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Solar Batteries Vs. Battery Generators

solar battery backup vs battery generator

Many homeowners and businesses want emergency power during grid outages or the ability to have power at remote locations. Recent advances in battery technology are making solar batteries and battery generators more affordable and widespread, but both have their own unique pros and cons. We'll explore solar batteries vs. battery generators so you can help your clients find the best option for their needs, budget, and goals.


What is a Solar Battery?

Solar battery system combines solar panels with energy storage capabilities to provide backup power during outages or periods of low solar generation. This setup allows excess energy generated by the solar panels to be stored in batteries for later use when the sun is not shining or during power outages. Integrating solar batteries for homes and businesses reduces reliance on the grid and maximizes the use of renewable energy, promoting energy independence and environmental sustainability.


However, a solar battery can considerably increase the price of a solar energy system. Both the labor and equipment costs of adding a solar battery can be substantial. However, the federal solar tax credit can reduce the total cost of the system by 30%, and some states, such as California and Oregon, have solar battery rebates that lower the total system cost.


What is a Battery Generator?

A battery generator is a portable power device that stores electrical energy in rechargeable batteries. Unlike traditional generators that rely on combustion engines, battery generators use stored electricity to power various devices and appliances. They are typically silent, emit no fumes, and are suitable for indoor use. Battery generators are often charged via solar panels, wall outlets, or other renewable energy sources.


Advantages & Disadvantages of Solar Batteries

Solar battery backup systems provide energy independence, reduce reliance on the grid, and can lead to long-term cost savings, but they do have some drawbacks. They have a high upfront cost, their effectiveness depends on weather conditions, and they have limited energy storage capacity.


Pros of Solar Batteries

  • By using stored solar energy, households and businesses can reduce their dependence on grid electricity, promoting energy independence.

  • A solar panel battery allows your customers to store excess solar energy for later use, maximizing the use of renewable energy and promoting environmental sustainability.

  • With a solar battery pack, users can take advantage of time-of-use electricity rates, which offer electricity at lower prices during off-peak hours.

  • A solar battery energy storage system provides a reliable source of backup power during outages, promoting energy resilience and reducing the risk of disruptions to daily activities.

  • Many home and business owners can take advantage of the federal tax credit, which includes solar battery equipment and labor.

Cons of Solar Batteries

  • The installation of a solar battery system can be quite expensive due to the cost of batteries, inverters, and other equipment required, making it a significant upfront investment for households and businesses.

  • The effectiveness of a solar panel battery is dependent on local weather conditions. Low solar generation during prolonged periods of clouds and snow cover affects the system's ability to store sufficient energy.

  • Solar battery systems have limited energy storage capacity, making them suitable for essential appliances but not for powering an entire home or business for prolonged periods without grid electricity.

Advantages & Disadvantages of Battery Generators

Battery generators provide a range of benefits, such as portability, quiet operation, and the ability to store renewable energy. However, they also have limitations, including limited runtime, lower power capacity compared to fuel-based generators, and the need for recharging.


Pros of Battery Generators

A battery generator is a portable power station that stores electrical energy in rechargeable batteries, offering a silent and versatile solution for on-the-go or emergency power needs. In contrast, a backup or home generator typically relies on combustion engines fueled by gasoline, propane, or natural gas to provide continuous power during grid outages, offering higher capacities suitable for whole-home backup but with the trade-off of noise and emissions.


  • Many battery generators pair well with solar panels for backup power or other forms of renewable energy.

  • Battery generators are typically compact and portable, providing on-the-go power for camping, outdoor events, or emergency situations.

  • Many battery generators can be charged using renewable energy sources like solar panels for backup power, enhancing their sustainability and reducing reliance on the grid.

  • Unlike traditional generators, battery generators operate silently, making them suitable for indoor use and environments where noise is a concern.

  • They offer multiple output options, including AC outlets and USB ports, accommodating a variety of devices and appliances.

  • Battery generators do not produce emissions during operation, promoting a cleaner and more environmentally friendly power source.

  • They are user-friendly with simple controls, and some models feature mobile apps for remote monitoring and control.


Cons of Battery Generators

  • Portability can be a limitation, as the capacity of battery generators may be insufficient for extended power needs, making them less suitable for whole-home backup during prolonged outages.

