--- product_id: 743490620 title: "12V 40A DC to DC Charger with MPPT for Solar & Alternator Input - Smart On-Board Battery Charger for RV, Marine, Car - Charge AGM, Lithium, Gel, Flooded Batteries" brand: "renogy rego" price: "1572.93 DT" currency: TND in_stock: true reviews_count: 1 category: "Renogy Rego" url: https://www.desertcart.tn/products/743490620-12v-40a-dc-to-dc-charger-with-mppt-for-solar store_origin: TN region: Tunisia --- # 40A max charging current Dual input: solar + alternator MPPT solar input for max efficiency 12V 40A DC to DC Charger with MPPT for Solar & Alternator Input - Smart On-Board Battery Charger for RV, Marine, Car - Charge AGM, Lithium, Gel, Flooded Batteries **Brand:** renogy rego **Price:** 1572.93 DT **Availability:** โœ… In Stock ## Summary > ๐Ÿ”‹ Charge smarter, roam farther โ€” power your journey with Renogy REGO! ## Quick Answers - **What is this?** 12V 40A DC to DC Charger with MPPT for Solar & Alternator Input - Smart On-Board Battery Charger for RV, Marine, Car - Charge AGM, Lithium, Gel, Flooded Batteries by renogy rego - **How much does it cost?** 1572.93 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/743490620-12v-40a-dc-to-dc-charger-with-mppt-for-solar) ## Best For - renogy rego enthusiasts ## Why This Product - Trusted renogy rego brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - โ€ข **Power-Packed 40A Output:** Charge your batteries faster and smarter with a robust 40-amp current that keeps your RV or marine setup ready for adventure. - โ€ข **Plug-and-Play Simplicity:** Color-coded cables and intuitive LED indicators make installation and monitoring effortlessโ€”get powered up in 15 minutes. - โ€ข **Smart Dual-Source Charging:** Seamlessly switch between solar and alternator inputs to maximize charging efficiency wherever you roam. - โ€ข **Built for Extreme Conditions:** Engineered to withstand desert heat and marine salt spray, this charger thrives in the harshest environments. - โ€ข **Adaptive 4-Stage Charging Logic:** Tailored charging profiles for AGM, Lithium, Gel, and Flooded batteries ensure longevity and peak performance. ## Overview The RENOGY REGO 12V 40A DC to DC Charger with MPPT is a versatile, rugged battery charger designed for RV, marine, and off-grid use. It intelligently switches between solar and alternator inputs to optimize charging efficiency, supports multiple battery chemistries with adaptive 4-stage charging, and offers comprehensive protection against electrical faults. Built to endure extreme temperatures and salt spray, it combines high performance with easy installation and real-time LED diagnostics. ## Description Product description Accs Recommended Specs Recommended What type of alternator is this DC to DC on board battery charger compatible with? Works with both alternators. But smart alternators vary voltage, so you MUST connect the charger's IGN (ACC) cable to the Vehicle Ignition Port for them to work properly. What type of alternator is this DC to DC on board battery charger compatible with? Works with both alternators. But smart alternators vary voltage, so you MUST connect the charger's IGN (ACC) cable to the Vehicle Ignition Port for them to work properly. What types of battery does the charger support? It's suitable for 12V Lithium, Gel, AGM, and Calcium batteries. This charger enables the batteries to reach a full 100% charge. Additionally, it has the capability to revive lithium batteries that have become discharged to a low voltage. What types of battery does the charger support? It's suitable for 12V Lithium, Gel, AGM, and Calcium batteries. This charger enables the batteries to reach a full 100% charge. Additionally, it has the capability to revive lithium batteries that have become discharged to a low voltage. How do l set the battery since there is no display screen? To change the battery type, press and hold the SELECT button on the side of the battery charger. The LED lights corresponding to each battery type will illuminate in sequence, indicating the available options. How do l set the battery since there is no display screen? To change the battery