Fortress Power eVault Max 18.5 kWh Lithium Ferro Phosphate Battery + FREE Lifetime Customer Support!
Fortress Power eVault [MAX] 18.5 Kilowatt-hour Lithium Battery Storage
The newest innovative Lithium Iron Phosphate battery from Fortress Power is the eVault Max 18.5 kWh. An all-in-one solution for your residential and commercial needs. Scalable up to 370kWh with serviceable top cover access to make installation of this battery simple and worry-free. The eVault Max is AC/DC coupled to solar arrays and works for many applications that require solar storage, including Off-Grid, Back-Up power, self-supply, and Peak Charge Reduction just to name a few.
Not only is the new fortress eVault Max 18.5 kWh battery safe, long-lasting and affordable, but is also equipped with a brand new LCD screen that displays voltage, current, state of charge, and power output and operating status. The built-in smart battery management system integrates multilevel safety concepts for excellent performance.
Latest Technology: We use the safest, environmentally friendly prismatic Lithium Iron Phosphate cells.
Lowest Cost per cycle: Competitively priced and easy to install with >98% round-trip efficiency.
Flexible and Scalable: Expandable from 18.5 kWh to 370 kWh for both residential and commercial buildings
Long-Lasting: 10-year warranty; up to 6,000+ cycles
Smart and Advanced: The smart relay-based Battery Management System, supports closed-loop communication with various hybrid inverters for best performance - scalable up to 20 units
Fortress Power eVault MAX 18.5 Specifications:
- Total Energy: 18.5 kWh
- Nominal Voltage: 51.2(48)V
- Voltage Range: 45-58.4 V
- Recommended Charge Current: 150 Amp
- Max. Charge Current(Continuous): 180 Amp
- Max. Discharge Current(Continuous): 180 Amp
- Recommend Storage temperature: 50 to 95 F
- Charge temperature: 32 to 113 F
- Capacity: 370 Amp-hour
- UL 9540 Listed
- Dimension(H x W x D): 42.2" x 20.3" x 20.3"
- Weight: 520 lbs
The following sizing recommendations will affect the warranty if not followed. Fortress Power minimum battery bank sizing recommendations for common battery-based inverters (Magnum, OutBack, Phocos, Schneider Electric, SMA Sunny Island, Sol-Ark, Victron, etc): Fortress sizing recommendations.
Fortress Power eVault MAX 18.5 Product Documents:
Fortress Power eVault 18.5 Technical Datasheet
Fortress Power eVault Max 18.5 Manual
Fortress Power eVault 18.5 Warranty
Fortress Power Chemistry Comparison Chart
Fortress Power Brand Comparison Chart
Fortress Power Magnum Energy Integration Guide
Fortress Power OutBack Integration Guide
Fortress Power Schneider Electric Integration Guide
Fortress Power SMA Sunny Island Integration Guide
Shipping Times | Estimated delivery time for in-stock orders placed today is 5-10 business days. Due to the increase in demand for off-grid solar products in 2022, our average shipping times for most orders is currently 9-12 business days. |
Shipments & Lead Times:
We process all orders within 72 hours. From there, we do our best to ship as quickly as possible. Shipping times vary depending on the product and size of your order. We will send you your tracking information to the e-mail and/or phone number on file.
With the incredible demand for solar products, our average delivery time to your door is between 9-12 business days from date of order. However, for some products, shipping can be as fast as 5-7 business days to your door. Please check specific product pages for the most accurate information.
*As of the start of 2022 - our stock levels are healthy and shipments are moving relatively quickly. If you place an order for something that is not in stock, or is on backorder, our team will reach out to you within 24-72 hours of placing your order to determine how you would like to move forward.
If you have any questions, give us a call at 877-242-2792 or reach out via email / live chat.
Product Description
Fortress Power eVault Max 18.5 kWh Lithium Ferro Phosphate Battery + FREE Lifetime Customer Support!
Fortress Power eVault [MAX] 18.5 Kilowatt-hour Lithium Battery Storage
The newest innovative Lithium Iron Phosphate battery from Fortress Power is the eVault Max 18.5 kWh. An all-in-one solution for your residential and commercial needs. Scalable up to 370kWh with serviceable top cover access to make installation of this battery simple and worry-free. The eVault Max is AC/DC coupled to solar arrays and works for many applications that require solar storage, including Off-Grid, Back-Up power, self-supply, and Peak Charge Reduction just to name a few.
Not only is the new fortress eVault Max 18.5 kWh battery safe, long-lasting and affordable, but is also equipped with a brand new LCD screen that displays voltage, current, state of charge, and power output and operating status. The built-in smart battery management system integrates multilevel safety concepts for excellent performance.
Latest Technology: We use the safest, environmentally friendly prismatic Lithium Iron Phosphate cells.
Lowest Cost per cycle: Competitively priced and easy to install with >98% round-trip efficiency.
Flexible and Scalable: Expandable from 18.5 kWh to 370 kWh for both residential and commercial buildings
Long-Lasting: 10-year warranty; up to 6,000+ cycles
Smart and Advanced: The smart relay-based Battery Management System, supports closed-loop communication with various hybrid inverters for best performance - scalable up to 20 units
Fortress Power eVault MAX 18.5 Specifications:
- Total Energy: 18.5 kWh
- Nominal Voltage: 51.2(48)V
- Voltage Range: 45-58.4 V
- Recommended Charge Current: 150 Amp
- Max. Charge Current(Continuous): 180 Amp
- Max. Discharge Current(Continuous): 180 Amp
- Recommend Storage temperature: 50 to 95 F
- Charge temperature: 32 to 113 F
- Capacity: 370 Amp-hour
- UL 9540 Listed
- Dimension(H x W x D): 42.2" x 20.3" x 20.3"
- Weight: 520 lbs
The following sizing recommendations will affect the warranty if not followed. Fortress Power minimum battery bank sizing recommendations for common battery-based inverters (Magnum, OutBack, Phocos, Schneider Electric, SMA Sunny Island, Sol-Ark, Victron, etc): Fortress sizing recommendations.
Fortress Power eVault MAX 18.5 Product Documents:
Fortress Power eVault 18.5 Technical Datasheet
Fortress Power eVault Max 18.5 Manual
Fortress Power eVault 18.5 Warranty
Fortress Power Chemistry Comparison Chart
Fortress Power Brand Comparison Chart
Fortress Power Magnum Energy Integration Guide
Fortress Power OutBack Integration Guide
Fortress Power Schneider Electric Integration Guide
Fortress Power SMA Sunny Island Integration Guide
Shipping & Delivery
Shipping Times | Estimated delivery time for in-stock orders placed today is 5-10 business days. Due to the increase in demand for off-grid solar products in 2022, our average shipping times for most orders is currently 9-12 business days. |
Shipments & Lead Times:
We process all orders within 72 hours. From there, we do our best to ship as quickly as possible. Shipping times vary depending on the product and size of your order. We will send you your tracking information to the e-mail and/or phone number on file.
With the incredible demand for solar products, our average delivery time to your door is between 9-12 business days from date of order. However, for some products, shipping can be as fast as 5-7 business days to your door. Please check specific product pages for the most accurate information.
*As of the start of 2022 - our stock levels are healthy and shipments are moving relatively quickly. If you place an order for something that is not in stock, or is on backorder, our team will reach out to you within 24-72 hours of placing your order to determine how you would like to move forward.
If you have any questions, give us a call at 877-242-2792 or reach out via email / live chat.
Customer Reviews

Select Cable Length (Ft.)
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Choose Your Battery:
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