Home DC-DC Chargers 12V 40A DC-DC with MPPT

surface of litime 12v 40a dc to dc battery charger

LiTime 12V 40A DC to DC battery charger in horizontal and vertical orientations, with recommended mounting directions

LiTime 12V 40A DC to DC battery charger connections: ACC wire, output terminal, solar input, and DC input terminal

protection information of litime 40a dc to dc battery charger with mppt

LiTime 12V 40A charger with LED indicator and operation button, retaining settings even when power is disconnected

litime 12v 40a dc to dc charger compatible with multiple battery types

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Features

LiTime 12V 40A DC to DC Battery Charger with MPPT

Q: What is a DC-DC charger, and why do I need it?

A DC-DC charger allows you to safely charge a leisure battery from your vehicle's alternator while protecting both the alternator and batteries. It ensures efficient charging, especially in setups with lithium batteries.

Q: What type of alternator is this DC to DC on board battery charger compatible with?

This battery charger is designed to work with both conventional and smart alternators. However, because conventional alternators maintain a consistent voltage during charging, while smart alternators adjust their charging output based on operating conditions, it is necessary to connect the charger to the smart alternator using the IGN Signal Wire provided with the package through the Vehicle Ignition Port.

Q: What types of battery does the charger support?

It’s compatible with 12V Lithium, Gel, AGM, and Calcium batteries, providing a full 100% charge for each type. Additionally, it can jump start lithium batteries that have been discharged to low voltage levels.

Q: What will happen if the service battery is fully charged?

The LiTime DC to DC Battery Charger with solar input, incorporates a Voltage Sensitive Relay (VSR). This feature enables the charger to perform Trickle Charging for the service battery, preserving its full charge, as well as to perform Trickle Charging for the starting battery using solar panels. Additionally, the VSR guarantees dependable isolation between the starting battery and service battery, preventing any charging interference.

Q: Can I use this DC-DC charger while driving?

Absolutely. This DC-DC charger is designed to work while the vehicle is running, providing continuous charging to your secondary battery from the alternator.

Q: How does this charger handle temperature variations?

The charger includes a temperature sensor to adjust charging based on ambient temperatures, optimizing charging and protecting batteries in both hot and cold conditions.

$199.99

$249.99

- 20.00 %

【Compatibility】Multiple Options For Charging 12V Batteries. Fit for 12V Lithium, Gel, AGM, and Calcium batteries and allows the batteries to be charged 100%. Also, it can activate the dead lithium batteries at low voltage.

【Max. 600W Solar Input & 40A Current Output】Equipped with an ACC wire, a solar input terminal, a DC input terminal, and an output terminal to enhance the operational efficiency of the solar, alternator, starting battery, and service battery.

【Intelligent Charging Protection】Overvoltage input protection, output reverse connection protection, battery overvoltage protection, over temperature protection, charging timeout protection, and BMS protection (for LFP battery).

【Easily Operating】Simple and straightforward operation instructions with LED indicator and operation buttons, users only need to choose the suitable battery type for your battery, then let the DC-DC charger do the charging.

【Reverse Charging】When the starting battery voltage is between 3-12V and the living battery voltage is greater than 12.5V, press and hold "REVERSE CHARGE" for 3 seconds to start reverse charging. It is recommended to start the battery when the voltage is greater than 13V and exit reverse charging when the charging current is less than 10A or the voltage of the domestic battery is less than 11V.

Note: Use the included screws (Φ15/64'' [6mm], 15/32'' [12mm]) for secure mounting to prevent installation failure or product damage.

Comparison

Quantity:

$199.99

$249.99

- 20.00 %

2-Year Warranty

Backed up by techical support within 24hrs.

Free Shipping

Free standard shipping on all orders.
Delivered in 2–5 business days.

Free Returns

30 Days Hassle Free Returns

12V 40A DC-DC with MPPT

$199.99

$249.99

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Features

Specs

FAQ

Reviews

Multiple Options for Charging 12V Batteries

The LiTime 12V 40A DC to DC Battery Charger offers versatile charging options for various battery types, ensuring compatibility and optimal performance. This charger is designed to meet the specific charging requirements of different battery chemistries, making it an essential tool for any battery setup. Before using the DC-DC charger to recharge your batteries, please select the correct battery type. It is essential to confirm the charging requirements with your battery manufacturer to ensure safe and effective charging. With the LiTime DC-DC Battery Charger, you can confidently maintain and recharge your 12V batteries across a variety of applications!

