FORCE 15K - 8,000W 120/240V Output + 15kWh Lithium Power Station | 4,0 -
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FORCE 15K - 8,000W 120/240V Output + 15kWh Lithium Power Station | 4,000W Solar Input | Made In America | 10-Year Warranty | Choose Bundle - Free Shipping [Early Bird Deposit] *Ships in 6-8 Weeks*

Save $1000
$150 Deposit (Remaining Balance of $5,749 due in 30 days)
$150 Deposit (Remaining Balance of $7,339 due in 30 days)
$150 Deposit (Remaining Balance of $7,839 due in 30 days)
$150 Deposit (Remaining Balance of $8,839 due in 30 days)

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Friendly Phone Support:  877-242-2792

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Secure Your Force 15k Energy Storage System Today!

In a breakthrough move for 2024, we present the FORCE 15K – the inaugural lithium iron phosphate power station by Mammoth RE that genuinely powers your entire home or off-grid property. Boasting more capacity than 4 x Bluetti AC300's and 15% more capacity than a Tesla Powerwall, all at a remarkable 50% of the cost.

Triggered by an overwhelming response from our customers and a deep dive into existing products, we discovered a gaping hole in the market. Enter the FORCE 15K – born out of your requests, submissions, and support calls. We've taken everything there is to love about power stations and obliterated the issues: limited capacity, restrained power output, and unnecessary complexity. Unlike other units that claim to power your entire house with one unit but fall short in reality, the FORCE 15K is here to close that gap.

Your All-In-One Power Solution

Your All-In-One Power Solution

The FORCE 15K isn't just a power station; it's your personal energy powerhouse. Whether you're at home, on the road, or off the grid, it's the key to unlocking limitless power.

Reliable Backup Power In Every Situation

Reliable Backup Power In Every Situation

Never be in the dark again. The FORCE 15K provides a dependable backup power source during outages or emergencies, ensuring your essential devices stay powered.

Freedom to Live Off The Grid

Freedom to Live Off The Grid

Experience off-grid living like never before. The FORCE 15K empowers your adventures, making camping or living off the grid a breeze with its self-sustaining power solution.

Whisper-Quiet Operation for Total Peace of Mind

Whisper-Quiet Operation for Total Peace of Mind

Enjoy the tranquility. Unlike traditional generators, the FORCE 15K operates silently, ensuring a peaceful environment wherever you are.

What's Included:

  • Ships from USA!

  • 1 x FORCE 15K ESS - 15,000wH / 8,000W Power Station

  • 1 x PV to Anderson SB175 Solar Panel Connector Cable

  • 1 x 120V AC Wall Charger (11A / 87V) 900W Input

  • 1 x NEMA14 50P to SS2-50R 240V Cable (Green & Black) Waterproof

  • 1 x User Manual & Setup Guide

  • FREE Shipping!

  • Lifetime Customer Support (Email, Live Chat & Phone)

Product Specifications:

FORCE 15K ESS Specifications
Inverter Power (KW) 8,000W 120/240V Output
Inverter Surge Power 16,000W / 16KW
Inverter Type Pure Sine Wave
Inverter Efficiency Rating 97%
Battery Capacity (kWh) 15kWh LFP (15,000 Watt Hours)
Dimensions L 25 inches W 15 inches H 40 inches
Total Weight 395 lbs
Top Weight 165 lbs
Bottom Weight 230 lbs
PV Connector SB175 to PV Connectors
PV Input Voltage 90VDC-230VDC (Open Circuit Voltage)
PV Input Max Current 80 Amps
PV Input Watts 4,000W
PV Input Technology MPPT
PV Charging Voltage < 56VDC
DC Port Input Voltage Range (For Battery Parallel) 48VDC to 55.5VDC,BE175
AC Output Breaker Capacity N/A
AC Input Breaker Capacity 63 Amps
AC Input Voltage Range 120VAC to 250VAC (2 hot wire , 1 neutral wire , 1 Gound)
AC Wall Charger (Input Ratings) 11A * 83V (900 Watts)
AC Input Connector (on the side) NEMA SS2-50P (120VAC/240VAC , 50Amp)
AC Output Receptacal (on the side) NEMA 14-50R (120VAC/240VAC , 50Amp)
AC Output Receptacal (on front panel) 6 x 120V Receptacle , 1 x L14-30R (120VAC/240VAC , 30Amp)
Time of Use AC Charge Settings Yes
USB Port 4x USB A , 4x USB Type C
Idle Consumption 45W
Power Ports 120V / 240V / 30A / 50A / USB / USB-C
Self-Serviceable Yes
Communication Ports 1x CanBus , 1x RS485, 1x Generatior kick off port , WiFi
Warranty 10-Years

The Best Bang For Your Buck All-In-One Power Station Money Can Buy

Plug-and-Play Simplicity

Experience true ease with the FORCE 15K comes with plug-and-play brilliance. Seamlessly connect your solar panels and plug them directly into the unit – that's all it takes to unleash a fully functional off-grid solar power system. No need for complex installations or technical expertise; the FORCE 15K is engineered for straightforward operation, putting the power of energy independence at your fingertips.