  • While battery generators operate silently, their limited energy storage capacity may not sustain high-power appliances for an extended duration, affecting their usability in certain situations.

  • Despite their versatility, the cost of high-capacity battery generators can be relatively high, making them a significant upfront investment compared to traditional generators with similar power output.

  • While battery generators produce zero emissions during use, the environmental impact of manufacturing and disposing of batteries raises concerns, particularly regarding the extraction and processing of raw materials.

  • The ease of use is countered by the need for regular recharging, and if not adequately maintained, the battery's lifespan can be affected, potentially reducing the overall longevity and efficiency of the generator.

  • Although renewable energy integration is a positive feature, the reliance on solar panels for backup power or other renewable sources for charging means that their effectiveness is weather-dependent, impacting consistent power availability.

A Solar Battery Vs. Battery Generator

Whereas a battery generator may use solar electricity, a solar battery backup system is always connected to solar panels. A solar battery, such as the LG Chem RESU or Fortress Power eVault, integrates with a solar power system and stores energy. In contrast, a battery generator like the EcoFlow Delta Pro or Jackery Explorer is a portable power source that can be charged from various inputs, including solar panels, AC outlets, and car adapters.


Solar Battery

  • Power Source: Stores energy generated by solar panels during periods of sunlight.

  • Fuel Source: Relies on renewable energy from the sun, making it sustainable and environmentally friendly.

  • Installation: Integrated into a solar power system, typically mounted on or near a property.

  • Capacity: Scalable and can be designed to meet specific energy needs.

  • Automation: Can be set up for automatic operation, charging during sunlight hours and providing backup power when the grid fails.


Battery Generator

  • Power Source: Stores energy from the grid or external sources, often not directly tied to solar panels.

  • Fuel Source: Uses fossil fuels like gasoline, propane, or diesel or can be electrically charged from the grid or solar panels.

  • Installation: Portable and can be moved to various locations; no permanent installation is required.

  • Capacity: Limited compared to solar battery backup systems, suitable for specific appliances or short-term power needs.

  • Automation: Manual startup and connection to appliances, requires fueling or recharging.


The choice between a solar battery backup and a battery generator depends on factors such as sustainability, installation preferences, scalability, and the source of primary energy. Solar battery backups are more sustainable but require an initial investment in solar panels for backup power, while battery generators offer mobility and quicker deployment but may rely on fossil fuels.


What to Look for When Buying a Solar Battery

When selecting a solar PV battery, it's important to consider several factors to ensure optimum performance and cost-effectiveness.


  • Battery capacity and power rating: The battery's capacity and power rating determine how much energy it can store and how much power it can discharge. It's important to choose a battery that matches the energy storage needs and the power consumption of your client's home or business.

  • Battery type: Solar batteries are available in various types, including lithium-ion, lead-acid, and flow batteries. Each type of battery has its own benefits and drawbacks, and the best option depends on factors such as cost, capacity, and performance.

  • Battery lifespan and warranty: Solar batteries have a finite lifespan, and their performance declines over time. When buying a battery, it's essential to consider the manufacturer's warranty and its expected lifespan.

  • Charge and discharge efficiency: The efficiency of a solar battery determines how much energy is lost during the charging and discharging process. A highly efficient battery can help reduce energy losses and increase cost-effectiveness.

  • Battery Cost: Solar batteries are a significant upfront investment, and their cost varies depending on several factors, such as battery type, capacity, and manufacturer. When selecting a battery, it's important to consider the cost and long-term cost savings.

  • Battery warranty: Consider the warranty offered for the battery in the generator. A longer warranty period provides peace of mind and indicates the manufacturer's confidence in the product's durability and performance.

  • Stackability: Some solar batteries are designed to be stackable, allowing you to increase the power capacity by connecting multiple units together. If scalability is important to your client, look for a solar battery that is stackable.

What to Look for When Buying a Battery Generator

There are several important factors to consider when selecting a battery generator.


  • Power capacity: The battery generator's power capacity determines how much electricity it can provide. Assess your power needs and choose a generator with sufficient capacity to accommodate your devices and appliances.

