Photo Credit: Renergy Solar, LLC

As more homeowners adopt solar + storage solutions, one question is becoming more important than ever: “How safe is the battery powering my home?”

Reliable backup power shouldn’t come with safety concerns, surprises, or uncertainty. At Fortress Power, keeping families safe is at the core of every engineering decision we make. From the chemistry inside our batteries to the protections built into each system, our commitment to safety goes far beyond industry requirements.

Built on Safer Chemistry: LiFePO₄ (LFP) You Can Trust

The foundation of battery safety starts with chemistry. While many home batteries rely on traditional lithium-ion chemistries, Fortress Power uses Lithium Iron Phosphate (LiFePO₄)—a chemistry known for its superior thermal and chemical stability. Here’s why LFP matters for home safety.

• Naturally non-combustible
  LiFePO₄ cells do not experience thermal runaway the way other lithium chemistries can.
• No cobalt or nickel
  Reduces environmental impact and eliminates common failure-risk metals.
• Highly stable under stress
  Performs safely during high temperatures, heavy loads, and rapid charge/discharge cycles.

This is the same chemistry trusted in hospitals, telecom systems, and critical infrastructure where safety is non-negotiable.

Engineered for Protection: Layers Safety From Cell to System

A battery is only as safe as its design. Fortress Power systems include multiple built-in safeguards to protect homes, installers, and equipment:

Advanced BMS (Battery Management System)

• Real-time temperature monitoring
• Cell-level balancing
• Over-current and over-voltage protection
• Internal short-circuit safeguards

Robust Enclosures & Certifications

Every Fortress Power product undergoes extensive safety testing and third-party certification, including:

• UL 9540 (system safety)
• UL 9540A (thermal runaway & fire propagation testing)
• UL 1973 (battery module safety)
• Compliance with NEC 2023 and NFPA 855

Reliable Performance in Harsh Conditions

Backup systems matter most when the grid doesn’t. Fortress Power batteries are built for reliable performance during:

• Severe cold (with integrated heaters)
• Extreme heat
• Long-duration outages
• High load demands
• Frequent cycling and heavy daily use

Cleaner, Safer Installs With Intelligent System Design

Safety doesn’t stop at the battery. Fortress Power designs complete system architecture that helps installers deliver secure, code-compliant installations. This includes:

• Clean cable management with eWay and eWay Lite
• Integrated Guardian Gateway for monitoring + rapid shutdown
• Quick-connect hardware to reduce wiring errors
• Clear spacing and mounting guidelines
• Remote diagnostics and firmware updates

Safety Backed by Industry-Leading Warranty Protection

A safe battery should come with strong long-term support. Fortress Power offers multiple warranty options depending on the product and system configuration.

10-Year Standard Warranty

Covers defects in materials and workmanship for:

• 48V batteries
• Hybrid inverters
• Residential and C&I storage solutions

This warranty ensures reliable baseline protection for the entire product family.

15-Year Extended Warranty for the eForce ESS

When installed as a complete system (battery + Envy inverter + Guardian Gateway), the eForce ESS is backed by:

• 15 years or 8,000 discharge cycles
• Rated at 80% DoD
• Full system-level coverage

This extended protection reflects the eForce’s long-term durability and robust LFP chemistry.

25-Year Extended Warranty Options

Certain Fortress Power 48V products qualify for extended 25-year coverage, offering homeowners and businesses maximum long-term peace of mind.

30-Year Limited Warranty via Solar Insure

Through our partnership with Solar Insure, customers can opt into a 30-year limited warranty including:

• Parts, labor, and travel
• Comprehensive performance protection

Transparent Monitoring with Guardian App

Safety requires visibility. The Guardian App provides:

• Real-time monitoring
• Automatic alerts
• Remote access for installers
• System diagnostics
• Performance reporting

A Safer Path to Clean Energy

Solar + storage should empower your home, never endanger it. Fortress Power remains committed to safety-first engineering, transparent system monitoring, and long-term reliability backed by strong warranties and rigorous testing. When you choose Fortress Power, you’re choosing:

• Safer battery chemistry
• Smarter engineering
• Dependable backup power
• Industry-leading protection
• A team dedicated to your energy security

Ready to Build a Safer Energy Storage System?

Our team is here to help you design a battery solution that protects your home and keeps your power secure, no matter what. Click here to get started and be sure to follow Fortress Power on Instagram & LinkedIn for more safety tips, installations, and product updates.