EG4 FlexBOSS21 Hybrid Inverter

Why we recommend this

Our Energy Score for this model is 80/100 (Excellent). We weighed round-trip efficiency, warranty depth, compatibility, and real-world use cases for home batteries.

  • LiFePO4 chemistry for long cycle life and thermal stability
  • 6,000+ rated cycles for years of daily use
  • 10 years manufacturer warranty

Purchases through our links support independent testing at no extra cost to you.

Overview

The EG4 EG4 FlexBOSS21 Hybrid Inverter is a home batteries solution built around LiFePO4 chemistry. Key specs include 16 kW AC capacity, 48V nominal voltage, 6,000+ cycle life, 10 years warranty. Notable features: Synced from Zoho Books catalog; SKU: INV027; Ships from BigBattery. Priced at $3,599.99 and currently in stock, this model scores 80/100 on our Energy Score — we weigh efficiency, warranty depth, compatibility, and real-world use cases for home batteries.

  • Home Batteries backup and daily cycling
  • Off-grid and solar self-consumption
  • Systems compatible with EG4 equipment

Pros & cons

Pros

  • LiFePO4 chemistry for long cycle life and thermal stability
  • 6,000+ rated cycles for years of daily use
  • 10 years manufacturer warranty
  • Currently available to order
  • Strong Energy Score (80/100) in our independent ranking

Cons

  • Premium price point — compare total system cost before buying
  • Limited verified customer reviews on our platform so far

Technical specifications

SKU
INV027
Unit
pcs
Status
active

Compare similar models

Spec
Energy4Solar Score8085Best85
Price$3,599.99$3,749.99$3,399.99
Price per kWh—$232.92$212.5Best value
Capacity16 kW AC16.116
Voltage48V48V48V
ChemistryLiFePO4LiFePO4LiFePO4
Cycle life6000 cycles6000 cycles6000 cycles
Weight0 lbs0 lbs0 lbs
Warranty10 years10 years10 years
Rating000
In stock
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FAQ

The EG4 EG4 FlexBOSS21 Hybrid Inverter is a home batteries solution built around LiFePO4 chemistry. Key specs include 16 kW AC capacity, 48V nominal voltage, 6,000+ cycle life, 10 years warranty. Notable features: Synced from Zoho Books catalog; SKU: INV027; Ships from BigBattery. Priced at $3,599.99 and currently in stock, this model scores 80/100 on our Energy Score — we weigh efficiency, warranty depth, compatibility, and real-world use cases for home batteries.

Affiliate disclosure:Energy4Solar is an independent research & comparison site. You complete your purchase securely on the retailer's own site (such as BigBattery, Signature Solar, Solar Guys, or Amazon), and we may earn a commission at no extra cost to you. Prices and availability are set by the retailer and may change — always confirm the current price before checkout.

Related products

80/100

EG4 FlexBOSS21 Hybrid Inverter

SKU: INV027

80/100

$3,599.99

≈ $2,519.99 after 30% federal tax credit

Price shown is for comparison only. See the live price at checkout.

Capacity
16 kW AC
Voltage
48V
Cycles
6,000
Weight
0 lbs
$0.60/cycle
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Affiliate disclosure:Energy4Solar is an independent research & comparison site. You complete your purchase securely on the retailer's own site (such as BigBattery, Signature Solar, Solar Guys, or Amazon), and we may earn a commission at no extra cost to you. Prices and availability are set by the retailer and may change — always confirm the current price before checkout.

EG4 FlexBOSS21 Hybrid Inverter

$3,599.99≈ $2,519.99 after ITC

View deal