Fortress Envy 12kW Inverter with 4 eFlex G2 5.4kWh Batteries and Durarack Bundle
- Authorized Dealer – We’re officially authorized to sell every brand on our site. That means genuine products and full manufacturer warranties—no exceptions.
- Free Shipping – Get fast and free shipping on every order, anywhere in the continental U.S.
- Top-Rated Customer Support – Need help? Our friendly, U.S.-based team is here to support you before and after your purchase.
Guaranteed Secure Checkout
This bundle comes with 12kW inverter, 4 eFlex 5.4 kWh batteries and durarack.
Fortress Power Envy True 12 kW Inverter:
- Comprehensive Integration: Functions seamlessly for PV, Generator, On/Off Grid, AC/DC Coupling.
- Full Home Backup: Supports 200A AC Passthrough ensuring complete home backup.
- High Capacity: Allows for a maximum of 18 kW PV power delivery to both the battery and AC outputs, with 12 kW (50A @240V) backup power.
- Efficient Installation: Features integrated AC & DC breakers for swift installation and commissioning.
- Enhanced Safety Features: Built-in APsmart Rapid Shutdown Transmitter and Button ensure safety compliance.
Key Features of Envy True 12 kW Inverter:
- Supports 200A AC passthrough for whole home backup.
- Triple MPPT output catering to a maximum 21 kW PV array.
- Flexibility with AC, DC, and AC/DC coupling.
- Robust IP65 rating suitable for both indoor and outdoor installations.
- Integrated generator input.
- Scalability up to 10 units in parallel.
- Comprehensive monitoring capabilities through local and remote apps.
- User-friendly interface with a color LCD touch screen and batch settings.
Fortress Power eFlex 5.4 kWh Lithium Batteries:
Designed to withstand diverse applications and extreme weather conditions:
- Utilizes Tier 1 Automotive Prismatic Lithium Iron Phosphate Cells ensuring longevity.
- Innovative enclosure design offering superior thermal performance compared to competitors.
- Robust IP65 Dust and Water-Resistant design suitable for outdoor setups.
- Versatile mounting choices including wall mount, floor-stand, or standard 19” industrial server rack mount.
DuraRack for Fortress eFlex 5.4 kWh Lithium Batteries:
- Versatile Storage Solution: Accommodates up to 4 eFlex 5.4kWh batteries, facilitating a 48V UPS server rack or augmenting home solar arrays.
- Robust Enclosure: NEMA 3R rated for resistance against water and dust, ensuring durability for both indoor and outdoor installations.
- Integrated Features: Comes with integrated busbars and battery cables simplifying stacking.
- Climate Adaptability: Easily add a DIN rail thermostat for colder environments, complemented by passive cooling vents for warmer climates.
- Scalable Storage: Expands effortlessly up to 4 units, accommodating a total of 81 kWh when equipped with 15 eFlex batteries.
Document Library
Fortress eFLEX 5.4kWh Data Sheet
Fortress Power eFLEX Installation Manual
Fortress eFlex UL9540 Certificate
Fortress - Online Inverter Integration Guides
Envy Inverter 12 kW Specifications
Envy Inverter 12 kW Install Manual
Envy Battery-inverter Integrations guide
Envy inverter Monitoring setup guide
Fortress Power DuraRack Data Sheet
Fortress Power DuraRack Install Manual
Shipping Information
FREE & FAST SHIPPING SAVE Hundreds Today with Free Shipping on All Orders. We Ship to ALL 48 Lower States (We do not ship to Puerto Rico, Hawaii, Alaska)
Lead Time - 3-7 Business Days Depending on Product - Once You Place an Order, We immediately begin processing, the order request is sent to our warehouse and is prepared for pickup, it then usually takes around 3-7 business days to be picked up for transit.
Transit Time - Transit Time can vary depending on the distance between your location and the warehouse but you can expect the item to arrive between 3-8 business days after pickup.
Our Shipping Partners: FedEx, UPS, Freight Club (among others)
We partner with the most reliable freight companies in the USA to ensure your order arrives safe and in a timely manner.
