---
product_id: 593552023
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: "$1039.87"
currency: USD
in_stock: true
reviews_count: 5
category: "Litime"
url: https://www.desertcart.ec/products/593552023-litime-12v-40a-dc-dc-battery-charger-with-mppt-solar
store_origin: EC
region: Ecuador
---

# 40A fast charging output Emergency reverse charging 99% MPPT solar tracking 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:** $1039.87
**Availability:** ✅ In Stock

## Summary

> ⚡ Power your adventure with smart, fast, and fail-safe charging!

## 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?** $1039.87 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/593552023-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 Power Boost:** Charge your LiFePO4 and other 12V batteries faster than ever, minimizing downtime on the road or off-grid.
- • **Hybrid Solar + DC Input:** Seamlessly combine solar panels and DC power for maximum energy harvesting with industry-leading 99% MPPT efficiency.
- • **Emergency Reverse Charge:** Never get stranded—reverse charge your starter battery from the auxiliary battery and hit the road again in minutes.
- • **Built-in Multi-Protection:** Over-voltage, reverse polarity, over-temperature, and timeout safeguards extend battery life and ensure safe, reliable operation.
- • **Smart Alternator Compatibility:** Plug-and-play ACC wire auto-adjusts charging power for both smart and traditional alternators—no extra setup needed.

## Overview

The LiTime 12V 40A DC-DC Battery Charger with integrated MPPT solar controller is a versatile, high-efficiency charger designed for LiFePO4 and other 12V batteries. It supports dual input from DC sources and solar panels, delivering up to 40 amps of fast charging with 99% solar tracking efficiency. Featuring smart alternator compatibility and emergency reverse charging, it’s ideal for RVs, campers, trailers, home backup, and off-grid setups. Multi-layer protection ensures safe, durable performance, making it a professional-grade solution for millennial adventurers demanding reliable power on the go.

## Description

12V40A DC Dual-Input MPPT Smart Battery Charger delivers professional battery charger performance as both a dc to dc charger and dc charger with built-in MPPT technology, making it the ultimate smart battery charger for your lithium battery charger and lifepo4 battery charger needs. This powerful 40a lifepo4 battery charger provides 40 amp charger output through its advanced 12v dc to dc charger and dc to dc charger 12v lifepo4 circuits, while the integrated MPPT controller ensures maximum solar harvesting efficiency. The smart chargers technology automatically optimizes charging for lithium battery with charger systems, featuring precision lithium battery charger 12v lifepo4, 12v lifepo4 battery charger, and 12 volt lithium battery charger modes that extend battery life while delivering 12v fast battery charger speeds. Fully compatible with litime battery charger systems including litime dc to dc charger, litime 40a charger, litime charger 12v, litime lifepo4 battery charger, and litime lithium battery charger, this versatile 40a battery charger is perfect for RV owners needing reliable rv lithium battery charger performance, marine applications requiring robust charging solutions, and off-grid enthusiasts optimizing solar input. The 12v lithium battery charger and 12v charger functionalities provide flexible charging options, while the 12 volt lifepo4 battery charger mode ensures optimal performance for deep cycle systems. With additional support for li time battery charger and li time dc to dc charger configurations, this litime 40 amp charger represents the pinnacle of charging technology, combining 40a lifepo4 charger power with intelligent lithium charger 12v precision in one compact, user-friendly package designed for American adventurers who demand professional-grade battery charger 40a performance without compromise.

Review: 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: 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 |
| Best Sellers Rank | 970,081 in Automotive ( See Top 100 in Automotive ) 2,596 in Car Battery Charging Units |
| Guaranteed software updates until | unknown |
| Item model number | L12V40A-DC-Z |
| Manufacturer | LiTime |
| Product Dimensions | 18.9 x 14.81 x 4.8 cm; 1.1 kg |

## Product Details

- **Brand:** Litime
- **Colour:** black
- **Item weight:** 2.43 Pounds
- **Output voltage:** 12 Volts
- **Product dimensions:** 18.9D x 14.8W x 4.8H centimetres

## 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)
![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 2](https://m.media-amazon.com/images/I/81lStmt8vAL.jpg)
![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 3](https://m.media-amazon.com/images/I/71zvWdg-fAL.jpg)
![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 4](https://m.media-amazon.com/images/I/71DSSnqqIBL.jpg)
![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 5](https://m.media-amazon.com/images/I/81sIW-nwsoL.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

### ⭐⭐⭐⭐⭐ Review
*by W***M on 19 January 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

### ⭐⭐⭐⭐⭐ Review
*by A***R on 16 October 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!

### ⭐⭐⭐⭐ Review
*by M***T on 23 October 2025*

I’ve bought many LiTime products in the past and have been very pleased with their quality, reliability, and performance. I should’ve read the specifications more closely before purchasing it. After receiving it, I realized that it is limited to a solar panel Voc of 26V. Most panels are substantially higher than this making this unit not very useful to me as a MPPT controller. Yes, the Voc limit is indicated in the specifications way down the page, but considering that the Voc is as low as it is, the manufacturer should do a better job of stating this more prominently. Anybody that’s moving 40A around to charge and recharge batteries is probably going to be using panels with a Voc of at least 30 to 40 V. Because of the need to protect against high Voc on a cold day with full batteries, I would expect a 40A MPPT controller would have a max Voc of at least 50 V. Nonetheless, because I did not read the specifications more closely and I was in a hurry to get my DC to DC battery charger installed, I’ve decided to keep the unit and hope to find one or more panels in the future that have a low enough Voc that I can use them as well. UPDATE LiTime contacted me after I posted this review and offered me a full refund if I was not completely satisfied. This is an example of the kind of excellent customer service I have experienced from LiTime in the past. Because it was basically my error not to be more diligent when purchasing this, I have updated my review to soften my criticism and I have decided to raise my review from 3 to 4 stars. This was my decision alone and LiTime did not pressure me to do this in any way. The unit I purchased is exactly what was advertised and performs well doing the most important function than I needed: DC to DC charging. Just make sure that if you plan to use this as an MPPT controller that you have panels with a Voc of not much over 20V, otherwise you risk damaging the MPPT controller on a cold sunny day.

## 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 Ecuador*
*Store origin: EC*
*Last updated: 2026-03-04*