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FoxESS EQ4000 Battery+72A battery cell - EQ4000 (AIO) ( 97-221-00001-00 )

FoxESS EQ4000 Battery+72A battery cell - EQ4000 (AIO) ( 97-221-00001-00 ) | Portlandia Electric Supply

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FoxESS EQ4000 Battery+72A battery cell - EQ4000 (AIO) ( 97-221-00001-00 )

$2,009.43 USD

$ $2,009.43 USD

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9+ sold

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We offer several ways to pay to make getting your solar kit simple:

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You can arrange financing during the checkout process, or scroll further down this page for more details. Please note, if you'd like to finance your order, you can do so instantly, right at checkout.

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FoxESS EQ4000 battery — 3.97 kWh AIO high-voltage LFP module

The FoxESS EQ4000 Battery with 72A battery cell is a next-generation energy storage solution designed to deliver reliable, scalable, and efficient power for modern energy needs. Built with advanced lithium battery technology, this system suits residential, commercial, and light industrial energy storage. Engineered for longevity, safety, and seamless integration, the EQ4000 series is a dependable choice for users seeking steady performance and energy independence.

This powerful solution is also available as FoxESS EQ4000 Battery+72A battery cell - EQ4000 (AIO) ( 97-221-00001-00), providing an all-in-one configuration that simplifies installation and system management while maintaining high efficiency.

FoxESS EQ4000 battery is a high-voltage, stackable LFP module designed for PowerQ All-in-One (AIO) systems. Each module delivers 3.97 kWh; you can stack 2–5 modules with AIO inverters (3.8–11.4 kW)—enabling clean, fast, plug-and-play installations.

Key features

FoxESS EQ4000 battery offers 90% DoD, >95% round-trip efficiency, CAN BMS communications, and an IP65 enclosure—perfect for indoor or outdoor floor-mount setups. The Quick Guide shows per module thickness ~5.4″ for compact stacks.

Capacity: 3.97 kWh per module (LFP prismatic cells)
Stacking (AIO): 2–5 modules ⇒ 7.95 / 11.92 / 15.90 / 19.87 kWh
Electrical: 50 A charge/discharge continuous, 65 A peak (60s); >95% efficiency
Environment: IP65; operating −10 to 55 °C; storage −20 to 55 °C; ≤2000 m altitude
Compliance: UL1973, UL9540, UL9540A; UN38.3 transport

Specifications

**FoxESS EQ4000 battery** — specification box (AIO application)
Module
Nominal energy	3.97 kWh (LiFePO₄)
Dimensions (W × D × H)	≈ 22.4″ × 15.0″ × 5.4″ (per module)
Weight	≈ 87 lb (dealer listing)
Ingress	IP65 · natural convection
AIO stack configurations
2 modules	7.95 kWh · 115.2 V nominal (97.2–131.4 V)
3 modules	11.92 kWh · 172.8 V (145.8–197.1 V)
4 modules	15.90 kWh · 230.4 V (194.4–262.8 V)
5 modules	19.87 kWh · 288 V (243–328.5 V)
Electrical limits
Depth of discharge	90% (typ.)
Charge / discharge current	50 A continuous · 65 A (60 s) peak
Round-trip efficiency	>95%
Environmental & compliance
Operating / storage	−10 to 55 °C / −20 to 55 °C · 0–100% RH (non-condensing) · ≤2000 m
Certifications	UL1973 · UL9540 · UL9540A · UN38.3
Warranty	Standard 12.5 years (see Fox ESS battery warranty T&Cs)

For PowerQ AIO builds, the FoxESS EQ4000 battery is a compact, scalable block—providing seamless expansion and fast commissioning with 2–5 module stacks for 7.95–19.87 kWh.

Why Choose the FoxESS EQ4000 Battery with 72A Battery Cell?

The FoxESS EQ4000 Battery with 72A battery cell stores energy efficiently and supports rapid discharge and charge rates. Its 72A cell enables fast energy transfer for stable power at peak demand. This battery fits backup power, solar storage, and grid-independent systems perfectly.

With compact, modular design, the system expands easily to meet dynamic energy needs. Users gain enhanced energy use, less dependency on the grid, and better long-term performance.

