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Briggs and Stratton Simpliphi PHI 3.8 LFP Battery, 24V- METAL-052003 PHI-3.8-24-M

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SKU PES-ESS-BTS-0266

Briggs and Stratton Simpliphi PHI 3.8 LFP Battery, 24V- METAL-052003 PHI-3.8-24-M

$2,572.07 USD

$ $2,572.07 USD

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9+ sold

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What is your return policy?

Returns are free in the first 30 days with no restocking or processing fees, although the customer may be responsible for paying return shipping. See our complete return policy on our Shipping, Delivery, and Returns page linked in the footer of this website.

What’s covered by your return policy?

Our returns policy covers all purchases made through Portlandia Electric Supply. For warranty issues, as authorized distributors, we honor the full manufacturer warranty of ALL the brands on our website. See our complete returns and warranty policies on our Shipping, Deliver, and Returns page.

How long will it take to receive my order?

All orders are processed within 72 hours and you can expect delivery on most orders within 5-7 business days. You will receive access to our customer portal after ordering, where it is easy to track all your shipments. See our Shipping, Delivery and Returns page for more details.

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?

Our legendary lifetime customer support has helped make us the #1 online solar retailer! We have a dedicated team of solar professionals standing by to help you navigate the world of solar with ease. From selecting the perfect solar kit to installation and beyond, we provide support and expertise at every step of the journey.If you need help with ordering, shipping, troubleshooting, expanding your system, warranty issues, or anything else you have questions about for as long as you own your Portlandia Electric Supply equipment, we’ve got you covered: we’re always only a phone call or email away.

PHI 3.8-24V-M 3.8kWh LiFePO₄ Battery, 25.6V 151Ah, 98% Efficiency, 10,000+ Cycles, 10-Year Warranty

The Briggs and Stratton Simpliphi PHI 3.8 LFP Battery is a premium lithium iron phosphate battery designed for reliability, safety, and sustained performance. This energy storage system delivers consistent power in residential and light commercial settings, making it an excellent choice for off-grid, backup, or hybrid power users.

Utilizing advanced lithium iron phosphate (LFP) chemistry, this battery improves thermal stability, extends cycle life, and offers enhanced safety over traditional battery types. The PHI 3.8 LFP Battery by Briggs and Stratton Simpliphi, 24V METAL-052003 PHI-3.8-24-M is enclosed in a durable metal housing, built to withstand tough operating conditions.

The SimpliPhi / Briggs & Stratton PHI-3.8-24V-M is a 3.8 kWh, 24 V LiFePO₄ module with integrated BMS and an accessible DC breaker. It is compatible with standard inverters and charge controllers for off-grid, backup, and self-consumption use cases.

Electrical
Chemistry	Lithium Ferro Phosphate (LFP)
Nominal Voltage	25.6 V DC
Capacity	151 Ah
Rated Energy	3.8 kWh DC @ 100% DoD; 3.04 kWh DC @ 80% DoD
Max Discharge (10 min)	60 A DC (≈1.53 kW DC)
Max Continuous Discharge	45 A DC (≈1.15 kW DC)
Max Continuous Charge	45 A DC (≈1.15 kW DC)
DC Voltage Range	24–28 V DC
Depth of Discharge	Up to 100%
Operating Efficiency	98%
Environmental
Charging Temperature	32–120 °F (0–49 °C)
Operating Temperature	−4–140 °F (−20–60 °C)
Storage Temperature	6 months: 14–77 °F (−10–25 °C); 3 months: −4–113 °F (−20–45 °C)
Self-Discharge	<1% per month
Cycle Life	10,000+ (at 80% DoD)
Mechanical
Weight	78.24 lb (35.5 kg)
Dimensions (W×H×D)	13.5 × 14 × 8 in (15.5 in H with terminals) / 0.88 ft³
Terminals / Cable	3/8 in (10 mm) / 6 AWG minimum
Protection & Controls
BMS	Built-in Battery Management System
OCPD / Breaker	Built-in, accessible 80 A DC breaker On/Off switch
Short-Circuit Limits	80 A (continuous breaker); 200 A (1 s); 400 A (100 µs); 550 A (10 µs)
Charging Settings (Guidance)
Bulk & Absorb Voltage	27.2 V DC (Absorb time 1 hr)
Float Voltage	27.0 V DC (Charge controllers)
Inverter Charging	2-stage, no float; Equalization: none; Temp compensation: none
Compliance
Certifications	UL 1973 (battery), UL/CE/UN/DOT/RoHS compliant components
UN Number	UN 3480 (Lithium-ion batteries)
Warranty	10 years or 10,000 cycles (at 80% DoD)

All specifications above are taken from the official PHI-3.8 specification sheet (Rev. 20210628). For current marketing copy and imagery, see the manufacturer product page linked under Documents.

Why Choose Simpliphi PHI 3.8 LFP Battery?

Selecting the right energy storage solution is essential for reliable power and long-term cost savings. The design of this lithium iron phosphate battery stands out for efficiency and proven reliability in many applications.

It supports solar arrays, backup power, and off-grid power systems. The 24V design fits with many power setups, supplying steady voltage and dependable output. Its maintenance-free operation eliminates routine checks, offering practical benefits for homeowners and professionals.

Key Features of the PHI 3.8 LFP Battery

This battery includes advanced features for long-lasting reliability and safety:

Lithium Iron Phosphate Chemistry: Provides strong thermal stability and reduces overheating risk.
Long Cycle Life: Designed for thousands of charge/discharge cycles with minimal loss.
Metal Enclosure: Enhances protection from physical and environmental damage.
High Energy Density: Offers more usable energy in a smaller footprint.
Maintenance-Free Design: No watering, corrosion, or regular servicing needed.