LiTime 12V 40A DC to DC charger with MPPT, supporting LiFePO4, lead acid, GEL/AGM, and calcium batteries

Recommended Cable Sizing & Fusing

To ensure optimal performance and safety when using the LiTime 12V 40A DC to DC Battery Charger, it is essential to follow the recommended cable sizing and fusing guidelines.

recommended cable sizing and fusing of litime litime 40A dc to dc charger

Always Keep the Power On the Go

With the LiTime 12V 40A DC to DC Battery Charger, you can ensure that your power needs are met wherever you are. This system is designed for versatility, allowing for two charging sources to keep your service battery charged and ready for use.

diagram of litime dc to dc 40a charger with solar input

SPECS

BASIC

System Nominal Voltage：

12V

Battery Type：

SLA, AGM, GEL, CA, LI

Charging Current：

40A

Charging Efficiency：

Up to 93%

Charging Voltage Range：

7V to 15.4V

Max. Alternator Input Power：

600W

Standby Self-Consumption：

<10mA

Humidity：

0%~90%

Max. Solar Input Power/Voltage：

600W/30V

Min. Solar Input Voltage：

10V

DIMENSIONS

Size：

5.83*1.89*7.44 inch

Approx. Weight：

2.43lbs

TEMPERATURE

Operating：

-10°C to 45°C/-14'F to 113°F

Storage：

-20°C to 65°C/-4°F to 149°F

FAQ

What is a DC-DC charger, and why do I need it?

A DC-DC charger allows you to safely charge a leisure battery from your vehicle's alternator while protecting both the alternator and batteries. It ensures efficient charging, especially in setups with lithium batteries.

What type of alternator is this DC to DC on board battery charger compatible with?

This battery charger is designed to work with both conventional and smart alternators. However, because conventional alternators maintain a consistent voltage during charging, while smart alternators adjust their charging output based on operating conditions, it is necessary to connect the charger to the smart alternator using the IGN Signal Wire provided with the package through the Vehicle Ignition Port.

What types of battery does the charger support?

It’s compatible with 12V Lithium, Gel, AGM, and Calcium batteries, providing a full 100% charge for each type. Additionally, it can jump start lithium batteries that have been discharged to low voltage levels.

What will happen if the service battery is fully charged?

The LiTime DC to DC Battery Charger with solar input, incorporates a Voltage Sensitive Relay (VSR). This feature enables the charger to perform Trickle Charging for the service battery, preserving its full charge, as well as to perform Trickle Charging for the starting battery using solar panels. Additionally, the VSR guarantees dependable isolation between the starting battery and service battery, preventing any charging interference.

Can I use this DC-DC charger while driving?

Absolutely. This DC-DC charger is designed to work while the vehicle is running, providing continuous charging to your secondary battery from the alternator.

How does this charger handle temperature variations?

The charger includes a temperature sensor to adjust charging based on ambient temperatures, optimizing charging and protecting batteries in both hot and cold conditions.

REVIEWS

Works great

Would be nice to have bluetooth to see stats and higher solar input voltage, but great otherwise.

12V 40A DC to DC Battery Charger with MPPT

Charger was installed in a RAM 3500 pickup with two parallel connected LI 12V 100AH Batteries using #8 gage wire, providing power to a 12V refridgerator. It operated well for the first few weeks. Then it failed to charge the batteries. When it is turned on, it charges for a few seconds, then the 60A circuit breaker on the input connected to the vehicle battery trips. Wendy at LI Time was very helpful with providing possible solutions to investigate. Turns out, the 60A circuit breaker I mounted in the engine compartment was tripping at 45A. It may have been damaged by the heat in the engine compartment. I installed a new 60A breaker inside the vehicle. Charger has been operating well.

All in one8

This simplified my electric install on my van by combining the dc to dc (charge while I drive) with the mppt (charge with panels while I'm parked) it saved me time and money by not having to buy and hook up a separate charge controler. We'll worth the money AWESOME PRODUCT, a must buy.

Dc to.dc charger

100% love it

LiTime 12V 40A DC to DC Battery Charger with MPPT

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Why LiTime is Your Best Choice

TOP 1 LiFePO4 Brand

As the #1 LiFePO4 battery brand, LiTIme leads the market with the most complete power solutions—covering RVs, home storage, marine, golf carts, off-grid systems, and beyond.

15-Year Expertise

With 15 years of industry experience, LiTime serves over 350,000+ users globally, ensuring quality and trust. LiTime keeps innovating and has your back, always.

