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Avatar for John Buckley Electric, Inc.
John Buckley Electric, Inc.
4.8(
120
)

Serving Colma, CA and surrounding areas

Approved

Super Service Award Winner

In business since 1989

Free estimates

Customers say: True professional

"I would definitely hire John again. He was on time, did a great job & was courteous and clean. I had old bad wiring & he was able to clean it up & install new fixtures without any hiccups. Definitely recommend!"
Response time3 hrs
Response rate91%
24 neighbors recently requested a quote
Avatar for CA Electrical Group 24/7
CA Electrical Group 24/7
4.7(
61
)

Serving Colma, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2002

Free estimates

Emergency services offered

"Ben did a great job installing our bathroom exhaust fan. He was on time, very clean and charged me the price he quoted. He even wore protective booties over his shoes while inside the house. I'm now looking for more projects for Ben to do. Thank You again, see you soon Ben."
apartment rewire
main service panel upgrade multi meters
tesla
new 3 phase commercial electrical panel
solar ready main panel

+123

Response time5 hrs
4 neighbors recently requested a quote
Recommended by80%of homeowners
Avatar for GAETAWAY ELECTRIC INC
GAETAWAY ELECTRIC INC
5.0(
13
)

Serving Colma, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2008

Free estimates

Warranties offered

"Not only was the job done in a timely fashion but was very clean… the customer service was top tier! …. Communication, punctuality, and sense of pride in their work lets you know you hired the right contractor for the job! …. They left the work area cleaner then it was before they arrived.. the work I had done was a panel upgrade and also install my Tesla EV charger… real game changer no more stopping at superchargers to charge my Tesla!…. Thank you to Gaetaway electric I’m able to commute to work an home no more pit stops!"
Exterior LED lighting and address
Pergola ceiling fan/lighting.
Tesla home electric vehicle charging station and conduit install.
Commercial LED high bay lighting.
Generac home electric vehicle charging station, conduit/outlet install.

+9

Response time1 day
8 neighbors recently requested a quote
Recommended by16%of homeowners
Avatar for pyramid electric
pyramid electric
4.9(
7
)

Serving Colma, CA and surrounding areas

Approved

In business since 2022

Emergency services offered

Customers say: True professional

"Alexis responded quickly, gave a fair estimate while explaining the process quickly. He was friendly, knowledgeable, efficient and thorough. I would highly recommend for any electrical work needed."
Upgrading an electrical panel
Electrical Project
Electrical Project
Taking pride on my craftsmanship
Electrical Project

+9

Response time2 days
1 neighbors recently requested a quote
Recommended by57%of homeowners
Emanuel Morales Electric
5.0(
28
)

Serving Colma, CA and surrounding areas

Approved

In business since 2018

Emergency services offered

Small jobs welcome

"Emanuel (and his daughter as helper!) did a great job installing a 240v EV charging station at my home last month. He was able to give me a bid after I sent him some pictures and rough measurements and when he came out to my home to do the installation, recommended a much better way to do the install (that no other electrician, even those who gave me bids after in-person visits, offered as an option). It's been working fine thus far.. I'd definitely recommend Emanuel. Thanks."
Response time3 hrs
Response rate94%
Recommended by92%of homeowners
Avatar for ARECHIGA POWER
ARECHIGA POWER
5.0(
12
)

Serving Colma, CA and surrounding areas

Approved

In business since 2022

Free estimates

Emergency services offered

"Ray was instrumental in upgrading the electrical in my townhome, including installing new recessed lights, light fixtures, replacing receptacles with new ones and modern cover plates. He also relocated and installed a new subpanel providing dedicated circuits to appliances and the newly installed recessed lights. Ray is incredibly knowledgeable and very easy to work with and I would recommend him and happily use his services again."
Living room
Kitchen
Meter Main Panel Upgrade
Meter Main Panel Upgrade
Meter Main Panel Upgrade

+36

Response time1 day
Recommended by66%of homeowners
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Showing 1-10 of 356
Generator Install questions, answered by experts

The amount of time a standby generator can run continuously is around 3,000 hours on average. However, standby generators can generally run indefinitely as long as they have a continuous fuel supply. Generators hooked up to a home’s natural gas supply are the best option for extended usage, as these won’t rely on a finite fuel supply based on how much you have in storage. Generators running on liquid propane or diesel won’t last as long, as these require fuel storage and regular refueling to stay running.

While diesel is relatively stable, it won’t last nearly as long as propane and you may have to replace it if it sits unused for too long. Diesel can sometimes struggle to work efficiently or start engines during especially cold weather, so it’s not the best choice for every climate. Compared to fuels like propane and natural gas, diesel generators tend to be noisier and create more exhaust, which isn’t always ideal for home use.

In some situations, yes. Never try to put biofuel into any home generator without checking the specifics first. If a generator has the ability to run on diesel, it can also run pure biofuel (the clear kind made from seed oils, for example). But if you are using biofuel made from animal fats or vegetable oils, the generator will need significant modifications before it can handle a sludgier type of biofuel.

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.

An undersized whole-house generator has the potential to overheat and shut down when you try to run a central AC system. This scenario can not only damage the whole-house generator, but can also trip your home’s breakers or cause electrical damage. To avoid this situation, hire a local generator installer to correctly size your whole-house generator.

The Colma, CA homeowners’ guide to generator installs

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