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TRUSTED BY ROCHESTER, MI HOMEOWNERS

  • Average homeowner rating star icon4.5
    Average homeowner rating
  • Verified reviews icon29
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Find Generator install pros in Rochester

St. John Electric
4.9(
69
)
Fixed Generator - InstallPortable Generator - Install

Serving Rochester, MI and surrounding areas

Approved

In business since 2012

Free estimates

Credit card accepted

"I would give Kevin and St. John Electric 10 stars if I could. He put in a fairly challenging outlet for me and also a second outlet for a freezer in the basement and did an excellent job. Very reasonable pricing. I will definitely be calling him in the future for a generator installation. I recommend him highly and without reservations."
Response time1 day
3 neighbors recently requested a quote
Recommended by89%of homeowners
Avatar for Electrician Near Me LLC
Electrician Near Me LLC
5.0(
14
)
Generator - Install - For Business

Serving Rochester, MI and surrounding areas

Approved

Free estimates

Emergency services offered

Warranties offered

"Andrew came to our house between Ann Arbor and Plymouth at 8 PM on Tuesday when a storm caused an electrical outage. We had a generator but we're only getting partial power in the house. Andrew ran tests inside the house, determining that not enough power was coming into the house. He then started testing different areas of the generator until he found the part not working. Once he located the problem, he quickly fixed it. Because he didn't give up on me or my problem, he restored electricity, saving me hundreds from food spoilage in a refrigerator and freezer. I don't think most electricians would have stuck with the problem or been able or willing to fix the generator. If I could give more than 5 stars, I would."
Service panels
Wholehouse Generator
New Panel
New construction
8 neighbors recently requested a quote
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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.

Many services include assembling the unit and securing it in the window. Confirm with your provider.

DIY is possible for basic setups. Professional installation ensures safe and proper electrical connections.

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

Yes, natural gas generators can work without electricity. Natural gas generators are a common type of backup or whole-house generator that operates when the electrical grid isn’t working. The trick is using a transfer switch (which usually needs to be installed with the generator) that safely switches the home electrical system from the power grid to generator power when needed.

The Rochester, MI homeowners’ guide to generator installs

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