How Long Will a 10kWh Home Battery Last During an Outage?

Nowadays, people are greatly relying on energy storage batteries to reduce the impact of power outages. In this growing world, we can’t deny the worth of electricity in our life. Whether it is your workplace or your home, you need to run a number of appliances on it.

However, when choosing a battery for your home, most of you get confused about its capacity that ideally suits your energy demands. Well, a 10kWh home battery is considered a standard-sized battery for average household power consumption.

Once the battery size is decided, the second worry is the duration of the battery, and how long it can last during blackouts. Typically, if your household consumes 1000 watts an hour, a 10kWh home battery can easily last for 10 to 12 hours. Moreover, after reading this article you’ll be there with better concepts about 10kWh home batteries.

So, let’s have a look!

What Can a 10 kWh Battery Power?

Whether you need a battery pack for commercial, residential, or emergency applications, a 10 kWh power will be perfect for you.

The 10 kWh battery pack has the ability to power your home for more than 8 hours as it produces 40kW of electricity per day. This simply means you can use this power source on a number of power appliances without any need to maintain the system.

Below is a list of appliances where you can use this 35-40 kWh of electricity on daily basis.

● Large 5+ bedroom home
● All lights
● Televisions
● Laptops
● Refrigerators
● Washer
● Dryer
● Central air conditioning
● Pool pump

Besides this, a 10 kWh power source can easily operate 9 large battery systems, 4 castors, and a spacious house. The best thing is the power source is rechargeable and safe for indoor use. In a residential area, it can act as a backup system and can lower your monthly bill by taking approximately 30% of the electricity load.

Moreover, the power produced by a 10 kWh battery depends on a number of factors and possess different voltage capacity. Here is a table showing the specs of a 10 kWh battery power.

DATA 12V 24V 36V 48V
Voltage 14.8 – 16.8V 25.9 – 29.4V 37 – 42V 48.1 – 54.6V
Current 676Ah 416Ah 260Ah 208Ah
Storage 10005Wh 10774kWh 9620kWh 10005kWh
Compatibility Single−phase/3-Ph Single−phase/3-Ph Single−phase/3-Ph Single−phase/3-Ph
Installation Indoor Indoor Indoor Indoor
Life Cycle 5,000 5,000 5,000 5,000
Charging 16.8V @ 10Ah 29.4V @ 10Ah 42V @ 10Ah 54.6V @ 10Ah
Dimensions V2.0 25.25″x 12.25″x 4.75″ 27″x 12.25″x 4.75″ 24.25″x 12.25″x 4.75″ 24.75″x 12.25″x 4.75″
Weight V2.0 94lbs 101lbs 96lbs 98lbs
Discharge Up to 1C Up to 1C Up to 1C Up to 1C

Is A 10kWh Battery Right for Your Home?

Before calculating the number of batteries needed to power your house or choosing any power source for your area, it is best to know the power consumption of your house. An average house uses 750 to 1000 watts per hour or 22 to 24 kWh per day which shows the power needs of a standard area.

How Long Will A 10kWh Home Battery Last

For your convenience, we have come up with some tips so you get to know if a 10 kWh battery is right for your home or not.

Power Consumption

Again, it depends on your power needs. For instance, if you own a spacious house containing a swimming pool and central air in it, then a 10 kWh battery is the best option for you.

However, if your house has minimum power needs or you don’t use high power consumption appliances, then a 5 kWh battery can also do the job successfully. Moreover, if you have an electric car in your house or planning to buy one, a 10 kWh should be on your power source list.

Electricity Needs

Depending on the energy usage and electricity needs of your house, you can decide whether a 10 kWh battery is perfect for your house or not. As far as a 10 kWh power source is concerned, it produces about 10,715 kWh of electricity per year.

Moreover, you can also save your power usage by lowering your utility bill. If you want to reduce your bill and make savings, then a 10 kWh battery might help you in doing so. Below are some factors on which your electric bill depends:

● The energy of your battery or solar panel
● Your electricity costs
● The net metering policy of your area

Number of Appliances

The number of connected appliances also determines whether a certain battery is perfect for your house or not. It highly affects the battery duration and charging capacity.

Thus, if you have more power-consumed appliances, you should go for a 10 kWh battery as it can perfectly handle large appliances at a time.

How Long Will A 10kWh Battery Last?

Once you’ve estimated the power consumption and battery needs of your house, it’s time to check the lifespan of your battery. Generally, a 10 kWh battery lasts for about 10 to 12 hours if the system uses 1000 watts per hour.

Moreover, the 10 kWh battery source comes with 10 years warranty so you can easily run them on your small and large house appliances or even in your electric car. Depending on your power use, the lifespan may increase or decrease accordingly.

