---
product_id: 542525836
title: "LiTime 12V 40A DC-DC Battery Charger with MPPT Solar Controller, Dual Input Smart Charger for 14.6V LiFePO4 Lithium Batteries, Fast Charging for RVs, Campers, Trailers, Solar, Home Backup and Off-Grid"
brand: "litime"
price: "10920450₫"
currency: VND
in_stock: true
reviews_count: 8
category: "Litime"
url: https://www.desertcart.vn/products/542525836-litime-12v-40a-dc-dc-battery-charger-with-mppt-solar
store_origin: VN
region: Vietnam
---

# 40A fast charge output Emergency reverse charging MPPT solar controller 99% efficiency LiTime 12V 40A DC-DC Battery Charger with MPPT Solar Controller, Dual Input Smart Charger for 14.6V LiFePO4 Lithium Batteries, Fast Charging for RVs, Campers, Trailers, Solar, Home Backup and Off-Grid

**Brand:** litime
**Price:** 10920450₫
**Availability:** ✅ In Stock

## Summary

> ⚡ Charge smarter, live freer — power your off-grid lifestyle with LiTime!

## Quick Answers

- **What is this?** LiTime 12V 40A DC-DC Battery Charger with MPPT Solar Controller, Dual Input Smart Charger for 14.6V LiFePO4 Lithium Batteries, Fast Charging for RVs, Campers, Trailers, Solar, Home Backup and Off-Grid by litime
- **How much does it cost?** 10920450₫ with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/542525836-litime-12v-40a-dc-dc-battery-charger-with-mppt-solar)

## Best For

- litime enthusiasts

## Why This Product

- Trusted litime brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Rapid 40A Charging Power:** Get back on the road faster with high-current charging that powers your LiFePO4 and other 12V batteries in record time.
- • **Hybrid Dual Input Flexibility:** Seamlessly combine solar and DC inputs with built-in MPPT tech for up to 93% energy conversion—no extra controllers needed.
- • **Smart Alternator Compatibility:** Plug-and-play ACC wire auto-adjusts charging power for both smart and traditional alternators—zero hassle, maximum efficiency.
- • **Built-in Safety & Battery Revival:** Multi-layer protection guards against over-voltage, reverse polarity, and overheating while reactivating lithium batteries after BMS shutdown.
- • **Versatile Off-Grid Power Solution:** Ideal for RVs, campers, trailers, and home backup—charge on the move or from solar, ensuring you never miss a moment of adventure or comfort.

## Overview

The LiTime 12V 40A DC-DC Battery Charger with integrated MPPT solar controller delivers fast, efficient charging for 14.6V LiFePO4 and other 12V batteries. Featuring dual input for solar and DC sources, smart alternator compatibility, and emergency reverse charging, it’s engineered for RVs, campers, trailers, and off-grid setups. With multi-protection safety features and a compact design, it ensures reliable, eco-friendly power management wherever your journey takes you.

## Description

desertcart.com: LiTime 12V 40A DC-DC Battery Charger with MPPT Solar Controller, Dual Input Smart Charger for 14.6V LiFePO4 Lithium Batteries, Fast Charging for RVs, Campers, Trailers, Solar, Home Backup and Off-Grid : Automotive

Review: Works good - I have been using this 40amp DC-DC charger for 10 months now and it has been great. Works like it should and has been trouble free. I dont use solar so I cant judge that and I havent yet used the reverse charging so I dont know about that but I really hope that feature works. I have a 300amp alternator and a 300 amp hr battery. I like it very much
Review: Great in my mini-camper! - Connected this to my truck battery with fused 4 gauge cable. Used 2 gauge cables to the parallel 100ah batteries which power my 1500W sine wave inverter. Used breakers between connections for safety and peace of mind. I charge the battery bank while driving. **One caveat: this LiTime 40A dc-dc charger gets very HOT**. I now aim a fan at it while driving/charging my battery bank to help cool it. It charges my batteries very quickly and has gotten me out of a pickle while out camping with very little sun/solar availability! This system is now self-contained as long as I can run the truck engine. I have all the comforts of my home kitchen including fridge, microwave, toaster, instant pot, induction cooktop; cabin heater, air filters, electric blankets and heating pads. A true “glamping” experience!

