The right generator size for your home depends on your total electrical load requirements, which we determine through a comprehensive on-site assessment that measures your actual panel capacity and usage patterns rather than relying on generic estimates.
Sizing a home generator isn't a one-size-fits-all calculation. Most residential properties fall into two categories: those seeking backup power for essential circuits only, and those wanting whole-house coverage. Essential-circuit systems typically range from 20-24kW and handle critical loads like your HVAC system, refrigerator, well pump (if applicable), water heater, and lighting. Whole-house generators, by contrast, usually require 36-48kW to simultaneously power multiple high-demand appliances without load shedding or automatic transfer switches limiting your usage.
The critical mistake homeowners make is purchasing based on generator brand specifications alone. A 22kW Generac unit might be perfect for your neighbor's home but undersized for yours—or conversely, a 48kW system might be overkill if you don't need simultaneous operation of multiple major appliances. This is why our assessment process starts with your electrical panel itself. We review your main breaker amperage, examine your existing circuit configuration, and identify which loads you prioritize during an outage.
During our on-site evaluation, we use load calculation tools to measure demand across your home's electrical systems. We document your HVAC tonnage and efficiency rating, your water heater type (gas or electric), your kitchen appliance specifications, and any specialty equipment like EV chargers or pool pumps. This data goes into our sizing formula, accounting for inrush current—the temporary spike when motors start up—which is often overlooked in quick estimates but critical for proper generator selection.
Budget considerations matter too. A 20kW system typically costs $4,000-$6,000 installed, while 36-48kW whole-house systems run $8,000-$15,000 depending on your location and fuel source (natural gas, propane, or diesel). There's also the difference between portable generators and permanently installed standby units. Portable units offer flexibility but require manual setup and fuel storage. Standby generators automatically activate during outages and connect directly to your home's fuel supply, providing seamless protection without intervention.
As a licensed contractor (MPL-38162) with 19 years in the plumbing and home systems industry, we've sized hundreds of generators for North Texas homes. We're an authorized Generac dealer, which means we have access to their complete product line and can match your home to the exact model that fits your needs. We don't guess on generator sizing—we measure, calculate, and specify.
One site visit covers everything: assessment, calculation, equipment selection, and a detailed recommendation. No follow-up calls, no surprises during installation.
Blackmon Plumbing provides professional generator sizing, installation, and maintenance services for homeowners throughout the Dallas-Fort Worth area, backed by our Generac dealer authorization and decades of experience in residential electrical systems.