25KW Complete Offgrid Solar Kit + EG4 FlexBOSS21 +  2x 14.3KW 48V EG4 Lithium Indoor Wall Battery + 26.4KW Solar with Ground Mount and Wiring

The 25KW Complete Offgrid Solar Kit + EG4 FlexBOSS21 +  2x 14.3KW 48V EG4 Lithium Indoor Wall Battery + 26.4KW Solar with Ground Mount and Wiring pairs dual EG4 FlexBOSS21 hybrid inverters with a 28,600W usable lithium battery bank using (2×) 14.3KW EG4 indoor wall batteries. The high-output 26.4KW bifacial solar array generates approximately 118,800 watts per day under 4.5 peak sun hours, making this system ideal for larger homes consuming around 3,500 kWh/month. Designed for expandability, the system includes ground-mount racking, full wiring, safety components, and is capable of supporting future upgrades in panels or batteries.

Specifications

• Solar Array: 48 × 550W bifacial mono panels (26,400W total)

• Inverters: 2 × EG4 FlexBOSS21 48V split-phase hybrid inverter/chargers

• Battery Bank: 2 × 14.3KW EG4 Lithium Indoor Wall Batteries (28,600W usable)

• Ground Mount System: Iron Ridge rails, top caps, connectors & hardware (uses customer-supplied 3" SCH40 pipe)

• Balance of System: 2 × combiner boxes, 2 × gutter boxes, Anderson battery cable set, 500' PV wire, 100' 6 AWG AC cable, 20' 2/0 main line, 2 × AC combiner kits, MC4 crimp kit, installation manual

Features

• High-Efficiency Bifacial Panels: Up to 25% additional backside energy gain; superior low-light performance

• EG4 FlexBOSS21: Advanced split-phase hybrid inverter with MPPT, generator support, AC/DC coupling, and flexible system design

• Lithium Wall Batteries: Long-life, high-capacity indoor batteries built for reliable whole-home backup

• Durability: 5400 PA snow load / 2400 PA wind load on double-glass panels

• Appliance Capability: Runs well pumps, washers, fans, TVs, lighting, refrigerators, freezers, electronics, and smaller AC systems

• Ground Mount System: Built around 3" pipe (customer-supplied), all remaining hardware included

Maintenance

• Daily: Monitor inverter and battery status; ensure panels stay unobstructed

• Weekly: Inspect cabling, ground mount structure, and verify battery communication

• Annually: Clean panels, tighten mounting hardware, check wiring runs, and update inverter firmware

Warranty

• Solar Panels: 30-year performance warranty

• Batteries & Inverters: Manufacturer warranties per provided documentation