BigBattery ETHOS Battery + EG4 FLEXBOSS18 ESS

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

X9 5.12kWh ETHOS + EG4 FLEXBOSS18 ESS Included Components: 1) [FETHS-48051-G1]: 48V 5.12kWh ETHOS Stackable Battery Module - 9 pcs 2) [CNT060]: ETHOS Control Box - 1 pcs 3) [INV031]: EG4 FLEXBOSS 18 Hybrid Inverter - 1 pcs 4) [CBL089]: CBL089 - 4 pcs 5) [CBL096]: CBL096 - 2 pcs 6) [CNT081]: ETHOS STACK BASE - 2 pcs 6) [CBL091]: CBL091 - 1 pcs

  • Home Batteries backup and daily cycling
  • Off-grid and solar self-consumption
  • Systems compatible with K0235 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
K0235
Unit
Set
Status
active

Compare similar models

Spec
Energy4Solar Score8085Best85
Price$15,445$3,749.99$3,399.99
Price per kWh—$232.92$212.5Best value
Capacity16.116
Voltage48V48V
ChemistryLiFePO4LiFePO4LiFePO4
Cycle life6000 cycles6000 cycles6000 cycles
Weight0 lbs0 lbs0 lbs
Warranty10 years10 years10 years
Rating000
In stock
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Which should you choose?

FAQ

The K0235 BigBattery ETHOS Battery + EG4 FLEXBOSS18 ESS is a home batteries solution built around LiFePO4 chemistry. Key specs include 6,000+ cycle life, 10 years warranty. Notable features: Synced from Zoho Books catalog; SKU: K0235; Ships from BigBattery. Priced at $15,445.00 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

BigBattery ETHOS Battery + EG4 FLEXBOSS18 ESS

SKU: K0235

80/100

$15,445

≈ $10,811.5 after 30% federal tax credit

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

Capacity
Voltage
Cycles
6,000
Weight
0 lbs
$2.57/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.

BigBattery ETHOS Battery + EG4 FLEXBOSS18 ESS

$15,445≈ $10,811.5 after ITC

View deal