If your basement depends on a sump pump, you already know how vital it is during heavy rain. What many homeowners discover too late is that storms often knock out power at the exact moment the pump needs to run the most. A sump pump battery backup keeps water moving even when the grid fails. It steps in when your primary pump loses power, helping prevent flooding, mold, and costly damage to your foundation and belongings.

Watertight Plumbing installs, repairs, and maintains sump pump battery backup systems for homes and businesses across Lake County, Illinois, and Kenosha County, Wisconsin. Our licensed, bonded, and insured team brings more than 30 years of experience to every job. We deliver fast, reliable service so you can feel confident your basement will stay dry during the next storm.

• Power outages during storms leave basements vulnerable to flooding
• Even high quality pumps cannot run without electricity
• Sump pump battery backup offers a dependable safety net
• Backup systems protect your property and reduce stress

What is a sump pump battery backup and how does it work

A sump pump battery backup is a secondary pumping system with its own dedicated battery that automatically activates when your primary pump stops running. Most backups include a high efficiency DC pump, a float switch, a charger or controller, and a deep cycle battery. When water in the pit rises and power is out, the float switch triggers the backup pump to start removing water. Many systems also include alarms that notify you when the backup is engaged or when the battery needs service.

Primary vs backup sump pumps

Your primary sump pump is the main workhorse. It usually runs on standard household current and pushes water out of the basement as soon as the float switch lifts. The backup is the insurance policy. It sits ready to run when the primary does not have power or cannot keep up with high inflow. In some setups the backup also turns on if the primary pump fails due to motor wear, a jammed impeller, or a stuck float.

How long does a sump pump battery backup run

Runtime depends on the battery capacity, the pumping rate, and how often the pump cycles. A typical deep cycle 12-volt battery might deliver several hours to a full day of intermittent pumping. Many homeowners choose systems with larger AGM batteries or dual battery setups for extended protection. Watertight Plumbing can size a sump pump battery backup to match your pit volume, water table, and local storm patterns to maximize coverage.

Top benefits of installing a sump pump battery backup

• Protection during power outages when you need it most
• Redundancy if the primary pump fails or a breaker trips
• Peace of mind when you are sleeping or away from home
• Alarms and status lights that alert you to problems early
• Lower risk of basement flooding and mold growth
• Potential for insurance premium reductions due to mitigation
• Improved home resale appeal in flood prone areas

Types of battery backups for sump pumps

Battery chemistries: flooded lead acid, AGM, and gel

• Flooded lead acid: Affordable and widely available. Requires periodic water top ups and ventilation. Solid performance for most homes.
• AGM sealed lead acid: Maintenance free, spill resistant, and better in cold temperatures. Higher cost but reliable and clean.
• Gel cell: Stable and long lasting. Slightly less common for high discharge pumping and typically higher cost.

DC backup systems vs AC inverter systems

• Dedicated DC backup pump: Uses a separate 12 or 24-volt pump and controller. Efficient and purpose built for battery power.
• AC inverter backup: Uses a battery with an inverter to power your existing AC pump. Can be versatile but less efficient in extended outages.

Watertight Plumbing helps you choose the right sump pump battery backup for your home, taking into account cost, maintenance, expected runtime, and installation space in the sump pit.

Key features to look for

• Automatic switching that detects power loss and activates instantly
• A high output backup pump with a strong gallons-per-hour rating
• A smart charger that keeps the battery healthy without overcharging
• Audible alarms, silence buttons, and indicator lights for quick status checks
• Corrosion resistant components and sturdy check valves
• Compatibility with your existing sump basin and discharge line
• Optional Wi-Fi or cellular alerts for remote monitoring
• Expandable capacity for adding a second battery

Professional installation vs DIY

When a skilled DIY can work

• You have an uncomplicated pit with space for a second pump
• Your discharge line is accessible and up to code
• You understand battery safety, venting, and wiring basics
• You are comfortable testing floats, valves, and check fittings

Why hire a pro like Watertight Plumbing

• Code compliant installation with neat and secure wiring
• Correct pump sizing based on water volume and lift height
• Proper placement and anchoring to prevent float interference
• Backflow prevention and optimized discharge routing
• Battery selection matched to runtime needs and climate
• Full system testing, including power loss simulations
• Warranty protection and 24/7 emergency support

Water Tight Plumbing & Sewer, known to many customers as Watertight Plumbing, brings decades of local experience to sump pump battery backup installations. We handle everything from the first site check to the final test so your system is ready when the storm hits.

