Fortress Power eFLEX 5.4 kWh Lithium Iron Phosphate Battery - Green Vista Living
Fortress Power eFLEX 5.4 kWh Lithium Iron Phosphate Battery - Green Vista Living

Fortress Power eFLEX 5.4 kWh Lithium Iron Phosphate Battery

Authorized Fortress Power Dealer | Full Vendor Warranty Included

Customers rate us 4.6/5 based on 413 reviews.
$3,599.00
$4,599.00
$3,599.00
Save $1,000.00
Hurry! Only a few left in stock
Order in the next h min to get this to you between and

Need Help? Talk to our experts today!

Live Chat:
Bottom Right Text or Call us: 
513-743-2829
🚚
Shipping & Delivery Time Shipping timeline above is an estimate. Please live chat for precise ETAs and shipping costs.
🛡️
30-Day Return Guarantee
Check Policy
💲
Price Match Available
🏷️
Sales Tax Free! (Except OH, FL, CA)
🍃 SPRING SAVINGS SALE – LOWEST PRICES GUARANTEED 🍃
Spring prices are here! Shop now to grab the lowest prices of the season before the blowout ends.
Fortress Power eFLEX 5.4 kWh Lithium Iron Phosphate Battery - Green Vista Living

Fortress Power

Fortress Power eFLEX 5.4 kWh Lithium Iron Phosphate Battery

$4,599.00 $3,599.00
Fortress Power eFLEX 5.4 kWh Lithium Iron Phosphate Battery - Green Vista Living

Fortress Power

Fortress Power eFLEX 5.4 kWh Lithium Iron Phosphate Battery

$4,599.00 $3,599.00
  • Description
  • Why Buy From Us

Fortress Power eFLEX 5.4 kWh Lithium Iron Phosphate Battery

 

Fortress Power announces the eFlex 5.4 kWh scalable energy storage battery solution. The unit uses safe and high energy density prismatic Lithium-Iron-Phosphate cells. The battery has a built-in data storage and Wi-Fi for remote monitoring and troubleshooting ability. The smart relay-based Battery Management System (BMS), supports closed-loop communication with various 48V hybrid inverters on the market. Additionally, the BMS monitors and balances the voltage and temperature of each individual cell to maximize reliability and longevity. It has the highest round trip efficiency in the industry at 98%. This unit has wall mounting functionality and fits well into standard server racks for large systems.

High Durability and long-lasting: 10 Year Warranty with the safe and premium prismatic Lithium-Iron-Phosphate cells

Versatile Applications: Expandable up to 81 kWh for residential, commercial & industrial applications. Note that the minimum number of batteries depends on your inverter. Typically, a minimum of (3) batteries are recommended for home backup & off-grid applications.

Lowest Cost Per Cycle: High energy throughout with exceptional life span (6000+ cycles) and high round-trip efficiency (>99%)

Monitor from Anywhere: The battery has a built-in data storage Wi-Fi for remote monitoring and troubleshooting ability

Waterproof and saltwater resistant: The sleek-looking aluminum cabinet has IP65 waterproof rating to prevent salt-water corrosion

Specifications:

  • Total Energy: 5.376 kWh
  • Nominal Voltage: 51.2(48)V
  • Voltage Range: 45-58.4 V
  • Max. Charge Current(Continuous): 100 Amp / Recommended Charge Current: 55A
  • Max. Discharge Current(Continuous): 100 Amp / Recommended Continuous Discharge Rate: <68A
  • Recommend Storage temperature: 32 to 95 F
  • Charge temperature: 32 to 113 F
  • Capacity: 105 Amp-hour
  • Dimension(H x W x D): 7.2" x 17.5" x 21.5"
  • Weight: 116 lbs


Why Choose Green Vista Living


At Green Vista Living, we’re passionate about providing top-quality renewable energy and eco-friendly products that not only enhance your life but also help protect the planet. We’ve built our business with one mission in mind: to be the go-to destination for renewable energy solutions, outdoor gear, and off-grid supplies. When you shop with us, you’re not just getting innovative products—you’re joining a community that’s committed to sustainability.

