Renogy 12V 50A DC to DC Battery Charger with MPPT, On-Board Battery for Gel, ...

I have a cargo trailer that I use for work with a 2000 watt inverter to run power tool chargers & lights in the trailer. I have a 200 watt solar array connected to the solar input as well as the vehicle smart alternator input. The (2) 100 Ah AGM batteries stay charged through this device to where I never have to plug in my trailer to the house to charge my batteries. What I like about this product is if it’s cloudy and I’m using power then the vehicle will charge the batteries as I’m driving from job to job or I can start the truck for a few minutes and get a charge. This device also prevents voltage feeding back to the vehicle from my trailer batteries as it would if it were connected straight to the battery output from the truck. It also prevents overcharging of the batteries, extending the life. Lastly, the ability to change battery types on this device makes it great to use for different battery chemical types. The price is a little high but it does exactly what I need in just one device.

I upgraded my solar panel with the shade tech panel. Then found out I needed to upgrade to this 50amp dc/dc charger from my 30 amp This works well and keeps the batteries top off. If I read the instructions correctly it even charges my automotive start battery if it gets run down.

I upgraded my 2003 Sportsmobile with a 300AHr lithium battery and needed a dc/dc converter, this one did the job. I'm very happy with Renogy products, everything works awesome now!

I bought this because I added a Lithium house battery to my camper. You need this charger or one like it because you can't charge directly off the alternator...you need to charge off of the truck battery. The charger is not all that easy to install because all the wiring and fusing required is a little challenging and you need to factor in the cost of the wire, fuses and connectors. If you are reasonably handy at stripping wires, crimping connectors, and using a multi-meter, it is doable but pay close attention to the wiring instructions. Never having done an install like this, I had a little trouble finding a fused circuit for the D+ that worked only when the ignition was on. I got it all installed and it did not work. I tested everything by isolating the elements of the system and concluded I had a bad unit. I contacted Renogy to make sure I had not missed anything and they gave me a few suggestions about the problem. After exploring their suggestions, it reaffirmed my assessment that the charger was bad. I contacted them again and they said send it in. It took about three weeks for them to receive, test and conclude that the charger was bad and they sent me a new one. The new one worked flawlessly and charges my 100amp battery from 0% to 100% in about 5 hours of driving. I am now happy with the charger and it fits my needs. The unit seems solid but I deducted one star because I got a bad unit which took me many hours to resolve the situation.

I got this for my van build. The sun doesn't always shine but the wheels keep a-turning! I would highly recommend this thing if you're built right for it. MAKE SURE YOUR ALTERNATOR CAN HANDLE THE EXTRA LOAD!!!! Aftermarket high output alternators highly recommended. This unit reliably pulls 48 to 50 amp and up to 700 w when it's really cranking. BE SURE YOU HAVE THE RIGHT FUSES AND OVERSIZED WIRE! If you disregard my warnings you stand the real risk of killing your alt and possibly burning yourself to the ground. It's a lot of juice. Handle it with respect. Do your math and your homework. Also keep in mind that a ton of heat is being generated at the charger. Make sure you have plenty of ventilation to dispell the excess heat and I would advise putting a couple cheap thermostat controlled laptop fans on it. They're like 6 dollars. This will help preserve the charger and prevent excessive heat build up in your cabinet. I actually put a large laptop fan in the air intake opening I put on my cabinet and another to exhaust the heat from the box. Otherwise It's very easy to hook up and required nothing special to hook up and fire up. Worth every cent. Just don't wing it , ok? It's not cheap and messing with this stuff without the right information and prep could cost you dearly.

Update: 8/2020 I used this charger a few times testing it out on short trips around town and it seemed to work great.,however, the morning of my first ever camping trip it stopped working. Leaving my cropped the entire time. Nothing changed. All wiring is good. When I turn it on it does nothing. I used it to charge my bank about 6 times. Never even close to depleted maybe 15% most. I will never buy another Renogy product again. They are garbage. Second device to fail me from Renogy. I have realized that every product I purchased from reboot has on characteristic. They are made the cheapest way possible, with profit at the forefront of manufacturing. You might think all companies do this but no. Reliability and return business are also factors. This chargers connectors function but we’re a pain in the but to work with. I guess they were a step up from the cheap set screws lugs I had on the controller I returned but still cheaply made. As a graduate who has been taught to a read critically I felt their manuals main priority was legal protection for the company and the focus with three or four pages of warnings and cautions and barely a sentence explaining important installation information. Lazy writing that confused more than helped. I returned my Renogy river charge controller for an Epever and am so glad. If I could have afforded a better DCtoDC charger I would have avoided thus one too. As I will rarely need this charger I decided to buy the Renogy but with no faith that I will depend on it. Still keep getting mixed information about whether thus device will drain my battery a couple customers have said yes unless I installed an isolator but this makes no sense. Renogy basically said yes if I turn it on without starting the engine. I installed this using the ignition lead going to my stereo amp but then bypassed it with a dash switch before feeding the device so when ignition is on AND my toggle it would work... well see. I plan on waiting until I am at freeway speeds on the road before ever flipping it on. I’ll update after some use. I didn’t go with the isolator. Seemed too much. I’d might else well pull out jumper cables as use an isolator.

they here haven't put it to use yet

I rarely leave reviews and in most cases only when I am really annoyed by a product. But this unit is really great at a very resonable price! Works very well, is compact, and has many great features that only a combined dual (solar and alternator) charger can provide. For example charging my starter battery when the solar battery is full. I think I had a small parasitic drain on the van which caused the battery to be empty after a few weeks of not driving. With the renogy charger that is no longer a problem. And of course the main function to support dual charging is also great. I specifically used the smaller version (30A) to limit stress on the alternator . That is probably the only missing feature I can think of: configure the max draw from the alternator in the app. But with the 30A version that is not really a problem. And I anyway only have 400W of solar, so 30A is fine.

Other than a issue with a TAX invoice as in they do not supply one a major pain In Australia if you want to claim the unit as a Business expense as is what i wanted to do. The unit is by far the best one i have tested so far. It does not just charge and cut off it also supplies power to the connected devices so as not to run the battery down when the battery is full and the sun is still shinning. So if you don't need to right this off TAX wise i would recommend it. So 5 stars for the Item 1 start for the seller.

All good

Super easy to install and charges really well. Renogy make incredibly well build products and I would highly recommend. It allows us to run the fridge when travelling in our trailer on battery power without running down the battery. You do need to ensure you run the correct wire gauge for the length of your run from your vehicle battery to the charger. I would also recommend to get the appropriate circuit breakers for safety.

I use this in my overlanding setup. I have a 24v system in my Toyota landcruiser and I needed somthing to connect from my 24v to 12v converter to charge an auxiliary battery. In my situation, my alternator puts out 24v, that will fry this thing. So! I wired it to the output of my converter (12v out). I asked the question before buying this and everyone said 'no it won't work'. I bought it anyway cuz my options were limited. Well, it works. My aux battery has been staying charged while I drive and my fridge freezer has been staying cold. Mission accomplished.

I've had this wired up in my vehicle for a few months and it's doing a great job. I've regularly seen it pushing over 40A through the battery. 45 minutes driving a day is enough to keep my fridge running 24/7. Knowing how fast I can charge the battery I wish I'd bought a smaller one!