## Features

- Compatibility: Works seamlessly with 12V LiFePO4, AGM, Gel, SLA, and Calcium batteries. Equipped with an ACC wire for both smart and traditional alternators, it automatically adjusts charging power, giving you a true plug-and-play setup without extra hassle.
- All-in-One High-Efficiency Charging: Charge your battery via DC input, solar panels, or both in hybrid mode. The built-in MPPT (99% tracking efficiency) replaces extra controllers, saving cost and space while delivering up to 93% conversion efficiency.
- Emergency Reverse Charging: In case your starter battery runs flat, this 12V DC-DC charger can reverse charge directly from the auxiliary battery, letting you get back on the road quickly without waiting for roadside assistance.
- 40A Output for Faster Charging: With up to 40 Amps of charging current, this dc to dc charger quickly restores battery levels. Can charge service batteries or directly power DC loads, ideal for RV, Camper, Trailers, Home Backup and Off-Grid Power Systems.
- Multi-Protection: This LiTime battery charger features over-voltage, reverse polarity, over-temperature and charging timeout protection, helps extend battery lifespan, ensure safe operation in battery charging. It can also reactivate lithium batteries after BMS shutdown. FCC, CE, and RoHS certifications, ensuring safe and eco-friendly operation.
- Warning: This 12 volt 40 amp dc to dc battery charger is not waterproof - not suitable for Marine environments such as boats, ships, yachts, trolling motors, etc.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0C4SMQ1PX |
| Battery Charge Time | 3 Hours |
| Best Sellers Rank | #103,950 in Automotive ( See Top 100 in Automotive ) #427 in Battery Chargers |
| Brand | Litime |
| Color | Black |
| Current Rating | 40 Amps |
| Customer Reviews | 3.9 out of 5 stars 171 Reviews |
| Input Voltage | 12 Volts (DC) |
| Item Dimensions D x W x H | 7.44"D x 5.83"W x 1.89"H |
| Item Weight | 2.4 Pounds |
| Manufacturer | LiTime |
| Output Voltage | 12 Volts |
| Product Dimensions | 7.44"D x 5.83"W x 1.89"H |
| Warranty Description | 2 Years Warranty |

## Product Details

- **Brand:** Litime
- **Color:** Black
- **Item Weight:** 2.43 Pounds
- **Output Voltage:** 12 Volts
- **Product Dimensions:** 7.44"D x 5.83"W x 1.89"H

## Images

![LiTime 12V 40A DC-DC Battery Charger with MPPT Solar Controller, Dual Input Smart Charger for 14.6V LiFePO4 Lithium Batteries, Fast Charging for RVs, Campers, Trailers, Solar, Home Backup and Off-Grid - Image 1](https://m.media-amazon.com/images/I/71UNjnxThrL.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: When installing the DC-DC charger, are there any precautions I need to be aware of?**
A: First, installing the charger vertically will improve venting and heat dissipation of the charger. Additionally, positioning the DC-DC charger nearer the service battery is advised.

**Q: Can the battery be charged with both the solar and the alternator at the same time?**
A: The DC-DC charger will choose the DC input automatically rather than charging the service battery with both the solar and DC inputs.

**Q: Can LiTime 12V 40A DC-DC charger activate the low voltage LiFePO4 battery?**
A: YES, LiTime 12V 40A DC-DC has a lithium battery activation function, but the battery needs to be disconnected from the load for activation.

**Q: Should I add breakers (fuses) when using a DC-DC charger?**
A: YES, it is strongly advised. It is suggested that a breaker be installed between the DC-DC charger and the starter battery.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works good
*by W***M on January 19, 2026*

I have been using this 40amp DC-DC charger for 10 months now and it has been great. Works like it should and has been trouble free. I dont use solar so I cant judge that and I havent yet used the reverse charging so I dont know about that but I really hope that feature works. I have a 300amp alternator and a 300 amp hr battery. I like it very much

### ⭐⭐⭐⭐⭐ Great in my mini-camper!
*by A***R on October 16, 2025*

Connected this to my truck battery with fused 4 gauge cable. Used 2 gauge cables to the parallel 100ah batteries which power my 1500W sine wave inverter. Used breakers between connections for safety and peace of mind. I charge the battery bank while driving. **One caveat: this LiTime 40A dc-dc charger gets very HOT**. I now aim a fan at it while driving/charging my battery bank to help cool it. It charges my batteries very quickly and has gotten me out of a pickle while out camping with very little sun/solar availability! This system is now self-contained as long as I can run the truck engine. I have all the comforts of my home kitchen including fridge, microwave, toaster, instant pot, induction cooktop; cabin heater, air filters, electric blankets and heating pads. A true “glamping” experience!

### ⭐ This won't run in 40Amp mode.
*by R***D on February 24, 2026*

You can't run this in 40 Amp mode. Mine barely worked in 20 Amp mode. It cycled off and on a lot (red light error) even with 6 foot wires from my Aux RV Battery. It may have charged my LifePO4 batteries 50% of the time. LiTime customer service did let me ship it back to them and gave me a full refund though which is good. I just think this is one of their poor products. I use their LifePO4 batteries which are great!

## Frequently Bought Together

- LiTime 12V 40A DC-DC Dual Input Battery Charger with MPPT fit for 12V LiFePO4, Lead-Acid, SLA, Gel, AGM, Calcium Battery, Charger with Anderson Connector Reverse Charge for RVs Campers Trailers Boats
- LiTime 500A Battery Monitor with Shunt, 8V-120V Battery Monitor for RV Motorcycle Golf Cart Solar Panel with LCD Backlight Screen Buzzer Alarm, Capacity Percentage Time Power Voltmeter Display
- TKDMR 10pcs 1/0 AWG-3/8 Battery Lugs,Heavy Duty Wire Lugs,Ring Terminals,Battery Cable Ends,0 Guage terminals,Battery Terminal Connectors with 10pcs 3:1 Heat Shrink Tubing

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*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-03-15*