Renogy 12V 30A DC to DC Charger with MPPT, On-Board Battery Charger for Gel, AGM, Flooded and Lithium Batteries, Using Multi-Stage Charging, Charger for Solar Panel and Alternator, in RV, Car, Marine

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.

All u need in one device for your off grid setup

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.

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! Update: It's been three years and the charger is still running strong. While it did great in its original solar/alternator hybrid time, I decided to run it as a dedicated charger off the 220 amp alternator in my rig and it worked just perfectly. Set the maximum output to 10 amps using the Renogy app over the (sold separately) Bluetooth connector and it'll do that all day. Crank it up to 50 amps and it'll manage when to output that amount as demand and battery state of charge allows. Never an issue with this device. I only wish all Renogy products were as reliable.