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endur energy|SKU:ESP-5100 EMP

EndurEnergy ESP-5100 EMP — 48V LiFePO4 Server Rack Battery with EMP Hardening

EMP-Hardened 48V LiFePO4 for Grid-Independent Power

Experience unparalleled energy resilience with the world’s first EMP-hardened server rack battery. Engineered for the most demanding setups, this premium LiFePO4 solution delivers steadfast, clean power to safeguard your critical systems against any disruption. Elevate your energy independence with a battery built for uncompromising performance and lasting reliability.

EMP-hardened protection — First server rack battery shielded against electromagnetic pulse events
97% round-trip efficiency — Minimal energy loss through every charge and discharge cycle
90% usable capacity — Deep discharge without degrading your LiFePO4 cell chemistry
Four-tier safety certified — UL9540, UL1973, CEC, and SGIP compliance verified
  • FREE System Design Consultation -- Our engineers size your system for your actual consumption
  • FREE Shipping -- LTL freight on large systems — no surprise charges
  • Compatibility Guarantee -- Pre-vetted to work with your off-grid architecture

$2,281.95

Out of stock

In the box

  • EndurEnergy ESP-5100 EMP 48V 100AH LiFePO4 Server Rack Battery
Endur-LiFePO4-48v-Lithium-Battery-100AH-Server-Rack-Battery-UL9540-UL1973-CECSGIP
EndurEnergy ESP-5100 EMP — 48V LiFePO4 Server Rack Battery with EMP Hardening
$2,281.95

EMP-Hardened 48V LiFePO4 for Grid-Independent Power

The EndurEnergy ESP-5100 EMP is the first EMP-hardened server rack battery built for grid-independent systems. This 48V, 100AH LiFePO4 unit delivers 97% round-trip efficiency and a 90% recommended depth of discharge, giving you real usable capacity — not inflated specs on a datasheet. UL9540, UL1973, CEC, and SGIP certified, it's built-to-survive the conditions that take out lesser cells. Designed for standard server rack mounting, this field-tested unit fortifies your off-grid power backbone against electromagnetic threats, grid failures, and extreme temperatures from -10°C to 50°C.

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EMP Hardened Design
97% Round Trip Efficiency
90% Usable DoD
UL9540 & UL1973 Listed
48V
Nominal Voltage
100AH
Capacity
97%
Round Trip Efficiency
Endur-LiFePO4-48v-Lithium-Battery-100AH-Server-Rack-Battery-UL9540-UL1973-CECSGIP

Keep Your System Alive Through Anything

Most battery banks sit vulnerable — a single electromagnetic event or prolonged grid failure can take down your entire power architecture. The EndurEnergy ESP-5100 EMP changes that. As the first EMP-hardened server rack battery, it shields your 48V system against threats that disable standard lithium banks. At Off Grid Vault, every component we carry is vetted to work together — because we only sell systems we would install on our own cabins. This 100AH LiFePO4 unit integrates into your off-grid architecture with 97% round-trip efficiency, so when the grid goes dark for four days or longer, your power stays on.

Endur-LiFePO4-48v-Lithium-Battery-100AH-Server-Rack-Battery-UL9540-UL1973-CECSGIP

Deep Discharge Without Sacrificing Cell Life

The ESP-5100 EMP gives you 90% depth of discharge on LiFePO4 chemistry — meaning you access nearly the full 100AH capacity without accelerating degradation. At 48V nominal voltage, that is serious stored energy per cycle. Standard lead-acid banks at 50% DoD would need double the capacity to match this output. With a 97% round-trip efficiency rating, almost every watt your panels harvest actually reaches your loads. The charge temperature range spans 32°F to 113°F, and discharge operates down to 14°F — built-to-survive real conditions across the Southwest, Midwest, and Pacific Northwest.

Endur-LiFePO4-48v-Lithium-Battery-100AH-Server-Rack-Battery-UL9540-UL1973-CECSGIP

Certified for Systems That Actually Get Permitted

UL9540, UL1973, CEC, and SGIP certifications are not checkboxes — they are the difference between a battery bank your inspector signs off on and one that stalls your entire build. The ESP-5100 EMP carries all four, making it eligible for SGIP incentive programs in California and CEC-listed for grid-independent installations that require documented compliance. For homesteaders and cabin builders working with county inspectors or applying for state rebates, this battery removes the certification headache. Off Grid Vault stocks only certified, field-tested components because we know our customers are building permanent systems — not temporary setups.