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With 24/7 expert support and an average 24-hour response time, we ensure you get the help you need, anytime. Whether it's pre-sales or after-sales, we guarantee 100% support every step of the way.

Expert-Backed Quality

LiTime is certified by top organizations like RVDA, backed by over 70+ patents and recognized for quality. Let authorities and patents prove why LiTime leads the way.

Industry-Leading Tech

With EV-grade cells passing 80+ tests and a self-developed BMS with under 1% margin of error, LiTime batteries ensure 15,000 cycles, 20+ protections, and up to 10 years of reliable performance.

Cutting-Edge Features

LiTime batteries offer a range of advanced features, including Bluetooth, low-temperature protection, self-heating, high-rate discharge, pre-charging, ensuring reliable power and peace of mind in any environment.

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User Insights

Matt Elliott

The weight difference was incredible. One 6v Battery weighed 63 lbs. this battery 38 lbs!

Reel in Florida

I think the mini is the real star of the show. 100ah in this small a package is perfect for kayaks and other small craft.

Patrick Dwivedi

I love the lighter weight of the battery. I no longer need to call on my trusty neighbors to help me install the battery inside my VW Bus.

Paul Muller

Shipping was extremely fast ( received within two days after placing order). Batteries work like a charm for our camper.

[KellG]

For the performance & reliability, I do recommend this battery

Dan M

The amount of power that this battery can instantly dump into the cart is awesome.

Eric Anderson

Used my new LiTime 12v 200a batteries for the first time this weekend. Couldn’t be happier!

mtkeane

I would say that not only are the products great, but so is the customer service.

Greg Sapp

Very impressed with the quality and the documentation provided by LiTime.

Reel in Florida

The best upgrade you can make!

Artie H

Li Time US , Great customer support services

Andrew Martin

This charger is a beast! Pleasantly surprised so far with LiTime products.

John D. Hollingsworth, Jr.

After many months of debate, I finally bit the bullet and rebuilt my Stealth 4x4 cart with the new batteries.

Customer

So far for my golf cart it's been a great battery I got the 10amp charger also no problems.

Eve Ford

Great customer service! The batteries ran our solar system on our camper with no problem.

Klaus Feldmeier

The replacement was straight forward - the new LiTimes batteries are nearly 50% lighter than the lead acid batteries.

Scott Winebarger

No complaints yet, still building my system, so far, I am impressed

[Timothy Vaughan] Vaughan

Already had my 100ah trolling motor battery out several times and it’s delivered in spades. Very happy with my purchase!

John Hogan

Though I had to reconfigure the base of the robot, I have more than enough battery capacity to run for hours.

Perry Mahnke

It's amazing how much lighter the LiTime Mini batteries are, the conversion was easy, and the fit & finish on the LiTime Minis is great.

Anthony Carita

Love how light this battery is. My mower lost about 100 Lbs of weight. The battery has a nice case and looks top quality.

Rob D.

Great Products. Really Great Support.

Matt Elliott

The weight difference was incredible. One 6v Battery weighed 63 lbs. this battery 38 lbs!

Reel in Florida

I think the mini is the real star of the show. 100ah in this small a package is perfect for kayaks and other small craft.

Patrick Dwivedi

I love the lighter weight of the battery. I no longer need to call on my trusty neighbors to help me install the battery inside my VW Bus.

Paul Muller

Shipping was extremely fast ( received within two days after placing order). Batteries work like a charm for our camper.

[KellG]

For the performance & reliability, I do recommend this battery

Dan M

The amount of power that this battery can instantly dump into the cart is awesome.

Eric Anderson

Used my new LiTime 12v 200a batteries for the first time this weekend. Couldn’t be happier!

mtkeane

I would say that not only are the products great, but so is the customer service.

Greg Sapp

Very impressed with the quality and the documentation provided by LiTime.

Reel in Florida

The best upgrade you can make!

Artie H

Li Time US , Great customer support services

Andrew Martin

This charger is a beast! Pleasantly surprised so far with LiTime products.

John D. Hollingsworth, Jr.

After many months of debate, I finally bit the bullet and rebuilt my Stealth 4x4 cart with the new batteries.

Customer

So far for my golf cart it's been a great battery I got the 10amp charger also no problems.

Eve Ford

Great customer service! The batteries ran our solar system on our camper with no problem.

Klaus Feldmeier

The replacement was straight forward - the new LiTimes batteries are nearly 50% lighter than the lead acid batteries.

