How to Connect a Generator to Your House (The RIGHT Way)
Most people think they can just plug a generator into their house.
That’s dangerous — and illegal.
⚠️ The Biggest Mistake People Make
Never plug a generator into a wall outlet (called backfeeding).
This can:
- Electrocute utility workers
- Destroy your electrical system
- Start a fire
There are only THREE safe ways to connect a generator.
1. Extension Cords (Basic – Limited Use)
The simplest method is running extension cords directly from your generator to appliances.
- ✔ No installation required
- ✔ Works for fridges, lights, small appliances
- ❌ Cannot power your home circuits
- ❌ Messy and limited
👉 Best for short outages or temporary setups.
2. Generator Inlet Box + Interlock Kit (Best Value)
This is the most popular setup for homeowners.
- ✔ Powers your existing circuits
- ✔ Much cheaper than a transfer switch
- ✔ Safe when installed correctly
How it works:
- Generator plugs into an inlet box outside your home
- Power flows to your breaker panel
- An interlock kit prevents the main breaker and generator breaker from being on at the same time
🔥 This is the best balance of cost, safety, and flexibility for most homeowners.
👉 Find the right interlock kit for your panel →
3. Transfer Switch (Most Convenient)
A transfer switch lets you safely switch between utility power and generator power.
- ✔ Easiest to operate
- ✔ Clean and organized setup
- ❌ More expensive
- ❌ Limited number of circuits
👉 Best for users who want a simple, “flip-the-switch” solution.
🔌 What Size Generator Do You Need?
Before connecting anything, you need to make sure your generator can actually handle your home’s load.
- Furnace: ~600–1500 starting watts
- Refrigerator: ~1200–2000 starting watts
- Sump pump: ~1500–3000 starting watts
👉 Use the home load calculator →
⚠️ Safety Checklist Before You Start
- ✔ Generator must be outside (never indoors or garage)
- ✔ Turn OFF main breaker before generator power
- ✔ Use proper generator cords (not cheap extension cords)
- ✔ Never backfeed through an outlet
💡 Recommended Setup (Most Homeowners)
✔ Portable Generator (5,000–10,000 watts)
✔ Inlet Box (30A or 50A)
✔ Interlock Kit (matched to your panel)
✔ Heavy-duty generator cord
This setup gives you:
Whole-home flexibility without the cost of a standby generator.
Final Answer
The best way to connect a generator to your house is:
✔ Inlet box + interlock kit for most homeowners
✔ Transfer switch for convenience
✔ Extension cords only for basic use