100 Amp vs 200 Amp Service: The Complete Homeowner's Guide

If your home was built before 1990, chances are you have a 100 Amp electrical panel. For decades, this was plenty. But in the age of electric vehicles and induction stoves, that math has changed.

What Does "Amps" Actually Mean for Your Home?

Think of your electrical service like a water pipe entering your house.Volts (Pressure) push the electricity, but Amps (Volume) determine how much water can flow at once.

A 100 Amp panel is a smaller pipe. If you turn on the shower (AC), the dishwasher, and the garden hose (EV Charger) all at once, the pipe runs out of water capacity. In electrical terms, your main breaker trips to prevent the wires from melting.

The Math: Why 100 Amps Isn't Enough Anymore

Let's look at the typical power draw of modern "electrified" appliances compared to standard ones:

Signs You Need to Upgrade to 200 Amps

• Breakers trip frequently when using the microwave or hairdryer.
• Lights flicker when the AC compressor kicks on.
• Your panel feels warm to the touch (This is a fire hazard; call a pro immediately).
• You are installing a Level 2 EV Charger.
• You are renovating a kitchen with new electric appliances.

Cost of Upgrading: Is it Worth It?

Upgrading from 100A to 200A typically costs between $2,000 and $4,500. This includes:

• New Meter Box and Service Entrance Cable
• New Breaker Panel with more slots
• Grounding system update (Water pipe + Ground rods)
• Labor and Permits

While expensive, it adds immediate value to your home. "EV Ready" is a major selling point in today's real estate market.

Before You Call an Electrician

Don't guess. Use our calculator to see exactly how much power your specific home configuration uses. You might be able to get away with your current panel if you don't have heavy electric heating.