Versatile Power Outlets

What sets the FORCE 15K apart is its versatility in power output. Equipped with built-in 30A and 50A plugs, connecting it to anything is a breeze. Whether you're powering essential appliances in your home, your RV, or your construction site, the FORCE 15K adapts effortlessly to your needs.

Built-In Split Phase Output

A unique feature that defines the FORCE 15K is its built-in split-phase output. Uncommon in products of its kind, this design ensures a seamless distribution of power, catering to a variety of applications. From powering delicate electronics to handling heavy-duty equipment, the FORCE 15K delivers 8,000W of consistent and reliable energy output at either 120V or 240V.

10-Year Warranty

We stand behind the FORCE 15K with confidence, offering an industry-leading 10-year warranty. This commitment goes beyond the norm, reflecting our trust in the system's durability and reliability. With a warranty that surpasses others in the market, you can invest in the FORCE 15K with the assurance that it's built to last.

Unbeatable Affordability

The FORCE 15K doesn't just stand out for its power – it's your smart, wallet-friendly choice. We're proud to have developed a solution that is easily 20% more affordable than any other comparable option on the market. The FORCE 15K is the embodiment of value, where top-notch energy meets real-world affordability.

Sleek Aesthetics

Not just a powerhouse but a design statement – the FORCE 15K comes in black and gunmetal gray colors that exude sophistication and style. Whether placed in your home, office, or garage, its sleek appearance adds a touch of elegance to any environment.

1. What are the key dates for the launch of the Force 15k?

  • January 5th, Force 15k launches!
  • January 15th, First units begin assembly
  • Mid March, First batch of units begin shipping
  • Late March, Second early bird sale starts!
  • Early May, Second batch of units start shipping.

*Each batch is 100 units.

2. How does the deposit & early bird pricing work?

By putting down a $150 deposit today, you will reserve the right to secure a FORCE 15K at an exclusive early bird price of $5,899, a whopping $1,000 off the standard retail price of $6,899—reserved for early bird customers only by putting down a $150 deposit today!

You’ll need to act fast since once the first batch of units are claimed, the price will jump to the standard MSRP of $6,899 so reserve your early bird price of $5,899 today by putting down a $150 deposit now!

*The remaining amount will be due in full 2-weeks prior to the units being ready to ship or once all 100 initial units have been claimed!

*Early Bird Pricing - Save $1,000 Today*

  • Quad Kit - $7,489
  • Hex Kit - $7,989
  • Platinum Kit - $8,989
  • Main Unit Only - $5,899

3. When will I receive my unit?

If your order was placed between January 5th and February 12th, your Force 15k will ship in March 2024.

If your order was placed between February 13th, 2024 - March 13th you can expect your Force 15k to be delivered in early May, 2024.

If your order was placed after March 15th you can expect your Force 15K to be delivered in late May 2024.

4. Is the Force 15k UL Listed?

The Force 15K ESS is not UL Listed as this is not required for off-grid applications, portable power stations and solar generators. You will not be selling excess power back to the grid with a unit like this, you will be securing your energy independence and investing in a clean, quiet, reliable source of power for years to come.

5. How does the warranty work?

Each unit is backed by a standard 10-year manufacturer warranty from the date of shipment. The average lifespan of a lithium battery at 90% Depth of Discharge is between 3,000 – 6,000 lifecycles or roughly 5 to 10 years of standard daily use (many more years if used only in backup and recreational situations).

This warranty does not cover negligence or misuse of the battery or the normal wear and tear. If it is deemed that the battery was used improperly, you will be subject to a $150 an hour repair charge plus parts and shipping.

To submit a warranty claim, please contact us directly at The battery may be required to be shipped back to one of our US warehouse locations for further inspection.

6. How heavy is the unit?

The unit weighs a total of 395 lbs, however to make moving it easier, we have designed a 2-piece system where you can remove the top inverter portion from the bottom battery portion.

The top weighs approximately 165 lbs, the bottom piece weighs 230 lbs and has wheels for easy maneuverability.

7. How does the top connect to the bottom?

The top and bottom are held together with screw-on plates on either side of the unit and connect via a standard SB175 cable which you can see in the product images.

8. How quickly can it recharge?

You can recharge the unit from 0-100% with up to 4,000W of solar panels in approximately 4 hours. You can also use both 240V and 120V AC power to recharge the unit. 

240V power will recharge the unit much faster than the 120V wall charger included with your order, but we highly recommend “slow” charging the unit from AC power whenever possible to preserve the longevity of the battery.

You can recharge the unit from solar and AC power at the same time.

9. What is the continuous AC output?

The continuous AC output of the unit is 8,000W at either 120V or 240V. Most appliances you will be running are 120V however things like well pumps, dryers, and some larger AC units require 240V output which the Force 15K can easily handle.

10. How quiet is the Force 15K?

The FORCE 15K Solar Power Station operates at an impressive 50 decibels during both standard operation and charging, ensuring a remarkably quiet environment. Multiple decibel rating reports reveals that, even at peak output, it maintains a range of 75-85 decibels—very comparable to the quiet performance of many solar generators and power stations on the market today.