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.

Q: Why is my DC-DC charger not charging?

If your DC-DC charger isn't charging your LiFePO4 battery, even with normal or flashing lights, the issue is often related to wiring, settings, or vehicle voltage.We've created a detailed troubleshooting guide to help you diagnose and fix the problem. You can find it here: DC-DC Charger Troubleshooting Guide

$209.99

$279.98

24% OFF

30-Day Price Guarantee & 7-Day Free Return Policy Included

【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

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$209.99

$279.98

24% OFF

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30-Day Price Match

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7-Day Free Returns

7 days no-questions-asked return.

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Delivered in 2–5 business days.

12V 40A DC-DC with MPPT

$209.99

$279.98

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Features Specs FAQ Reviews

Features

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.

Why is my DC-DC charger not charging?

If your DC-DC charger isn't charging your LiFePO4 battery, even with normal or flashing lights, the issue is often related to wiring, settings, or vehicle voltage.

We've created a detailed troubleshooting guide to help you diagnose and fix the problem. You can find it here: DC-DC Charger Troubleshooting Guide

REVIEWS

Works great

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

Great Product! Full Installation Video AvailablE

So far, everything is working great! I installed this DC-DC charger in my van and documented the entire process in a detailed video. If youre looking for a step-by-step guide, check out my install video here: How to Install a DC-DC Charger in Your Van | Ultimate DIY Guide!.

Ill update this review after some time to share how its holding up!

Me falla mi cargador

Hola, tengo problemas con mi cargador, con el alternador funciona 1 minuto y se apaga así por varias veces, ya cambie los disyuntores y sigue igual, alguna ayuda? ya tengo varios meses con esta falla le pedí a la tienda que me lo cambie pero estoy en Perú y no lo puedo enviar por que me piden un certificado que no es una batería, en sistema solar funciona bien, espero que la casa me pueda enviar uno de reemplazo pronto.

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.

Nice DC to DC charge

On time delivery, easy to use, easy to install and works great!

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Matt Elliott

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

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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.

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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.

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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

A LiTime 51.2V 100Ah battery is placed on carpet, showcasing its features alongside a tennis ball for scale, in a customer review

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!

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mtkeane

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

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

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Reel in Florida

The best upgrade you can make!

Artie H

Li Time US , Great customer support services

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

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

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

Features

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REVIEWS

Customer Reviews

Official Website Only

Official Website Discount

LiFePO4 Experts Support

Risk-Free Warranty

Free Shipping

LiPoints & Rewards

One-Stop-Solution

Why LiTime is Your Best Choice

TOP 1 LiFePO4 Brand

15-Year Expertise

24/7 Expert Support

Expert-Backed Quality

Industry-Leading Tech

Cutting-Edge Features

User-Driven Power Stories

Power You Can Trust, Backed By Experts

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