When a winter storm rolls off the Strait of Juan de Fuca and takes down power lines across Jefferson County, the difference between a comfortable weekend and a miserable one usually comes down to one decision made months earlier: what size standby generator you installed. Here on the Olympic Peninsula, extended outages are a fact of life, heavy rain, wind, and falling trees regularly interrupt service across Port Hadlock-Irondale, Port Townsend, Sequim, and the surrounding communities. At Double D Electrical, we've been installing and servicing backup power systems since 1998, and we're a Kohler Certified Residential Generator Dealer and Generac-experienced installer. The most common mistake we see homeowners make isn't buying the wrong brand, it's buying the wrong size. Undersize it, and your generator overloads during an outage. Oversize it, and you've overspent on capacity you'll never use. Here's how to get it right.
The right standby generator size depends on the total wattage of the appliances and systems you want to run during an outage, not just your home's square footage. Most homes in the Port Hadlock-Irondale area are well served by a 14kW to 26kW air-cooled standby generator, with larger rural properties sometimes needing liquid-cooled units above 30kW. A proper load calculation, done by a licensed electrician, is the only reliable way to size a unit correctly.
When to call a professional: Any time you're sizing a whole-home standby generator. Wattage math, transfer switch selection, fuel supply, and permitting all affect the final answer — and getting it wrong is expensive.
A standby generator is only useful if it can actually carry the electrical load your household demands the moment the power fails. Size is where most of the value, and most of the mistakes, live.
An undersized generator is a system that promises protection it can't deliver. Homeowners notice it the first time a well pump, furnace, and refrigerator all try to start at once, the generator bogs down, lights flicker, and in severe cases the unit shuts off on overload. This happens because motor-driven appliances draw two to three times their running wattage at startup. On the Olympic Peninsula, where many homes rely on electric well pumps and septic lift stations, that surge demand is easy to underestimate. The risks go beyond inconvenience: repeated overloading stresses the generator's alternator and engine, shortens its lifespan, and can leave you without water or heat during the exact storm you bought the unit to survive. An undersized generator often costs more over time because it wears out early and forces a second purchase.
Oversizing is the quieter, more expensive mistake. It's what it sounds like, buying far more capacity than your home will ever draw. Homeowners rarely notice a problem because the generator always has power to spare, but they've paid for kilowatts that sit idle. Beyond the higher purchase price, an oversized generator that runs mostly under light load can experience "wet stacking," where unburned fuel accumulates in the exhaust because the diesel or gas engine never reaches optimal operating temperature. This is more common with liquid-cooled units run well below capacity. In our Jefferson County service area, where propane and natural gas availability varies by property, an oversized unit also burns more fuel per hour, raising the cost of every outage. Right-sizing, not maximizing, is the goal.
A correctly sized generator runs in its efficiency sweet spot, typically between 50% and 80% of rated load. This is where fuel consumption per kilowatt is lowest and engine wear is minimal. During a multi-day outage, not uncommon after Peninsula windstorms, an efficient unit stretches your propane tank further and cycles less. Homeowners notice this as longer runtime between refuels and quieter operation. The reason is simple thermodynamics: engines are designed to run under moderate, steady load, not idle lightly or strain at their limit. Proper sizing directly controls how long your fuel lasts.
Most sizing errors trace back to a handful of predictable factors. Understanding them helps you have a smarter conversation with your electrician.
Square footage is a rough proxy at best, and treating it as gospel is the number-one sizing error we correct. Homeowners see charts that say "2,000 sq ft = X kilowatts" and assume the math is settled. In reality, two identically sized homes can have wildly different loads, one with gas heat and a modest kitchen, the other all-electric with a heat pump, hot tub, and EV charger. You'll notice the flaw only during an outage, when the "correctly sized" unit can't keep up. This happens because square footage says nothing about your actual appliances. On the Peninsula, all-electric homes and shops are common, which is exactly why we run a full load calculation instead of trusting a square-footage shortcut. Ignoring real load risks buying a generator that fails when you need it.
Many rural properties around Port Hadlock-Irondale, Chimacum, and Sequim run on private wells and septic lift stations, and these get forgotten in DIY sizing. A well pump is a large motor with a heavy startup surge, and losing it during an outage means no running water, no toilets, and no showers. Homeowners often discover the omission when the generator handles the house fine but stalls the instant the pump kicks on. It happens because people size for visible appliances and forget the equipment buried in the yard or utility room. In our service area, where municipal water isn't universal, we treat well and septic pumps as priority loads. Skipping them defeats the entire purpose of backup power for a rural home.
