Generator comparison
Portable vs Standby Generator: Which is Right for Your Home?
By the WhatSize editorial team 5 min read Standards-reviewed
The biggest generator decision isn't just about wattage — it's about the type. Portable generators are affordable and flexible. Standby generators are permanent, automatic, and powerful. This guide helps you decide which one fits your home, budget, and outage tolerance.
Portable vs Standby: Side-by-Side
| Factor | Portable | Standby |
|---|---|---|
| Cost (including install) | $500 - $2,000 | $5,000 - $15,000 |
| Power output | 1,000 - 10,000W | 7,000 - 40,000+W |
| Auto start | No (manual) | Yes (10-30s delay) |
| Fuel type | Gas/propane | NG or LP (hardwired) |
| Installation | Plug-in | Permanent + transfer switch |
| Runtime | 8-12 hrs/tank | Unlimited (NG line) |
| Home value | Minimal impact | Adds resale value |
When to choose Portable
- You have a budget under $2,000
- You only need to power essential circuits (fridge, sump pump, furnace)
- You can manually connect and start the generator during an outage
- You don't mind refueling every 8-12 hours
- You want the flexibility to use the generator for camping or job sites too
When to choose Standby
- You need automatic backup — power comes on within 30 seconds without you doing anything
- You have medical equipment that requires uninterrupted power
- You want to power your entire home including central AC
- You live in an area with frequent or extended outages (hurricane zones)
- You can afford the $5,000-15,000 installed cost
Top pick for each option
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Best for Portable
Best for Standby
Frequently asked questions
How much does a standby generator cost installed?
A 14-22kW standby generator typically costs $4,000-7,000 for the unit plus $3,000-8,000 for installation (concrete pad, gas line, transfer switch, electrical work). Total: $7,000-15,000 depending on size and local labor rates.
Can I install a standby generator myself?
No. Standby generators require licensed electricians and plumbers for the transfer switch and gas line connection. Improper installation can backfeed the grid, creating a deadly hazard for utility workers.
How long do portable generators last?
A well-maintained portable generator lasts 1,000-2,000 hours of runtime. For a typical homeowner using it for 2-3 outages per year (about 50 hours/year), that's 20-40 years. Standby generators last 3,000+ hours because they self-test weekly.
More generator sizing guides
- What Size Generator for a 2,000 Sq Ft House?
- What Size Generator to Run a Sump Pump?
- What Size Generator to Run a Window AC Unit?
- What Size Generator for an RV? A Complete Guide
- What Size Generator to Run a Refrigerator?
- Portable vs Standby Generator: Which Size Do You Need?
- What Size Propane Tank for a House Generator?
- What Size Generator for a 200 Amp Service?
- Generator Propane Consumption Calculator + Runtime Chart
- What Size Generator for EV Charging? Level 1 + Level 2 Guide
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