversion kit, which an owner added and another skipped in favor of a Predator 5000 dual-fuel
−Its 120V-only output complicates a home transfer panel: for one buyer's L14-20 panel, the answer was that a 120V feed would probably be OK only if limited to about 2,400 watts
−One new boxed generator arrived leaking and smelling of gas, which looked to someone like a return, and a store return bought at 300 dollars off had kerosene in its tank
−At 99 pounds it is a heavy lift, and one camper shopper leaned toward the WEN 3600 at about half the weight
−Wear parts show up with hours: a starter solenoid at 600 hours, unstable idle at 550, and a broken rocker-arm mount on a neglected 454-hour unit
−The factory warranty is 90 days, and one shopper found the 2-year extended plan pushed the price past what it was worth

Questions owners ask

Can it power my house through a transfer switch?

Only part of it, and only at 120V. One buyer's L14-20 transfer panel was wired to a few lights and outlets, the fridge and a gas furnace, and the answer was that feeding it from a 120V generator would probably be OK if limited to about 2,400 watts, while warning that the 30A 120V outlet on the 3500 and 5000 could be a problem on a shared-neutral circuit.

What can it run during a long outage?

An owner ran two fridges, an upright freezer, a 12,000 BTU window AC and LED lighting for days after the Houston derecho, switching the AC off briefly to run a microwave, air fryer or espresso machine. He adds that a second small window unit would trip it.

Why does it hunt or bog down under load?

Answers mostly point to the carburetor, specifically a partly clogged pilot or idle jet. One owner fixed the same problem by cleaning the carb in an ultrasonic cleaner, and another person put a replacement carb at around 30 dollars. If a clean carb does not fix it, the suggestions were checking the governor adjustment and pulling the spark arrestor in case the exhaust is blocked.

Can I convert it to propane?

Not from the factory. An owner added a propane kit to his 3500, though he had not used it yet. Another who considered a kit bought a Predator 5000 dual-fuel instead and kept the 3500 on gasoline, alternating the two through a six-day outage, which also gave him a backup if one machine failed.

Is a used or open-box unit a good buy?

Often, if it runs. One estimate puts a roughly 30-dollar carburetor as the likely worst case unless the inverter board is bad, one tinkerer bought a locked-up unit for 50 dollars to work on, and another revived a neglected 454-hour unit with a new head and carb. Check store returns and boxes too: one discounted return had kerosene in the tank, and a boxed unit sold as new arrived leaking and smelling of gas.

Head to head