Advanced Technology and Smart Energy Management

Intelligent battery management technology is at the core. It monitors voltage, temperature, and current for safe and steady operations. The advanced battery management system protects against overcharging, deep discharge, overheating, and shorts.

The FoxESS EQ4000 Battery+72A battery cell - EQ4000 (AIO) ( 97-221-00001-00) integrates key components in one unit. This reduces complexity, increases reliability, and minimizes system losses for optimal energy flow.

High Efficiency and Long Cycle Life

Efficiency and durability define this battery. Designed for frequent charge-discharge cycles, it delivers consistent performance through thousands of cycles. Lithium chemistry provides higher energy density, lower self-discharge, and better thermal stability versus traditional batteries.

Its long cycle life suits daily energy use—especially in solar and hybrid systems where reliability is critical. Expect stable output with minimal degradation over long periods.

Flexible Installation and Scalable Design

Modular design enables flexible installations, whether wall- or floor-mounted. The system fits varied environments without taking much space. Its scalable nature lets users add battery modules as energy needs grow.

The all-in-one setup simplifies wiring and configuration, making the FoxESS EQ4000 Battery+72A battery cell - EQ4000 (AIO) ( 97-221-00001-00) ideal for both new builds and upgrades.

Ideal Applications for the FoxESS EQ4000 Battery

The FoxESS EQ4000 Battery with 72A battery cell powers many uses, including:

Residential solar energy storage systems
Commercial backup power solutions
Hybrid solar and grid-connected systems
Energy optimization and peak-load management
Off-grid and remote power setups

Strong discharge capability ensures power continuity during outages. Smart energy management maximizes savings and overall system efficiency.

Safety, Reliability, and Performance You Can Trust

Safety remains a priority in energy storage. The FoxESS EQ4000 Battery with 72A battery cell features multiple protection layers. The integrated BMS, sturdy casing, and thermal controls ensure safe operation under various conditions.

With reliable performance, smart controls, and scalable design, this battery system offers a robust solution for modern energy needs. The EQ4000 series combines innovation, safety, and efficiency into one high-performance unit.

What is your return policy?

What’s covered by your return policy?

How long will it take to receive my order?

What are your financing and payment options?

We offer several ways to pay to make getting your solar kit simple:

Credit Card: if the purchase is greater than your card’s limit, you can split the cost onto multiple cards as well as Paypal, financing through Affirm, and ACH/bank transfer

You can arrange financing during the checkout process, or scroll further down this page for more details. Please note, if you'd like to finance your order, you can do so instantly, right at checkout.

How does your Lifetime Customer Support work?

FoxESS EQ4000 battery — 3.97 kWh AIO high-voltage LFP module

Key features

Capacity: 3.97 kWh per module (LFP prismatic cells)
Stacking (AIO): 2–5 modules ⇒ 7.95 / 11.92 / 15.90 / 19.87 kWh
Electrical: 50 A charge/discharge continuous, 65 A peak (60s); >95% efficiency
Environment: IP65; operating −10 to 55 °C; storage −20 to 55 °C; ≤2000 m altitude
Compliance: UL1973, UL9540, UL9540A; UN38.3 transport

Specifications

**FoxESS EQ4000 battery** — specification box (AIO application)
Module
Nominal energy	3.97 kWh (LiFePO₄)
Dimensions (W × D × H)	≈ 22.4″ × 15.0″ × 5.4″ (per module)
Weight	≈ 87 lb (dealer listing)
Ingress	IP65 · natural convection
AIO stack configurations
2 modules	7.95 kWh · 115.2 V nominal (97.2–131.4 V)
3 modules	11.92 kWh · 172.8 V (145.8–197.1 V)
4 modules	15.90 kWh · 230.4 V (194.4–262.8 V)
5 modules	19.87 kWh · 288 V (243–328.5 V)
Electrical limits
Depth of discharge	90% (typ.)
Charge / discharge current	50 A continuous · 65 A (60 s) peak
Round-trip efficiency	>95%
Environmental & compliance
Operating / storage	−10 to 55 °C / −20 to 55 °C · 0–100% RH (non-condensing) · ≤2000 m
Certifications	UL1973 · UL9540 · UL9540A · UN38.3
Warranty	Standard 12.5 years (see Fox ESS battery warranty T&Cs)

For PowerQ AIO builds, the FoxESS EQ4000 battery is a compact, scalable block—providing seamless expansion and fast commissioning with 2–5 module stacks for 7.95–19.87 kWh.

