LiTime 12V 40A DC-DC Battery Charger with MPPT Solar Controller, Dual Input Smart Charger for 14.6V LiFePO4 Lithium Batteries, Fast Charging for RVs, Campers, Trailers, Solar, Home Backup and Off-Grid

I have been using this 40amp DC-DC charger for 10 months now and it has been great. Works like it should and has been trouble free. I dont use solar so I cant judge that and I havent yet used the reverse charging so I dont know about that but I really hope that feature works. I have a 300amp alternator and a 300 amp hr battery. I like it very much

Connected this to my truck battery with fused 4 gauge cable. Used 2 gauge cables to the parallel 100ah batteries which power my 1500W sine wave inverter. Used breakers between connections for safety and peace of mind. I charge the battery bank while driving. **One caveat: this LiTime 40A dc-dc charger gets very HOT**. I now aim a fan at it while driving/charging my battery bank to help cool it. It charges my batteries very quickly and has gotten me out of a pickle while out camping with very little sun/solar availability! This system is now self-contained as long as I can run the truck engine. I have all the comforts of my home kitchen including fridge, microwave, toaster, instant pot, induction cooktop; cabin heater, air filters, electric blankets and heating pads. A true “glamping” experience!

I’ve bought many LiTime products in the past and have been very pleased with their quality, reliability, and performance. I should’ve read the specifications more closely before purchasing it. After receiving it, I realized that it is limited to a solar panel Voc of 26V. Most panels are substantially higher than this making this unit not very useful to me as a MPPT controller. Yes, the Voc limit is indicated in the specifications way down the page, but considering that the Voc is as low as it is, the manufacturer should do a better job of stating this more prominently. Anybody that’s moving 40A around to charge and recharge batteries is probably going to be using panels with a Voc of at least 30 to 40 V. Because of the need to protect against high Voc on a cold day with full batteries, I would expect a 40A MPPT controller would have a max Voc of at least 50 V. Nonetheless, because I did not read the specifications more closely and I was in a hurry to get my DC to DC battery charger installed, I’ve decided to keep the unit and hope to find one or more panels in the future that have a low enough Voc that I can use them as well. UPDATE LiTime contacted me after I posted this review and offered me a full refund if I was not completely satisfied. This is an example of the kind of excellent customer service I have experienced from LiTime in the past. Because it was basically my error not to be more diligent when purchasing this, I have updated my review to soften my criticism and I have decided to raise my review from 3 to 4 stars. This was my decision alone and LiTime did not pressure me to do this in any way. The unit I purchased is exactly what was advertised and performs well doing the most important function than I needed: DC to DC charging. Just make sure that if you plan to use this as an MPPT controller that you have panels with a Voc of not much over 20V, otherwise you risk damaging the MPPT controller on a cold sunny day.

Amazing device. It was so nice to put solar and alternator through one device. Very small considering what the competition looks like. I've only been using it a few days but it's performed perfectly on both alternator and solar so far. I do wish it had some monitoring capability either through an integrated Bluetooth device or a module like renogy but there are other ways to monitor.

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