Startup surge is the invisible spike that wrecks undersized systems. Air conditioners, heat pumps, well pumps, and large refrigerators all draw a brief but intense inrush of current, often two to three times their running wattage, when their motors engage. Homeowners notice this as a hard dimming of the lights or the generator momentarily straining. It happens because electric motors require extra energy to overcome inertia at startup. A generator sized only for running watts will be caught flat-footed. In cold Peninsula winters, a heat pump and furnace fan cycling on together can create a compounded surge. Proper sizing accounts for the largest motor's starting load stacked on top of everything else already running, a calculation best left to a licensed electrician.
Sizing for today ignores tomorrow, and homes on the Peninsula are increasingly adding load. An EV charger, a new heat pump, a hot tub, a workshop, or an accessory dwelling unit can each add thousands of watts. Homeowners notice the shortfall a year or two after installation, when a new addition tips the system over its comfortable margin. It happens because generators are sized to a snapshot in time rather than a plan. Since Double D Electrical installs EV chargers and ductless mini-splits ourselves, we regularly ask clients about upcoming projects before finalizing a size. Building in reasonable headroom now is far cheaper than replacing an undersized unit later.
The cooling type sets a ceiling on capacity, and picking the wrong category limits your options. Air-cooled standby units are cost-effective and cover most homes up to about 26kW. Liquid-cooled units handle larger, sustained loads and long runtimes. Homeowners feel this constraint when a large or all-electric property maxes out what an air-cooled unit can practically deliver. It happens when sizing skips ahead to a model before the load calculation is done. Large rural estates, homes with multiple HVAC zones, or properties with heavy shop equipment often belong in liquid-cooled territory. As a Kohler-certified dealer, we match the cooling class to the load rather than forcing a home into whatever unit is on hand.
Fuel availability quietly shapes sizing. Natural gas, propane, and diesel each deliver different energy density and refueling logistics, and your fuel supply affects both the generator you choose and how long it runs. Homeowners notice this when a large unit drains a propane tank faster than expected during an extended outage. It happens because sizing is done in isolation from fuel planning. Across Jefferson and Clallam Counties, propane is common on rural properties without natural gas service, so tank capacity becomes part of the sizing conversation. A slightly right-sized generator paired with an adequate tank often outperforms an oversized unit that empties the tank in two days.
You can estimate your needs before we visit. Here's a safe, homeowner-friendly starting point.
Safety reminder: Never connect a generator to your home wiring with a suicide cord or improvised connection. A standby generator requires a properly installed automatic transfer switch and a permit. Backfeeding your panel can electrocute utility line workers restoring power in your neighborhood. Sizing math is safe to do yourself; the installation is not. The U.S. Department of Energy's guidance on backup and standby generators reinforces the need for professional transfer switch installation.
Home Profile
Typical Recommended Size
What It Generally Powers
Small home / essentials only
10–14kW
Well pump, refrigerator, furnace fan, select lighting and outlets
Average 2,000 sq ft home
18–22kW
Most of the home including a heat pump or AC
Large 3,000+ sq ft or all-electric
24–26kW
Whole-home coverage with electric heat and multiple large loads
Large rural / shop / multiple HVAC zones
26kW+ (often liquid-cooled)
Whole property including outbuildings and heavy equipment
These are starting points, not final answers. A 2,000 sq ft home with a 12kW peak load and one with a 20kW peak load call for very different units. That's why we run a load calculation on-site.
If you already own a standby unit that struggles during outages, here's how to decide.
Repair or keep your current generator when:
Replace or upsize when:
Chronic overloading is a capacity problem, not a repair problem, no amount of servicing makes an undersized generator big enough.
Standby generator projects vary widely based on size, fuel, transfer switch, and site work. The figures below are typical installed ranges for our region and should be treated as estimates, not quotes. Double D Electrical offers free estimates and financing.
Factors that affect your final price:
Double D Electrical handles standby generator projects end to end, from the first load calculation to final inspection.
Our technicians are background-checked and drug-tested, and as a Kohler Certified Residential Generator Dealer we're factory-trained on the systems we install.
Port Townsend: undersized unit replaced. A homeowner near Port Townsend had a small standby generator that repeatedly shut off whenever the well pump and refrigerator started together. Our load calculation showed the unit was several kilowatts short of the home's real surge demand. We upsized to a properly rated air-cooled Kohler system with a whole-home transfer switch. The result: uninterrupted water and refrigeration through the next winter windstorm.
