What Size Generator Do I Need? A Step-by-Step Sizing Guide
What size generator do I need? Walk through running vs starting watts, AC surge, essential vs whole-home circuits and a sample sizing worksheet for your home.
Reliable and Expert Generator Services for Your Home and Business
When the grid goes down, your generator has one job. JaWilly Services keeps standby and portable units ready for that moment — and answers the phone 24/7 when one won't cooperate. We serve homes and businesses across Houston and the surrounding communities.
Comprehensive Generator Services Tailored to Your Needs
We handle the full life of a backup power system — installation, routine maintenance, diagnostics, repairs and emergency response. Every visit starts with finding out what your generator is actually doing, then fixing it with quality parts so it starts the next time the lights go out.
Generator Diagnostics
Pinpoint testing that finds the real cause of a no-start, a fault code or a weak output before any part is replaced.
Learn more about Generator Diagnostics
Emergency Generator Support
Call or text 24/7 when your backup power fails mid-outage — a technician gets your home or business running again.
Learn more about Emergency Generator Support
Generator Parts & Replacement
OEM-approved batteries, starters, regulators, filters and controller components, installed and tested on site.
Learn more about Generator Parts & Replacement
Commercial Generator Solutions
Installation, scheduled maintenance and repair programs that keep offices, shops and facilities powered.
Learn more about Commercial Generator SolutionsPowering Houston with Reliable Generator Services
From Montrose bungalows to warehouses off the Beltway, the region’s power problems come from the same places: summer thunderstorms, tropical systems, winter freezes and an overloaded grid. Our technicians focus on the parts that fail most often in this climate — batteries cooked by heat, corroded connections, stale fuel and transfer switches that haven’t been exercised in months — so your system is ready before the next warning is issued.
You get a straight explanation of what we find and a clear price before work begins. If the fix is a simple part rather than a new generator, we will say so.
Your trusted partner for 24/7 generator support in Houston and beyond. Reliable. Fast. Efficient.
Why Choose JaWilly Services for Your Generator Needs?
A generator that fails during an outage costs more than the repair: spoiled food and medicine, flooded crawl spaces when the sump pump stops, closed doors at a business. That is why we built JaWilly Services around fast response and honest diagnostics rather than upselling equipment — read more about our team and how we work.
Our certified technicians service most major makes and models, and we keep you informed at every step — what failed, why it failed and what it will take to prevent a repeat. We offer transparent pricing and upfront quotes, so there are no surprises on the invoice.
- 24/7 emergency availability by phone or text
- Experienced, certified generator technicians
- Prompt service in Houston and surrounding areas
- Thorough diagnostics before any part is replaced
- Quality OEM-approved parts and careful workmanship
- Transparent pricing and honest advice
How a Service Call Works
- Tell us what's happeningCall or text 832-418-7218 with the generator's make, the symptoms and any error code on the controller.
- On-site diagnosisA technician inspects the unit, tests the battery, fuel, engine and transfer switch, and confirms the root cause.
- Clear quoteYou hear what failed and what it will cost before any repair or parts replacement begins.
- Repair and test runWe fix the problem, run the generator under load and make sure it transfers power the way it should.
Generator Service Areas Around Houston
JaWilly Services covers the city of Houston and the suburbs around it. Pick your community for local details, or see the full service area overview.
Houston, TX
Generator repair, diagnostics and 24/7 emergency service across the city's neighborhoods and business districts.
Houston generator service
Katy, TX
Standby generator care for fast-growing west-side subdivisions and the businesses that serve them.
Katy generator service
Sugar Land, TX
Diagnostics, maintenance and parts replacement for Fort Bend County homes and offices.
Sugar Land generator service
The Woodlands, TX
Backup power support for wooded neighborhoods where storms bring down lines north of Houston.
The Woodlands generator service
Pearland, TX
Emergency repair and routine service for Pearland households and Brazoria County businesses.
Pearland generator service
Pasadena, TX
Dependable generator service for Pasadena homes, shops and industrial-corridor operations.
Pasadena generator service
Get Your Generator Back to Peak Performance
Is the unit throwing a fault code, failing its weekly exercise or refusing to start? Our team diagnoses and repairs all types of generators, from air-cooled home standby units to large commercial sets. Don’t let a faulty generator leave you in the dark — book a visit before the next storm, not during it.
Generator Advice from Our Blog
Generator Won't Start? 8 Warning Signs You Shouldn't Ignore
Generator won't start or acting up? Learn the 8 warning signs that usually come first, what each one may point to, and when to book professional diagnostics.
Hurricane Season Generator Checklist for Houston Homes and Businesses
A Houston hurricane season generator checklist: when to book service, fuel planning, load testing, portable generator safety and what to check after flooding.
Frequently Asked Questions
Do you offer 24/7 emergency generator repair in Houston?
Yes. Emergency support is available 24 hours a day, 7 days a week. Call or text 832-418-7218 and describe what the generator is doing so the technician can arrive prepared. Standard, non-emergency appointments are booked Monday through Friday, 8:00 AM to 5:00 PM.
Do you work on both home and commercial generators?
We do. JaWilly Services diagnoses, repairs and maintains residential standby and portable generators as well as the larger units that offices, retail sites and facilities rely on. Commercial customers can also arrange installation and scheduled maintenance.
Which areas do you serve?
We serve Houston and nearby communities including Katy, Sugar Land, The Woodlands, Pearland and Pasadena. If your address is outside those cities, call — we may still be able to help.
How often should a standby generator be serviced?
Most manufacturers call for routine service at least once a year, plus more frequent checks for units that run often or protect critical equipment. Your owner's manual sets the exact interval; we can set up a schedule that follows it and gets your unit inspected before hurricane season.
Get In Touch with JaWilly Services
A quick question, a maintenance visit or a generator that just quit in the middle of a storm — call or text 832-418-7218 any time, or email Jawillyservices@gmail.com for non-urgent requests.