To test generators for performance, our expert engineers load each model with various essentials you might want to power during an outage, like a space heater, refrigerator, or window air conditioner. We make sure the generator can handle the load it promises and also determine what happens when a sudden spike in voltage hits, like what would happen if the compressor in your refrigerator kicked on when the generator was already close to capacity. The best models take that in stride, while others bog down or even quit.
We also consider how easy it is to move and use a generator, how efficiently it uses gasoline or other fuel, and how long it runs on a single tank.
We run each generator through a variety of scenarios designed to capture the ways in which a consumer might inadvertently misuse a generator to test for safety. We conduct these tests in a custom-built facility on the grounds of our Yonkers, N.Y., test facility. Our test chamber is wired with calibrated carbon monoxide sensors, and we record CO levels throughout the container when a generator is on, noting how quickly each generator turns off when the levels become potentially dangerous.
Finally, to reduce the risk of carbon monoxide poisoning, many portable generators feature a built-in sensor that triggers an automatic shutoff if CO builds up to dangerous levels in an enclosed space. Some also have engines that emit less CO in the first place.
Recent test data from CR shows that this safety feature is likely to save lives, and we’ll only recommend portable generators that pass our expanded CO safety technology test.
Choosing the right home generator means figuring out what size generator you need first. Generators are sold by power output, measured in watts. The amount of power a generator delivers determines how many electronics and appliances you can run at once; figure on about 5,000 watts for a typical home. The delivery and quality of power determine how well a model will power your home. A generator with a high output that struggles with power delivery or quality might stall or trip a circuit when it’s bogged down.
Before you look through our generator ratings for the best generator for your home, make a list of the devices you’ll need when the power’s out. Then add up wattages to get you in the right ballpark.
Here are some rough wattage estimates for common essentials as you build out your list:
Don’t let rain, snow, or wind keep you in the dark. Look for these options to get a generator that’s safe, reliable, and tailored to your power needs.
Automatic CO Shutoff
This critical safety feature automatically shuts down a generator’s engine if a built-in CO sensor detects that the deadly gas has reached certain levels. We have over a dozen generators in our ratings with a CO safety shutoff. (CR only recommends portable generators with this feature.)
From Generac to Honda, more brands than ever offer options with this technology—you might see them advertised with marketing terms like “CO Guard” or “CO Protect.” But the only way to verify whether a generator meets one of the two standards is to look for one of these certifications on the packaging:
• ANSI/UL Certified for Carbon Monoxide Safety
• ANSI/PGMA G300 Certified Safety & Performance
Low-CO Engine
Brands including Ryobi and Echo are using a low-CO engine to guard against carbon monoxide poisoning.
Automatic Start
When the power goes off, the generator automatically starts—without you lifting a finger. This is great if you travel a lot or work far from home, and can’t always get there quickly in an emergency.
Electric Start
Several portable models offer electric start, a push-button alternative to the hassle of pull-starting the engine. If the battery is not included, make sure you factor in the added cost (around $50). Stationary models have automatic starting.
Alternative Fuel Capacity
Most portable models run only on gasoline, though some come equipped to run on a propane tank or natural-gas line and others can be converted with kits.
Fuel Gauge
You may appreciate glancing at a fuel gauge to determine what fuel is left in your portable generator, especially during blackouts.
Low-Oil Shutoff
If oil falls below minimum levels, the generator shuts down to prevent engine damage. While this feature is standard for stationary generators, it’s increasingly common on portables.
Multiple Outlets
Four or more outlets on a portable generator let you best use the wattage by spreading the load, though we recommend using these for only a few devices at home, or for when you’re away—at, say, a campsite. See the next section on transfer switches.
If you want to learn more, please visit our website Huipu Power.
Removable Console
A removable console connects to the generator so that you can plug in appliances without running (potentially risky) extension cords outdoors.
Buying used generators can save you money but they don't come without their risks. I recently purchased a used Predator and wanted to share what I did after I got it home.
The first thing I did was ordered a new battery. The one that was in it was dead. You can find the same one I purchased on Amazon HERE. It has push button meter to see current volts and battery level! Pretty awesome!
#ad
Next I gave it an initial dust off. Looks like this one spent some fun time at the Dunes #Glamis! I just used my air compressor to get the surface dust off.
After I dusted off all the fun, I got to work with the heart of the tune up. I noticed it was slightly surging at idle so I knew a full tune up would do it some good.
To start I emptied the gas tank. There is a clear line at the bottom of the carburetor that goes to the bottom of the generator. Take this line and put it in an old gas can (You may have to play around with the height of both to get it to work). After the line is secured in the gas can there is a flat head screw where the line goes into the carb. Undo the screw a few turns. Turn the master knob to "run" which allows the gas to flow. It is a slow trickle so budget some time depending on how full your gas tank is.
While the fuel was draining I was able to change the oil an install the Magnetic Oil Dipstick which you can find on our site HERE. I used a good Oil Stabilizer like the one below, and a good Full Synthetic oil. I also lost the Charcoal Canister somewhere so I was unable to put it back on...oops!
#ad
I was unsure on how long the gas was in there and didn't know if a stabilizer like StaBil was used so I took the carb apart and cleaned it as thoroughly as I could. Here is a good video showing how to do it from the Small Engine Guys. The air filter had a slight gas smell to it so I cleaned it in the sink with some dawn and let dry.
After this I worked on the exhaust and the dreaded spark arrestor. I believe they are the equivalent to the modern day facemask. Designed to keep something bad that may or may not happen from getting out and causing huge damage. I don't care what side of the fence you are on with that issue it is so true! I cleaned the mesh cone and the circle part fell right onto my snips cutting it in half like an Oreo...oops!
After the fuel was drained it took all of an hour giving it a proper tune up. When it was back together it was running perfectly, no surging at idle or anything, seemed brand new! Only thing left to do was install our Plug & Play Remote Start & Stop Kit and soon I'll give it a lift with our long awaited Wheel Kit.
Oh and I slapped one of our stickers on it to make it official!
At the end of the day you can get some value out of buying a used generator. Ask some basic questions of the seller but know you may not get the truest of answers. I was lucky and I knew the seller so I knew I could trust at least 80% of what he told me (HaHa! Just kidding MJ).
Some questions you should ask:
These will give you a good idea of the level of maintenance done to this point.
Please share anything else you have done to tune up a used generator so we can all Generate Better!
P.S. I forgot to empty the oil into a water bottle and it fell off of my stand....That was a fun clean up...
The company is the world’s best GOOGOL Generator supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.