Portable vs Standby Generator: Which Size Do You Need?

Portable vs Standby: The Key Difference

The fundamental difference is not just size — it's how the generator connects to your home. A portable generator sits outside, requires manual setup during an outage, and connects via extension cords or a manual transfer switch. A standby generator is permanently installed, connected to your home's electrical panel, and turns on automatically within seconds of a power outage.

Portable generators are typically 3,500-7,500W and cost $400-1,500. Standby generators start at 7,500W (rare) and go up to 22,000W+, costing $2,000-6,000 plus installation ($1,000-2,500). The standby generator's value is convenience and automation — you don't have to go outside in a storm to start it.

For sizing: a portable generator powers select circuits (fridge, furnace, lights, well pump). A standby generator powers your entire home including central AC, electric stove, and dryer.

Top picks for this size

Which Generator Type Is Right for You?

• Choose portable (3,500-7,500W, $400-1,200) if: outages are rare (1-2 per year), budget is under $1,500, you have a manual transfer switch or extension cords, you want a generator you can take camping or to job sites
• Choose standby (14,000-22,000W, $3,000-6,000) if: outages are frequent or long (3+ days), you have medical equipment that can't lose power, you want automatic reassurance, you have a propane or natural gas line
• Consider a hybrid approach: a portable 3,500W now for essential circuits, upgrade to standby later if needed

Frequently asked questions