Why Choose the FoxESS EQ4000 Battery with 72A Battery Cell?

With compact, modular design, the system expands easily to meet dynamic energy needs. Users gain enhanced energy use, less dependency on the grid, and better long-term performance.

Advanced Technology and Smart Energy Management

High Efficiency and Long Cycle Life

Its long cycle life suits daily energy use—especially in solar and hybrid systems where reliability is critical. Expect stable output with minimal degradation over long periods.

Flexible Installation and Scalable Design

The all-in-one setup simplifies wiring and configuration, making the FoxESS EQ4000 Battery+72A battery cell - EQ4000 (AIO) ( 97-221-00001-00) ideal for both new builds and upgrades.

Ideal Applications for the FoxESS EQ4000 Battery

The FoxESS EQ4000 Battery with 72A battery cell powers many uses, including:

Residential solar energy storage systems
Commercial backup power solutions
Hybrid solar and grid-connected systems
Energy optimization and peak-load management
Off-grid and remote power setups

Strong discharge capability ensures power continuity during outages. Smart energy management maximizes savings and overall system efficiency.

Safety, Reliability, and Performance You Can Trust

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Customer Success Stories

Troy P

EG4 off-grid base kit, Happy with my purchase.

This is the first stage of my three planned purches. I got the eg4 inverter 6000 XP base kit with six 400 watt panels and the two server rack batteries. Did a little online research and followed the instructions and it got set up without any issues. Right now I'm just running it in my garage on a single outlet and have been running dual 750 watt water distillers with it. Once I get the second inverter and a bunch more panels and batteries, I plan on attaching it to my subpanel in my house that has my lights and outlets and appliances on it. Then I'll get a soft start for my AC and blower and run it on my main panel.

Jacob B

Easy Process, Genuine Support

Trying to pick the correct solar system for your needs can be very technical and frustrating. I wanted to thank Yvhan and the Portlandia Electric supply team for their patience and helpful attitudes through multiple calls. I feel like we were able to narrow it down to what worked for me and my family. My system works great and I couldn't be happier to have picked Portlandia Electric Supply.

Patrick B

Off Grid Solar Purchase

I wanted to get an offgrid solar system for years but didn’t know where to start. I found Portlandia Electric Supply on Facebook and decided to submit a quote. Within 24 hours I had a custom proposal that was almost half the price of the companies I had previously got quotes from. My wife and I decided to order online and the kit came in a timely manner and it was an easy install. Great company to work with!

James Martin

Highly Recommend

I would like to take the time to express the outstanding service that I was provided with by Portlandia Electric Supply. They provided me with all the answers to my questions, and after reviewing our quote over the phone I felt comfortable proceeding to order my kit. It’s exactly what I needed and they were there to help us over the phone when we had questions installing it. I highly recommend others in need to choose Portlandia Electric Supply.

Brian H

Solar Kit for Mobile Work Van

As a professional videographer, I needed reliable power on the go.Portlandia Electric Supply Delta Pro and roof-mounted panels were the perfect solution. Setup was easy, and the kit included everything needed. The Delta Pro powers my cameras, lights, laptop, and a small fridge with impressive battery capacity.

Keith S

Best Tech Support

You folks have been wonderful guiding me through the ins and outs of going solar. Plus your tech guys Rod and Nelson are the absolute best. They explained all the different aspects of inverters, batteries and how to keep them in top condition. Too much more to put here… but no other company has the 100% tech support you provide for your customers!

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Great Experience

My experience with Portlandia Electric Supply has been excellent. Before the sales, they answered all my questions to assure that I got what I needed. After the sales they continued to support me with answers and help. I had a warranty issue with a unit, and it was handled as well as possible. I would recommend them to anyone looking to go solar.

Troy P

EG4 off-grid base kit, Happy with my purchase.

Jacob B

Easy Process, Genuine Support

Patrick B

Off Grid Solar Purchase

James Martin

Highly Recommend

Brian H

Solar Kit for Mobile Work Van

Keith S

Best Tech Support

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