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Avatar for EIGHT ELECTRIC LLC
EIGHT ELECTRIC LLC
5.0(
22
)
Fixed Generator - Install

Serving Tisbury, MA and surrounding areas

Approved

In business since 1996

Free estimates

Warranties offered

"Extremely satisfied with Andy and Kyle. They are both professional, knowledgeable and personable. They installed a new motor in the attic for our bathroom exhaust fans. A previous electrician had told us it would take maybe a few weeks to a month or more before he could secure a new motor. Andy got us one within a day! He also was able to diagnose and fix a crazy mess left from that previous electrician with wiring our old timer unit. We are so thankful we finally found a decent, caring electrician and would hire them again in an instant. We put our trust in them and were not disappointed. We highly recommend Belcastro Electric."
Ashburnham Solar
Kitchen Lighting
Chatham Fishing Dock
Lynn Seaport Marina
Rocky Point Fishing Pier

+168

2 neighbors recently requested a quote
Recommended by70%of homeowners
K. Opperman Electric
5.0(
10
)
Portable Generator - Install

Serving Tisbury, MA and surrounding areas

Approved

In business since 2016

Free estimates

Warranties offered

We are a locally owned and operated company that values honesty and integrity in all aspects of our business. Not only are we focused on quality work and outstanding results, we are also committed to educating our clients through our wide range of expertise, in turn creating a level of value unmatched by any of our competitors. We look forward to building lasting relationships with our clients and guarantee your satisfaction!

Service repair
Service repair
Recommended by100%of homeowners
Avatar for Services & More LLC
Services & More LLC
4.7(
27
)
Portable Generator - Repair

Serving Tisbury, MA and surrounding areas

Approved

Free estimates

Emergency services offered

Warranties offered

Services & More LLC delivers comprehensive handyman services and full property maintenance. Our team handles home repairs, renovations, and exterior improvements, including carpentry, plumbing, electrical, painting, landscaping, and hardscaping.\n\nOur outdoor services include tree trimming, cutting, and full removal of any size or capacity, professional bush and shrub pruning, seasonal cleanups, lawn care, and bed maintenance. For structural and aesthetic upgrades, we specialize in patios, walkways, retaining features, custom deck construction, and siding repairs or replacements — all built with durability, safety, and curb appeal in mind.\n\nInside the home, our capabilities range from minor repairs such as drywall patching, fixture installation, and furniture assembly to larger projects including kitchen remodels, bathroom upgrades, and full carpentry builds\n

Furniture Assembly
Bathroom Remodel
Bathroom Remodel
Bathroom Remodel
Bathroom Remodel

+4

109 neighbors recently requested a quote
Avatar for Northeast Power, LLC
Northeast Power, LLC
5.0(
3
)
Fixed Generator - InstallFixed Generator - RepairPortable Generator - Repair+3 more

Serving Tisbury, MA and surrounding areas

Approved

In business since 2022

Free estimates

Emergency services offered

"My solar inverter stopped working in my existing solar system, and since my original installer went out of business, I had a hard time finding someone to replace the inverter provided by SolarEdge. It was a small job, and most large companies weren’t interested, while those willing to help were booked out for at least a couple of months. I contacted Justin, and he replaced the inverter within just a few days. He was very friendly, efficient, and offered a very reasonable price. Justin was also extremely knowledgeable, explained everything clearly, and kept me updated throughout the process. He arrived on time, completed the work neatly, and made sure the system was running perfectly before leaving. Overall, his professionalism, honesty, and dedication to customer satisfaction made the whole experience stress-free and smooth."
Northeast Power
Northeast Power
Northeast Power
Northeast Power
Northeast Power

+2

60 neighbors recently requested a quote
Recommended by66%of homeowners
Avatar for Champion Electrical Services Inc
Champion Electrical Services Inc
5.0(
20
)
Fixed Generator - InstallGenerator - Install - For BusinessPortable Generator - Install

Serving Tisbury, MA and surrounding areas

In business since 2025

Free estimates

Emergency services offered

"Jason, has been an important resource for us over the last 7 years as we have renovated 2 old homes. Panel upgrades, wiring, appliance installation, stand by generator installation, electrical inspections etc. etc. He and his firm are very trustworthy, professional and skilled."
Showing 1-10 of 38
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.

It’s usually better to repair your generator if it isn’t working properly, as it will typically be much more affordable and should yield similar results. Generator repairs cost around $300 on average, while installing a new whole-house generator costs around $5,000 on average. The only exception is if you know your generator is reaching the end of its useful life, usually between 30 and 40 years. If you have an older generator, you could face multiple repairs in the coming years, which might mean that a full replacement will be more cost-effective over time.

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

Generally, you’ll want to keep between 60 and 70 feet between the generator and the transfer switch. There are a few reasons for this, including:

  • The distance reduces the noise coming from the generator into your home.

  • It increases efficiency because you won’t have a voltage drop from this short of a distance.

  • Prevents carbon monoxide poisoning: keep at least 15 feet between your generator and an open window. 

A 10,000-watt generator can run a small to mid-sized central AC unit (typically up to 3 tons or 36,000 BTU) along with a few other appliances. However, larger AC units or additional loads will require a bigger generator. Consult a local generator installer to ensure you add the correct size generator to your home.

The Tisbury, MA homeowners’ guide to generator installs

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