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Avatar for Gridwise Electric
Gridwise Electric
5.0(
10
)
Portable Generator - RepairFixed Generator - InstallFixed Generator - Repair+3 more

Serving San Anselmo, CA and surrounding areas

Approved

In business since 2025

Free estimates

Warranties offered

"Gridwise handled the electrical component of our solar wiring project. Stas explained what was included and what could change depending on what they found in the panel, which I thought was super nice and thoughtful. On site, Enrique and the crew were calm and methodical. When a small issue popped up, they gave options (with trade-offs) rather than just making us accept the issue. Everything looks clean, and inspection went through without issues. Would def recommend them to friends and fam for any future projects!"
Junction box
Main panel
Framing phase
Construction Electrical
Construction Electrical

+3

14 neighbors recently requested a quote
Avatar for Sonoma Coast Electric, Inc
Sonoma Coast Electric, Inc
5.0(
7
)
Fixed Generator - InstallGenerator - Install - For BusinessPortable Generator - Install

Serving San Anselmo, CA and surrounding areas

Approved

In business since 2024

Free estimates

Warranties offered

"I had 2 ceiling fan/lights installed in the bedrooms. Installation included 2 new circular circuit boxes in each bedroom ceiling. In addition, I replaced the kitchen ceiling light with an LED fixture. The 2 workers were very polite and professional and worked quickly and efficiently, in addition to being respectful of my personal belongings."
Multimeter Test
100 amp Sub Panel
100 amp Sub Panel
Installing Unistrut
Stripping Wire

+3

Response time1 day
Response rate100%
16 neighbors recently requested a quote
Avatar for E Fitzgerald, Inc.
E Fitzgerald, Inc.
4.2(
27
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install - For Business+1 more

Serving San Anselmo, CA and surrounding areas

Approved

In business since 2014

Free estimates

Emergency services offered

"The consultation with Sean was very helpful and corrected the unit we actually needed. The work was done in a timely way, very professional and thorough. The hook up of the transfer switch was perfect on the trial runs with the generator. Sean has quiet confidence that he communicated with me and gave me the trust I needed to work with his family business that was new to me. I would go right back to Fitzgerald again. Good team, good work, and good service."
Electrical
Response time2 days
15 neighbors recently requested a quote
Recommended by66%of homeowners
Avatar for Christopher Robert Ceinar
Christopher Robert Ceinar
5.0(
14
)
Fixed Generator - InstallPortable Generator - Install

Serving San Anselmo, CA and surrounding areas

Approved

In business since 2023

Offers commercial services

"We needed to install an EV charger receptacle quite far from the electrical panel. Chris suggested leading individual wires through a conduit instead of simply using Romex, saying that heat characteristics are better. He also wanted to know what EV charger we were getting and asked for documentation. We also discussed other aspects of the work. His genuine interest and attention to detail made us choose him. At the end, we were impressed with the quality of the work he delivered and how easy it was to communicate with him. He charged about the average price for this work but delivered more than many other electricians would do."
2 neighbors recently requested a quote
Avatar for Golden Bay Electric
Golden Bay Electric
4.9(
29
)
Portable Generator - Install

Serving San Anselmo, CA and surrounding areas

Approved

In business since 2021

Free estimates

Emergency services offered

"Edgar is very detailed, respectful, professional with very good customer service! He showed up on time and completed the electric panel change sooner than expected! I have already referred him to my cross the street neighbor, Diane. Hopefully she will reach out soon for an estimate to change out her electrical panel too. Thank you ð ð"
Response time2 days
1 neighbors recently requested a quote
Recommended by92%of homeowners
Avatar for Bragg Home Services
Bragg Home Services
4.7(
46
)
Fixed Generator - Install

Serving San Anselmo, CA and surrounding areas

Approved

In business since 1968

Free estimates

Small jobs welcome

"They did a great job from beginning to end. They explained how the heat pump would work, installed it and I passed my HERS test in a 100 year old beach bungalow."
Response time2 days
Response rate100%
120 neighbors recently requested a quote
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Generator Install questions, answered by experts

No, you should never plug a generator directly into a wall outlet in your house. This practice is extremely dangerous, often illegal, and can cause "back-feeding," where power from the generator flows back into utility lines, creating a life-threatening hazard for utility workers. It can also damage your home's electrical system, including appliances like pumps and HVAC fans. If the main power is restored while the generator is connected, it can destroy the generator and cause an electrical fire. To safely connect a generator, you must use a professionally installed transfer switch or an interlocking kit, which prevents back-feeding by disconnecting your home from the utility grid before the generator provides power.

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.

Natural gas and electricity rates vary significantly based on location, and pricing can change over time, too. It’s possible that in locations where natural gas is particularly inexpensive, it will cost less than grid-based electricity will. However, you should also factor in the generator’s initial costs and maintenance needs, as well as its noise level and if it can comfortably power all your home appliances.

Generators are usually sized by running watts and starting watts. Ideally, you’ll want a generator that can offer both the necessary running watts and starting watts for everything you need to power without going beyond 90% of its capacity. Calculate your home’s electrical load based on the breakers in your home or adding up the appliance and lighting needs of connected rooms.

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.

The San Anselmo, CA homeowners’ guide to generator installs

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