17KW Complete Offgrid Solar Kit + EG4 FlexBOSS21 + 2x 14.3KW 48V EG4 Lithium Indoor Wall Battery + 17.6KW Solar with Roof Mounting Rails and Wiring

The 17KW Complete Offgrid Solar Kit + EG4 FlexBOSS21 + 2x 14.3KW 48V EG4 Lithium Indoor Wall Battery + 17.6KW Solar with Roof Mounting Rails and Wiring  pairs a versatile EG4 FlexBOSS21 hybrid inverter/charger with two 14.3kWh EG4 Lithium Indoor Wall Batteries (28,600W usable storage) and a 17.6kW bifacial solar array. Designed as a scalable starter system for cabins and small–mid-sized off-grid homes, it’s capable of producing ~79,200W/day (at 4.5 peak sun hours) and includes roof mounting hardware and all core balance-of-system components for a clean install.

Specifications

• Solar Array: 32 × 550W bifacial mono panels (17,600W total)

• Inverter: EG4 FlexBOSS21 — 48V split-phase hybrid inverter/charger

• Battery Bank: 2 × 14.3kWh 48V EG4 Lithium Indoor Wall Batteries (28.6kWh total)

• Mounting: Complete IronRidge roof mounting rails, splices, legs, fasteners, and bolts

• Wiring & BOS: Solar combiner box, gutter box, Anderson battery cable set, 500’ PV direct-burial wire, 100’ 6 AWG AC cable, MC4 crimp kit, installation manual

Features

• High-Efficiency Bifacial Panels: Up to 25% rear-side gain; excellent weak-light performance; 5400 Pa snow / 2400 Pa wind; 30-year power warranty

• EG4 FlexBOSS21 Inverter: 48V split-phase hybrid design ideal for off-grid with robust charging and system management

• Appliance Compatibility: Runs wells, washers, fans, TVs, lights, refrigerators, freezers, electronics, and smaller AC systems

• Expandable System: Add panels or batteries later to grow production and storage

• DIY-Friendly: Installable with basic wiring skills; roof racking is typically the most labor-intensive step

• Use Cases: Ideal for small cabins, RVs, garages, pole barns, and mid-sized off-grid homes

Maintenance

• Daily: Check inverter status and battery state; ensure critical loads are operating normally

• Weekly: Inspect panel surfaces and wiring/MC4 connections; review production logs

• Annually: Full inspection of roof mounts, rails, fasteners, wiring, inverter, and battery terminals

Warranty

• Solar Panels: 30-year power performance warranty

• Inverter & Batteries: Manufacturer warranties per included specification sheets