What Should You Not Plug Into a Generator?
Not everything with a plug is safe to hook up to your generator. Some devices will trip it, damage it, or worse—damage themselves. Knowing what to avoid can save you from costly repairs and a really bad day. Here's the straight truth.
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Appliances That Can Damage Your Generator
High-wattage appliances that overload the system
Every generator has a rated wattage limit. Push past it and the generator shuts down—or worse, the overload causes damage to internal components that isn't always obvious straight away.
The big power consumers to watch out for include electric hot water systems, electric ovens, and ducted air conditioning. These can easily exceed what most portable generators can handle.
Check the running and starting wattage on any appliance before you connect it. Starting wattage is often two to three times higher than running wattage, which is where a lot of people get caught out.
Devices sensitive to power quality (dirty power)
Standard generators produce power that fluctuates slightly. This is called "dirty power" and while it's fine for most appliances, it can cause problems with anything that has sensitive electronics.
Modern electronics like laptops, smart TVs, gaming consoles, and variable-speed power tools are all vulnerable to power fluctuations.
If you're running these kinds of devices, you either need an inverter generator (which produces much cleaner power) or you should use a surge protector and UPS (uninterruptible power supply) between the generator and the device.
Medical equipment—use extreme caution
Some medical devices like CPAP machines and certain infusion pumps are highly sensitive to power quality. Connecting them to a standard generator without protection can damage the equipment.
If someone in your home relies on medical equipment, always check the manufacturer's specifications for power requirements. An inverter generator or a UPS is usually the safer route.
Things That Are Simply Unsafe to Connect to a Generator
Your home's fixed wiring (backfeeding)
This is the most important one. Plugging your generator into a wall socket—also known as backfeeding—is illegal and extremely dangerous. It sends electricity back through the grid and puts lives at risk.
Power workers restoring electricity to your street can be electrocuted when they encounter a backfed line they believe is dead. This is not a theoretical risk. It happens.
The only safe and legal way to connect a generator to your home's wiring is through a properly installed transfer switch, done by a licensed electrician. There are no exceptions to this rule.
Non-weatherproof extension cords
Always use heavy-duty, outdoor-rated extension cords with your generator. Indoor extension cords aren't designed for the power loads or outdoor conditions a generator creates.
Using the wrong cord can cause it to overheat, melt, or start a fire. Check the cord's amperage rating before use and make sure it matches what you're drawing from the generator.
Damaged or frayed cords and appliances
Never plug in anything with a damaged power cord. When you're running a generator, you're often working under stress conditions—a blackout, bad weather, or away from home—and it's easy to overlook things.
Inspect your cords and appliances before each use. A small nick in a cord can become a shock or fire risk when it's carrying load under generator power.
Common Mistakes People Make When Running a Generator
Plugging in too many things at once
It's tempting to run everything off the generator during a blackout. The problem is that adding appliances one by one without checking the total load adds up fast.
Add up the running wattage of everything you're planning to connect, then add the highest starting wattage to that total. That number needs to stay within your generator's rated capacity.
Using a power board without checking the rating
Power boards can be useful for connecting multiple devices, but only if they're rated for the load. Many household power boards have low amp ratings that aren't designed for generator use.
If you need to run several devices, either connect them directly to the generator or use a heavy-duty, generator-rated power board. Cheap ones from the discount bin aren't suitable.
Ignoring warning signs while the generator runs
If your generator starts to slow down, the lights dim and flicker, or you can hear it struggling, that's a sign it's being overloaded. Disconnect something immediately.
Running a generator in an overloaded state doesn't just risk tripping—it can damage the generator's alternator and coil windings, which are expensive to repair or replace.
What You Can Safely Run on a Generator
Most standard household appliances are perfectly fine to run on a generator, as long as you stay within the wattage limits. These typically include:
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Fridges and freezers (check starting wattage)
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Lights (LED in particular)
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Phone chargers and laptop chargers
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TVs (check the model for power draw)
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Small power tools with stable power draws
For sensitive electronics, an inverter generator gives you the cleanest output and the most protection for your devices. It's worth considering if you're regularly powering laptops or similar gear.
Conclusion: When in Doubt, Don't Plug It In
Generators are incredibly useful, but they work best when you respect their limits. Know your wattage budget, use the right cords, and don't push the boundaries.
And never, ever backfeed into your home's wiring. That one point alone has saved lives. Keep it in mind every time you set your generator up.
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