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- Wasilla, AK · Serving the Greater Mat-Su Valley
Generators & Backup Power
Free instant sizing for Mat-Su Valley homes, from Alaska’s authorized Cummins dealer.
Picking the right size home generator is the difference between keeping your house running through an outage and being left in the cold. Size it too small and it can’t carry your furnace, well pump, and refrigerator at the same time. Size it too big and you’ve overspent on a unit that burns more fuel than it needs to. Our free generator sizing calculator does the math for you in about a minute: tell it how big your home is and which appliances you want to keep powered, and it recommends the right Cummins standby generator for your needs. When you’re done, request a free in-home assessment and one of our licensed electricians will confirm the exact size for your home here in the Mat-Su Valley.
Free tool
The calculator uses the same method a professional electrician uses to size a standby generator. It adds up the running watts of every appliance you choose, then adds the extra starting watts that motors, like your well pump, furnace blower, or air conditioner, draw for a few seconds when they switch on. That combined number is your home’s true power demand. The tool then matches it to the smallest Cummins generator that can carry the load with room to spare. It takes three quick steps:
If you have ever added up the wattage on your appliance labels and wondered why the number a dealer quotes you is higher, this is why. Every appliance has a running wattage, the power it draws once it is up and going, and anything with a motor also has a starting wattage, a brief spike as the motor overcomes inertia. A well pump can pull several times its running draw for a second or two at startup.
Sizing on running watts alone is the single most common mistake we see, and it is the one that leaves people with a generator that stumbles and shuts down the first cold morning the furnace and the well pump happen to kick on together. The calculator handles this the way we do in the field: it totals every running watt, then adds the surge of your single largest motor on top, because that is the worst case your generator has to swallow. Additional units of the same appliance count at half load, since they rarely all start at once.
A backup generator is only worth having if it can actually run what you need when the power goes out. In Alaska, that usually means your heat source, well pump, and refrigerator or freezer are non-negotiable. Losing them in winter isn’t just an inconvenience, it can mean frozen pipes and spoiled food.
An undersized generator will overload and shut down at the worst possible moment, and running one at the edge of its capacity can cause brown-outs that damage the electronics and appliances you installed it to protect. An oversized one costs more up front, burns more fuel every hour it runs, and operates less efficiently under a light load. If you have critical medical equipment at home or you work from home and need constant power, getting the number right matters even more. Sizing it correctly the first time protects both your home and your budget.
Not every generator holds up to a Mat-Su Valley cold snap. The Cummins Quiet Connect standby generators we install and service are built to start and run in genuinely cold conditions: standard models operate down to 0°F, and extreme-cold models keep going to −40°F. As an authorized Cummins home generator dealer, we install units that are ready for exactly the conditions your family faces here, not a mild-climate average.
The calculator gives you a solid starting estimate, but every home is different. Older wiring, a large well pump, an electric furnace, or plans to add an EV charger or hot tub can all change the answer, and it is worth thinking about what you might add in the next few years rather than sizing only for today. That’s why the final step is a free, no-obligation in-home assessment with one of our licensed electricians. We’ll confirm the right size, walk you through placement and transfer switch options, and give you a clear quote, with no pressure. Call us at 907-671-9288 or finish the calculator above to get started.
It depends on which systems you want to run at the same time, not just your home’s square footage. Most Mat-Su Valley homes that want to keep their heat, well pump, refrigerator, and essential outlets running comfortably fall in the 13–20 kW range, while larger homes running electric heat, a hot tub, or an EV charger need more. The fastest way to know your number is to run the calculator above, then confirm it with a free in-home assessment.
A gas furnace and a 1/3-hp well pump together draw relatively little to run but spike when their motors start, so your generator has to cover that surge. A modern Cummins standby unit starting at 13 kW handles both easily, along with your lights and refrigerator. Add electric heat or a larger pump and you’ll want to size up. The calculator accounts for the starting surge automatically.
No. An oversized generator costs more to buy and burns more propane or natural gas every hour it runs, without giving you any benefit if you’ll never use the extra capacity. The goal is a generator sized to carry your real load with a safe margin, big enough to never overload, not so big that you’re paying for power you’ll never draw.
It gives a reliable estimate using the same running-watts-plus-starting-surge method a professional electrician uses, and it’s a great way to understand your ballpark size and cost. It can’t see everything about your specific home, though. Wiring age, exact appliance ratings, and future additions all matter. We confirm the final size during your free in-home assessment so your generator is sized exactly right.
Yes. AK Sparky’s Electric is an authorized Cummins home generator dealer serving Wasilla, Palmer, and the Mat-Su Valley. We handle the whole job, sizing, permitting, the automatic transfer switch, and installation, with licensed electricians. Finish the calculator or call 907-671-9288 to schedule your free assessment.
We install and service Cummins Quiet Connect home standby generators. They’re built for cold-weather reliability, with standard models running down to 0°F and extreme-cold models to −40°F, which is exactly what an Alaska winter demands. As an authorized Cummins dealer, we can size, supply, install, and support your generator start to finish.
The calculator gets you a number in about a minute. A licensed electrician gets you certainty. Call AK Sparky’s Electric at 907-671-9288 or schedule online, and we’ll do a free in-home load calculation and walk you through your options, with upfront pricing and no pressure.
Straight answers, upfront pricing, and a crew that shows up on time.
Ready when you are
Licensed, bonded & insured electricians serving Wasilla, Palmer, and the greater Mat-Su Valley.
