the DELTA 3 Ultra is your all-in-one

✅ Cold-Weather Ready: Internal battery heater powers through temps as low as -22°F

Color-Coded Pairs – Includes both orange (positive) and black (negative) cables for clear

It has 1344Wh

Maximum Power: 200W

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 Deep Cycle Batteries the DELTA 3 Ultra isPower larger solar + storage systems with the Fortress Power Envy Duo 21, a high capacity 48V hybrid inverter built for demanding residential and light commercial energy needs. With up to 25kW PV input, dual voltage compatibility (240V split phase 208V three phase), and scalable paralleling up to 120kW, its a future ready solution for backup power, off grid setups, zero export, TOU optimization, and more. Key Features & Benefits: High PV input