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Discover Energy Systems HELIOS ESS 16.1 kWh 51.2V LiFePO4 Outdoor Wallmount Battery Discover Energy Systems HELIOS ESS 16.1 kWh 51.2V LiFePO4 Outdoor Wallmount Battery $3,115.95
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eg4|SKU:1553005

EG4 48V 100Ah WallMount Indoor Lithium Battery — 5,120Wh LiFePO4 Storage with 6,000-Cycle Lifespan

Reliable Indoor LiFePO4 Storage for Your Off-Grid System

5,120Wh stored capacity — Powers essential appliances through extended outages
6,000+ cycle lifespan — Exceeds 15 years of daily deep cycling
Closed-loop EG4 communication — Battery BMS talks directly to your inverter
UL 1973 and UL 9540A — Fire safety certified for indoor wall mounting
Slim wall-mount design — Fits in garages and utility rooms
  • FREE System Design Consultation -- Our engineers size your system for your actual consumption
  • FREE Shipping -- Ships free, including LTL freight on large orders
  • Compatibility Guarantee -- Pre-vetted to work with your EG4 inverter

$1,456.95

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EG4 48V 100Ah WallMount Indoor Lithium Battery
EG4 48V 100Ah WallMount Indoor Lithium Battery
$1,456.95

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  • EG4 48V 100Ah WallMount Indoor Lithium Battery
EG4 48V 100Ah WallMount Indoor Lithium Battery
EG4 48V 100Ah WallMount Indoor Lithium Battery — 5,120Wh LiFePO4 Storage with 6,000-Cycle Lifespan
$1,456.95

Reliable Indoor LiFePO4 Storage for Your Off-Grid System

The EG4 WallMount Indoor 100Ah Lithium Battery delivers 5,120Wh of dependable storage for your off-grid system. Built for long-term reliability with over 6,000 deep cycles at 80% DOD, it keeps essential appliances running through extended outages. The slim, wall-mountable design fits cleanly in garages and utility rooms, while quick-connect Degson terminals streamline installation. Scale your grid-independent energy system as your needs grow — this battery integrates directly with EG4 6000XP, 3kW, 12kPV, 18kPV, and FlexBOSS21 inverters. UL 1973 and UL 9540A certified.

FREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORT
UL 1973 & UL 9540A Certified
5,120Wh LiFePO4 Capacity
6,000+ Cycles at 80% DOD
Quick-Connect Degson Terminals
5,120Wh
Usable Energy Capacity
6,000+
Deep Cycles at 80% DOD
>15 Years
Design Life
Your Battery Bank Speaks Your Inverter's Language

Your Battery Bank Speaks Your Inverter's Language

Grid-tied systems go dark the moment the utility fails — that defeats the entire point of investing in energy storage. The EG4 WallMount battery uses closed-loop communication to talk directly to your 48V EG4 inverter, so your system keeps running whether the grid is up or down. At Off Grid Vault, every battery we sell is pre-vetted to work with its matching inverter. No mix-and-match guesswork, no hoping the BMS protocol aligns. This battery was engineered to integrate with the EG4 6000XP, 3kW, 12kPV, 18kPV, and FlexBOSS21 — confirmed compatible, not assumed.

15 Years of Daily Deep Cycling Without Capacity Loss

15 Years of Daily Deep Cycling Without Capacity Loss

Most lithium-ion batteries degrade fast under daily use. This EG4 WallMount unit is built on LiFePO4 chemistry rated for over 6,000 deep cycles at 80% depth of discharge — that translates to a design life exceeding 15 years. At a 100A continuous charge and discharge rate, it handles real household loads: refrigerators, well pumps, lighting circuits, and communications equipment. UL 1973 and UL 9540A certifications confirm it meets strict fire safety standards for indoor installation. This is not a seasonal backup that degrades after a few discharge events. It is field-tested chemistry designed to hold capacity year after year in a grid-independent system.

