How Long Does A Whole House Battery Backup Last?


We all know how bad it can be when the power goes off during a storm. Luckily, we now have a reliable and affordable solution to help keep your home powered on in the event of a power outage. When you need to keep your lights, refrigerator, computer, and other appliances running during a power outage or natural disaster, a whole-house battery backup is one of the most important emergency supplies you can have.

Now a question arises what are the limitations of a whole house battery backup? How long it can last? What is the needed battery capacity for maintaining a steady flow to the lights, refrigerator, and other electronics? Read on to learn about these and more questions.


Battery Backup Capacity

Whole house battery backup systems are designed to provide power for a set period of time, usually between 4 and 24 hours. The amount of time that your system will last depends on the capacity of your battery, or how much power it can store.

Most batteries used for energy backup systems have a capacity between 10 and 100 kilowatt-hours (kWh). The average home uses about 30 kWh of electricity per day, so a 10 kWh battery could power a home for about 6-8 hours, while a 100 kWh battery could last for 2-3 days.

For example, the Tesla Powerwall has a capacity of 13.5 kWh. That means it can power a home for about 12 hours at 1 kWh per hour. Most backup systems have batteries with comparable capacities so you can expect similar results in terms of how long your system will last. However, there are some smaller batteries with lower capacities that would only provide power for a few hours before needing to be recharged.


Charging Cycles

The average home backup battery can last anywhere from 2 to 5 years, depending on how often it is used and how well it is maintained. A home backup battery (lead acid) typically has a lifespan of a few hundred charging cycles but lithium batteries can last up to 2000 cycles.

When a home backup battery reaches the end of its charging cycles, it will no longer be able to hold a charge as effectively as it did when it was new. This reduced capacity will eventually lead to the battery being unable to power your home for as long as it did when it was new. If you

find that your home backup battery is not lasting as long as it used to, it may be time to replace it.


The efficiency of your inverter and connected load

Of course, actual runtime will also depend on other factors like the efficiency of your inverter to convert DC current to usable AC, how many appliances you’re running simultaneously, and the size of your power load. And if you’re running multiple appliances simultaneously, your power load will increase and your runtime will decrease. In general, however, an inverter with a high-efficiency rating will run your appliances more efficiently and save you money on your electricity bill.

Homeowners should always consult with an experienced installer to make sure their inverter is rated for their needs.


The conversion efficiency of AoHai Energy Storage Systems

AoHai home solar battery systems are able to achieve 98.7% conversion efficiency while maximizing return on investment (ROI) for users. The major reasons are:

  • AoHai’s unique battery pack design maximizes energy storage capacity and helps to improve conversion efficiency.
  • AoHai’s comprehensive system integration ensures a smooth, seamless experience for homeowners.
  • The company’s rigorous quality control ensures that each battery system is of the highest quality.

AoHai offers highly efficient energy storage systems that can help you exceed your competitors while striving in the solar business. We always look forward to establishing a long-term business relationship with you.

Just reach out to us and thrive your business!