Batteries vs. Generators for Home Power Backup

Batteries vs. Generators for Home Power Backup

If you live in an area prone to severe weather or frequent power outages, having a backup power source for your house is a smart idea. Although there are many different kinds of backup power systems available, they all have the same basic function of keeping your lights and appliances running when the power goes out.

Until recently, fears about the possibility of carbon monoxide poisoning caused the market for backup power supplies to be dominated by fuel-powered standby generators for houses, also known as whole-house generators. Alternatives to traditional generators that are more environmentally friendly and may be safer include battery backups.

The good news is that there are a wide range of backup power solutions available, including solar battery systems, propane, diesel, and natural gas-powered generators. The peace of mind that comes from knowing your family will function even if the grid goes down is yours when you locate the ideal option for your residence.

Batteries for Home Power Backup

For a variety of reasons, home battery storage systems have become increasingly popular in recent years. In addition to the obvious benefit of providing clean energy, increased people are becoming aware of the grid’s limitations. There can be many reasons why batteries should be installed at home. One of them is provided by Gerbrand Ceder, who serves as a distinguished professor at UC Berkeley and also at Lawrence Berkeley National Laboratory as the faculty staff scientist, is energy independence. According to which, the transfer of electricity happens between grid and the battery backup system in a smooth manner without being noticed.

Both solar energy and electricity from your utility can be used to charge these systems. Depending on use and unit size, backup power is provided for ten to twenty hours via grid charging. Even though you’ll only have so much electricity, if your outages are normally brief and sporadic, it could be plenty. As per the requirements, the battery can be recharged till the grid comes back on when used in conjunction with a solar panel setup. One thing to keep in mind, according to Ceder, is that without a battery storage system, a solar panel system would not provide you with electricity during a blackout. Due to the fact that the majority of panels powered via solar energy will turn off in the presence of power outages, during wires’ repairment, power isn’t routed into the wires.

Power for battery backups comes from the grid or your home’s solar power system. They are therefore far more environmentally friendly than generators that run on fuel. They’re also more cost-effective for you. Separately, you may utilize a battery backup system to reduce your energy costs if you have a time-of-use utility plan. Using the energy from your battery backup to power your house will save you from paying expensive electricity bills at times when demand is at its highest. You may use your power normally — and more affordably — at off-peak times.

Solar Panels and Batteries

The energy your solar panels generate may be stored for later use using solar batteries. The creation of a “hybrid solar system,” which combines solar batteries and panels, has several benefits, including utility independence and access to dependable backup power.

Solar batteries aren’t necessarily a part of every solar power system. In reality, just 4% of home solar installations included a battery backup in 2020, albeit that percentage is growing fast. Rather of storing solar energy locally, many solar power systems just deliver electricity into a house. The solar power system then “sells back” any surplus energy to the utility company via a link to the traditional electrical grid.

The Working of Solar Batteries

The extra energy generated by your solar panels is saved in the battery when your home doesn’t require it all. When the solar panels do not provide enough energy to meet the building’s demands, the battery dumps reserve power to compensate.

Lead acid, an earlier and cheaper form, and lithium ion, the currently most popular type of solar battery, are the two elements that are generally present in solar batteries that perform reaction  within the battery for storing and discharging power.

Solar panels generate the greatest power in the middle of the day, which is also when your home consumes the least amount of electricity. A typical grid-tied solar system sends the extra solar energy back to the power grid.

However, when solar panels and home batteries are used, the extra power is stored in the battery rather than being sent to the grid. You may then utilize the energy you’ve stored in your batteries in place of paying for power from the utility when the sun sets and your panels aren’t producing any more electricity.

Your solar battery system’s operation depends on how you set it up. You have three primary choices:

  1. Only use a solar battery system connected to your solar panels, often charging and discharging it to provide power at periods when the sun isn’t shining. This is helpful if you’re “off-grid” and far from any power facilities.
  2. Connect a solar battery pack and the grid to your solar panels. You can decide to charge your battery up to capacity and only use it sometimes to backup other sources of power, selling and purchasing extra electricity from the utility company the majority of the time.
  3. If you reside in a location where power prices change according on the hour of day, you may set up your system such that battery backup is used during the hours when the prices are on a higher side and electricity from the grid is purchased during the hours when the prices are on a lower side.

Batteries eventually lose their capacity to react quickly and store energy for later use. To increase your trust in how long these items will last, solar battery manufacturers frequently provide warranties or guarantees, although their lifespan might vary greatly based on several circumstances.

