What size generator do you really need for a Texas home during a power outage?
To keep your basic necessities running like your refrigerator, lights, and a few fans, most Texas homeowners need a portable generator between 5,000 and 7,500 watts. If you want to run a window AC unit or a well pump, you should look closer to 10,000 watts, while a whole-home solution usually requires a standby unit starting at 20,000 watts. The right size depends entirely on which appliances you consider essential when the Texas grid takes a break.
Key Takeaways
- Start with the essentials: Focus on the refrigerator, freezer, and medical devices before adding luxury items.
- Calculate starting watts: Motors in appliances like AC units and fridges need a big surge of power just to kick on.
- Consider your fuel source: Decide if you want to store gasoline or if you have a propane hookup ready to go.
- Don’t forget the well pump: If you live out in the Hill Country and rely on a well, you need a 240V outlet and extra wattage.
- Maintenance is non-negotiable: A generator that won’t start during a storm is just a heavy paperweight.
Understanding Your Power Needs in the Hill Country
Howdy, neighbors. It is Doc Wally here. If you have lived around New Braunfels or San Antonio for more than a few seasons, you know our weather likes to keep us on our toes. Between the summer heat waves that strain the grid and those surprise ice storms that snap cedar limbs like toothpicks, having a generator isn’t just a luxury anymore. It is a part of being prepared.
I get calls all the time from folks asking what size generator they should buy. They go to the big box store, see a wall of shiny machines, and get overwhelmed by the numbers. Some folks buy way too much machine and waste money on fuel. Others buy a little unit that bogs down the second the fridge tries to kick on. Let’s walk through how to figure out exactly what you need so you are not left in the dark.
The Difference Between Running Watts and Starting Watts
This is the part that trips most people up. Every appliance has two numbers you need to care about. Running watts are what the tool uses while it is just humming along. Starting watts, or surge watts, are that extra burst of energy needed to get a motor spinning. Think of it like pushing a stalled truck. It takes a lot of muscle to get it rolling, but once it is moving, it is much easier to keep it going.
Your refrigerator might only need 700 watts to stay cold, but it might need 2,200 watts for a split second when the compressor starts. If your generator is too small, that surge will trip the breaker. When I am out doing generator repair in New Braunfels, I often see units that have been stressed out because they were constantly red-lining. You want a generator that can handle your total starting watts with a little bit of breathing room to spare.
Small, Medium, or Large: Which Category Fits You?
If you just want to keep the lights on, charge your phones, and keep the food from spoiling, a 3,000 to 5,000 watt portable unit is usually plenty. These are great because they are easier to move around and they do not drink fuel quite as fast. You can run a few lamps, your fridge, and maybe a TV to keep up with the weather reports.
Now, if you are like most of us in Central Texas and you cannot stand the heat, you might want to run a portable window AC unit or a couple of heavy duty fans. In that case, you are looking at the 7,500 to 10,000 watt range. This size is the sweet spot for most suburban homes. It gives you enough juice to live comfortably without feeling like you are camping in your own living room. It can also handle a microwave or a coffee maker, though you might have to turn off the AC for a minute while you brew your morning cup.
For my friends out in places like Spring Branch or Bulverde who are on well water, you have an extra challenge. Most well pumps require a 240V connection and a significant amount of starting wattage. You will likely need at least a 9,000 watt generator with a specific large outlet to get that water flowing so you can flush the toilets and take a shower.
Fuel Choices and Runtime
In Texas, we have to think about how long that power might be out. During the big freeze a couple of years back, some folks were without power for days. A generator is only as good as the fuel you have on hand. Gasoline is easy to find, but it goes bad if it sits too long. That is why I always tell folks to use a fuel stabilizer or, better yet, run their generator dry before storing it.
Propane is a popular choice around here because many of us have big tanks for our heaters or stoves. Propane does not go bad over time, and it runs a bit cleaner. Many new generators are dual-fuel, meaning they can run on either. It is a great option for flexibility when the gas stations have long lines or no power to run their pumps.
Safety and Connection
I cannot talk about generators without mentioning safety. Never, ever run your generator inside your garage or even near an open window. Carbon monoxide is a silent killer and it does not care how cold it is outside. Keep that machine at least twenty feet from the house.
Also, please do not try to backfeed your house by plugging the generator into a wall outlet. That is incredibly dangerous for you and for the linemen working to get the power back on. If you want to power your whole house, have a pro install a transfer switch. It makes life a lot easier and keeps everyone safe.
Keeping Your Investment Ready to Run
The biggest mistake I see is folks buying a generator, putting it in the shed, and forgetting about it until the lights go out. Engines do not like to sit. Seals dry out, and old gas turns into a sticky mess that clogs up your carburetor. I recommend starting your generator once a month and letting it run for about fifteen minutes under a small load.
If you pull that cord during a storm and nothing happens, do not panic. Give me a call. I see a lot of generators that just need a little TLC to get back in the game. Whether it is a gummed up carb or a fouled spark plug, I can usually get it humming again right there in your driveway.
If you are worried about your generator being ready for the next Texas storm, give Doc Wally a call or shoot me a text. We come to you in New Braunfels, Schertz, Cibolo, Seguin, Boerne, Spring Branch, Stone Oak, Bulverde, Garden Ridge, Converse, Marion, and all over the Hill Country. We will make sure your equipment is ready to work when you need it most.
People Also Asked
Can a 5,000 watt generator run a central AC unit?
No, most central air conditioning systems require much more power and a 240V connection that a standard 5,000 watt portable generator cannot provide. You would need a large standby generator for that.
How much fuel does a generator use per hour?
A typical 7,500 watt generator will use about half a gallon to three quarters of a gallon of gasoline per hour depending on the electrical load you put on it.
Is it okay to leave gas in my generator?
It is best to drain the fuel or use a high quality stabilizer if it will sit for more than a month, as modern ethanol gas can damage the carburetor quickly.
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