  • Battery type and capacity: Different battery types have varying capacities and performance characteristics. Lithium-ion batteries are commonly used in battery generators due to their high energy density and longer lifespan. Consider the battery capacity to determine how long the generator can provide power.

  • Portability and size: Evaluate the weight, size, and portability of the battery generator, particularly if your client plans to use it for outdoor activities or in emergency situations. Look for compact and lightweight models that are easy to transport and store.

  • Charging options: Check for the battery generator's charging options. Many models allow charging through traditional AC outlets, car adapters, or solar panels. Multiple charging methods add flexibility and convenience.

  • Battery Runtime: Consider how long the battery generator can provide power before it needs to be recharged. Longer runtime is preferable, especially for situations where power outages or extended periods without access to electricity are anticipated.

  • Input and output ports: Look for a generator that offers a variety of input and output ports to accommodate your client's devices. Common output ports include AC outlets, USB ports, and DC ports for various appliances and electronics.

  • Battery generator safety features: Safety is crucial when using a battery generator. Look for generators with features like overload protection, short-circuit protection, and overcharge/over-discharge protection to prevent damage to the generator and connected devices.

  • Additional features: Consider any additional features that may be desirable, such as LED indicators, built-in lights, LCD screens for monitoring battery status, or mobile app compatibility for remote control and monitoring.


Best Battery Generator Recommendations

Battery generators, also known as portable power stations, offer portable and versatile power solutions for power outages or remote locations. These devices store electricity in rechargeable batteries and provide a convenient and silent alternative to traditional home generators.


They are often used for camping, outdoor activities, and emergency backup power, offering multiple output options for various devices and appliances. However, their capacity is generally lower than that of whole-home backup systems, but some can be connected to solar panels.


Popular battery generator options include the Goal Zero Yeti series, EcoFlow Delta series, Jackery Explorer series, Anker Powerhouse, Bluetti AC200P, and Renogy Lycan Powerbox.


Goal Zero Yeti Pro 4000 Portable Power Station

  • Best for: Home backup, RVs, and off-grid power needs.

  • Average cost: The Goal Zero Yeti Pro 4000 sells for $3,999.

  • Battery capacity: 4,000 watt-hours


Goal Zero offers portable power stations like the Yeti series, which are known for their versatility and reliability. These battery generators come in various capacities, often featuring multiple AC outlets, USB ports, and a variety of input options, including solar panels.


The Yeti Pro 4000 battery generator uses a LiFePO4 battery that can last for over 10 years with daily use. It has a design life of more than 4,000 life cycles and has expandable capacity.


EcoFlow Delta Pro Portable Power Station

  • Best for: home backup, RVs, and off-grid power needs.

  • Average cost: EcoFlow Delta Pro retails for $3,699.

  • Battery Capacity: 3,600 watt-hours


EcoFlow's Delta series includes powerful and portable battery generators. The Delta units are known for their high capacity, fast charging capabilities and a range of output options. They often incorporate features like a mobile app for remote control and monitoring.


This battery generator has a 3,500 life cycles and can power most home appliances other than air conditioners.


What is a Solar Generator?

A solar generator is a portable power station that harnesses energy from the sun using built-in solar panels or external solar panels for power. It stores this energy in a battery, providing a clean and sustainable power source for various devices and appliances. Solar generators are often used for camping, emergency backup, or remote power needs, offering an alternative to traditional generators.


Choosing Between Solar Battery Vs. Battery Generator

There are a few factors to consider when deciding between a solar battery pack and a battery generator. A solar battery is integrated with a solar power system and stores energy generated from solar panels. It can provide reliable and sustainable power during grid outages and can be recharged using solar energy.


On the other hand, a battery generator is a portable power source that can be charged from various sources, such as solar panels, AC outlets, or car adapters. It offers versatility and can be used both indoors and outdoors.


The best choice depends on your client's specific needs and circumstances – if they already have a solar power system or prioritize sustainable energy, a solar battery backup may be preferable. If portability and flexibility are more important, a battery generator may be a better option.


GreenLancer offers design and engineering for solar batteries and whole-house generators. Installers can sign up for free and shop an online catalog with fast turnaround, on-demand, standardized services.



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