Types of Batteries

  • Lithium ion batteries

The most ecologically friendly alternative for backup power is lithium ion batteries. Because they can often link to smart home software systems, they have a long lifespan, maximize power use, save expenses, and provide homeowners greater control. Lithium ion batteries can be installed by owners behind an electricity meter, in a garage, or outside.

  • Lead acid batteries

Lead, water, and sulfuric acid undergo chemical reactions in a lead acid battery, a type of rechargeable battery, to store electrical energy. These batteries have been around for more than 160 years, but they are still widely used because of their durability, dependability, and affordability in both production and usage.

Benefits of Solar Batteries

The following are some of the major benefits of solar batteries.

  • Save the energy generated during the height of the day.
  • Avoid paying more when energy is most in demand.
  • Power your house all night long.
  • Avoid having power disruptions because to regular maintenance.
  • Stay powered during outages caused by natural disasters.
  • Control the energy you consume in your house.
  • Higher level of energy independence.
  • Reductions in your energy costs.

Generators for Home Power Backup

When the electricity goes out, standby generators for homes that are connected to the electrical grid in your home turn on automatically. In times of power outages, generators are powered by fuel, usually natural gas, liquid propane, or diesel. Other generators have the ability to run on either liquid propane or natural gas thanks to a feature known as “dual fuel.”

There is no need to manually replenish certain propane and natural gas generators because they may be connected to the propane or gas lines in your house. However, in order to continue operating, diesel generators will need to be topped off.

Larger, permanent generators and smaller, portable generators are the two categories into which generators for homes are often divided. Permanent generators are outside systems that can withstand the elements, similar to air conditioners. These generators are linked to a fuel source—such as propane or natural gas—that does not produce electricity. Permanent generators can be fitted with an automated transfer switch that will enable their power to start up automatically when the grid electricity cuts off, allowing them to run even when you aren’t home to turn them on. They are quieter than the alternative, smaller portable generator, but they still generate a substantial amount of noise. Permanent generators are somewhat costly due to their larger size and increased output.

The Need of Generators

For managing heavy loads or sustaining power for extended durations, a backup generator is the best option since it has a higher inrush current handling capacity. Generators must, however, be replaced nearly twice as frequently as lithium ion batteries. Additionally, generators are noisier than batteries.

The lights, refrigerator, and temperature of your home may all be maintained by generators. If you don’t have a solar-powered system, require plenty of energy for extended periods at home, and live close to a natural gas distribution line, a backup generator is a great option.

Types of Generators

Following are the some of the major types of generators.

  • Home standby generators

Home standby generators are installed permanently and activate automatically in the event of a power loss. These smart generators are made to kick on even in the event of a power outage, as well as to continuously do tests and self-diagnostics, so you will not be concerned about whether they’ll be ready for the next outage. Propane, which can be stored safely compared to regular gasoline, is used to power home standby generators.

  • Portable generators

Even though portable generators are smaller, they have a wide range of applications. These generators, which run on propane, gasoline, or solar energy, are less expensive than whole-house generators. Numerous little equipment and appliances may be powered by a portable generator, from tailgating and camping to working in a workshop. Each tool or appliance must be plugged into one of the outlets on the generator.

  • Solar generators

Clean, renewable solar energy powers solar generators for homes. There are no emissions, making it the only generator that can be utilized safely indoors. While more expensive to acquire, solar generators sometimes require little upkeep.In comparison to other generator kinds, solar generators produce less electricity. The solar generator for homes isn’t always dependable because it depends on the sun for electricity, making it unreliable in emergencies or at night. Extra solar panels may be added to the system to boost power production if more electricity is required. To boost power production and dependability, battery power is sometimes added to solar generators for homes.

  • Inverter generators

Compared to other generator types, an inverter generator operates differently. The inverter generator dynamically modifies its engine speed to satisfy the electrical demands instead of running at a fixed pace. As a result, both noise and fuel usage are significantly decreased. It is advised to use inverter generators to charge computers, tablets, and mobile phones since they provide clean energy. The inverter generator has a lower power source and won’t be able to operate major appliances, but it is a perfect alternative for travelling, camping, boating, etc. since electricity can also be saved in the inverter generator. However, you may combine the power of two inverter generators.

Benefits of Generators

The following are some of the major benefits of generators.

