Product Description

$250 Off Orders Over $5,000
BigBattery and EG4 orders of $5,000 or more qualify for $250 off, applied automatically at checkout. No discount code required.

An all-EG4 energy storage system: the FlexBOSS18 hybrid inverter (18 kW PV / 13 kW AC, split-phase, 3 MPPT) paired with EG4 WallMount 314Ah All-Weather batteries — 16 kWh per unit, rated for outdoor mounting. Configure one to three batteries for 16, 32, or 48 kWh of storage.

What's in the kit

  • 1 × EG4 FlexBOSS18 hybrid solar inverter (18 kW PV / 13 kW AC, split-phase, 3 MPPT)
  • Your choice of 1, 2, or 3 × EG4 WallMount 48V 314Ah All-Weather batteries (16 kWh each)

Key features

  • All-weather rated: wall-mount batteries designed for outdoor installation — no dedicated battery room required.
  • Single-brand ecosystem: EG4 inverter and EG4 batteries communicate natively for closed-loop operation.
  • Split-phase 120/240V output for standard North American home circuits.
  • Remote Wi-Fi monitoring of production and battery state from the app.

Good to know

Select your capacity from the Battery Configuration menu — pricing is for the complete kit. Ships by freight carrier; delivery timing is confirmed once your order is accepted. Professional installation by a licensed electrician is recommended, and local permitting requirements apply to home energy storage installations.

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