Complete DIY Home Solar Kits — Battery + Inverter for Grid or Off-Grid

Featuring Fortress Power solutions

Energy Storage Batteries, Inverters & Spare Parts

A trusted source for energy storage equipment, replacement parts, and accessories for system owners and installers.

Shop Batteries

Shop Spare Parts

New Product
New Installation!

Our eBoost Battery &
Envy Duo 21 Hybrid Inverter
are now arriving at customer sites and
being successfully installed
—bringing reliable power to life.

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BUNDLE & MAXIMIZE PERFORMANCE

Receive a Free Guardian Gateway when you purchase an eForce + Envy Inverter

Plus, 15-year battery warranty and VPP participation — now through March 31, 2026.

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SEAMLESS POWER FOR MODERN LIVING

Backed by 15 Years of Trusted Performance

Enjoy peace of mind with an industry-leading, 15-year warranty, ensuring your battery delivers reliable power for years to come.

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Shop by Category

Find exactly what you need—fast. Explore our selection of energy storage batteries, solar inverters, spare parts, and system accessories designed for reliable power systems.

48V Solar Energy Storage Batteries

Off-Grid & Hybrid Inverters

Solar Accessories & Components

Replacement Parts

Brand Merchandise

Your First Off-Grid Setup for Tiny Homes & Cabins

Start your off-grid journey with our starter system

Fortress Power Solo 6.5K Off-Grid Inverter | All-in-One | 48V ~~$1,649.00~~ $1,549.00

Fortress Power eFlex Max 5.4kWh Small Solar Battery

Fortress Power eFlex MAX 5.4kWh Lithium Solar Battery ~~$1,899.00~~ From $1,449.00

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Need More Power for Larger Homes or Backup Needs?

High-capacity batteries and hybrid inverters designed to keep more appliances running with extended solar backup.

Fortress Power Envy Duo 21 48V Hybrid Solar Inverter – 16kW High-Power Output for Home & Small Business ~~$5,398.00~~ $5,065.00

Fortress Power eBoost 16kWh Solar Battery + eWay Conduit Box with 750A Busbars for Paralleling | 48V 314Ah | DIY-Friendly Home Backup | UL9540A From $3,445.00

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Full-Home Power, Built to Last

The premium solution for full-home power or serious backup — build it once and enjoy years of worry-free energy.

Fortress Power eForce Stackable 9.6kWh-28.8kWh LFP Battery From $3,645.00

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Fortress Power Envy True 12kW Hybrid Solar Inverter ~~$5,199.00~~ $4,898.00

Customize & Connect Your System

Optimize your energy setup with essential system accessories, including battery cabinets, mounting racks, and communication gateways to monitor and expand your power system.

Guardian Gateway for Fortess Power Batteries Monitoring

Fortress Power Guardian Gateway – Remote Monitoring for 48V Battery Systems $529.00

Fortress Power DuraRack Enclosure for eFlex Max batteries.

Fortress Power DuraRack Indoor/Outdoor Enclosure for eFlex 5.4kWh Batteries $1,485.00

Fortress DuraRack Mini enclosure to store eFlex Max batteries

Fortress Power DuraRack Mini Enclosure for eFlex Max 5.4kWh Batteries $609.00

Maintain & Upgrade with Confidence

Keep your energy system running at peak performance with genuine spare parts and replacement components.

Gear Up & Celebrate Energy Innovation

Keep your team and yourself geared up with brand merchandise—celebrate your energy setup in style.

Why Shop with EcoVault

We’re not just another online store. Here’s what makes us different.

⭐ Proven Performance

Designed for both homeowners and professional installers, our energy storage products provide reliable and proven solutions.

🔋 Genuine Spare Parts

Ensure your system runs smoothly with compatible, original replacement parts.

✅ Technical Support

Expert guidance to help you choose, install, and maintain your system.

📦 Reliable Shipping

Orders ship quickly from U.S. warehouses with careful packaging and tracking updates.

What Our Customers Are Saying

Real feedback from real people—see why DIYers and off-grid homeowners trust EcoVault for their energy projects.

“The kit came with everything I needed.”

Super easy to install, and the support team walked me through the wiring questions I had. I’ll definitely be ordering again.

Mike B., Arizona

“Best experience I’ve had buying solar gear online.”

Fast shipping, great packaging, and it actually worked out of the box. No surprises.

Danielle T., North Carolina

“Straightforward, no fluff.”

I used the design tool, ordered a kit, and had power in my off-grid cabin in under a week.

Ron K., Montana