Fortress Power FP-Mega-S4A-O

FP-Mega-S4A-O: 418 kWh nameplate energy; 209 kW continuous; lithium ion.

• Nameplate energy (CEC)418 kWh
• Max continuous discharge (CEC)209 kW
• Full-power discharge timeabout 2 h at full power
• ChemistryLithium Ion

• UL 1973 (stationary battery)Certified by UL
• Certificate date & editionDec 24, 2025 · Ed. 3 : 2022