Scale From One Battery to a Full Bank Without Rewiring

Scale From One Battery to a Full Bank Without Rewiring

Start with a single 5,120Wh unit and expand as your consumption grows. The EG4 WallMount supports parallel connections — add batteries over time using the EG4 paralleling kit with its included communication cable, and the bank operates as one unified system. Quick-connect Degson terminals and an optional conduit box keep the install clean and professional, whether you are mounting in a garage, utility room, or dedicated power closet. For inverters rated 12kW or higher, a minimum of three batteries is required for standard operation. Off Grid Vault includes a free system design consultation with every purchase so you start with the right bank size for your actual kWh daily consumption.

Compatibility Check

Confirm this battery works with your setup before you buy.

  • Indoor-rated installation location with wall-mount capability
  • Compatible with EG4 6000XP, EG4 3kW, 12kPV, 18kPV, and FlexBOSS21 inverters
  • Minimum 3 batteries required for inverters rated 12kW or higher

Built for Real-World Scenarios

Where this battery earns its place on your wall.

Homestead backup power during grid outages
Off-grid solar energy storage for daily cycles
Expandable battery bank scaling with your system

Full specifications

At a glance

Dimensions
See product page
Power
51.2V
Surface
See product page
Compliance
UL 1973 | UL 9540A
Full specifications8 data points across 4 categories

Dimensions

DimensionsSee product page

Power & Performance

Voltage51.2V
Capacity100Ah
Energy Capacity5,120Wh
Max Continuous Charge/Discharge100A
Design Life>15 years / 6,000+ deep cycles at 80% DOD

Materials

MaterialsSee product page

Compliance & Warranty

CertificationsUL 1973 | UL 9540A

The Off Grid Vault Promise

What you get when you buy from us — not just a product, but accountability.

Authorized DealerWe are an authorized EG4 dealer. Warranty claims go through us, not a ticket queue.
30-Day Performance GuaranteeIf it doesn't perform as specified, we make it right — uninstalled returns accepted within 30 days in original packaging.
Free System Design ConsultationOur engineers size your system for your actual consumption — no guesswork, no incompatible components.
★★★★★
“Mounted two of these in my utility room paired with the EG4 18kPV. Closed-loop communication was plug-and-play — the inverter recognized both batteries immediately. Ran my well pump, fridge, and shop lights through a three-day outage without touching a generator. Slim profile saved me a lot of wall space compared to the rack batteries I was considering. Solid build, no BMS errors after six months of daily cycling.”
F
First L.Prescott, AZ

EG4 WallMount Indoor 100Ah Lithium Battery | UL9540A, UL1973

The EG4 WallMount Indoor 100Ah Lithium Battery provides reliable power for both everyday energy needs and unexpected outages. With a 5,120Wh capacity and a 100A maximum continuous charge/discharge current, it’s ideal for backing up essential appliances, supporting off-grid living, or managing energy storage.

Designed for space efficiency, its sleek, wall-mountable form fits seamlessly in garages, utility rooms, or other indoor spaces. Plus, its expandable design allows you to scale your energy system as needed.

Compatible with the EG4 6000XP, EG4 3kW, 12kPV, 18kPV, and FlexBOSS21, this battery ensures optimal performance for your solar setup.

Inverters with 12kW or higher capacity require at least three batteries for standard operation

To connect multiple EG4 WallMount Indoor 100Ah Lithium Batteries in parallel, a paralleling kit must be purchased from the distributor. Use the battery-to-battery communication cable included in the kit to link the batteries together for seamless operation.


EG4 WallMount Indoor 100Ah Lithium Battery

EG4 100Ah WallMount Battery Specs & Features

  • Voltage: 51.2V
  • Capacity: 100Ah
  • Design Life: >15 years / 6,000+ deep cycles at 80% DOD
  • Certifications: UL 1973 | UL 9540A
  • Built to Last: Provides over 6,000 cycles at 0.5C and 80% Depth of Discharge (DOD) for long-term reliability.
  • Reliable Backup Power: Efficiently stores energy to keep essential systems running during outages.
  • Compact & Space-Saving: Slim, wall-mountable design fits seamlessly in indoor spaces without sacrificing performance.
  • Hassle-Free Installation: Features quick-connect Degson terminals and an optional conduit box for a clean, professional setup.
  • Seamless Compatibility: Closed-loop communication ensures smooth integration with any 48V EG4 Electronics inverter.