Your Item will ship from warehouses all across the United States to ensure fast and efficient delivery times for our customers.
If there are any delays regarding your product shipment, we will let you know in advance. .png)
.png)
Order Confirmation:
As soon as you place your order, you will receive an order confirmation e-mail. (please allow a few hours for this to come through in some cases) This means that we have received your order in our system and pre-authorized your credit card for the purchase.
As soon as we receive your order, we automatically reach out to our suppliers to confirm that it is in stock and available for immediate shipment.
If your item is on backorder or unavailable, we will void the pre-authorization and reach out to you via e-mail. If your item(s) are available for immediate shipment (within 5 business days), we will process the charges and submit the order for shipment.
Order Shipment:
If your order is in stock and we process the charges to your credit card, it will ship within five business days from the date of your order. We will send you tracking information within 24 hours of your order leaving the warehouse to the e-mail address you provided when checking out. If you do not receive tracking information from us within six business days of your order, feel free to follow up with us at sales@buildthepower.com
No Shipping outside the USA. (Some exceptions apply - if the website permits you to check out and enter your shipping address, you will receive your order. Some products in particular are available in Canada).
Shipping Options
Our base "Curb-side" Pickup shipping is always completely free! This option usually takes between 5-15 days to arrive at your doorstep, after you have submitted your order.
Threshold Shipping: This involves the item being brought onto your porch, or into a sheltered/garage area.
Double-Check Your Address
To ensure that your package is properly delivered and that you receive your package within the time frames we advertise, please
make sure that your address is correctly entered and includes all relevant and/or required information. The use of correct
abbreviations, street numbers, building or apartment numbers, and route information (if applicable) is critical for ensuring
timely delivery. We do not take responsibility for lost, misplaced, or incorrectly delivered shipments if the address information
provided is incorrect or incorrectly entered at the time of purchase.
Damages
Please inspect the packaging of your item(s) when they arrive, if you notice any damage, you should make note of it when signing for delivery. If your item(s) do arrived damaged please send photos of damage, box and SKU, along with a brief description of the damage to sales@buildthepower.com and we will process an insurance claim on your behalf. Photos and videos must be sent for freight damage within 24 hours of arrival or the freight damage claim will not be valid. Any punctures, or visible signs of exterior damage must be reported within 24 hours.
Warranty
10 Years
Return Information
We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.
Should you decide to cancel your order prior to its shipment, a 3% deduction will be applied to cover platform fee expenses from the total paid amount.
To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase. Items that are not in this condition will not be accepted.
To start a return, you can contact us at sales@buildthepower.com If your return is accepted, we'll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.
Returns for reasons other than damaged items will require a 15-25% re-stocking fee, this depends on the size and freight cost of the item to ship back, we sell large items and shipping can be costly.
Returns/Cancellations after the item has shipped will also incur a 15-25% fee charged to you, as freight costs can be high for our products.
If your return is outside of the 30 day return period, your item will not be accepted.
You can always contact us for any return questions at sales@buildthepower.com.
Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item so that we can evaluate the issue and make it right.
Items that are damaged must be communicated to us within 24 hours of receiving the item.
Please note that if items have been taken out of the packaging and/or installed, returns may be voided depending on the manufacturer.
Some of our manufacturers do not accept returns for specific items, this must be considered when purchasing.
Exchanges
The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.
Refunds
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method. Please remember it can take some time for your bank or credit card company to process and post the refund too.
You can contact us using the methods below.
US Customer Support Number: +1 507 636 3614
Email: sales@buildthepower.com
Description
This bundle comes with 12kW inverter, 4 eFlex 5.4 kWh batteries and durarack.
Fortress Power Envy True 12 kW Inverter:
- Comprehensive Integration: Functions seamlessly for PV, Generator, On/Off Grid, AC/DC Coupling.
- Full Home Backup: Supports 200A AC Passthrough ensuring complete home backup.
- High Capacity: Allows for a maximum of 18 kW PV power delivery to both the battery and AC outputs, with 12 kW (50A @240V) backup power.
