What is the lifespan of a whole-house generator?

<div>When maintained properly, a whole-house generator can last up to 20 years. <a href="https://www.angi.com/articles/how-much-does-generator-repair-cost.htm">Costs to maintain and repair generators</a> vary by location and type of generator, but you can expect to pay about $150 to $300 per year for annual generator maintenance checks. An experienced generator service technician will inspect your generator’s engine filter, starting mechanism, fuel, lubrication, and coolant levels to keep your generator in good working condition for as long as possible. </div>

How do I know what size generator I need?

<div>When <a href="https://www.angi.com/articles/what-size-generator-do-i-need.htm">choosing the right size generator</a> for your needs, consider a few items to help calculate the wattage you’ll need. Start by determining which household items and appliances you want to power, and then add the wattages together. Check out the wattage of these essential appliances:<ul><li>Refrigerator: 600 watts</li><li>Large dehumidifier: 700 watts</li><li>Large window air conditioner: 1,400 watts</li><li>Water heater: 3,000 watts</li></ul>Running home appliances like these requires a partial or whole-house generator. A portable generator may be enough to power your home if you only plan to keep a refrigerator and freezer running. </div>

What can I run on different generator sizes?

<div>Here’s what you can run with different wattages and types of generators:Portable generator:<ul><li>2,000 watts can handle a large appliance like a freezer or refrigerator, plus a few smaller items like phones or computer chargers. </li><li>4,000 watts will keep two large appliances operating and a few smaller devices.</li><li>8,000 watts should power most essential appliances and other devices, including a sump pump, well pump, or your dishwasher.</li></ul>Partial to whole-house generator:<ul><li>20,000 watts and above will make it seem like your home’s power is still on.</li></ul></div>

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Q: How much does a whole-house generator cost?

<div><a href="https://www.angi.com/articles/how-much-does-it-cost-install-generator.htm">Installing a whole-house generator costs</a> about $5,000 on average. Prices range from $1,550 to $8,500, depending on size, brand, fuel type, and assembly. The size of your whole-house generator is the most significant cost factor, with large homes with high energy demands costing the most to power. Types of whole-home generators include:<ul><li>Portable generators with 1kW&ndash;7.5kW capacity: $500&ndash;$2,000</li><li>Partial generators with 9kW&ndash;20kW capacity: $2,000&ndash;$6,300</li><li>Whole-house generators with 22kW&ndash;48kW: $5,000&ndash;$18,000</li></ul></div>

Q: What can I run on different generator sizes?

<div>Here&rsquo;s what you can run with different wattages and types of generators:Portable generator:<ul><li>2,000 watts can handle a large appliance like a freezer or refrigerator, plus a few smaller items like phones or computer chargers. </li><li>4,000 watts will keep two large appliances operating and a few smaller devices.</li><li>8,000 watts should power most essential appliances and other devices, including a sump pump, well pump, or your dishwasher.</li></ul>Partial to whole-house generator:<ul><li>20,000 watts and above will make it seem like your home&rsquo;s power is still on.</li></ul></div>

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*The Angi rating for Generator Install companies in Angwin, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Generator Install needs.

*The HomeAdvisor rating for Generator Install companies in Angwin, CA is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Generator Install needs.

Last update on August 17, 2025

Reviewed in July 2016
The fan was installed with great efficiency. We have used Precision Electric over the past 9 years and they have always been excellent in response, quality, installation satisfaction and reasonable price. From a simple lighting fix to a complete home generator or home media system, Dave is the...
Precision Electric
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Reviewed in April 2020
Excellent work. Professional and helpful electricians - who consulted during work being performed - making excellent suggestions.
Precision Electric
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Reviewed in February 2022
They did an outstanding job and I would highly recommend them to anyone. I would definitely hire them again.
ABT Plumbing Electric Heating & Air Conditioning
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Reviewed in April 2014
The part of the gas generator that is the issue will need a great deal of work, but for our peace of mind we decided to go propane as it will be a much easier issue for us down the line.
HIGH SIERRA ELECTRIC and GENERATORS
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Reviewed in November 2013
The service was performed, but I never received the key or instructions. I also received a quote later for my own home (next door to the rental). When I informed Edison that I had gone with another (substantially cheaper) contractor for my own home, he became irate, and basically said good luck...
HIGH SIERRA ELECTRIC and GENERATORS
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Reviewed in December 2016
Russ came to my home, reviewed the site and took photos. A few days later I received a call from Ed, who had not been to the site. Ed told me in broad generalities that my existing setup is incorrect and "needs to be reworked." I asked him twice for specifics, which he refused to provide. He...
HIGH SIERRA ELECTRIC and GENERATORS
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Generator install pros in Angwin

Fatima Electric, Inc.

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