Estimating the Runtime of a Battery

The runtime and capacity of a battery depend on its usage. How you use the battery and run your appliances will determine the lifespan of your power source. Thus, to estimate the runtime of a 10 kWh battery, the following steps apply

1- Using the Formula
For precise battery usage and power consumption needs, you should estimate your battery runtime effectively. For this, you can use the following general formula:

10 kWh / hourly wattage consumption = runtime

This means if your house appliance is running on a load of 1000 or 1500 watts per hour, then a 10 kWh battery can easily go for 6 or more hours. For this, simply divide the battery capacity by the number of watts and you’ll get the lifespan.

2- Type of Battery Used
The next step is to choose a battery type that fits your needs. Generally, two types of batteries are most commonly used, lead-acid batteries and lithium-ion batteries. Both have their own power capacity and dimensions.

To find the efficiency of a lead-acid battery, you can calculate it as 10kw x 2 x 1.1 = 22kwh. The 1.1 is the energy loss or inefficiency of the system.

Similarly, for lithium-ion batteries, the calculations would be 10kw x 1.1 x 1.07 = 11.7kwh which involves the depth discharge ratio, system inefficiency, and energy losses. Hence, by estimating the runtime, you can easily get to know the lifespan of your battery.

How to Calculate Your Home Battery Backup Needs?

Calculating your home battery backup needs is also one of the ways to determine how long will your 10kWh home battery last during an outage. The following are the parameters you may consider for this purpose;

● Find out your daily power usage
You may know the daily power usage of your home by checking your electricity meter or monthly bill. On your electricity bill, look for the kilowatt-hour usage. Now, in order to add up your daily power usage, divide the calculated kWh usage by 30 and finally multiply the answer by 1000.

Besides, you may also calculate the kilowatt-hour usage of individual electric devices you opt to use during an outage. The method is pretty simple, all you need is to individually find the wattage of every device. Generally, the kW is mentioned on the label present on the devices.

After determining the wattage, the next step is to estimate the number of hours you’re going to power the specific device. By multiplying the wattage by the number of hours you’ll come up with kilowatt-hour usage. Let’s consider you want to use a 100 Watt light bulb for 20 hours, the power usage will be, i.e, 100*20 = 2000Wh or 2kWh.

Hence, by following the same method, you may calculate the energy needs of every single electric device in your home. In the end, add up kWh usage of all the devices.

● Determining the Duration of Power Outage

You might be wondering, how many days or hours your 10kWh home battery can provide you power. Right?

Well, there is no justified answer to this question because it depends upon the situation you’ll be facing. Additionally, the number of appliances you want to use during power outages decides how long will your battery last.

Usually, a 10kWh battery would be enough to power your whole house appliances for a day. However, as you know some appliances consume huge power, such as AC and electric stoves. Therefore in case you are going to power such heavy devices, you’ll definitely need a home battery with double capacity.

That is why you are always suggested to calculate your power needs before buying a battery. Doing so will let you know whether a 10kWh battery is suitable for you or not.

On the other hand, if you have a solar system and you can recharge your 10kWh battery in the daylight during long power outages; it can surely last for several days.

What Are the Factors Affecting 10kWh Battery Performance?

In order to ensure the remarkable performance of your home batteries, you must consider the safety tips while its use. Yet, here are some factors that may affect the performance of a 10kWh battery.

The Load of Connected Devices

Overloading a battery by powering extra appliances than its total capacity may destroy the internal components of the 10kWh battery. Therefore, you should always power the devices according to the battery capacity.

Battery Maintenance

Some batteries require a proper check and balance while you are using them. For instance, a lead acid battery needs to be filled with water after a specific time, as soon as it dries. Additionally, you should never store the batteries uncharged for a longer time, as it may disturb the lifespan of a battery.

Related Article: How to Store Lithium-ion Batteries Safely When Not in Use


Normally most batteries are designed to resist specific temperatures only. The rise and fall of the temperature to some extent may affect the performance of batteries. If a deep cycle battery operates above 5 degrees temperature, there is a probability that the performance may deteriorate up to 30%.

Wear and Tear

Once the cycle life of the battery ends, with the passage of time it no longer has the capacity to hold the charge. In such conditions, the battery is said to be worn out. No, doubt it is natural so every battery has to experience it. Thus, when the battery wear and tears, it is time to replace it.

Use the Right Accessories

Using the right components is another factor that affects the performance of a 10kWh home battery. You must use the cables, connectors, and charger that come along with the battery. Using third-party components may lower the performance of your battery.


Usually, the batteries need ventilation for better functioning, especially, lead acid batteries. Hence, you should install them in an aerated area.

Other Factors

In addition to the above-discussed factors, a 10kWh battery may offer poor performance due to its round-trip efficiency. Plus, service loss and residual power during its use may be harmful to a battery.

Final Thoughts

Finally, you might have got a rough idea, of whether a 10kWh battery is sufficient for your household requirements or not. However, some of you might find it too much, while for others it might be just average. It all depends upon your energy preferences.

A house that needs to power one or more Air Conditioners must go for a larger battery, or you may use more than one 10kWh battery. Further, if you are looking to buy a new battery, you’re recommended to consult ETEKWARE batteries.

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