- Efficient Installation: Features integrated AC & DC breakers for swift installation and commissioning.
- Enhanced Safety Features: Built-in APsmart Rapid Shutdown Transmitter and Button ensure safety compliance.
Key Features of Envy True 12 kW Inverter:
- Supports 200A AC passthrough for whole home backup.
- Triple MPPT output catering to a maximum 21 kW PV array.
- Flexibility with AC, DC, and AC/DC coupling.
- Robust IP65 rating suitable for both indoor and outdoor installations.
- Integrated generator input.
- Scalability up to 10 units in parallel.
- Comprehensive monitoring capabilities through local and remote apps.
- User-friendly interface with a color LCD touch screen and batch settings.
Fortress Power eFlex 5.4 kWh Lithium Batteries:
Designed to withstand diverse applications and extreme weather conditions:
- Utilizes Tier 1 Automotive Prismatic Lithium Iron Phosphate Cells ensuring longevity.
- Innovative enclosure design offering superior thermal performance compared to competitors.
- Robust IP65 Dust and Water-Resistant design suitable for outdoor setups.
- Versatile mounting choices including wall mount, floor-stand, or standard 19” industrial server rack mount.
DuraRack for Fortress eFlex 5.4 kWh Lithium Batteries:
- Versatile Storage Solution: Accommodates up to 4 eFlex 5.4kWh batteries, facilitating a 48V UPS server rack or augmenting home solar arrays.
- Robust Enclosure: NEMA 3R rated for resistance against water and dust, ensuring durability for both indoor and outdoor installations.
- Integrated Features: Comes with integrated busbars and battery cables simplifying stacking.
- Climate Adaptability: Easily add a DIN rail thermostat for colder environments, complemented by passive cooling vents for warmer climates.
- Scalable Storage: Expands effortlessly up to 4 units, accommodating a total of 81 kWh when equipped with 15 eFlex batteries.
Document Library
Fortress eFLEX 5.4kWh Data Sheet
Fortress Power eFLEX Installation Manual
Fortress eFlex UL9540 Certificate
Fortress - Online Inverter Integration Guides
Envy Inverter 12 kW Specifications
Envy Inverter 12 kW Install Manual
Envy Battery-inverter Integrations guide
Envy inverter Monitoring setup guide
Fortress Power DuraRack Data Sheet
Fortress Power DuraRack Install Manual
Shipping Information
FREE & FAST SHIPPING SAVE Hundreds Today with Free Shipping on All Orders. We Ship to ALL 48 Lower States (We do not ship to Puerto Rico, Hawaii, Alaska)
Lead Time - 3-7 Business Days Depending on Product - Once You Place an Order, We immediately begin processing, the order request is sent to our warehouse and is prepared for pickup, it then usually takes around 3-7 business days to be picked up for transit.
Transit Time - Transit Time can vary depending on the distance between your location and the warehouse but you can expect the item to arrive between 3-8 business days after pickup.
Our Shipping Partners: FedEx, UPS, Freight Club (among others)
We partner with the most reliable freight companies in the USA to ensure your order arrives safe and in a timely manner.
Your Item will ship from warehouses all across the United States to ensure fast and efficient delivery times for our customers.
If there are any delays regarding your product shipment, we will let you know in advance.
Order Confirmation:
As soon as you place your order, you will receive an order confirmation e-mail. (please allow a few hours for this to come through in some cases) This means that we have received your order in our system and pre-authorized your credit card for the purchase.
As soon as we receive your order, we automatically reach out to our suppliers to confirm that it is in stock and available for immediate shipment.
If your item is on backorder or unavailable, we will void the pre-authorization and reach out to you via e-mail. If your item(s) are available for immediate shipment (within 5 business days), we will process the charges and submit the order for shipment.
Order Shipment:
If your order is in stock and we process the charges to your credit card, it will ship within five business days from the date of your order. We will send you tracking information within 24 hours of your order leaving the warehouse to the e-mail address you provided when checking out. If you do not receive tracking information from us within six business days of your order, feel free to follow up with us at sales@buildthepower.com
No Shipping outside the USA. (Some exceptions apply - if the website permits you to check out and enter your shipping address, you will receive your order. Some products in particular are available in Canada).
