What should I look for when buying a generator?

The five most important factors: (1) Wattage — size for your actual load needs with 20% headroom. (2) Reliability — Honda and Yamaha have the best long-term reliability; Generac leads for standby. (3) Start type — electric start is worth the extra cost for home backup. (4) Fuel type — dual fuel adds emergency flexibility; propane stores longer. (5) Noise — inverter generators (48–60 dBA) vs. conventional (65–75 dBA) matters significantly for residential use.

What generator brand is most reliable?

For portable generators: Honda is the gold standard for long-term reliability, typically lasting 1,800–2,500 engine hours vs. 300–800 for budget brands. Yamaha is a close second. Generac, Champion, and Westinghouse offer good value with moderate long-term reliability. For standby generators: Kohler and Generac lead the market, with Kohler having a slight edge in long-term reliability metrics.

Is it worth buying a name-brand generator?

For infrequent use (1–5 times per year), a budget generator ($400–$800) is defensible — it may last only 5 years but the total cost is similar to a premium unit at 20+ years. For regular use (monthly exercise runs + outage use), or any critical application, the Honda/Yamaha/Kohler premium pays for itself through reliability and longevity. A Honda EU2200i at $1,100 costs less per year of use over 15 years than replacing a $500 budget inverter every 4 years.

What's the difference between running watts and surge watts on a generator?

Running (rated) watts is the continuous power a generator can sustain. Surge (starting) watts is the brief peak it can handle for 2–3 seconds during motor startups. For example, a generator labeled '5,500W / 6,875W surge' runs at 5,500 watts continuously but handles a 6,875-watt startup spike. Always size for running watts first, then verify the surge exceeds your largest motor load.

Do I need a transfer switch for a portable generator?

Yes — for any permanent connection to your home's wiring, a transfer switch (or interlock kit) is required by code and critical for safety. Backfeeding utility lines without a transfer switch is illegal and dangerous to utility workers. You can use heavy-duty extension cords directly to appliances without a transfer switch, but connecting to your home's circuits requires a proper transfer switch installation.

What is the best time of year to buy a generator?

The best time to buy a generator is late winter to early spring — before storm season and before summer heat drives AC-related demand. Late fall (post-hurricane season, September–November) also sees good deals as retailers clear inventory. Avoid buying just before or after a major storm hits your area — price gouging is common and inventory sells out quickly.

Generator Buying Guide 2025 — How to Choose the Right Generator | Generator Size Calculator

6-Step Generator Selection Framework

Calculate your wattage needs

Use our generator size calculator to find your running watts and surge watts. This determines the minimum generator size you need.

Choose your use case

Portable for occasional home backup or camping; standby for automatic whole-home coverage. Inverter for sensitive electronics; conventional for high-wattage loads.

Select fuel type

Gasoline for maximum availability; propane for long-term storage; dual-fuel for emergency flexibility; natural gas for standby (no refueling).

Compare reliability and warranty

For critical applications, choose Honda/Yamaha (portable) or Generac/Kohler (standby). Check warranty length — 2–5 years is standard for quality brands.

Plan your transfer switch

Budget for a transfer switch ($300–$2,500 installed) if connecting to your home's electrical system. Get an electrician quote alongside your generator purchase.

Compare prices and buy

Compare MSRP vs. authorized dealer vs. big box store. Authorized dealers often include setup and support. Avoid gray market units without US warranty coverage.

Portable vs. Standby: Complete Comparison

Factor	Portable Generator	Standby Generator
Best use case	Occasional outages, camping, job sites	Frequent outages, medical needs, whole home
Startup	Manual (pull or push button)	Automatic (within 10–30 seconds)
Fuel	Gasoline, propane, or dual-fuel	Natural gas or propane (permanent supply)
Wattage range	1,000–12,500W typical	7,500–25,000+ watts
Installation	None required (add transfer switch opt.)	Professional installation required
Unit cost	$400–$2,500	$3,500–$9,000+
Installed total cost	$400–$3,500 (with transfer switch)	$6,000–$15,000+
Annual operating	$100–$500	$500–$1,200
Lifespan	5–20 years (brand dependent)	20–30 years

* Standby installed cost includes automatic transfer switch, electrical work, gas line, and permit fees.

Brand Reliability Guide

Honda — The Gold Standard

Honda's GX and EU series engines are the most reliable portable generator platforms available. Honda generators typically log 1,800–2,500 hours before major service, vs. 300–600 hours for budget brands. Honda's inverter generators are used by professional photographers, event companies, and RVers who can't afford failures. The premium is worth every cent for anyone who will use the generator regularly.

Yamaha — Honda's Closest Rival

Yamaha's EF series inverter generators match Honda almost point-for-point in reliability. Yamaha's slightly larger fuel tanks give better runtime at comparable noise levels. Parts are slightly harder to find than Honda, but authorized dealers are widely available. An excellent choice, especially where Honda pricing is out of reach.

Generac — Best Value and Availability

Generac dominates both the portable and standby markets. Their portable generators (GP series) are reliable mid-tier options with excellent value — not Honda-level durability, but solid for 5–10 years of regular home use. Generac's standby generators (Guardian series) are the best overall choice for most homeowners due to widespread dealer availability, the largest ecosystem of accessories, and competitive pricing.

Champion — Best Budget with Warranty

Champion offers the best warranty in the budget generator category — 3 years on most portable models vs. 1–2 years for competitors. Their dual-fuel models are particularly popular because they add propane capability at minimal extra cost. Long-term reliability is average, but the warranty coverage partially offsets this risk.

Kohler — Premium Standby Choice

For standby generators specifically, Kohler's RESAL series offers quieter operation, 200-hour oil change intervals (vs. 100 hours for Generac), and 5-year warranty coverage. The premium is approximately 10–20% over equivalent Generac models. For homeowners who prioritize longevity and minimal maintenance, Kohler is the right choice.

Where to Buy a Generator

Authorized dealer: Best for standby generators — includes professional installation, setup, and first-year maintenance. Important for warranty coverage in many brands.
Home Depot / Lowe's: Good for portable generators. Wide selection, competitive pricing, convenient returns. Limited standby selection.
Costco: Excellent seasonal deals on portable generators, especially in summer and pre-storm season. Limited selection but very competitive pricing.
Amazon: Good for research and price comparison; be cautious of third-party sellers for warranty purposes. Only buy from authorized resellers to maintain warranty coverage.

What to avoid: Generators from unknown brands on Amazon or AliExpress. These often don't meet EPA/CARB emissions standards, have no US warranty support, and may not perform to their stated wattage ratings.

Generator Checklist Before You Buy

✓ Calculated exact running and surge wattage needs with our generator size calculator
✓ Chosen portable or standby based on outage frequency and budget
✓ Selected fuel type (gasoline, propane, dual-fuel, natural gas)
✓ Verified electric start availability if needed
✓ Budgeted for transfer switch installation ($300–$3,000)
✓ Compared warranty terms (2-year minimum; prefer 3–5 years)
✓ Confirmed EPA/CARB compliance for your state
✓ Planned safe storage location with 20ft clearance from building

Frequently Asked Questions

How to Choose the Right Generator