Scott Winebarger

No complaints yet, still building my system, so far, I am impressed

[Timothy Vaughan] Vaughan

Already had my 100ah trolling motor battery out several times and it’s delivered in spades. Very happy with my purchase!

John Hogan

Though I had to reconfigure the base of the robot, I have more than enough battery capacity to run for hours.

Perry Mahnke

It's amazing how much lighter the LiTime Mini batteries are, the conversion was easy, and the fit & finish on the LiTime Minis is great.

Anthony Carita

Love how light this battery is. My mower lost about 100 Lbs of weight. The battery has a nice case and looks top quality.

Rob D.

Great Products. Really Great Support.

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"Globally trusted, LiTime’s innovation in energy solutions sets a new industry standard."

"LiTime combines cutting-edge technology with unmatched reliability, powering users' lives worldwide."

"LiTime’s LiFePO4 batteries provide outstanding performance, making it the top choice for customers."

"LiTime delivers powerful, reliable, and sustainable energy solutions tailored to meet every need."

"LiTime’s customer-centric approach drives the development of unparalleled energy solutions."

"LiTime's energy solutions combine advanced R&D with real-world user insights for unmatched reliability."

"With extensive research backing it, LiTime’s products are engineered for superior quality and durability."

"Renowned for its exceptional battery technology, LiTime is a trusted leader in energy innovation."

"The world trusts LiTime for innovative and dependable energy solutions, powering homes and businesses."

"LiTime's global reputation for excellence is built on performance, reliability, and cutting-edge technology."

"LiTime’s LiFePO4 batteries are the perfect fusion of innovation and reliability for every user."

"LiTime’s commitment to research ensures their products remain at the forefront of energy solutions."

"LiTime's power solutions are trusted by users globally, offering unmatched performance and longevity."

"LiTime’s success stems from combining groundbreaking technology with a deep understanding of customer needs."

"LiTime pioneers the future of energy with innovation, reliability, and sustainability."

LiTime batteries are installed to ABYC E-13 standards, fully compliant with lithium battery requirements.

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Proud Member of GCSAA – Trusted by golf course professionals nationwide.

Member of RVDA – Serving the RV Industry with advanced lithium power.

Powering the RV lifestyle with Escapees-backed lithium technology.

Official FMCA commercial member delivering trusted power for motorhome owners.

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12V 165Ah Smart

12V 100Ah Group27 Smart

16V 100Ah Smart

51.2V 100Ah GC Comm

16V 30Ah Smart

16V 70Ah Smart

14.6V+18.25V 10A

12V 100Ah Batteries

12V 100Ah

12V 100Ah Heat

12V 100Ah Max

12V 100Ah Group 24

12V 100Ah Group 24 Smart

12V 100Ah Group24 Omni

12V 100Ah Mini

12V 100Ah Mini Smart

12V 100Ah TM

12V 100Ah TM Smart

12V 100Ah OBM Smart

12V 100Ah Group27 Smart

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12V 6Ah

12V 12Ah

12V 20Ah Starting

12V 45Ah

12V 50Ah

12V 50Ah TM Smart

12V 65Ah

12V 100Ah

12V 100Ah Max

12V 100Ah Heat

12V 100Ah Xtra-Mini

12V 100Ah Mini

12V 100Ah Mini Smart

12V 100Ah TM

12V 100Ah TM Smart

12V 100Ah TM Plus Smart

12V 100Ah OBM Smart

12V 100Ah Group 24

12V 100Ah Group 24 Smart

12V 100Ah Group24 Omni

12V 100Ah Group27 Smart

12V 140Ah Dual

12V 140Ah Smart

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12V 200Ah

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12V 200Ah Heat

12V 200Ah Plus

12V 200Ah Plus Heat

12V 230Ah

12V 230Ah Smart

12V 280Ah

12V 280Ah Smart

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12V 460Ah

12V 560Ah

16V 30Ah Smart

16V 70Ah Smart

16V 100Ah Smart

24V 25Ah

24V 50Ah TM Smart

24V 100Ah Smart

24V 100Ah

24V 200Ah

24V 230Ah

24V 280Ah

36V 45Ah GC

36V 50Ah TM

36V 50Ah TM Smart

36V 60Ah GC

36V 100Ah GC

36V 100Ah OBM Smart

51.2V 30Ah GC

51.2V 30Ah GC Smart

51.2V 30Ah GC Comm

51.2V 60Ah GC

51.2V 100Ah GC Smart