What a professional installation looks like

1. Evaluate the sump basin for size, depth, and inflow rate
2. Select the correct backup pump, controller, and battery
3. Mount or position the backup pump without obstructing the primary
4. Add or adjust check valves to prevent backflow and short cycling
5. Install the charger and secure the battery in a ventilated location
6. Wire the controller, sensors, and alarms per manufacturer specs
7. Test float activation and simulate a power outage
8. Confirm discharge flow and check for leaks or vibrations
9. Label components and review maintenance steps with the homeowner

Maintenance checklist to keep your backup ready

Monthly quick checks

• Verify indicator lights on the charger or controller
• Listen for unusual noises during a test cycle
• Confirm the float moves freely without obstructions

Quarterly deep checks

• Unplug the primary pump briefly to ensure the backup takes over
• Inspect terminals for corrosion and clean if needed
• Check battery voltage with a meter or use the system’s test function
• Ensure the discharge line and check valve are operating smoothly

Annual care

• For flooded batteries, top up with distilled water as required
• Replace batteries that fail load tests or are past service life
• Flush the sump pit to remove silt that can jam floats
• Schedule a professional inspection from Watertight Plumbing

Common problems and how to troubleshoot

• Alarm sounding constantly: Check for power to the charger, inspect battery connections, and verify the float is not stuck
• Short runtime: Battery may be undersized or near the end of its life. Consider upgrading to AGM or adding a second battery
• No pumping action: Confirm the backup is wired correctly, the impeller is clear, and the check valve is oriented correctly
• Frequent cycling: Adjust float height, inspect for check valve failure, and ensure discharge line has proper slope
• Corrosion on terminals: Clean with a baking soda solution and apply a protective spray

How much does a sump pump battery backup cost

Costs vary by pump size, battery type, and installation complexity. In Lake County, IL, and Kenosha County, WI, most homeowners invest in a midrange system that balances power and longevity. A quality setup with a durable backup pump, smart charger, and AGM battery often delivers the best value over time. While prices can vary, the cost of a reliable sump pump battery backup is usually far less than the expense of a flooded basement, mold remediation, and replacing damaged furniture or flooring.

Sump pump battery backup vs generator: which should you choose

A whole home generator can power your primary sump pump and other appliances. A generator is a smart option if you experience long outages. However, generators require fuel, maintenance, and time to start. A sump pump battery backup turns on automatically in seconds and does not rely on fuel or manual startup. Many homeowners choose both for layered protection. If you install a generator later, your battery backup still provides instant coverage until the generator takes over.

Frequently asked questions

Do I still need a sump pump battery backup if I rarely lose power

Yes. Outages are unpredictable, and they often happen during the heaviest rain. A sump pump battery backup protects you during the rare event that could cause the most damage. It is a relatively small investment for significant peace of mind.

Can I add a battery backup to my existing sump pump

In most cases, yes. Many systems are designed to work alongside your current pump. Watertight Plumbing can assess your pit, electrical setup, and discharge line to recommend a compatible solution.

How often should I replace the battery

Most batteries last 3 to 5 years depending on use, temperature, and maintenance. AGM batteries often offer longer service life. We recommend testing the battery quarterly and replacing it when tests show reduced capacity.

Will a sump pump battery backup handle heavy rain

It depends on the pump capacity and the inflow rate in your neighborhood. We can size a backup pump and battery bank to handle typical storm patterns in Kenosha, Zion, Waukegan, Gurnee, Libertyville, and nearby communities.

What happens if both pumps run at the same time

Many controllers allow the backup to assist the primary during extreme inflow. Properly installed check valves and floats keep flows coordinated. A professional setup ensures both pumps work together rather than compete.

Whole home water protection tips

Your sump pump battery backup is the heart of basement defense. Pair it with simple upgrades to create a complete moisture protection plan.

• Install water leak sensors near the sump pit, water heater, and laundry area
• Add a high water alarm with phone alerts for early warnings
• Keep gutters and downspouts clear so less water reaches your foundation
• Check grading around the home to steer rainwater away from the basement
• Consider a backup water powered pump if your city water supply is reliable

Why homeowners choose Watertight Plumbing

Watertight Plumbing, the local name for Water Tight Plumbing & Sewer, is a family owned company with more than 30 years of experience in residential and commercial plumbing. We are licensed, bonded, and insured. We respond 24 hours a day for emergencies and stand behind our work. From sump pump battery backup systems to full plumbing upgrades, we deliver craftsmanship you can trust.

• 24/7 emergency service for floods, sewer backups, and burst pipes
• Expert sump pump installations, repairs, and battery backup systems
• Sewer inspections, rodding, drain cleaning, and line repairs
• Water heater services for gas, electric, and tankless systems
• Plumbing installation and repair for fixtures, water lines, and toilets
• New construction and remodeling support for homes and businesses
• Local service across Kenosha, Zion, Waukegan, Gurnee, Libertyville, and surrounding towns

Service areas we cover

Watertight Plumbing serves Lake County, Illinois, and Kenosha County, Wisconsin. Our team understands local soil conditions, water tables, and storm patterns, which helps us size and install the right sump pump battery backup for your property. Local knowledge matters when minutes count during heavy rain.

How to get started today

If you are ready to protect your basement with a reliable sump pump battery backup, our team can help. We will assess your current system, recommend options that fit your budget, and install a professional backup that activates the instant power goes out. We will test the setup, show you simple maintenance steps, and be available around the clock if you ever need us.

For fast help or a free estimate, call Watertight Plumbing at 847-623-6810 for Lake County or 262-484-4520 for Kenosha County. Keep your basement dry, protect your foundation, and rest easy knowing your sump pump battery backup is ready to work when the power is not.