Generator Accessories Guide (2026): What You Actually Need, and What to Skip

Most generator accessories lists are shopping lists. This one is ranked by what actually prevents a bad outcome: carbon monoxide poisoning first, overloaded cords and backfeeding second, a generator that won’t start after sitting all year third. Covers, wheel kits and fancy fuel cans are nice. A plug-in CO alarm and a properly rated cord are not optional. Here’s the order to buy in, and the things to leave in the cart.

Quick honesty: I don’t keep a generator in a shed and I haven’t tested any of this gear. I’ve read the manuals, the safety guidance and a lot of post-storm owner accounts, and ranked things by how badly it goes if you get them wrong. When you’ve lived with unreliable power, you learn the outage itself is rarely the dangerous part. It’s what people improvise during it.

Generator accessories ranked by priority

1. A carbon monoxide alarm (buy this first)

Portable generator exhaust contains carbon monoxide, and it can build up indoors even when the generator is outside if it’s too close to a window, door or vent. The CDC’s guidance is to never run a generator inside a home, garage or basement, and to keep it at least 20 feet from windows, doors and vents. A CO alarm is the backstop when that distance isn’t enough because the wind shifts.

During an outage, a hardwired alarm with no battery is useless, so battery backup matters. The First Alert CO605 plugs into a standard outlet, uses an electrochemical sensor, sounds an 85-decibel alarm and falls back to a 9V battery when the power goes out. First Alert lists a 7-year limited warranty. Put one on each sleeping level and one near the room closest to where the generator runs. Our portable generator carbon monoxide safety guide covers placement, alarm choice and auto-shutoff standards in full.

2. A generator cord that matches the outlet

The cheapest mistake is running a big generator through a light household extension cord. A 16-gauge cord rated for 13A will get hot carrying a space heater and a fridge, and the voltage drop over a long run makes motors work harder. Match the cord to the outlet you’re using: 12-gauge for a 20A household outlet over a typical run, 10-gauge for a 30A twist-lock. Look for an outdoor jacket rating such as SJTW or SJOOW.

If your generator has a 30A L14-30 outlet, a splitter cord is the tidiest way to use that capacity without a transfer switch. Champion’s 25-foot fan-style cord takes an L14-30P plug at the generator and splits into four 20A household outlets, so you can run a fridge, freezer and a few lamps from the generator’s biggest outlet with one cord out the door.

For sizing cords to specific loads, our cable gauge guide explains the relationship between current, length and wire size. For specific picks by outlet type, see our generator extension cord guide.

3. A transfer switch or interlock, if you want house circuits

If you want the furnace blower, well pump or hardwired lights on generator power, you need transfer equipment: a manual transfer switch, a panel interlock kit, or an automatic transfer switch for standby units. This is the single biggest decision among generator accessories, because it involves your main panel and usually an electrician. Our full generator transfer switch guide compares the three types, covers 30A versus 50A sizing and explains the inlet box and cord you’ll need.

4. Maintenance: the generator accessories that keep it starting

A generator that sits for eleven months and then has to start in a storm is the normal case, not the exception. Gasoline goes stale, and ethanol blends attract moisture, which gums up small carburetors. Three habits cover most of it: add fuel stabilizer to any fuel that will sit, run the generator under load for a short period regularly, and change the oil on the schedule in your manual (new engines usually call for an early first change). Keep a spare spark plug, the correct oil and an air filter on hand. Model-specific maintenance kits bundle these, but check the part numbers against your manual rather than trusting “universal fit.”

5. A parallel kit, if you run two inverter generators

Two small inverter generators linked with a parallel kit can match a bigger unit’s output while staying easier to carry, and you can run just one when the load is light. The catch is compatibility: most kits only work between specific models from the same brand, and the kit’s own cable often limits total output. Our best generator parallel kits roundup covers which ones pair with what.

6. Covers and wheel kits

Most portable generators aren’t designed to run in rain, and a wet generator is a shock hazard. A running cover or tent designed for your generator’s size lets you run it in bad weather while keeping airflow clear. A storage cover is a different product — never run the generator under it. Wheel kits are worth it on heavier open-frame units; many already include wheels, so check before buying.

What to skip

Double-male “backfeed” cords. They energize your wiring through an outlet, can send power onto utility lines, and leave live exposed prongs on the other end. Use transfer equipment instead. Adapters that claim to make 240V from a 120V generator — they don’t create a second leg of power. Light-duty indoor extension cords, for the reasons above. And running a generator in a garage with the door open is not an accessory problem but it’s the most common fatal mistake, so it belongs on this list.

Generator or battery backup?

If most of this list feels like a lot of maintenance and risk for occasional outages, a battery power station avoids fuel, exhaust and cords through windows entirely, at the cost of limited runtime. Our generator vs power station comparison lays out where each wins, and the home backup power guide covers whole-home options. For hurricane regions specifically, the hurricane power prep checklist is the companion to this page.

For official carbon monoxide safety guidance, see the Centers for Disease Control and Prevention (CDC); for electrical and fire safety, the NFPA.

Frequently asked questions

Also in this cluster: our best portable generator cover guide and the generator wheel kit guide.

Last updated: September 23, 2026. This generator accessories guide uses manufacturer listings and CDC and NFPA safety guidance. We do not display live prices.