type, press and hold the SELECT button on the side of the battery charger. The LED lights corresponding to each battery type will illuminate in sequence, indicating the available options. If both solar power and the engine are available, can we prioritize using solar power to charge the battery? Our product defaults to DC charging. To prioritize solar charging, simply press the SELECT button on the side. If both solar power and the engine are available, can we prioritize using solar power to charge the battery? Our product defaults to DC charging. To prioritize solar charging, simply press the SELECT button on the side. Can solar charging and DC charging be switched automatically? Charging automatically switches to solar when: 1. Generator ON: DC 13V 2. Generator OFF: DC 13V Can solar charging and DC charging be switched automatically? Charging automatically switches to solar when 1. Generator ON: DC 13V 2. Generator OFF: DC 13V Review: Check the VOC rating of your panels - Max VOC of 30 so does not work with Renogy Shadowflux 120W panels (33.7 volts VOC) but I like those panels. This probably should only be used with panels that are 25 or less VOC. The DC to DC function may be worth keeping at the sale price but some of the reviews say it doesn't start charging until your battery is below 12.6 volts. If that is true, that would be a deal breaker. I'm looking at a Victron 100/30. I may keep this for the dc to dc charging function or just get something else for the DC DC charging. I like Renogy stuff and have it in my other camp setup, but do your research, everything must be compatible. Update: I did add the victon for my solar charging and plan to use this for DC to DC charging. In testing this out I found a couple other small issues. It is designed to work with newer smart alternators which my van has but it is causing an issue. Smart alternators vary the voltage to save energy so to accomodate that the DC charger won't disconnect until voltage drops pretty low. It watched it continuing to charge my house battery after the engine was shut off for a minute or so until the voltage hit 11.8. It quickly recovered back to 12.5 but I don't like that. I don't think the optional IGN wire would help because it only ensures charging continues if voltage drops a bit. Whether you connect it or not, it does not stop charging, it only ensure charging continues under lower voltages. And there is no dedicated power button. If I don't add a power cutoff it will pull power out of my starter battery every time I shut off the van until it hits its lower cutoff voltage. The other problem the lower voltage disconnect causes is I can't use a separate small trickle charger on my starter battery for when the RV sits most of the time. Otherwise the trickle charger will likely trigger DC to DC charging.. A dedicated shutoff should solve most of my issues which will be good anyway to prevent it from trying to charge my lithium battery below freezing. I was also going to lower the max charging to 20 amps but you need to buy the bluetooth module in order to change that setting. Ideally it should be built in. This seems well made but I am having to figure workarounds for my situation, and my situation isn't that unique. I think separate components rather than trying to do everything with a combined unit would have made more sense for me. ## Features - RENOGY REGO DC-DC Charger ๐ฐ๐ข๐ญ๐ก ๐Ÿ ๐‚๐ก๐š๐ซ๐ ๐ข๐ง๐  ๐Ž๐ฉ๐ญ๐ข๐จ๐ง๐ฌ- 40A DC-DC MPPT battery charger offers ๐ญ๐ฐ๐จ ๐ฏ๐ž๐ซ๐ฌ๐š๐ญ๐ข๐ฅ๐ž ๐œ๐ก๐š๐ซ๐ ๐ข๐ง๐  ๐ฆ๐จ๐๐ž๐ฌ ๐ญ๐จ ๐ฆ๐š๐ฑ๐ข๐ฆ๐ข๐ณ๐ž ๐ž๐Ÿ๐Ÿ๐ข๐œ๐ข๐ž๐ง๐œ๐ฒ. The 12v battery charger defaults to DC input priority mode. It will ๐š๐ฎ๐ญ๐จ๐ฆ๐š๐ญ๐ข๐œ๐š๐ฅ๐ฅ๐ฒ ๐ฌ๐ฐ๐ข๐ญ๐œ๐ก to the alternate charging mode when the input voltage in the primary mode falls below the default voltage. This ensures ๐ฆ๐š๐ฑ๐ข๐ฆ๐ฎ๐ฆ ๐ž๐Ÿ๐Ÿ๐ข๐œ๐ข๐ž๐ง๐œ๐ฒ in charging your battery whether you're on the road or parked - ๐€๐ฅ๐ฅ-๐ข๐ง-๐Ž๐ง๐ž ๐‘๐• ๐๐จ๐ฐ๐ž๐ซ ๐‡๐ฎ๐›: Solar Charger + Alternator/DC-DC Charger with MPPT Versatile compatibility with LiFePO4, Gel, Flooded, and Sealed Lead Acid batteries. Its adaptive ๐Ÿ’-๐ฌ๐ญ๐š๐ ๐ž charging logic (๐๐ฎ๐ฅ๐ค/๐€๐›๐ฌ๐จ๐ซ๐ฉ๐ญ๐ข๐จ๐ง/ ๐…๐ฅ๐จ๐š๐ญ/ ๐„๐ช๐ฎ๐š๐ฅ๐ข๐ณ๐š๐ญ๐ข๐จ๐ง) tailors voltage/current for each chemistry, ensuring safe, efficient charging from solar panels, vehicle alternators (๐ฌ๐ฆ๐š๐ซ๐ญ/๐œ๐จ๐ง๐ฏ๐ž๐ง๐ญ๐ข๐จ๐ง๐š๐ฅ), or DC sources. Ideal for RVs, boats, and off-grid systems requiring seamless multi-source power management - 40A DC-DC Charger with MPPT & Solar Charger: This ๐‘๐„๐๐Ž๐†๐˜ multi-battery charger delivers ๐œ๐จ๐ฆ๐ฉ๐ซ๐ž๐ก๐ž๐ง๐ฌ๐ข๐ฏ๐ž ๐ฉ๐ซ๐จ๐ญ๐ž๐œ๐ญ๐ข๐จ๐ง for solar, alternator, and battery systems. Safeguarding against reverse polarity, over/under-voltage, and over-temperature, the 12V DC to DC charger ensures reliable operation across all scenarios. Ideal for RVs, marine, and off-grid setups requiring robust solar charging and alternator integration - ๐„๐ฑ๐ญ๐ซ๐ž๐ฆ๐ž-๐๐ซ๐จ๐จ๐Ÿ 12V DC to DC Charger 40A: Survives desert heat (113ยฐF) and marine salt spray (-4ยฐF~113ยฐF). ๐‘๐„๐๐Ž๐†๐˜ DC to DC charger 12V 40 amp delivers idiot-proof safety, auto-shuts off during shorts/reverse connections, while temperature compensation protects lead-acid batteries. Color-coded cables enable 15-minute installs, and LED indicators glow red for faultsโ€”perfect for tight truck beds or beachside relaxation - ๐„๐š๐ฌ๐ฒ-๐”๐ฌ๐ž 40A MPPT DC-DC/Solar Charger: RENOGY REGO 12V DC to DC charger with solar integration features ๐ข๐ง๐ญ๐ฎ๐ข๐ญ๐ข๐ฏ๐ž ๐ข๐ง๐๐ข๐œ๐š๐ญ๐จ๐ซ ๐ฅ๐ข๐ ๐ก๐ญ๐ฌ and one-touch battery type selection (๐‹๐ข๐…๐ž๐๐Ž๐Ÿ’/๐†๐ž๐ฅ /๐…๐ฅ๐จ๐จ๐๐ž๐/ ๐’๐‹๐€). LED alerts instantly flag errors like reverse polarity or over-voltage. Streamline your power management with this versatile battery charger โ€“ designed for effortless RV, marine, and off-grid operation ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0FCFM5RVB | | Amperage | 40 Amps | | Best Sellers Rank | #1,076,639 in Automotive ( See Top 100 in Automotive ) #1,891 in Battery Chargers | | Brand | RENOGY REGO | | Color | Black | | Compatible Devices | Batteries (LiFePO4, Gel, Flooded, Sealed Lead Acid) | | Connector Type Used on Cable | Battery Clamps/Ring Terminals | | Current Rating | 40 Amps | | Customer Reviews | 2.7 out of 5 stars 3 Reviews | | Input Voltage | 16 Volts | | Item Dimensions D x W x H | 2.3"D x 9.31"W x 5.17"H | | Manufacturer | RENOGY | | Output Voltage | 12 Volts (DC) | | Product Dimensions | 2.3"D x 9.31"W x 5.17"H | | Specification Met | UL, CE, FCC | | Warranty Description | 2-year material and workmanship warranty | ## Product Details - **Brand:** RENOGY REGO - **Current Rating:** 40 Amps - **Input Voltage:** 16 Volts - **Output Voltage:** 12 Volts (DC) - **Product Dimensions:** 2.3"D x 9.31"W x 5.17"H ## Images ![12V 40A DC to DC Charger with MPPT for Solar & Alternator Input - Smart On-Board Battery Charger for RV, Marine, Car - Charge AGM, Lithium, Gel, Flooded Batteries - Image 1](https://m.media-amazon.com/images/I/61YHHKvMD2L.jpg) ![12V 40A DC to DC Charger with MPPT for Solar & Alternator Input - Smart On-Board Battery Charger for RV, Marine, Car - Charge AGM, Lithium, Gel, Flooded Batteries - Image 2](https://m.media-amazon.com/images/I/71f29S3wgDL.jpg) ![12V 40A DC to DC Charger with MPPT for Solar & Alternator Input - Smart On-Board Battery Charger for RV, Marine, Car - Charge AGM, Lithium, Gel, Flooded Batteries - Image 3](https://m.media-amazon.com/images/I/71+rmcQDC1L.jpg) ![12V 40A DC to DC Charger with MPPT for Solar & Alternator Input - Smart On-Board Battery Charger for RV, Marine, Car - Charge AGM, Lithium, Gel, Flooded Batteries - Image 4](https://m.media-amazon.com/images/I/71leRFZxoKL.jpg) ![12V 40A DC to DC Charger with MPPT for Solar & Alternator Input - Smart On-Board Battery Charger for RV, Marine, Car - Charge AGM, Lithium, Gel, Flooded Batteries - Image 5](https://m.media-amazon.com/images/I/71SPMpqu1mL.jpg) ## Questions & Answers **Q: What type of alternator is this DC to DC on board battery charger compatible with?** A: Works with both alternators. But smart alternators vary voltage, so you MUST connect the charger's IGN (ACC) cable to the Vehicle Ignition Port for them to work properly. **Q: What types of battery does the charger support?