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FoxESS Master LFP Stakable Batteries with full capacity 3.975kWh - CM4000 ( 30-218-10103-00 )

FoxESS Master LFP Stakable Batteries with full capacity 3.975kWh - CM4000 ( 30-218-10103-00 ) | Portlandia Electric Supply

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FoxESS Master LFP Stakable Batteries with full capacity 3.975kWh - CM4000 ( 30-218-10103-00 )

$2,083.00 USD

$ $2,083.00 USD

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FoxESS CM4000 master battery — 3.97 kWh high-voltage LFP module

FoxESS Master LFP Stakable Batteries - CM4000 are engineered to deliver reliable, scalable, and high-performance energy storage for modern residential and light commercial power systems. Designed with advanced lithium iron phosphate (LFP) technology, these batteries ensure safety, longevity, and consistent output, making them a smart investment for anyone looking to optimize energy usage and backup power efficiency.

The FoxESS Master LFP Stakable Batteries with full capacity 3.975kWh - CM4000 ( 30-218-10103-00 ) provide a future-ready solution where performance, modular flexibility, and durability come together in one compact system.

FoxESS CM4000 master battery is the controller + battery module of the ECS4000 stack. The nominal energy of this single module is 3.97 kWh; to make a complete stack, it is paired in series with CS4000 slave modules (max 1 CM + 6 CS, up to 27.8 kWh). ^{[datasheet/manual]}

Key features

FoxESS CM4000 master battery offers plug-and-play stack design, CAN BMS comms, outdoor-rated IP65 enclosure, >95% round-trip efficiency, and ≥6000 cycles @ 90% DoD—for clean, code-friendly installs with H1 hybrid inverters. ^{[datasheet/manual]}

Energy: 3.97 kWh (57.6 V, 69 Ah) · Voltage range 48.6–65.7 V
Current: 50 A charge/discharge (continuous), 65 A peak (60 s)
Scalable stacks (ECS4000-H2…H7): 7.95–27.8 kWh · 115.2–403.2 V nominal
Ingress: IP65 · Operating temp: charge 0–55 °C, discharge −10–55 °C
Certifications: UL1973, UL9540, UL9540A; UN38.3 transport

Specifications

**FoxESS CM4000 master battery** — specification box
Module (CM4000)
Chemistry	LiFePO₄ prismatic cells
Nominal energy / voltage / capacity	3.97 kWh · 57.6 V · 69 Ah
Voltage range	48.6–65.7 V
Charge / discharge current	50 A continuous · 65 A (60 s) peak
Round-trip efficiency	>95%
Depth of discharge	90% (typ.)
Cycle life	≥6000 cycles @ 25 °C, 90% DoD
Ingress / environment	IP65 · −10 to 55 °C (discharge); 0 to 55 °C (charge)
Dimensions (L × W × H)	570 × 380 × 170 mm (≈22.44″ × 14.96″ × 6.69″)
Weight	≈39 kg (≈86 lb)
Interfaces	CAN BMS; LED status (SOC/Alarm/Run), DC switches
Compliance	UL1973 · UL9540 · UL9540A · UN38.3
System (ECS4000 stack examples)
H2 (1 CM + 1 CS)	7.95 kWh · 115.2 V (97.2–131.4 V)
H3 (1 CM + 2 CS)	11.92 kWh · 172.8 V (145.8–197.1 V)
H4 (1 CM + 3 CS)	15.90 kWh · 230.4 V (194.4–262.8 V)
H5 (1 CM + 4 CS)	19.87 kWh · 288 V (243–328.5 V)
H6/H7	23.85 / 27.82 kWh · 345.6 / 403.2 V (US market usually ≤ H5)

For residential backup, TOU shifting, or hybrid PV systems, the FoxESS CM4000 master battery provides a rugged, scalable foundation—future expansion is simple with CS4000 modules.

Key Features of FoxESS Master LFP Stakable Batteries - CM4000

High Usable Capacity and Efficiency

Each unit delivers a full usable capacity of 3.975kWh, ensuring minimal energy loss and maximum efficiency. This makes the FoxESS Master LFP Stakable Batteries - CM4000 ideal for solar self-consumption, energy shifting, and backup applications.

Scalable Stakable Design

The stakable design allows multiple battery modules to be connected vertically, saving floor space while increasing overall energy storage. Whether you need backup power for a small home or energy support for a commercial setup, the system scales effortlessly.

Long Cycle Life

Thanks to LFP cell technology, these batteries support thousands of charge and discharge cycles with minimal degradation. This ensures long-term reliability and lower cost of ownership over time.

