- REDARC Dual Input 25A in-Vehicle DC to DC Battery Charger with MPPT Solar Regulator, Green Power Priority, 12V/24V Compatible, for Lithium, AGM, Gel, Lead Acid, Calcium, LiFePO4 Batteries

I have had this installed on my 4Runner since 2019. I use it for alternator and solar charging via a panel permanently installed on my roof rack. I have never had an issue with it overheating or any other problem. My two auxiliary batteries, used for Snomaster fridge/freezer and CPAP machine, remain in great shape due to this unit. I highly recommend this appliance.

It's rare when a product exceeds expectations, but this blew me away. It's built like a tank. Overdesigned, with huge cables. The engineers that designed this put a lot of passion into the design, and it shows. Over-voltage shut off, under-voltage shut off. Massive cables, and delivers the amps.I'm an electrical engineer, and a 'wire guy', and this charger is amazing.I wired this (orange-green wires connected) for LiFePO4 battery.On the input side my truck supplied approximately 12.5V and up to 30A drawn from the system battery. On the output, a clean 14.4V and full rated 25A.Once I shut off my truck, the truck battery draw stops, and I'm running on the secondary batteries I charged. Exactly as I wanted.This is made in Australia, and I can say I'm super impressed. I'm old enough to remember when "made in America" meant something - products that were built rugged and lasted forever. This charger has the same feel. Cables larger than they need to be. Big heat sink. No doubt this will last and last. I anticipate many happy years with this charger.After years of buying marginal products from overseas that barely deliver, it's refreshing to find one that inspires as much confidence as this. A work of engineering art. Very much looking forward to using it.

Awesome product, charges my second battery (Optima) nicely. Took a 4 day trip off grid with no problems. Never ran short of power. Only drove my vehicle 1-2 hours a day. Quickly charged up my system that powers the refrigerator. Couldn’t be happier.

It is an exceptional product, well built and feature rich, but the thing that was incredible was the customer service. I talked to Mark Bruce in Internationl Support and he was incredible. He walked me through everything I would need to set it up and sent me a wiring diagram for my specific application. We are on opposite sides of the world, so for several nights I would email him questions and each morning I had detailed answers. I have since installed it and it is running great. RedArc is the big dog in this market for a reason.

honestly works perfectly. i only rated it 4/5 because the price i feel is a bit steep for its function. although i dont know the cost of putting one of these together. i think if it was maybe $100-$200 cheaper, it would be a perfect spot. make sure you read the instructions if youre installing it yourself. otherwise just have a pro install it.

Does the job. Just installed a second AGM battery and a smart isolater kit. It wouldn't top off my AGM battery because I have a smart alternator which cycles from 12.8v to high 13's depending on what the state of charge is on my start battery. This REDARC BCDC charger solves that problem and charges my auxiliary AGM battery to 14.6v (full charge) regardless of what my stock charging system is doing. I mounted it under the hood on top of my fuse box. It gets hot there from engine heat so we'll see how it does on a 2000 mile trip this week. I bought this mainly to power an 80 qt compressor fridge/freezer unit. Later I plan to add an inverter to my system.

I was looking for a reliable charging method for adding a second battery to my camper, with the ability to add solar down the road. My truck is newer and the alternator produces a charge profile specific to lead acid batteries, thus not providing ample voltage to charge my AGM "house battery". this unit bumps the voltage up to what's necessary for a healthy charge.So far it's been flawless! this combined with a 100ah Renogy AGM battery and I've got enough juice for several days off the grid in my little camper.I also purchased a cheap bluetooth battery monitor here on Amazon, and make sure I don't drain the battery below 50%

While designing the circuitry in which this charger would be a key player I have had to discuss many questions with Redarc. I have always been pleased with their patience and depth of knowledge even though they are all the way on the other side of the world. I have not actually experienced the device in action, but I have tested it and am pleased with it so far.