Fortress Power LLC FP-Envy Duo 21

The Fortress Power LLC FP-Envy Duo 21 is a hybrid inverter from Fortress Power LLC. Rated AC output 13.9 kW. Listed and verified: UL 1741. Sold in United States.

Specifications

Rated AC output: 13.9 kW

Product details

Product type: Hybrid inverter
Brand: Fortress Power LLC
Category: Home Solar & Hybrid Inverters
Sold in: United States
Listed in: California Energy Commission

Models (1)

Model	AC output
FP-Envy Duo 21	13.899 kW

Certifications

Certification	Market	Status	Reference	Valid until
UL 1741	United States	✓ Verified 19 October 2026	Intertek

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