EG4 Electronics

EG4 FlexBOSS21 + WallMount All Weather Battery ESS

ESS

EG4 FlexBOSS21 + WallMount All Weather Battery ESS

ESS

The EG4® FlexBOSS21 WallMount All Weather Battery Energy Storage System (ESS) delivers dependable power for your home, indoors or out. When the grid goes down, it seamlessly powers your essentials—think lights, appliances, or even your garage workshop—keeping your routine uninterrupted. Built to withstand tough outdoor conditions with integrated heating, it’s perfect for any environment. 

Installer-trusted and homeowner-friendly, this system offers high performance without the high cost. Check its status from your phone and scale it up as your needs evolve. UL 9540 certified, it’s designed to keep your home powered with confidence. 

Uninterrupted Power:  
Seamless backup for essential systems during outages. 

Outdoor Durability:  
Weather-resistant design for reliable outdoor performance. 

High Capacity:  
Up to 16kW output for demanding applications. 

Flexible Use:  
Supports on-grid and off-grid configurations. 

Easy Installation:  
Plug-and-play setup for quick deployment. 

Scalable System:  
Expand to meet future energy demands. 

Smart Monitoring:  
Remote tracking for performance insights. 

Certified Safety:  
ETL listed to UL 9540 for peace of mind. 

When configured as a UL 9540 certified ESS:  

  • Min Configuration: 1 EG4 FlexBOSS21 All-in-One Hybrid Inverter and 1 EG4 WallMount All Weather Battery 
  • Max Configuration: 3 EG4 FlexBOSS21 All-in-One Hybrid Inverters and 6 EG4 WallMount All Weather Batteries 
  • Total Output Power (kW): 16kW-48kW @ 240V, 13.8-41.4 kW @ 208V (on-grid with PV) 
  • Total Energy Capacity (kWh): 14.3-85.8 kWh  

 

Additional capacity may be possible by spacing ESSs 3 ft apart per NFPA 855 and IRC R328 guidelines. Consult AHJ prior to installation for permissible configurations. 

California Proposition 65 Warning 

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EG4 FlexBOSS21 + WallMount All Weather Battery ESS

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