Many homes on the grid, not just those with off-grid energy solutions, need home battery backups to improve energy efficiency, save money, and to increase independence.
Homeowners (and businesses) around the country are increasingly turning to solutions in the form of advanced lithium home battery backups for their reliability, consistency, long-lasting performance, and overall power.
One of the premier options currently on the market is our EG4 indoor battery, many of the key features and selling points of which will be covered here.
High-Capacity Storage
The EG4 indoor battery is a high-capacity lithium battery that can store up to 16kWh of energy, which is roughly equivalent to the daily energy consumption of a small apartment. While it’s hard to run averages for numbers like this, considering everything it is a powerful lithium battery with a fairly high capacity; and several can be incorporated into one battery energy storage system for additional energy consumption requirements.
Stable Battery Chemistry
Modern lithium batteries are made with stable cathode materials that are resistant to overheating when overcharging as well as during discharge. In this case, the EG4 indoor battery features LiFePO4, or lithium iron phosphate chemistry, which is not only highly regarded for its energy density but for its stability, which in turn helps guarantee not just safety but longer service life.
BMS (Battery Management System) Protection
A battery management system, or BMS, is a must with a home battery backup system, especially as the complexity of the system grows, for several reasons.
One is safety. A battery management system will balance the load on each cell as the battery charges and discharges. This helps to prevent overheating that is not only a safety risk, but which can damage the battery’s cells.
In addition, a battery management system will monitor the state of charge of each cell as the battery discharges, ensuring that all cells discharge evenly, upholding greater reliability and power output consistency, while also protecting the battery to ensure a longer service lifespan.
Long Lifespan
You can take it for granted that lithium batteries will last longer than alternatives like lead-acid batteries, but in this case you can back that up with an official specification that the EG4 indoor battery is rated to last 8000 cycles, if not more, at 80% depth of discharge (DoD). The long lifespan of lithium batteries is one of the most important value-added features that helps to offset the high upfront cost.
Easy Monitoring
The EG4 indoor battery is equipped with an easy-to-read LCD screen that enables easy monitoring of battery health, state of charge, and more. It also provides for diagnostic capabilities.
Self-Heating Design
Extremely low temperatures can damage even those lithium batteries that are made with advanced chemistries, like LiFePO4 batteries, especially during charging and discharging cycles. The EG4 indoor battery is equipped with a self-heating feature that will keep the battery at an appropriate temperature during discharge to help prevent damage, improving power output consistency, overall performance, and safeguarding the battery’s lifespan.
E-Stop Function
The EG4 indoor battery is also safeguarded by an E-stop, or emergency stop, function that automatically cuts the power to the battery in the event of an emergency, protecting the battery and your home.
Easy, Space-Saving Installation
The EG4 indoor battery sports a design that is intended to be mounted to a wall. Not only is installation straightforward and easy, but it’s designed to save space in your home so you don’t need to allocate as much interior space to the battery backup system.
Maintenance-Free Design
Another great thing about the EG4 indoor battery is a feature that it shares in common with other lithium batteries. Compared to lead-acid alternatives, they require effectively no maintenance besides keeping them at an appropriate state of charge (and the BMS will help with that). Unlike lead-acid batteries, they will never need to be watered, and will need effectively no maintenance otherwise.
Additional Information
In addition to what’s already been covered here, the EG4 indoor battery boasts a UL-certified design as well as closed loop communication with all BigBattery APEX and EG4 inverters. It also ships from the United States and is covered by a 10 year warranty along with US-based support for the life of the battery.

Want to Learn More About the EG4 Indoor Battery?
The EG4 indoor battery is only one of the battery energy storage systems available here at BigBattery. For more information on the backup energy systems we carry, or if you have questions or need the help of a professional to configure a backup energy system for your home, get in touch with us directly. We’ll explore your unique use case and scenario and help you find a system that works well for you.