Your Satisfaction with EG4 is Guaranteed:

  • 10-Year Limited Warranty
  • Lowest Price Guarantee

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Frequently Asked Questions

At $1,457 for 5,120Wh of LiFePO4 storage rated for 6,000+ cycles, the cost per kWh over the battery's life is what matters. This is not a disposable unit you replace every few years — it holds usable capacity through over a decade of daily deep cycling. When you factor in rising utility rates and the cost of grid outages, the value compounds. Pair it with solar and a compatible EG4 inverter, and each cycle is energy you produced and stored yourself, not power you are renting from the utility.
Off Grid Vault is an authorized EG4 dealer. That means your warranty claim goes through us — not through a support ticket queue with no accountability. We verify that every battery we ship carries valid UL 1973 and UL 9540A certifications. We also provide a free system design consultation so this battery is correctly specced for your inverter, your load profile, and your expansion plans. No box of random components — a battery matched to a system architecture by people who understand off-grid power.
This battery uses closed-loop communication and is confirmed compatible with the EG4 6000XP, EG4 3kW, 12kPV, 18kPV, and FlexBOSS21 inverters. If your inverter is rated 12kW or higher, a minimum of three batteries is required for standard operation. For parallel battery banks, the EG4 paralleling kit must be purchased separately — it includes the battery-to-battery communication cable needed for multi-battery setups. Not sure which inverter matches your home or cabin? Our free system design consultation sizes the full configuration to your daily kWh consumption.
EG4 rates this battery at over 6,000 deep cycles at 80% depth of discharge and 0.5C rate — that is the spec under real operating conditions, not a theoretical maximum. At one full cycle per day, that exceeds 15 years of usable life before the battery reaches the end of its rated cycle count. LiFePO4 chemistry holds capacity far better than standard lithium-ion under repeated deep discharge. UL 1973 and UL 9540A certifications confirm it passed thermal runaway and fire safety testing for indoor installation.
Yes. The EG4 WallMount supports parallel expansion. When you are ready to scale, you purchase the EG4 paralleling kit separately — it includes the battery-to-battery communication cable that links multiple units into one coordinated bank. Start with a single 5,120Wh battery for lighter loads, then add capacity as your system grows. Keep in mind that EG4 inverters rated 12kW and above require a minimum of three batteries. If you plan to upgrade your inverter down the line, our free system design consultation helps you plan the right bank size from the start.
The EG4 WallMount is designed for straightforward mounting. Quick-connect Degson terminals let you wire the battery without specialized tools. An optional conduit box is available for a cleaner, code-compliant installation in utility rooms or garages. The slim form factor mounts directly to the wall and fits in tight indoor spaces. That said, this is a 51.2V lithium battery — if you are not comfortable with DC wiring, our free system design consultation includes guidance on safe installation practices and can connect you with qualified installers in your area.
SKU: 1553005 Category: Brand:

The Off Grid Vault Promise

What you get when you buy from us — not just a product, but accountability.

Authorized Dealer We are an authorized EG4 dealer. Warranty claims go through us, not a ticket queue.
30-Day Performance Guarantee If it doesn't perform as specified, we make it right — uninstalled returns accepted within 30 days in original packaging.
Free System Design Consultation Our engineers size your system for your actual consumption — no guesswork, no incompatible components.

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About eg4 Wall Mount Batteries

eg4 is a trusted manufacturer of premium wall mount batteries. OffGridVault is an authorized dealer offering the full eg4 lineup with free delivery, price match guarantee, and expert support.

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