The deep freeze that caused sporadic power outages over much of the country in January 2014 sent homeowners scurrying to buy a generator to keep the heat going, turn on a couple of lights or salvage the food that was in their refrigerators.
Numerous bouts of bad weather mean that the sales of portable generators soared, manufacturers tell us. This kept prices stable for portable generators and permanent standby generators—those that are hard-wired into a home’s electrical system.
PORTABLE POWER. When it comes to portable generators, you’ll find that inverter generators, which have been around mainly for recreational purposes, are more widely available for home use now. Around the turn of the decade, Honda and Yamaha boosted wattage for a handful of models, which made them more attractive for residential use. Now at least five manufacturers make a total of 19 inverter models that can generate at least 1,000 watts of power, which is the amount of power that’s required for running lights and one or two small appliances. Prices have come down, too. Four years ago, you would have paid about $2,300 for an inverter portable generator that produced 3,000 watts of power, which can run, say, a refrigerator, a sump pump, a TV, and several lights and small electrical devices. You now can get that capability for about $1,900.
An inverter generator monitors the demand for a generator’s energy output and, as needed, increases or decreases the generator’s engine speed and, thus, how much power that it generates. Consequently, an inverter generator will run at higher speeds to operate high-wattage appliances and lower speeds for smaller devices. This capability makes inverter generators more fuel-efficient than are conventional generators, which run at full speed regardless of the demand. Our research shows that inverter portable generators weigh up to 40 percent less than do conventional models—some 1,000-watt models are as light as 29 pounds—which, of course, makes them even more portable.
Although inverter portable generators aren’t powerful enough for heavy-load demands, such as operating a central air conditioner, manufacturers tell us, it’s widely accepted that these models deliver uninterrupted utility-line-quality power. Power that’s produced by conventional portable generators can fluctuate and disrupt the operation of sensitive electronics, such as computers and TVs.
Know Your Power: Generator Running Requirements
However, despite the benefits of an inverter portable generator, we still believe that you’re better off with a conventional model. Manufacturers and dealers with whom we spoke agree that the only reason to buy an inverter portable generator for residential use is if you want to plug in sensitive electronic equipment during an outage. Inverter models aren’t as cost-effective as conventional models are: For example, for about the same price as an inverter portable generator that generates 3,000 watts, you can buy a conventional model that delivers 10,000 watts. That output is enough to run an air conditioner, a stove and a garage-door opener in addition to the appliances that the less powerful generator can handle. The better fuel efficiency of inverter portable generators doesn’t make up for the price difference.
Although inverter portable generators have become more powerful in the past 4 years, no manufacturer is willing to predict whether, or when, such models, which now top out at 6,500 watts, would rival the 12,000-watt power output of the most powerful conventional portable generator that we found.
Regarding conventional portable generators, manufacturers tell us that, over the next 2 years, built-in power management likely will trickle down to the premium end of the portable-generator category from permanent standby generators. Power management allows standby models that are connected to a home’s electrical panel via a transfer switch to turn off the flow of electricity to one appliance automatically to send electricity to another. You don’t have to turn off or unplug one appliance to use another, as is typically the case. Honda has an optional power-management upgrade for its portable generators. This feature will cost you $399–$499 on top of the generator’s price, which starts at $1,150.