Fortress Power Envy Duo 21 Hybrid Inverter | 48V | 25kW PV Input | 12kW Backup | 240V Split-Phase & 208V 3-Phase | Parallel to 120kW | 10-Year Warranty
Fortress PowerInverter/Charger
ShopSolar$4898$7200
Price & Discount Metrics
Current Price
$4898
MSRP
$7200
Savings
$2302 (32%)
Recent Change
$-861.54
Historical Lowest
$4898
ATL Status
★ Active ATL
Last Price Update
Oct 8, 2026
Price History
Historical pricing tracking over time