  • Automatic, quick, and efficient power distribution.
  • comfort in knowing that, in times of need, your family and house are protected.
  • uninterrupted usage of gadgets, appliances, and air conditioning and heating systems.
  • During storms and outages, comfort and security.
  • When electricity is restored, safety from harmful voltage peaks and surges is provided.
  • Significant increase in the home’s value.
  • Prevents thieves and burglars.
  • Lowers insurance.

Battery versus Generator

There are several factors to take into account when deciding what sort of backup power you require during a power outage or while using off-grid backup power. To decide if a backup power generator system, uninterruptible power supply, or battery is ideal for your house, you must first understand the benefits and drawbacks of emergency generators for homes or home battery backup systems for your home or workplace to sustain power supply until utility power is restored.

Additionally, you should think about whether you want to purchase a gas generator, diesel generator, air- or liquid-cooled, permanent backup generator, or a portable generator. Will a portable air-cooled generator suffice for all of your demands, or do you like to seamlessly convert to emergency battery power that is supplied by solar energy?

The comparison between a battery and a generator is provided below.


Depending on what you’re searching for, the price of home batteries and generators varies greatly. Currently, the cheapest portable generators are less costly than the cheapest residential batteries. However, fuel costs for generators are an ongoing, recurring expense. Home batteries need a power source investment as well, but with renewable energy sources like solar, this is only one investment that will provide years of cost-free, clean energy. Depending on the characteristics you choose, both house batteries and generators have additional prices.


In contrast to household batteries, this is the point at which generators truly suffer. Continuous refueling is necessary for generators. Large amounts of non-renewable fuel are used by generators, and this fuel needs to be stored in addition to the generator itself. Additionally, households using generators must store conditioning chemicals, all of which must be maintained outside and might be hazardous. In this area, battery backups for home are without a doubt the winner. They don’t emit any pollution, run independently, are silent, and don’t need continuing maintenance.

Expected Lifespan

The warranties on battery backups for houses are often longer than those for standby generators. These guarantees are evaluated differently, though. Like phones and computers, battery backup systems gradually lose their ability to retain a charge. As a result, battery backups have an end-of-warranty capacity rating that quantifies how well a battery will retain a charge after the warranty has expired. It is simpler to calculate lifespan for standby generators. If properly maintained, high-quality generators may run for 3,000 hours. As a result, your generator should last around 20 years if you use it 150 hours a year.


The fact that generators emit harmful exhaust is one of the factors requiring outside installation. Inadequate storage increases the risk of fire for generators and the fuel they use. Home batteries produce no pollutants, and while accidents can always occur when using them, they are less frequent because they don’t need gasoline or fuel storage.

Power Supply

Typically, generators provide a lower-quality energy current, prone to power spikes and other quality problems that can harm electronic devices like computers. They frequently require manual startup, which indicates a patchy power supply. Within milliseconds after a power failure, home batteries may be configured to offer a smooth backup power source. Batteries for homes are also less vulnerable to surges and outages. Standby generators surpass battery backups for houses in terms of the amount of time they can keep your home powered. Generators can operate constantly for as long as three weeks, provided you have adequate fuel.

Generac Power Cell with Battery and Generator

The Generac PWRcell is intended to be used every day in conjunction with solar panels in order to reduce your power costs. PWRcell stores extra electricity generated by your solar panels when there is more than is needed. You may utilize the energy stored in your battery at night or during periods when your panels aren’t able to supply your home with enough electricity, saving you from having to purchase it from the utility company.

Although PWRcell is designed to function with solar panels, a backup generator may also be utilized with it. You will still need solar panels to charge your PWRcell or use the power grid because it cannot be directly attached to the generator and is unable to charge from one.

The Final Verdict

Battery backup solutions for homes are the most popular in the majority of categories. Shortly put, they’re easier to install, more cost-effective to operate over the long haul, and better for the environment. In addition, their warranties are longer than those of standby generators.

To that end, conventional generators can occasionally be a wise choice. Since just one generator is required to restore electricity during a blackout, the initial expenses are lower than with battery backups for houses. Furthermore, standby generators have a longer session life than battery backup systems. So if the electricity goes out for days on end, they’ll be a better choice.

Besides, generators and batteries differ so greatly from one another that comparing them provides with the ease of opting one of them. Generators may probably be installed for a reasonable price if you don’t mind the noise, poor current quality, and non-renewable fuel they use. Home batteries, on the other hand, may provide you with reliable access to clean, renewable energy, and as demand for them grows, prices will continue to decrease.

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