Renogy 50 Amp MPPT Charge Controller 12V MPPT Solar Charge Controller, Capable for Solar Panel and Alternator Power Input, with DC to DC Battery Charger Function, for Gel, AGM, and Lithium Batteries

Works as advertised. Takes input from the solar panels or the 12VDC aux from the 7pin trailer connector. We can now charge the trailer battery when on the road.

Recharges batteries while driving fast and handles my 120watts of solar NP. Way cheaper than buying them separately unless you have more than 400watts of solar. I’ve used it for 2 years now and have had no problems. Being able to monitor on phone is super handy. I would highly recommend this DC charger if you plan on using solar as well but it’s still a good deal for a 50amp dc-dc smart charger. Love it!

This controller works very well! I especially like the optional bluetooth for charging status !

This is my second one. It’s easy to set up and does what it’s suppose to do. Easy peasy

This unit basically shuts itself on and off every 5 minutes to check to see if there is enough solar to charge. That's not very efficient when alternator charging. Adding a relay that closes the solar input when driving eliminated the issue.