Renogy 12V 50A DC to DC Battery Charger with MPPT, On-Board Battery for Gel, AGM, Flooded and Lithium Batteries, Using Multi-Stage Charging, Solar Panel and Alternator

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.

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 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.

Renogy will not pay shipping for a warranty inspection. They got all the info proving their dc to dc controller quit working in less than a year. Why spend money on shipping at all? When I can use that money for another brand with better warrantee! Renogy keeps telling me to repeat things like disconnect and reconnect, the easy stuff over and over again. I sent them videos, pictures and a long audio explaining of all the voltage checks. They are wasting many weeks of my time. I will keep updating but this is rediculous. No customer would want their product after all this unsuccessful replication. Update again! I already sent a long audio, long video, and many pictures. There is nothing left that they have not evidence for. I invite them to come look listen and feel the whole thing for themselves. I have had enough repetition. I already explained how it will not work under any circumstances. Udate: I have no idea what IBAN, SWIFT, & SORT CODES are for getting a refund! They still have not clearly addressed my question about fees, restocking fees, possible shipping fees, and who knows what other surprise fees.

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 like this controller however it’s limited to a max solar power of 25 VOC which was a little misleading in the listing on Amazon. It does handle the alternator from the truck of my 2022 Thor Omni motorhome, which makes it a better product. Just wish it could handle more solar power.

Not sure why this product is so unusual in the market. Having both vehicle power input AND a solar power input is very helpful to say the least! Came with some nice accessories like terminals and a nice ALN fuse holder. Hooked up easy, does what it says it does. I highly recommend getting the BT2 accessory. I could see that one of the solar panels I bought was defective. I would have not been able to detect that without it. ALSO, I can use the phone app to set a MAX charge current. That is very helpful for when I want to charge my power crate off of a car cigarette lighter socket etc. My project is intended to run a remote office while camping in remote areas. The charger fills a 100Ahr Lithium battery. Inverter is just a little 400w unit. I used a 50A Anderson connector for the vehicle power input and a 30A Power pole for the solar hook up. If I added more solar I would upgrade that. I have a power disconnect switch on the battery to isolate the system when not in use. Enjoy.

I bought this to replace my previous model Renogy (that I accidentally burned up by overpowering it with solar) and its been running strong since June. I like having both the mppt and the alternator charging in one unit especially with the size constraints of my battery box. Pretty easy to install, a lot more fault tolerant than the previous model and I'm happy with it.

Installed in a bus conversion to take advantage of the alternator charging my LiFePo4 batteries when the engine is running and being able to trickle charge the starter batteries while parked. Seamless installation, robust connectors and after I ordered and installed the BT-2 hardware, the app provides all the pertinent information in real time. Time will determine the durability of the device, but it's working great thus far. Cheers!

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'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!

Looks good quality but haven't installed it yet.

The Renogy 50A DC to DC On-Board Charger with MPPT is a solid option for dual battery setups, especially for those running solar alongside vehicle charging. It delivers stable charging and integrates well with most systems. The build quality feels durable, and the MPPT functionality helps maximize solar input. Installation can take a bit of effort, but once set up, it performs reliably. A decent product overall for off-grid and overland power needs.