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Avatar for Martell Electric, LLC
Martell Electric, LLC
4.4(
41
)
Generator - Install - For Business

Serving Dowagiac, MI and surrounding areas

In business since 2009

Free estimates

Credit card accepted

"They promptly installed two generators, one for each house, and walked through the app install. They called me a year later to schedule yearly maintenance. Great all the way around."
Response time2 days
Recommended by94%of homeowners
Michigan Critical Power
4.8(
8
)
Fixed Generator - InstallGenerator - Install - For Business

Serving Dowagiac, MI and surrounding areas

In business since 2002

Free estimates

Credit card accepted

"I’ve been using Michigan Critical Power for several years to service my generator, and they’ve consistently delivered exceptional service. Their technicians are always on time, highly skilled, and clearly well-trained. What stands out most is their honesty and customer-first mindset — they truly look out for your best interests. I’ve never had a single issue with their work, and I can confidently say they’re reliable in every sense of the word. If you need generator service, I’d highly recommend giving them a call.”"
Response time3 days
Recommended by83%of homeowners
Avatar for Electrical Edge
Electrical Edge
4.5(
6
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install+4 more

Serving Dowagiac, MI and surrounding areas

In business since 2010

Free estimates

Emergency services offered

"We have a smoke alarm that is located 20 feet u from the floor. Several people declined to come out, including one that wanted $89 just to come and give us an estimate. The $89 did not apply toward the estimate if we accepted. Richard Riley, from Electrical Edge, had us text a picture and said he would be happy to do the job. He showed up on time and was very professional. We plan to use him on some other projects as well. Chris and Chuck Gibson Scotts, MI"
Recommended by100%of homeowners
Avatar for A2Z Services
A2Z Services
2.5(
28
)
Portable Generator - Repair

Serving Dowagiac, MI and surrounding areas

In business since 2007

Free estimates

"Keith and Mike were wonderful. Great service and knowledgeable in their craft. The weather was terrible when they came to install my decorative outside shutters and they still got the job done in a timely manner. I will use them again and listen to their suggestions!"
Mobile Home Demolition
Mobile home Demolition
Front Yard Grading & Black Dirt
Response time6 hrs
Recommended by81%of homeowners
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Generator Install questions, answered by experts

To determine the right size generator for your house, you should calculate the total wattage of the appliances and devices you want to power during an outage. List all essential items, note their start-up wattages, and add them together.

Here are some typical wattage requirements for common appliances:

  • Refrigerator: 600 watts

  • Large dehumidifier: 700 watts

  • Large window air conditioner: 1,400 watts

  • Water heater: 3,000 to 4,500 watts

  • Electric furnace: 5,000 to 25,000 watts

A 7,500-watt generator might be sufficient for essentials like a refrigerator, freezer, well pump, and lighting circuits. However, for high-demand items like a water heater or furnace, a whole-home generator is a better choice. A portable generator may be enough if you only need to power a few critical items.

While home square footage can offer a rough estimate, it is not always a reliable indicator. For reference, here are some typical generator sizes based on square footage:

  • 1,000 sq ft: 6–9 kW

  • 1,500 sq ft: 7–10 kW

  • 2,000 sq ft: 10–14 kW

  • 2,500 sq ft: 12–16 kW

  • 3,000 sq ft: 16–20 kW+

For the most accurate sizing, consult a professional who can calculate your home's peak and average power consumption and recommend the optimal generator.

To power a central air system during a power outage, the whole-house generator will need to be at least 5,000 watts, and this number will significantly increase for larger units. Check the specific wattage requirements of your AC unit to choose the right generator size. Consider consulting a generator installer to ensure your whole-house generator meets your electrical load needs.

To reduce AC startup power for a whole-house generator, install a soft start kit or hard start capacitor, which lowers the initial surge by gradually ramping up the compressor. Using a smart load manager can also help by staggering startup loads, preventing a system overload and future costly repairs.

Costs depend on generator type, labor, and additional wiring or transfer switch requirements.

Whole-house generators can run continuously for extended periods, even for weeks at a time (around 400 to 500 hours), as long as they have a sufficient fuel supply. However, this type of extensive use will increase wear and tear and can shorten the generator's overall lifespan. During long periods of operation, it's important to check and refill the engine oil as needed, potentially as frequently as daily depending on the model. If your generator uses a fuel tank, ensure it is kept full to prevent unexpected shutdowns.

The Dowagiac, MI homeowners’ guide to generator installs

From average costs to expert advice, get all the answers you need to get your job done.