Shipping Options
Our base "Curb-side" Pickup shipping is always completely free! This option usually takes between 5-15 days to arrive at your doorstep, after you have submitted your order.
Threshold Shipping: This involves the item being brought onto your porch, or into a sheltered/garage area.
Double-Check Your Address
To ensure that your package is properly delivered and that you receive your package within the time frames we advertise, please
make sure that your address is correctly entered and includes all relevant and/or required information. The use of correct
abbreviations, street numbers, building or apartment numbers, and route information (if applicable) is critical for ensuring
timely delivery. We do not take responsibility for lost, misplaced, or incorrectly delivered shipments if the address information
provided is incorrect or incorrectly entered at the time of purchase.
Damages
Please inspect the packaging of your item(s) when they arrive, if you notice any damage, you should make note of it when signing for delivery. If your item(s) do arrived damaged please send photos of damage, box and SKU, along with a brief description of the damage to sales@buildthepower.com and we will process an insurance claim on your behalf. Photos and videos must be sent for freight damage within 24 hours of arrival or the freight damage claim will not be valid. Any punctures, or visible signs of exterior damage must be reported within 24 hours.
Warranty
10 Years
Return Information
We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.
Should you decide to cancel your order prior to its shipment, a 3% deduction will be applied to cover platform fee expenses from the total paid amount.
To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase. Items that are not in this condition will not be accepted.
To start a return, you can contact us at sales@buildthepower.com If your return is accepted, we'll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.
Returns for reasons other than damaged items will require a 15-25% re-stocking fee, this depends on the size and freight cost of the item to ship back, we sell large items and shipping can be costly.
Returns/Cancellations after the item has shipped will also incur a 15-25% fee charged to you, as freight costs can be high for our products.
If your return is outside of the 30 day return period, your item will not be accepted.
You can always contact us for any return questions at sales@buildthepower.com.
Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item so that we can evaluate the issue and make it right.
Items that are damaged must be communicated to us within 24 hours of receiving the item.
Please note that if items have been taken out of the packaging and/or installed, returns may be voided depending on the manufacturer.
Some of our manufacturers do not accept returns for specific items, this must be considered when purchasing.
Exchanges
The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item.
Refunds
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method. Please remember it can take some time for your bank or credit card company to process and post the refund too.
You can contact us using the methods below.
US Customer Support Number: +1 507 636 3614
Email: sales@buildthepower.com
what’s included
The E2000LFP Expandable Power Station combines power and flexibility in a portable package. Link it with two EB3000 battery packs to reach an impressive 8064Wh capacity - enough for almost any power need.
With 2000W AC output, it runs most household devices and tools without breaking a sweat. The advanced LiFePo4 batteries deliver outstanding durability, keeping 80% capacity even after 3500 charging cycles.
Charging is quick and flexible. The station accepts up to 1300W input across multiple ports, with 600W maximum solar input. Using solar panels, you'll fully charge in 2-3 hours. Need it faster? Dual AC adapters cut that time to just 1.5-2 hours.
Specification
The E2000LFP Expandable Power Station combines power and flexibility in a portable package. Link it with two EB3000 battery packs to reach an impressive 8064Wh capacity - enough for almost any power need.
With 2000W AC output, it runs most household devices and tools without breaking a sweat. The advanced LiFePo4 batteries deliver outstanding durability, keeping 80% capacity even after 3500 charging cycles.
Charging is quick and flexible. The station accepts up to 1300W input across multiple ports, with 600W maximum solar input. Using solar panels, you'll fully charge in 2-3 hours. Need it faster? Dual AC adapters cut that time to just 1.5-2 hours.
Shipping & Delivery
The E2000LFP Expandable Power Station combines power and flexibility in a portable package. Link it with two EB3000 battery packs to reach an impressive 8064Wh capacity - enough for almost any power need.
With 2000W AC output, it runs most household devices and tools without breaking a sweat. The advanced LiFePo4 batteries deliver outstanding durability, keeping 80% capacity even after 3500 charging cycles.
