40A MPPT Solar Charge Controller for 12V 24V Solar Panels

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1. Doug Large Verified Buyer – 20 September 2024

   I just received it, and have not put into service yet.
   It appears to be well made, and the heat dissipate fins are very sturdy!
   

2. OCMerrill Verified Buyer – 22 November 2024

   Super easy to use, draws very little amperage overnight while idle if any. Very happy with the LNEX and would recommend.
   

3. BAOYU DING Verified Buyer – 11 January 2025

   Works great, I love it.
   

4. Mike Verified Buyer – 13 February 2025

   I really want to like this thing, but it simply does not work. Almost every morning as it is trying to get started with weak sunlight, the CPU crashes causing blank display, frozen display, etc. and no charging. It must be reset by disconnecting the array and the battery to reboot it. Then, if that’s any consolation, it will charge perfectly all day but you’d better be around the next morning to do it all over again.

   This is a replacement for the first one I owned which did exactly the same thing so I returned it under warranty. I think this is a design fault or software bug. Save yourself the headache and buy a major brand for not much more money.
   

5. John Corson Verified Buyer – 16 February 2025

   Although my time testing of the LNEX 30 amp MPPT charge controller has been limited, my overall experience has been extremely positive. When taking this controller out of its well packaged box, I was immediately impressed with its solid feel and finish. It is radially apparent this is a serious and high quality product. The included instructions are informative and well detailed. To initially power and setup the unit, I connected it to a 20 amp, 12V battery. This was easy as the wire terminals are well made and hold tight. Once powered up I set the system parameters for my LiFePO4 batteries. This was incredibly easy and a refreshing change from most charge controllers I have used. The entire process took less than two minutes after a momentary glance at the instructions. Basically, it required nothing more than pressing the set up button, selecting 12V, pressing the button again and selecting battery type, (LFP) in my case. Once connected to my 380 Watt roof top array, the controller provided a solid 21+ amps (315W) of current to a 165Ah battery. It maintained a constant 215Wh load, (TV, cable box, modem/router) via a 100W inverter for over four hours. During this time the controller carried the load and actually recharge the battery back to 100%. Operationally, this is the best non-Bluetooth charge controller I have ever used. It has two buttons, a solar panel button (PV) and a battery button. Each only provides information associated with its component. This is much easier than cycling through an endless loop of numbers, never being sure which parameter you’re looking at. In addition, this controller allows you to continuously monitor any parameter as it does not automatically default back to battery voltage, as most others do. All this, combined with an easy to read, well back lit screen, and useful icon information displays, makes this an extremely user-friendly charge controller. Overall, this is a outstanding, high quality MPPT charge controller. I have “big name” controllers costing 20 to 30% more, which are vastly more difficult to setup and use. Anyone looking for a 30 amp charge controller should have this one at the top of their list.

   

6. TexKen Verified Buyer – 9 April 2025

   HEAVY DUTY 30A Controller. I really like this thing. It is chunky, well built and works great. I hooked it up to one of my solar panel sets and tested it out. Like with most controllers, be sure to check polarity of your cords/battery extensions, etc. when hooking up. It literally took me minutes to set up. I hooked the battery up and then connected the solar panel and all systems were up and running. The controller does a boot up system test and then started charging the battery. I tried it on a small 7 AH LIFEPO4 and then hooked it up to my 100 AH LIFEPO4 battery and it is a smooth operator. The controller works on both 12V / 24V and has an auto mode and manual mode for both the solar panel and the battery you are hooking to it. I manually set the battery to LIFEPO4 by pressing the setting switch for 3 seconds while I had battery indicator selected. You just select the battery voltage and type and exit the menu. Piece of cake. This is one of many controllers I own. Some of the controllers are in go-boxes for remote power and a couple other higher-end chargers are more permanent mounts. This one will be a permanent setup at my remote office. I am pairing it with a 100 watt panel and will use it to keep a 100AH battery charged for emergency power. I keep ham radios, a computer/monitor, USB lights and a few other essentials hooked up at the remote for emergencies. This controller will work great for that. Price is reasonable for the quality of the controller. I would recommend this!