Rack Compatibility

Standard server rack form factor for clean integration into your power cabinet.

  • 48V nominal system bus voltage required
  • Charge environment must stay within 0°C to 45°C
  • Discharge environment must stay within -10°C to 50°C

Engineered For

Where uninterrupted, hardened power is non-negotiable.

Off-Grid Homestead Battery Bank
Data Center UPS Backup
EMP-Resilient Solar Storage

Full specifications

At a glance

Power
48 V
Compliance
UL9540, UL1973, CEC, SGIP
Warranty
See product page
Full specifications12 data points across 4 categories

Dimensions

Form FactorServer Rack Battery

Power & Performance

Battery TypeLithium Iron Phosphate (LiFePO4)
ModelESP-5100/ ESP-5100 EMP
Nominal Voltage48 V
Capacity100 AH
Recommended DoD90%
Round Trip Efficiency97%
Charge Temperature Range32°F to 113°F (0°C to 45°C)
Discharge Temperature Range14°F to 122°F (-10°C to 50°C)

Materials

ConstructionSee product page

Compliance & Warranty

CertificationsUL9540, UL1973, CEC, SGIP
WarrantySee product page

The Off Grid Vault Promise

We stand behind every product we sell — because energy independence demands accountability.

Free ShippingShips free on all orders, including LTL freight. No thresholds, no fine print.
30-Day Performance GuaranteeIf it doesn't perform as specified, we make it right — uninstalled returns accepted within 30 days.
Free System Design ConsultationOur engineers size your system for your actual consumption — no guesswork, no incompatible components.
★★★★★
“I replaced two AGM banks with one of these ESP-5100 EMP units. The difference in usable capacity at 90% DoD is immediately noticeable — my fridge and well pump run through the night without the voltage sag I used to see. Having UL9540 and SGIP certs made permitting straightforward with my county. Off Grid Vault confirmed compatibility with my inverter before I ordered, which gave me confidence this wasn't going to be another expensive mistake.”
D
Derek L.Prescott, AZ

EndurEnergy ESP-5100 | LiFePO4 48V 100AH Server Rack Battery | UL9540, UL1973, CEC, SGIP

Price: $2,281.95

Introducing the EndurEnergy ESP-5100 LiFePO4 48V 100AH Server Rack Battery—the world’s first EMP-hardened energy storage solution engineered for mission-critical infrastructure. Designed to elevate your data center, telecom, or off-grid power system, this premium lithium battery delivers unmatched resilience against electromagnetic pulses (EMP) while providing a staggering 97% round-trip efficiency. With a robust 100AH capacity and a 90% recommended depth of discharge, the EndurEnergy ESP-5100 ensures your essential systems remain online when it matters most. Trust in the ultimate power backup that is certified to the highest safety standards, including UL9540 and UL1973, and approved for CEC and SGIP incentive programs.

Key Features

  • World’s First EMP-Hardened Battery: Fortify your critical systems against electromagnetic pulses (EMP) from solar flares or man-made events, ensuring operational continuity in the face of extreme threats.
  • Premium LiFePO4 Chemistry: Utilize advanced Lithium Iron Phosphate technology for superior thermal stability, a longer cycle life, and enhanced safety compared to traditional lead-acid or NMC batteries.
  • High Energy Density & Efficiency: With a 100AH capacity and an industry-leading 97% round-trip efficiency, you maximize every watt of stored energy, reducing waste and operational costs.
  • Deep Discharge Capability: Recommended 90% Depth of Discharge (DoD) allows you to utilize more of the battery’s stored power without compromising lifespan.
  • Wide Operating Temperature Range: Reliable performance in diverse environments, with charging from 32°F to 113°F and discharging from 14°F to 122°F.
  • Comprehensive Safety Certifications: Fully certified to UL9540, UL1973, CEC, and SGIP standards, guaranteeing compliance with the most rigorous North American safety and incentive requirements.
  • Server Rack Optimized Design: Standard 19-inch form factor integrates seamlessly into existing server racks, data centers, and solar battery storage systems.