We Put Our Customers First


As a small, dedicated team, we care deeply about your experience. Unlike large, faceless online companies, Green Vista Living offers a personal touch in everything we do. We're here for you from start to finish—whether you need product advice, support after a purchase, or just have questions. Our knowledgeable customer service team is always just a phone call or email away, ready to assist you in any way possible.

We Share Your Passion for the Planet


Our love for the outdoors and sustainable living runs deep. Most of our team hails from the mountains of Colorado, where renewable energy and the environment are part of daily life. So when you call Green Vista Living, you’ll speak directly with an expert who understands both the technical side of renewable products and the lifestyle they support. Whether you’re looking for solar generators, EV chargers, or any of our eco-friendly offerings, you can trust us to guide you with expertise and passion.

Trusted Industry Experts


Our close partnerships with the best brands in renewable energy and outdoor gear give us insider knowledge that you won’t find anywhere else. We’ve taken the time to carefully select products that stand out for their quality and reliability. At Green Vista Living, we believe in understanding our products inside and out so that we can help you make the right choice with confidence.

More Reasons to Love Green Vista Living


Price Match Guarantee: Thanks to our partnerships, we offer the best prices around. If you find a better deal, we’ll refund the difference.


Free Shipping: We offer free shipping on most orders to the lower 48 U.S. states, making your shopping experience even easier.


100% Secure Ordering: Our site uses SSL Encryption technology to keep your payment and personal information safe and secure.


Volume Discounts: For large orders, we’re happy to provide special pricing—just reach out for a custom quote.


Authorized Dealer: As an authorized dealer for all our brands, you’ll receive full manufacturer warranties with every order.


At Green Vista Living, we aim to make your renewable energy and outdoor experience as seamless and enjoyable as possible. With our unmatched customer service, expertise, and dedication to quality, you can shop with confidence, knowing you’re supporting a company that’s as committed to the planet as you are.

Frequently Asked Questions

Yes! We provide free and fast shipping on MOST orders within the continental United States. However, some specific brands and items will require a quote. You can live chat or call us for a quote
Most orders ship out within 1–2 business days and arrive within 3–5 business days depending on your location.
We offer easy returns as long as your item meets the conditions outlined in our Return Policy. Items must be unused, in original packaging, and returned within the specified return window.
Absolutely! Our in-house product experts are here to help. Live chat or call us 513-743-829 for personalized advice before or after your purchase.
Yes. All products include any applicable manufacturer warranties, and we’ll help you handle any warranty claims if needed.
Yes, we only sell 100% authentic, brand-new products, sourced directly from our manufacturers or authorized distributors.

Over 2,000+ Online Orders

4.64 ★ (413)
Verified
REAL REVIEWS, REAL RESULTS

Feedback From Our Customers

At Green Vista Living, we pride ourselves on delivering top-quality products and exceptional service to solar professionals and homeowners alike. Here's what our customers have to say about their experiences with us.

Kevin Leary
May 18, 2025
★★★★★

Incredible Tech Support from Anees of Green Vista Living. Exceptional service and went above and beyond on every question.

Bryan Cunningham
Off grid Kit • Dec 21, 2025
★★★★★

Shipment was slow due to high demand, but the team kept me informed and ensured everything arrived properly.

Related Products

Example product title
$3,599.00
$4,599.00
$3,599.00
Save $1,000.00
Example product title
$3,599.00
$4,599.00
$3,599.00
Save $1,000.00
Example product title
$3,599.00
$4,599.00
$3,599.00
Save $1,000.00
Example product title
$3,599.00
$4,599.00
$3,599.00
Save $1,000.00
Example product title
$3,599.00
$4,599.00
$3,599.00
Save $1,000.00
Example product title
$3,599.00
$4,599.00
$3,599.00
Save $1,000.00
Example product title
$3,599.00
$4,599.00
$3,599.00
Save $1,000.00
Example product title
$3,599.00
$4,599.00
$3,599.00
Save $1,000.00
Example product title
$3,599.00
$4,599.00
$3,599.00
Save $1,000.00
Example product title
$3,599.00
$4,599.00
$3,599.00
Save $1,000.00