** A: It's suitable for 12V Lithium, Gel, AGM, and Calcium batteries. This charger enables the batteries to reach a full 100% charge. Additionally, it has the capability to revive lithium batteries that have become discharged to a low voltage. **Q: How do l set the battery since there is no display screen?** A: To change the battery type, press and hold the SELECT button on the side of the battery charger. The LED lights corresponding to each battery type will illuminate in sequence, indicating the available options. **Q: If both solar power and the engine are available, can we prioritize using solar power to charge the battery?** A: Our product defaults to DC charging. To prioritize solar charging, simply press the SELECT button on the side. **Q: Can solar charging and DC charging be switched automatically?** A: Charging automatically switches to solar when 1. Generator ON: DC <11.3V & Solar >13V 2. Generator OFF: DC <12.7V & Solar >13V ## Customer Reviews ### โญโญโญ Check the VOC rating of your panels *by F***K on November 2, 2025* Max VOC of 30 so does not work with Renogy Shadowflux 120W panels (33.7 volts VOC) but I like those panels. This probably should only be used with panels that are 25 or less VOC. The DC to DC function may be worth keeping at the sale price but some of the reviews say it doesn't start charging until your battery is below 12.6 volts. If that is true, that would be a deal breaker. I'm looking at a Victron 100/30. I may keep this for the dc to dc charging function or just get something else for the DC DC charging. I like Renogy stuff and have it in my other camp setup, but do your research, everything must be compatible. Update: I did add the victon for my solar charging and plan to use this for DC to DC charging. In testing this out I found a couple other small issues. It is designed to work with newer smart alternators which my van has but it is causing an issue. Smart alternators vary the voltage to save energy so to accomodate that the DC charger won't disconnect until voltage drops pretty low. It watched it continuing to charge my house battery after the engine was shut off for a minute or so until the voltage hit 11.8. It quickly recovered back to 12.5 but I don't like that. I don't think the optional IGN wire would help because it only ensures charging continues if voltage drops a bit. Whether you connect it or not, it does not stop charging, it only ensure charging continues under lower voltages. And there is no dedicated power button. If I don't add a power cutoff it will pull power out of my starter battery every time I shut off the van until it hits its lower cutoff voltage. The other problem the lower voltage disconnect causes is I can't use a separate small trickle charger on my starter battery for when the RV sits most of the time. Otherwise the trickle charger will likely trigger DC to DC charging.. A dedicated shutoff should solve most of my issues which will be good anyway to prevent it from trying to charge my lithium battery below freezing. I was also going to lower the max charging to 20 amps but you need to buy the bluetooth module in order to change that setting. Ideally it should be built in. This seems well made but I am having to figure workarounds for my situation, and my situation isn't that unique. I think separate components rather than trying to do everything with a combined unit would have made more sense for me. --- ## Why Shop on Desertcart? - ๐Ÿ›’ **Trusted by 1.3+ Million Shoppers** โ€” Serving international shoppers since 2016 - ๐ŸŒ **Shop Globally** โ€” Access 737+ million products across 21 categories - ๐Ÿ’ฐ **No Hidden Fees** โ€” All customs, duties, and taxes included in the price - ๐Ÿ”„ **15-Day Free Returns** โ€” Hassle-free returns (30 days for PRO members) - ๐Ÿ”’ **Secure Payments** โ€” Trusted payment options with buyer protection - โญ **TrustPilot Rated 4.5/5** โ€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tn/products/743490620-12v-40a-dc-to-dc-charger-with-mppt-for-solar](https://www.desertcart.tn/products/743490620-12v-40a-dc-to-dc-charger-with-mppt-for-solar) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-06-08*