Uploaded August 2026 | Updated September 2026, 2 weeks ago

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The Fortress Power ENVY Duo 21 is a powerful inverter with a 12kw output and the ability to take in 21k of solar power. The eBoost battery is a LiFePo4 16kwh battery with self heating. It works seamlessly with the ENVY inverter. The gradian system also allows the inverter and battery to connect to the internet for monitoring and updates.

In this overview I install the inverter on the wall and connect the battery so that we can see how well it works. I have 3kw of solar feeding the system to charge it.

You can find more information on the Fortress Power Equipment here:

Envy Duo 21 inverter.
ussolarsupplier.com/products/fortress-power-16kw-whole-home-solar-hybrid-inverterenvy-duo-21-us-16kw?sca_ref=11012358.QtlRV7sDjJ3R3J

Find the battery here:
ussolarsupplier.com/products/fortress-power-16kw-lfp-battery-eboost-16-kwh?sca_ref=11012358.QtlRV7sDjJ3R3J

Stay tuned for an actual full installation of this system in a small cottage.

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