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Fortress Power | Envy Inverter 8 KW 10 Year Warranty

SKU: Envy Inverter 8 KW 10 year warranty
$4,599.00 $5,599.00
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When you invest in a solar kit, you want to have peace of mind knowing that you have all the support you need to ensure that it’s always working properly.

At Solar Sovereign, providing legendary customer support is at our core, so we provide all of our customers with lifetime support.

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Frequently Asked Questions

What countries do you ship to?

We currently ship to the United States, To enquire about shipping to a different destination, please contact us.

How long will it take to receive my order?

Standard freight shipping normally takes 5-7 business days.

For remote locations 7-15 business days.

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We're happy to accommodate special carrier requests

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Items must be returned within 30 days after receiving your order. Items must be returned in the same condition in which they were received, be unworn/unused, have any tags still attached, and include all the original packaging.

Please see individual product page for more specific details, returns vary for each product.

How long will it take to receive my refund?

Refunds are processed within 7 days from when we receive the item(s).

Where do the products ship from?

Most of our products ship from the Dallas Fort-Worth area. If you'd like to know the specific location a product will ship from, please don't hesitate to ask. We're here to provide you with all the information you need!

Where are you guys based out of?

We are based out of Dallas Texas!

Fortress Power | Envy Inverter 8 KW
Fortress Power

Fortress Power | Envy Inverter 8 KW 10 Year Warranty

$4,599.00 $5,599.00

The Fortress Power Envy 8kW and 10kW are a whole-home, all-in-one inverter solution. Paired with the Fortress Power eFlex 5.4 kWh, the eVault MAX 18.5 kWh or LFP-10 MAX batteries, the Envy features a 90A AC passthrough providing up to 8kW (33.3@ 240V) or 10kw (41.6A @240V) of whole-home backup power. The Envy features a built-in generator input with AC/DC coupling, on- and off-grid capabilities, plus a 2 MPPT output allowing for a maximum of 13 kW PV array (Envy 8kW) or 15kW PV array (Envy 10kW). The Envy is equipped with a built-in APsmart Module Level Rapid Shutdown Transmitter and Button, along with integrated AC & DC breakers allowing for fast installation and commissioning. Use our online monitoring app to access your system from anywhere.

Key Features:

  • IP65 Rated For Indoor & Outdoor Installations
  • 2 MPPTs Output For:
    • Max Input 13KW PV Array (Envy 8kW) 
    • Max Input 15KW PV Array (Envy 10kW)
  • AC/DC Coupling
  • 90A Built-In Auto Transfer Switch
  • Built-In Generator Input
  • 5 Units In Parallel
  • Online Monitoring/App
  • Color LCD Touch Screen.
  • 3 Phase Compatible (Upcoming Feature)

Supported Applications:

  • Backup
  • Off-Grid
  • Zero Export
  • Time-Of-Use
  • Virtual Power Plant

Whole-Home Backup One-Line Diagram

Fortress Power Envy 8k


Envy 8kw
Input DC (PV Side)
Max. DC Input Power for Single MPPT 6000W / 6000 W 6000W / 6000 W
Max. PV Input Power 13000W 15000W
Max. PV Power Delivered to Battery & AC Outputs 12000W 12000W
DC Input Voltage Range 100V-600V 100V-600V
Nominal DC Input Voltage 360V 360V
Full Power MPPT Voltage Range 170V-500V 210V – 500V
Max. DC Input Current 25A / 25A 25A / 25A
MPPT Number/(Strings per MPPT) 2 / 2 2 / 2
Output/Input AC (Grid)
Continuous AC Power to Grid 8000W (240V) 10000W (240V)
Continuous AC Power to Load with Grid or Generator 21000W (240V) AC Passthrough/ 12000W (240) GEN 21000W (240V) AC Passthrough/ 12000W GEN
Nominal Output Voltage 120V/240V 120V/240V
Max. Continuous AC Current 33.3A @ 240V 41.6A @ 240V
Nominal AC Frequency 50Hz/60Hz 50Hz/60Hz
Output AC (Off-Grid)
Max. Output Power 8000W 10000W
Nominal Output Voltage 120V/240V 120V/240V
Nominal Output Frequency 50Hz/60hZ 50Hz/60hZ
Nominal Output Current 33.3A @ 240V 41.6A @ 240V
Peak Power 16kW / 500ms 20kW / 500ms
Switching Time Seamless Seamless
Dedicated Auto-start Generator Port 50A / 12kW 50A / 12kW
Battery Parameters
Compatible Battery Type eVault Max, eFlex, LFP-10 MAX eVault Max, eFlex, LFP-10 MAX
Nominal Battery Voltage 48V 48V
Battery Voltage Range 48V-56V 48V-56V
Maximum Charging/Discharging Current 167A 210A
Maximum Charging/Discharging Power 8000W 10000W
MPPT Efficiency 99.9% 99.9%
Max. Efficiency 97.5% 97.5%
CEC Efficiency 96.5% 96.5%
Anti-islanding Protection YES YES
Ingress Protect Degree NEMA 4X, IP65 NEMA 4X, IP65
SPD Protection YES YES
RSD Built-in APsmart Transmitter Built-in APsmart Transmitter
General Data
Dimensions 580 x 490 x 265mm (22.8 x 19.3 x 10.4 in) 580 x 490 x 265mm (22.8 x 19.3 x 10.4 in)
Weight 44kg (97lbs) 44kg (97lbs)
Display Color LCD Color LCD
Ambient Temperature Range -25 to 60 °C (-13 to 140 °F) -25 to 60 °C (-13 to 140 °F)
Cooling FAN FAN
Communication RS485/Wi-Fi/CAN RS485/Wi-Fi/CAN
Standard & Certification
Certifications UL1741, UL1741SB, IEEE1547A, rule 21, ISO-NE, FCC15 class B, HECO, CEC, Luma UL1741, UL1741SB, IEEE1547A, rule 21, ISO-NE, FCC15 class B, HECO, CEC, Luma
Warranty 5 Years (Optional 10 Years) 10 Years


Fortress Power Warranty – Envy 8k (CDBG)


Order Confirmation:

As soon as you place your order, you will receive an order confirmation email. 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

No Shipping outside the USA.

Shipping Options

Our base "Curb-side" Pickup shipping is usually completely free! This option usually takes between 5-15 days to arrive at your doorstep, after you have submitted your order. There are other options available, however. We also offer the below options for some products. Please contact us for more information about these prior to ordering.

Threshold Shipping: This involves the item being brought onto your porch, or into a sheltered/garage area.
White Glove Delivery: This includes the item being brought into your room of choice, any minor assembly, and all boxes and packaging removed from your house!


Envy 10kW Inverter – Data Sheet

Envy Battery-Inverter Integration Guide

Fortress Power System Design Tool

Envy Inverter Monitoring Setup Guide

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