Champion 100520 Generator: Complete Buying Guide

Champion 100520 8750-Watt DH Series — Full Review

The Champion 100520 is Champion Power Equipment's flagship open-frame portable generator in the mid-range segment. With a peak output of 8,750 watts on gasoline (7,500 watts running) and 7,875 starting watts on propane (6,250 watts running), this machine can power most of a mid-sized home's critical circuits — refrigerator, window AC unit, sump pump, lights, and several small appliances — simultaneously. That makes it a genuine whole-home backup candidate for people who don't need to run central HVAC or a well pump simultaneously.

At the heart of the 100520 is Champion's own 459cc single-cylinder, air-cooled OHV engine. Champion engines have earned a reputation for reliable starts and surprisingly long service intervals given the price bracket. The electric start system uses a rechargeable battery (included), and a recoil backup ensures you're never completely stuck if the battery dies. Cold-weather starts can occasionally require a couple of attempts, but the engine settles into a smooth, consistent idle quickly once running.

The dual-fuel feature is more than a marketing checkbox here. Propane burns cleaner, stores indefinitely without the fuel degradation issues gasoline faces after 30 days, and can be cheaper depending on your region. Switching between fuels is a straightforward process using the included propane hose and regulator: shut down the generator, connect your propane tank, flip the fuel selector, and restart. Champion rates propane output slightly lower than gasoline — a normal trade-off for the fuel type — but for most backup scenarios the difference is barely noticeable.

The outlet panel is genuinely well thought out for a generator at this price. You get a 50-amp RV-style outlet (TT-30R is not present; instead this is the 14-50R style), two 120V 20-amp duplex household outlets, a 120/240V 30-amp twist-lock, and a 120V 30-amp twist-lock — giving you the flexibility to run RV hookups, standard extension cords, and transfer switch connections all without adapters. Volt Guard surge protection is built in, which matters when you're running sensitive electronics or appliances with variable-speed motors.

Noise Level and Portability

At 74 dBA measured at 23 feet, the Champion 100520 is not a quiet generator — no open-frame unit at this wattage is. You'll want to position it at the edge of your property or use sound-dampening panels if neighbors are a concern. The frame features never-flat tires and a folding handle system, making it manageable for one or two people across flat terrain. At 196 lbs dry weight, though, you won't be picking this up alone. A wheel kit is included, which is a nice touch Champion doesn't always bundle with similarly priced units.

Who Is the Champion 100520 Best For?

This generator hits the sweet spot for suburban homeowners who want genuine whole-home circuit backup without stepping into the $3,000+ standby generator territory. It's equally at home on construction job sites where you need to run power tools, compressors, and lighting from a single source. RV owners with 50-amp shore power setups will appreciate the direct hookup capability. If you frequently camp in areas without hookups but still want appliance-level comfort, or if you run tailgate events or outdoor markets, the 100520's output headroom keeps you from ever feeling power-constrained.

What Can the Champion 100520 Power?

Understanding your wattage needs before buying a generator is critical. The Champion 100520's 7,000 running watts on gasoline gives you a generous budget to work with. Here's a realistic picture of what you can run simultaneously during a typical power outage scenario.

As you can see, a typical whole-home backup scenario leaves you with over 2,600 watts of running-watt headroom after accounting for peak startup draws. That headroom means you can add a dehumidifier, a second refrigerator in the garage, or a portable electric space heater without approaching your limit. The 8,750-watt starting capacity is what separates the 100520 from smaller 5,000–6,000-watt generators that can't handle a central AC startup surge.

Dual Fuel: Gasoline vs. Propane — Which Should You Use?

Champion's dual-fuel system is one of the most practical features on the 100520, but many buyers never actually use the propane option after the first test run. Understanding the genuine trade-offs helps you plan your fuel strategy before you actually need the generator in an emergency.

Gasoline delivers more power (8,750 peak watts) and is the easiest fuel to source during a non-hurricane emergency. The downsides are well-known: gasoline degrades within 30 days without a fuel stabilizer, gums up carburetors during storage, and can be difficult to find during widespread grid failures when gas stations also lose power. If you rely on gasoline, store treated fuel in sealed cans and rotate it every 90 days.

Propane addresses almost every gasoline storage problem. A standard 20-lb grill tank (~4.7 gallons propane equivalent) won't degrade sitting in your garage for 10 years. Propane also burns cleaner, meaning less carbon buildup on valves and spark plugs over the long run. The cost is slightly reduced output (7,875 starting / 6,300 running watts) — a trade-off most homeowners will never notice. The best approach for serious emergency preparedness is to keep at least two 100-lb propane tanks (available at most hardware stores) plus a gasoline supply for extended outages.

How the Champion 100520 Compares

To give you a clear picture of where the Champion 100520 sits in the market, here's how it stacks up against the most common alternatives buyers consider in the same wattage and price category.

The Westinghouse WGen7500DF edges out the Champion in run time and includes a CO sensor, making it a legitimate alternative if those features are priorities. The DuroMax XP9000iH offers a larger tank and higher peak wattage but costs meaningfully more and weighs an additional 28 pounds. The Generac GP8000E leads on raw wattage output but sacrifices dual-fuel capability and offers only a two-year warranty. For the combination of wattage, fuel flexibility, 50-amp RV support, and overall value, the Champion 100520 remains our top recommendation in this category.

How We Chose and Evaluated the Champion 100520

Our evaluation process for portable generators in this wattage class focuses on five core criteria, weighted to reflect how real homeowners and contractors actually use these machines.

Power Output Accuracy (25%): We verify manufacturer watt ratings against independent load testing data and user-reported real-world performance. Generators that routinely fail to meet rated output under controlled conditions are immediately disqualified, regardless of o