Title
Fortress Power eVault MAX 18.5kWh Battery
Built to Last Whole-Home Power
The eVault MAX 18.5 kWh is Fortress Power’s most advanced 48V lithium iron phosphate (LFP) battery, delivering whole-home and light commercial energy storage in a compact, all-in-one design. Scalable up to 370 kWh, it’s ideal for applications ranging from off-grid living and backup power to solar self-consumption and peak demand reduction.
Engineered for simplicity and performance, the eVault MAX features AC and DC coupling options and a serviceable top-access design that makes installation faster and more reliable. Whether you’re powering a home, small business, or critical backup system, the eVault MAX offers the safety, capacity, and flexibility to get the job done.
Battery 20.3 x 20.3 x 42.2 in, 520lbs
We’re committed to building a cleaner, more resilient future—one product at a time. From choosing durable, second-life components to adopting low-impact packaging and environmentally responsible manufacturing, we’re rethinking every step of our process.
Our focus includes reducing waste, improving energy efficiency, and expanding access to off-grid solutions that empower our customers while protecting the environment.
Shipping & Returns
PickUp & Delivery
We recommend in-store pickup on St. John for the fastest service. Delivery is available to a designated pickup point in Red Hook, St. Thomas.
Returns
We cannot guarantee returns on all items. Please contact us to resolve any issues.
Shipping & Returns
PickUp & Delivery
We recommend in-store pickup on St. John for the fastest service. Delivery is available to a designated pickup point in Red Hook, St. Thomas.
Returns
We cannot guarantee returns on all items. Please contact us to resolve any issues.
Warranty
If you believe you have received a defective product, or are experiencing any problems with your product, please contact us.
Any warranty strictly does not cover damages that arose from negligence, misuse, wear and tear, or not in accordance with product instructions (dropping the product, etc.).
Warranty
If you believe you have received a defective product, or are experiencing any problems with your product, please contact us.
Any warranty strictly does not cover damages that arose from negligence, misuse, wear and tear, or not in accordance with product instructions (dropping the product, etc.).
Secure Payment
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
We accept payments with :
Visa, MasterCard, American Express, Paypal, Diners Club, Discover and more.
Secure Payment
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
We accept payments with :
Visa, MasterCard, American Express, Paypal, Diners Club, Discover and more.