Chimacum: rural property with well and shop. A property off Chimacum Road needed backup power for the house, a private well, a septic lift pump, and a detached workshop. Square-footage charts suggested a mid-size air-cooled unit, but our load math pointed to a larger, liquid-cooled system. After installation and a full load test, the entire property, including shop equipment, rode through a multi-day outage without a hiccup.
Sequim: all-electric home future-proofed. A Sequim homeowner with a heat pump was also planning to add an EV charger. Rather than sizing only for the present, we built in headroom so the future charger wouldn't overload the system. When the charger was installed the following year, no generator upgrade was needed.
A 2,000 sq ft home typically needs an 18–22kW standby generator for whole-home coverage, though the exact size depends on your appliances, not square footage. An all-electric home with a heat pump and well pump lands at the higher end, while a gas-heated home with fewer large loads may need less. A load calculation confirms the right size.
Add up the running watts of everything you want to power, then add the startup surge of your largest motor (usually the well pump or heat pump), and include a 20–25% safety margin. Divide the total by 1,000 to get the kW rating. For accuracy, have a licensed electrician like Double D Electrical run a full load calculation.
A 12kW (12,000-watt) generator can run a smaller or energy-efficient home, but usually not a large all-electric house with a heat pump, well pump, and multiple big appliances running at once. Whether 12kW is enough depends entirely on your combined running and starting loads. Many Peninsula homes need 18kW or more for full coverage.
A 3,000 sq ft house generally needs 24–26kW or more, especially if it's all-electric or has multiple HVAC zones. Larger rural properties with wells, septic pumps, and outbuildings sometimes require liquid-cooled units above 30kW. The real driver is total electrical load, so an on-site calculation is the reliable way to size it.
A standby generator is generally not a straightforward tax deduction for most homeowners, though there are exceptions for medically necessary equipment or certain business uses. Tax rules change and vary by situation, so consult a qualified tax professional. Double D Electrical can provide detailed invoices, but we don't offer tax advice.
With a properly installed standby generator and automatic transfer switch, you don't plug appliances in directly, the transfer switch powers your chosen circuits automatically. Avoid overloading the system with more demand than it's sized for, and never backfeed your panel with an improvised cord. The Ready.gov power outage guidance covers safe generator use.
Extended outages are relatively common in our region due to wind, rain, and falling trees, with the frequency varying by location and season. Rural properties tend to see longer restoration times. Your local utility, Jefferson County PUD, publishes outage information that can help you gauge how much backup runtime your home may need.
Sizing a standby generator correctly is the difference between reliable backup power and an expensive disappointment when the next storm hits. Double D Electrical has been serving Port Hadlock-Irondale, Port Townsend, Sequim, and communities across Jefferson, Kitsap, and Clallam Counties since 1998, and as a Kohler Certified Residential Generator Dealer, we'll run a real load calculation to match your home to the right system, no guesswork. We're licensed, bonded, insured, and offer free estimates with financing available. Call Double D Electrical at (360) 385-1130 or reach out online to schedule your on-site consultation. Downright Dependable, that's the promise behind every install.
At Double D Electrical, trust is earned through consistent results and a commitment to doing the job right. Serving , Washington for decades, we've built a reputation as a dependable partner for both homeowners and businesses. Our team takes pride in delivering safe, reliable services with attention to detail and a docus on long-term performance. We're not about flashy promises — we focus on proven solutions that keep your systems running when you need them most. From outage preparedness to complex electrical work, we go above and beyond to ensure every project meets the highest standards. Our involvement in local fire departments, youth programs, and community events reflects our dedication to the people we serve.
When you choose Double D Electrical, you're choosing a company that values quality, safety, and strong relationships. We treat every project with care because your trust matters to us.
If you're looking for dependable services in , Washington, Double D Electrical is ready to help. With over 28 years of experience, we provide trusted solutions for residential and commercial properties, ensuring your electrical systems and generations are built to perform when it matters most. Whether you're preparing for outages, upgrading your system, or handling a critical repair, our team has the expertise and equipment to get the job right.
We understand the importance of reliable power and safe electrical systems, which is why we focus on quality workmanship and long-term results. Our technicians are professional, experiences, and committed to delivering service you can trust every step of the way. From small repairs to large-scale projects, no job is too big with our heavy-duty capabilities.
Don't wait until an outage or issue disrupts your home or business. Call Double D Electrical today at (360) 385-1130 to schedule your service or get epert guidance. Get in touch now and experience the difference of working with a trusted local company serving , Washington.
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