100-Amp vs. 200-Amp Electrical Service: Which Does Your Home Need?

What Is the Difference Between 100 and 200 Amps?

The service rating describes how much electrical current a home's service equipment is designed to deliver. A 200-amp service generally provides more capacity for modern loads than a 100-amp service, but the right size depends on a load calculation rather than a label alone.

When 100 Amps May Be Limited

Older homes with 100-amp service may struggle when several large loads run together. Frequent trips, dimming lights, limited panel space, or plans for an EV charger, electric range, heat pump, pool, or addition are reasons to have the system evaluated.

Why 200 Amps Is Common

Many remodeled homes use 200-amp service because it offers more room for modern appliances and future circuits. An upgrade may include a new main panel, service conductors, meter equipment, grounding, utility coordination, permits, and inspection.

Do Not Upgrade Based on Amps Alone

A larger panel does not fix damaged branch wiring or poor circuit design. The electrician should assess the panel, service, grounding, branch circuits, and planned loads together. Load management may be an option for some homes, while others need a full service upgrade.

SM Electric performs service evaluations and panel upgrades in Tarzana, Encino, Woodland Hills, Sherman Oaks, and across LA County. Call (818) 300-2003 for a clear recommendation and free estimate.