These features ensure the battery performs well where reliability and efficiency matter most.

Applications and Use Cases

This battery is versatile for many uses. It is widely used in solar energy storage to keep excess power for night use or grid outages. It performs stably in off-grid cabins, remote locations, and backup power installations.

Commercial users rely on it to protect critical loads and prevent downtime during power disruptions. Its consistent power helps safeguard sensitive equipment from voltage surges and unplanned outages.

Safety, Efficiency, and Performance of Briggs and Stratton Simpliphi PHI 3.8 LFP Battery

Safety is a major benefit of this lithium iron phosphate battery. The LFP chemistry lowers the chance of fire or explosion compared to other lithium batteries. Built-in battery management systems monitor voltage, temperature, and system performance for optimal operation.

Efficiency is also key. The battery achieves high charge and discharge efficiency. This reduces energy loss and increases available power, resulting in lower costs and better system function.

Installation and Compatibility

Designed for easy installation, the standard 24V setup works with many inverters and energy controllers. The metal case supports flexible mounting while ensuring strong protection.

Suitable for indoor or sheltered outdoor installations, it operates reliably with minimum complexity. Installers find its modular build ideal for scaling energy systems.

Long-Term Value and Sustainability with Briggs and Stratton Simpliphi PHI 3.8 LFP Battery

Investing in this battery delivers lasting value. Its lifespan reduces replacement frequency, and efficient performance promotes sustainable energy use. It helps cut reliance on fossil fuels and supports energy independence for a greener future.

With durability, safety features, and dependable output, the Briggs and Stratton Simpliphi PHI 3.8 LFP Battery is an excellent choice for reliable energy storage.

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?

PHI 3.8-24V-M 3.8kWh LiFePO₄ Battery, 25.6V 151Ah, 98% Efficiency, 10,000+ Cycles, 10-Year Warranty

Electrical
Chemistry	Lithium Ferro Phosphate (LFP)
Nominal Voltage	25.6 V DC
Capacity	151 Ah
Rated Energy	3.8 kWh DC @ 100% DoD; 3.04 kWh DC @ 80% DoD
Max Discharge (10 min)	60 A DC (≈1.53 kW DC)
Max Continuous Discharge	45 A DC (≈1.15 kW DC)
Max Continuous Charge	45 A DC (≈1.15 kW DC)
DC Voltage Range	24–28 V DC
Depth of Discharge	Up to 100%
Operating Efficiency	98%
Environmental
Charging Temperature	32–120 °F (0–49 °C)
Operating Temperature	−4–140 °F (−20–60 °C)
Storage Temperature	6 months: 14–77 °F (−10–25 °C); 3 months: −4–113 °F (−20–45 °C)
Self-Discharge	<1% per month
Cycle Life	10,000+ (at 80% DoD)
Mechanical
Weight	78.24 lb (35.5 kg)
Dimensions (W×H×D)	13.5 × 14 × 8 in (15.5 in H with terminals) / 0.88 ft³
Terminals / Cable	3/8 in (10 mm) / 6 AWG minimum
Protection & Controls
BMS	Built-in Battery Management System
OCPD / Breaker	Built-in, accessible 80 A DC breaker On/Off switch
Short-Circuit Limits	80 A (continuous breaker); 200 A (1 s); 400 A (100 µs); 550 A (10 µs)
Charging Settings (Guidance)
Bulk & Absorb Voltage	27.2 V DC (Absorb time 1 hr)
Float Voltage	27.0 V DC (Charge controllers)
Inverter Charging	2-stage, no float; Equalization: none; Temp compensation: none
Compliance
Certifications	UL 1973 (battery), UL/CE/UN/DOT/RoHS compliant components
UN Number	UN 3480 (Lithium-ion batteries)
Warranty	10 years or 10,000 cycles (at 80% DoD)

All specifications above are taken from the official PHI-3.8 specification sheet (Rev. 20210628). For current marketing copy and imagery, see the manufacturer product page linked under Documents.

Why Choose Simpliphi PHI 3.8 LFP Battery?

Key Features of the PHI 3.8 LFP Battery

This battery includes advanced features for long-lasting reliability and safety:

Lithium Iron Phosphate Chemistry: Provides strong thermal stability and reduces overheating risk.
Long Cycle Life: Designed for thousands of charge/discharge cycles with minimal loss.
Metal Enclosure: Enhances protection from physical and environmental damage.
High Energy Density: Offers more usable energy in a smaller footprint.
Maintenance-Free Design: No watering, corrosion, or regular servicing needed.

These features ensure the battery performs well where reliability and efficiency matter most.

Applications and Use Cases

Safety, Efficiency, and Performance of Briggs and Stratton Simpliphi PHI 3.8 LFP Battery

Efficiency is also key. The battery achieves high charge and discharge efficiency. This reduces energy loss and increases available power, resulting in lower costs and better system function.

Installation and Compatibility

Designed for easy installation, the standard 24V setup works with many inverters and energy controllers. The metal case supports flexible mounting while ensuring strong protection.

Suitable for indoor or sheltered outdoor installations, it operates reliably with minimum complexity. Installers find its modular build ideal for scaling energy systems.

Long-Term Value and Sustainability with Briggs and Stratton Simpliphi PHI 3.8 LFP Battery

With durability, safety features, and dependable output, the Briggs and Stratton Simpliphi PHI 3.8 LFP Battery is an excellent choice for reliable energy storage.

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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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