Battery Backup for Houston Homes on a Well: Keeping Water Running

If your home runs on a private well, a power outage does not just take your lights. It takes your water. No electricity means the well pump stops, and with it your drinking water, toilets, and showers. A home battery can keep that pump running, and the key spec is surge: a well pump draws a brief burst of power at startup, and the Eos smart controller handles 17.1 kW of surge, far more than any residential well pump needs to start.

Key Takeaways

• A well pump stops the instant the grid goes down, cutting drinking water, toilets, and bathing for the whole house.
• Well pumps draw modest running power but a large starting surge. A 1 HP pump runs near 1,400 watts and spikes to roughly 2,500 to 3,750 watts at startup (Franklin Electric AIM Manual, 2021).
• The Eos smart controller delivers 11.5 kW continuously and 17.1 kW of surge, clearing a well pump's startup spike with wide headroom.
• Size a Pro (27 kWh) system to run the well plus fridge, lights, and Wi-Fi through a multi-day outage; step up to Premium for higher draw.
• About 42.5 million Americans, roughly 13% of the population, rely on their own well water (USGS, 2015).

Can a home battery run a well pump during a Houston outage?

Yes. A home battery can run a well pump, and the deciding factor is how the system handles the pump's startup surge, not its running power. A well pump draws a short, sharp burst of current the moment its motor starts, several times its steady draw. If the power source cannot supply that spike, the pump stalls or trips.

The Eos smart controller is built for exactly this. It supplies 11.5 kW continuously and 17.1 kW of surge for the brief starting moment. That headroom clears the inrush of any common residential well pump and then settles back to the pump's modest running load.

How much power does a well pump use?

A residential well pump uses less running power than most people expect, but its startup surge is large. Common single-phase submersible pumps run around these figures, with the starting spike commonly cited at two to three times the running draw (Franklin Electric AIM Manual, 2021; Oakville Pump Service, 2021):

• 1/2 HP pump: about 700 to 1,000 watts running, 1,500 to 3,000 watts starting.
• 1 HP pump: about 1,400 to 1,500 watts running, 2,500 to 3,750 watts starting.
• 1.5 HP pump: about 1,700 to 2,000 watts running.

The chart below shows why the surge, not the running load, is the number that matters, and how much headroom the controller has over it.

What size battery do you need for a well?

For most well homes, the Pro system at 27 kWh is the right target. It has the surge to start the pump and enough stored energy to run the pump plus a refrigerator, lights, and Wi-Fi through a multi-day outage. The pump only runs in short cycles when someone uses water, so its daily energy use is smaller than its wattage suggests.

If you have a larger 1.5 HP or 2 HP pump, a bigger household, or you want to keep the air conditioning cycling as well, step up to the Premium 36 kWh system. To match a system to your specific pump and household, compare capacities on the plans page.

What does an outage on a well look like without backup?

Without backup, a well home loses water the moment the grid fails. There is no flushing toilets, no showers, and no tap water for drinking or cooking until either power returns or you haul in stored water. FEMA and the CDC recommend storing at least one gallon of water per person per day, with a three-day minimum and a two-week supply if you can manage it (Ready.gov; CDC).

After Hurricane Beryl, many Houston-area homes waited days for power. On a well, that is days without running water for a family. A battery that keeps the pump alive turns a sanitation emergency back into an ordinary inconvenience. For the broader picture of what a home battery covers, see our

.

Where are private wells common around Houston?

Private wells cluster on the metro's rural fringe. Because the Harris-Galveston Subsidence District restricts new groundwater pumping across much of greater Houston, private wells inside Harris County proper are largely limited to outlying areas, while they are common on acreage in Montgomery County and the outer edges of Fort Bend. Communities around Tomball, Magnolia, Hockley, and rural Cypress frequently run on well water rather than a municipal utility.

If you are in the northwest corridor, our

covers the local outage and permitting picture in more detail.

Prefer to talk it through? Call Eos at 713-207-2222 for a same-week site survey.

Frequently asked questions

Can a home battery start my well pump?

Yes. Starting a well pump takes a brief surge of power several times its running draw, and the Eos controller supplies 17.1 kW of surge, well above what any common residential well pump needs to start.

What size battery do I need for a 1 HP well pump?

A Pro 27 kWh system covers a 1 HP pump plus a fridge, lights, and Wi-Fi through a multi-day outage. A 1 HP pump runs near 1,400 watts and spikes to roughly 2,500 to 3,750 watts at startup, both well within the system's range.

How long will a battery run my well pump?

Longer than you might think, because the pump only draws power in short cycles when water is used, not continuously. A Pro system running the pump plus essentials generally covers a multi-day outage for a typical household.

Do I need to back up my pressure tank or water softener too?

The pressure tank is passive and needs no power. A water softener uses very little and can be included on the backed-up circuits. The pump is the load that actually needs the surge and the runtime.

Can a battery power a whole home on a well?

Yes. Sizing up to Premium or Ultimate lets the system run the well pump alongside air conditioning and the rest of the home. The well pump itself is a small part of the total load once it is running.

This article explains battery backup for well-water homes near Houston and reflects Eos specifications as of July 2026. Final sizing depends on your pump and household and is confirmed at the free site survey.