If you're stuck comparing a Generac whole-house unit to a Briggs & Stratton, or wondering whether 22kW is overkill for a 2,400-square-foot home, you're asking the wrong first question.
Ask this instead: What does one hour without power actually cost you?
That number—not the wattage on the label—tells you whether you need a standby tied to your gas line, a dual-fuel inverter you can wheel out before a storm, or nothing at all. I've coordinated emergency power installs for dental clinics, restaurants, and a couple of home-based delivery operations. The people who regret their purchase are almost never the ones who bought too little. They're the ones who bought for a hypothetical outage instead of their own.
Here's the short version, and then I'll show you where it gets messy.
In March 2024, a dental clinic called us at 4:40 p.m. on a Friday. Their backup generator had failed its weekly test, and they had a full Saturday of root canals booked. Normal turnaround for a standby service call is 24 to 48 hours—or rather, closer to 72 when it's a weekend and the part isn't on a shelf.
We found a compatible transfer switch at a vendor two hours away, paid $400 extra in rush freight (on top of the $1,100 part cost), and had them running by 9 p.m. Saturday. A missed Saturday would've cost them about $8,000 in rescheduled procedures and roughly twice that in patient defection—dental patients don't forgive a cancellation two hours out.
That's the kind of math I run now before I recommend anything. Not "what size do you need" but "what happens if this fails on the worst possible day."
Here's the causation reversal that most shoppers miss: People think premium brands cost more because they're better. Actually, brands that build quality can charge more because their failure rates stay low enough to justify it. The causation runs the direction most people don't expect. A cheaper unit isn't necessarily a worse unit—but a brand with a 20-year track record of low failure rates has earned the right to price accordingly.
Which brings me to the Briggs & Stratton whole-house generator versus Generac question. Both are legitimate. Generac has a deeper dealer network in most metros; Briggs & Stratton tends to have a stronger foothold in smaller-portable applications and some regional service networks. The comparison that actually matters is who can get a qualified tech to your property within 48 hours—not who has more Facebook reviews.
Most people assume natural gas is automatically cheaper to run than propane. Sometimes it is—until you count the meter upgrade. A 22kW standby needs a gas line and meter that many homes don't have; the utility upgrade can run $1,200–$2,500 (as of January 2025 in our service area; verify locally, because utility pricing varies wildly by region).
A generator inverter dual fuel setup sidesteps that entirely. You run it on propane when the gas line isn't there, or gasoline as a backup to the backup. It's not a whole-house solution—it's a keep-the-fridge-and-the-router-on solution. Different job, different math.
And this is where I see a specific mistake repeat itself. The Generac 5550 wheelhouse generator is a portable workhorse—not a standby. I've watched it get sold to homeowners who thought "wheelhouse" meant whole-house. It doesn't. It's a job-site unit with a wheel kit. If a salesperson uses the word "wheelhouse" and "whole-house" in the same breath, ask them to point to the transfer switch. There isn't one.
The install timeline for a true standby is two to three weeks—well, closer to four once you add the permit and inspection window. If someone promises you a whole-house install in seven days, they're either skipping permits or they've already got the unit sitting in a warehouse.
A standby generator sits idle for roughly 360 days a year. That idle time is exactly why the battery tender—often marketed as a smart battery charger—is not a gimmick. It keeps the starting battery topped off so the unit actually fires when the power drops. Skip it and you'll learn the hard way that a $180 battery is cheaper than a 2 a.m. service call plus a missed half-day of business.
Some owners ask about DIY diagnostics. You can test a knock sensor with a multimeter—probe the signal wire against ground, check the resistance against the spec, and you'll know in about ten minutes whether the sensor is dead. On a unit still under warranty, though, poking the wrong connector can void the coverage. Learn the procedure, then decide whether the risk is worth saving a $120 diagnostic fee.
We didn't have a formal pre-installation checklist for our first year. It cost us when a tech showed up to a job where the gas meter couldn't support a 22kW load. We rescheduled, ate the $250 trip fee, and the homeowner went with a competitor who asked the right questions on the phone. Now every quote starts with a meter check—even if the customer has already signed. That one form has saved us more money than any ad campaign.
Two cases where the downtime framework falls apart. First, if you're in a region with rolling blackouts but no gas infrastructure, a dual-fuel inverter and a serious fuel storage plan matter more than any standby—you can't tie into a line that isn't there. Second, if you're renting, most standby installs need landlord and utility sign-off that can take months. In that case, buy the portable, keep the receipts, and revisit when the lease is up.
And if you're still not sure whether you need a generator at all—measure your actual outage history over the last three years. Most people discover they've lost power for a total of six hours, which changes the entire calculation. The best generator decision is sometimes the one you don't make.