Specifications

  • Model: ESP-5100 / ESP-5100 EMP
  • Battery Type: Lithium Iron Phosphate (LiFePO4)
  • Nominal Voltage: 48 V
  • Capacity: 100 AH
  • Recommended Depth of Discharge (DoD): 90%
  • Charge Temperature Range: 32°F to 113°F (0°C to 45°C)
  • Discharge Temperature Range: 14°F to 122°F (-10°C to 50°C)
  • Round Trip Efficiency: 97%
  • Certifications: UL9540, UL1973, CEC, SGIP
  • EMP Hardening: Yes (ESP-5100 EMP Model)

Why Choose EndurEnergy | LiFePO4 48v Lithium Battery | 100AH | Server Rack Battery | UL9540, UL1973, CEC, SGIP

When you invest in the EndurEnergy ESP-5100, you are not just buying a battery—you are securing the backbone of your power infrastructure. Unlike standard backup solutions, the EndurEnergy battery is the first of its kind to feature EMP hardening, offering unparalleled resilience against electromagnetic disruptions that can cripple conventional electronics. This is a critical advantage for data centers, telecom hubs, and government facilities where downtime is not an option.

Beyond its unique protective capabilities, this battery delivers premium performance. The high 90% Depth of Discharge means you can draw more usable power per cycle, while the 97% round-trip efficiency ensures you waste less energy during charging and discharging. Backed by the industry’s most respected certifications (UL9540, UL1973, CEC, and SGIP), the EndurEnergy battery qualifies for incentive programs and meets the strictest safety codes required for modern energy storage systems. Upgrade your resilience, reduce your operational risks, and ensure your critical systems remain powered with EndurEnergy—the ultimate choice for those who demand the highest standard in backup power. Elevate your power supply, elevate with Endur.

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Frequently Asked Questions

This server rack battery is shipped as a single unit. It is designed to fit standard 19-inch server racks. Assembly involves mounting the battery in your rack and connecting it to your system's bus bars or inverter. No complex wiring is required beyond standard battery connections. Always follow local electrical codes and consult a professional for installation.
Compatibility depends on your system's voltage and communication protocol. This battery operates at a nominal 48V and is designed for use with 48V off-grid or backup power systems. It supports a 90% depth of discharge and 97% round-trip efficiency. Check your inverter's voltage range and battery type settings to ensure proper integration.
This battery uses Lithium Iron Phosphate (LiFePO4) chemistry, known for safety and long cycle life. It has a nominal voltage of 48V, a capacity of 100AH, and a recommended depth of discharge of 90%. The round-trip efficiency is 97%. It is EMP hardened for added resilience against electromagnetic pulses.
LiFePO4 batteries require minimal maintenance. Keep the battery clean and dry, ensure proper ventilation within the rack, and periodically check connections for tightness. Avoid operating outside the charge temperature range (32°F to 113°F) or discharge range (14°F to 122°F). No watering or equalization is needed.
Returns are subject to the store's standard return policy. For support, contact our customer service team. This product carries certifications UL9540, UL1973, CEC, and SGIP, which may affect warranty or return eligibility. Always review the product documentation and warranty terms provided at purchase.
This battery is ideal for data centers, critical infrastructure, and high-reliability off-grid or backup power systems. It is designed for users who require robust, EMP-hardened energy storage with high depth of discharge and efficiency. It suits commercial and industrial applications where uninterrupted power is essential.
Yes, multiple Endur LiFePO4 48V 100AH batteries can be paralleled to increase total capacity. Ensure all batteries are of the same model and state of charge before connecting. The server rack form factor simplifies stacking. Consult the user manual for specific wiring and configuration guidelines.
This battery is certified to UL9540, UL1973, CEC, and SGIP. UL9540 ensures safe integration with energy storage systems, UL1973 covers stationary battery safety, CEC qualifies it for California Energy Commission incentives, and SGIP makes it eligible for Self-Generation Incentive Program rebates. These certifications confirm compliance with key safety and performance standards.
SKU: ESP-5100 EMP Categories: , Brand:

The Off Grid Vault Promise

We stand behind every product we sell — because energy independence demands accountability.

Free Shipping Ships free on all orders, including LTL freight. No thresholds, no fine print.
30-Day Performance Guarantee If it doesn't perform as specified, we make it right — uninstalled returns accepted within 30 days.
Free System Design Consultation Our engineers size your system for your actual consumption — no guesswork, no incompatible components.

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About endur energy Server Rack Batteries

endur energy is a trusted manufacturer of premium server rack batteries. OffGridVault is an authorized dealer offering the full endur energy lineup with free delivery, price match guarantee, and expert support.

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