Charging is quick and flexible. The station accepts up to 1300W input across multiple ports, with 600W maximum solar input. Using solar panels, you'll fully charge in 2-3 hours. Need it faster? Dual AC adapters cut that time to just 1.5-2 hours.
Top Solar and Generator Brands
Free U.S. Shipping
30-Day Returns
Expert Support Team
Get Started In 3 Simple Steps
The whole process is easy – no salespeople involved.
Step 1: Choose Your System
Pick your products at direct-to-you prices. Browse complete systems and see exactly what you'll pay.
Step 2: Place Your Order
Quick online checkout with free U.S. shipping. Your order ships within 3-5 business days.
Step 3: Power Up
Professional guidance for setup and connection. Our team helps you get the most from your power station.
The Build The Power Difference
Here’s why you’ll prefer us over other providers.
 |
OTHER PROVIDERS | |
|---|---|---|
 Straightforward Online Pricing |
 |
 |
 No Pushy Sales Tactics |
|
|
 Expert Technical Support |
|
|
 24/7 Digital Ordering |
|
|
 Clear Installation Steps |
|
|
 No Hidden Costs or Fees |
|
|
What Our Customers Say
Direct experiences from homeowners who took control of their energy costs.
Quis autem vel eum iure reprehenderit qui in ea voluptate velit esse quam nihil molestiae consequatur, vel illum qui dolorem eum fugiat quo voluptas nulla pariatur
- John S.
Quis autem vel eum iure reprehenderit qui in ea voluptate velit esse quam nihil molestiae consequatur, vel illum qui dolorem eum fugiat quo voluptas nulla pariatur
- John S.
Quis autem vel eum iure reprehenderit qui in ea voluptate velit esse quam nihil molestiae consequatur, vel illum qui dolorem eum fugiat quo voluptas nulla pariatur
- John S.
Quis autem vel eum iure reprehenderit qui in ea voluptate velit esse quam nihil molestiae consequatur, vel illum qui dolorem eum fugiat quo voluptas nulla pariatur
- John S.
Quis autem vel eum iure reprehenderit qui in ea voluptate velit esse quam nihil molestiae consequatur, vel illum qui dolorem eum fugiat quo voluptas nulla pariatur
- John S.
Love my product. Customer service was good. Overall happy
Great Customer Service
Great Product, Happy with my purchase
Frequently Asked Questions
How is Build The Power different from other companies?
Unlike traditional companies, we've removed the complex network of salespeople, project managers, and dealer fees. You browse and buy directly through our digital platform, cutting costs by 20-50% while still getting expert support when you need it.
How does your ordering process work?
Browse & Select – Find the product that suits your needs.Add to Cart – Click "Add to Cart" and proceed to checkout. Secure Payment – Complete your purchase using our secure payment options. Order Confirmation – You’ll receive an email confirmation with your order details. Shipping & Delivery – We process and ship your order as quickly as possible. A tracking number will be provided. If you have any questions, feel free to contact us!
Do you offer free shipping?
Yes! We offer free shipping on all orders, with no minimum purchase required. Enjoy hassle-free shopping without worrying about extra shipping costs. Once your order is processed, we’ll provide a tracking number so you can follow your shipment’s progress.
What's your return policy?
We offer a 30-day return policy for your peace of mind. If you're not completely satisfied with your purchase, you can return it within 30 days of delivery for a refund or exchange. The item must be in its original condition and packaging.
To start a return, contact our support team, and we’ll guide you through the process.
Can I get help with installation?
We do not offer installation services, but we’re happy to recommend trusted companies or services that can assist you. If you need help finding an installer, feel free to contact us, and we’ll point you in the right direction!
Top Solar and Generator Brands
Free U.S. Shipping
30-Day Returns
Expert Support Team
Also Recommended For You
Check out similar top-of-the-line products from premium American manufacturers.
(507) 636-3614
M-F 9-5 EST
sales@buildthepower.com
312 W. 2nd St Casper, WY 82601
