I've been maintaining my family's backup power setup for about 7 years now. In that time, I personally made two significant mistakes that cost me a total of around $2,800 in wasted equipment and rework. The first one was a gas generator I bought in 2018 that couldn't even run my refrigerator and lights at the same time. The second was a "large inverter generator" I ordered in 2022 that was so loud my neighbor filed a noise complaint. Now I keep a checklist for anyone who asks me about portable emergency generators for the home. Below are the questions I get most often — and the answers I wish I'd had.
I assumed bigger was better and bought a 12,500W gas generator. Turned out I was way overpaying for power I'd never use — and the thing was a beast to move. Here's the reality: for a typical home, you need to add up the starting watts of essentials: refrigerator (800W running, 2,400W start), a few lights (300W), a sump pump (1,000W start), and maybe a well pump (1,500W start). That's usually around 3,000–4,500 running watts. I'd argue that for most households, a 5,000W portable generator is the sweet spot. But don't take my word for it — actually calculate your own loads. I learned never to assume after my first generator failed to start the fridge compressor.
Short answer: no. I once considered putting my generator in the garage during a storm because I was tired of going outside in the rain. That would have been a fatal mistake. Even with the garage door open, carbon monoxide can build up and kill you in minutes. I'm not an expert on exhaust dynamics, but I do know that the only safe place for a portable emergency generator is outdoors, at least 20 feet from doors and windows, with the exhaust pointing away. Indoor generators for home use are a myth — unless you're talking about a permanently installed standby unit that's properly vented. Don't learn this one the hard way.
I've used both. Gasoline is easy to find and portable, but it goes bad after a few months. Natural gas generators run on your home's gas line, so you never have to worry about refueling — great for extended outages. The catch: natural gas models cost more upfront, and they produce slightly less power than the same engine running on gasoline (about 10-15% less). Also, if you lose gas pressure during an earthquake or infrastructure failure, you're stuck. Personally, I prefer a dual-fuel generator that can switch between gas and propane. That way I have options. In my opinion, the flexibility is worth the extra $200-300.
This is a question I wish I'd asked before buying my second generator. Conventional generators produce "dirty" power — voltage fluctuates, which can fry sensitive electronics like laptops, LED TVs, and modern fridge control boards. Inverter generators produce clean sine-wave power that's safe for electronics. The trade-off: inverter generators are more expensive (maybe 30-50% more) and typically have lower maximum output. But if you plan to run anything with a circuit board (and who doesn't?), a large inverter generator is worth it. I made the mistake of plugging my router into a conventional generator and lost the network adapter — $80 replacement plus the frustration of not having internet during a blackout. Don't be me.
It depends on what "power a house" means to you. A small generator (2,000W) can run a refrigerator, a few lights, maybe a fan, and charge phones. That's it. No AC, no well pump, no microwave. For many people, that's actually enough — especially if you're using it for a camping trip or just keeping food cold during a short outage. I've got a little 2,200W inverter generator that I take camping, and it runs my CPAP machine and a small electric cooler just fine. But if you're expecting to keep the whole house running like normal, you need something bigger. Roughly speaking, you need at least 5,000W to cover the basics plus a window AC or a small water heater.
I cringe when I see people using extension cords through a window or under a door. That's a tripping hazard and a fire risk. For a permanent setup, install a manual transfer switch and a generator inlet box. That way you can safely power hardwired circuits like your furnace, well pump, and sump pump. The cost is about $400-800 for the switch + installation, but it's worth every penny. I didn't do this the first time — I ran a heavy-duty extension cord through the dog door. It worked, but it was sketchy. After the third time I nearly tripped over it, I finally called an electrician. The peace of mind is real.
Oh, plenty. The most frustrating part of generator ownership: you forget about it until you need it, and then it won't start. After the second time my generator failed to start because stale gas clogged the carburetor, I created a maintenance checklist. Here's what I do now:
This worked for me, but my situation is a suburban home with predictable outage patterns. If you live in a hurricane zone or use your generator weekly, your maintenance schedule will differ. Your mileage may vary.
Noise. I bought a conventional open-frame generator once without checking the decibel rating. It was 75 dB at 23 feet — basically a lawnmower running non-stop. My neighbor called the township. I ended up selling it at a loss and buying an inverter generator that runs at 58 dB (as quiet as a conversation). For residential use, aim for under 65 dB. Trust me on this — I learned the hard way. Also, think about storage: where will you keep a 100-pound generator when it's not in use? A garden shed or garage corner works, but make sure it's dry and ventilated. These are the little things that save you thousands in the long run.
I'm not a professional electrician or a generator engineer — I'm just a homeowner who made expensive mistakes so you don't have to. If you're shopping for a portable emergency generator today, start with a realistic power audit, decide on fuel type, and budget for a transfer switch. You'll thank yourself the next time the lights go out.