Smart Battery Management System (BMS)

An integrated BMS continuously monitors voltage, temperature, and current to optimize performance and protect the system. The BMS enhances safety while ensuring balanced charging across all connected modules.

Why Choose FoxESS Master LFP Stakable Batteries - CM4000?

The FoxESS Master LFP Stakable Batteries - CM4000 are designed for users who demand reliability, efficiency, and flexibility. Their full-capacity utilization ensures that every stored unit of energy is effectively used. With high compatibility across modern hybrid and off-grid systems, these batteries integrate seamlessly into existing energy setups.

Their compact footprint and vertical stacking capability make them suitable for installations where space is limited. Additionally, the robust enclosure design protects internal components, ensuring dependable operation even in demanding environments.

Applications of FoxESS Master LFP Stakable Batteries - CM4000

Residential solar energy storage
Backup power systems
Peak load management
Off-grid and hybrid installations
Light commercial energy solutions

By using FoxESS Master LFP Stakable Batteries - CM4000, users can reduce grid dependency, improve energy independence, and maintain power continuity during outages.

Safety and Reliability You Can Trust

Safety is a core advantage of the FoxESS Master LFP Stakable Batteries - CM4000. LFP chemistry offers superior resistance to thermal runaway, while the advanced BMS ensures real-time protection against overcharging, deep discharge, and short circuits. This makes the system suitable for long-term, worry-free operation.

Future-Ready Energy Storage Solution

As energy needs grow, the FoxESS Master LFP Stakable Batteries - CM4000 remain adaptable. Their modular design ensures that expanding storage capacity is simple and cost-effective. This future-ready approach makes them an excellent choice for evolving energy infrastructures.

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 CM4000 master battery — 3.97 kWh high-voltage LFP module

Key features

Energy: 3.97 kWh (57.6 V, 69 Ah) · Voltage range 48.6–65.7 V
Current: 50 A charge/discharge (continuous), 65 A peak (60 s)
Scalable stacks (ECS4000-H2…H7): 7.95–27.8 kWh · 115.2–403.2 V nominal
Ingress: IP65 · Operating temp: charge 0–55 °C, discharge −10–55 °C
Certifications: UL1973, UL9540, UL9540A; UN38.3 transport

Specifications

**FoxESS CM4000 master battery** — specification box
Module (CM4000)
Chemistry	LiFePO₄ prismatic cells
Nominal energy / voltage / capacity	3.97 kWh · 57.6 V · 69 Ah
Voltage range	48.6–65.7 V
Charge / discharge current	50 A continuous · 65 A (60 s) peak
Round-trip efficiency	>95%
Depth of discharge	90% (typ.)
Cycle life	≥6000 cycles @ 25 °C, 90% DoD
Ingress / environment	IP65 · −10 to 55 °C (discharge); 0 to 55 °C (charge)
Dimensions (L × W × H)	570 × 380 × 170 mm (≈22.44″ × 14.96″ × 6.69″)
Weight	≈39 kg (≈86 lb)
Interfaces	CAN BMS; LED status (SOC/Alarm/Run), DC switches
Compliance	UL1973 · UL9540 · UL9540A · UN38.3
System (ECS4000 stack examples)
H2 (1 CM + 1 CS)	7.95 kWh · 115.2 V (97.2–131.4 V)
H3 (1 CM + 2 CS)	11.92 kWh · 172.8 V (145.8–197.1 V)
H4 (1 CM + 3 CS)	15.90 kWh · 230.4 V (194.4–262.8 V)
H5 (1 CM + 4 CS)	19.87 kWh · 288 V (243–328.5 V)
H6/H7	23.85 / 27.82 kWh · 345.6 / 403.2 V (US market usually ≤ H5)

For residential backup, TOU shifting, or hybrid PV systems, the FoxESS CM4000 master battery provides a rugged, scalable foundation—future expansion is simple with CS4000 modules.

Key Features of FoxESS Master LFP Stakable Batteries - CM4000

High Usable Capacity and Efficiency

Scalable Stakable Design

Long Cycle Life

Thanks to LFP cell technology, these batteries support thousands of charge and discharge cycles with minimal degradation. This ensures long-term reliability and lower cost of ownership over time.

Smart Battery Management System (BMS)

Why Choose FoxESS Master LFP Stakable Batteries - CM4000?

Applications of FoxESS Master LFP Stakable Batteries - CM4000

Residential solar energy storage
Backup power systems
Peak load management
Off-grid and hybrid installations
Light commercial energy solutions

By using FoxESS Master LFP Stakable Batteries - CM4000, users can reduce grid dependency, improve energy independence, and maintain power continuity during outages.

Safety and Reliability You Can Trust

Future-Ready Energy Storage Solution

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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

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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

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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

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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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