Review on 🔌 Efficient EPEVER 40A MPPT Solar Charge Controller 12V 24V Auto - Maximize Renewable Energy Output with 40 Amp Negative Grounding, 100V Input, Lead-Acid and Lithium Battery Support, Load Timer Setting by Chris Santos

I would give this controller 5 stars but I can't because of the software that needs to be downloaded if you want to use it. The controller itself looks pretty decent. I've only been with them a few days. I'm changing from PWM to MPPT. I installed them side by side. The panels are connected in series for 24 volts and the batteries for 12 volts. There are 2 panels in series (x2) to two controllers (530W per controller) and 4 panels (2 in series, 2 in series) in parallel (920W per controller) to the controller. The controllers don't even seem to get warm with this setting. 2 controllers with 2 panels receive different amounts of sunlight at different times of the day and are far apart. Connecting to the same controller is neither convenient nor practical, so I used 2 controllers. The battery consists of a 10.6 volt Trojan L16E wired at 12 volts. I'm charging at the moment with about 70 amps. Yesterday the charge current slowly dropped until it became slightly higher than the current consumed by the house. I believe that's how it should work and I was happy with it. I will be adding 8 more panels of 300w each and buying a higher amp version of this controller for them. Now about trifles. They could give you more options in mobile applications. There are a limited number of things you can do with apps, but there can be more. I wouldn't complain at all about the downloadable software if the app was more versatile. The remote still has a limited number of things you can do. The manual says you can change the AH battery with the remote but I couldn't do that and you can't do it with the app. Now for the bad. Software. I have downloaded all three programs shown: spp v1, spp v2 and pc tools. Neither of them wanted to connect. The installation guide contains step-by-step instructions for setting up the software. I followed him to the letter "T" and didn't go. I tried for an hour. Suddenly, for no reason, he connected. I sat down at the first controller. and everything was fine. I installed the software for the second controller and it didn't connect. I set the device ID and everything is according to the instructions. I've tried different cables and different laptops, no joy. Eventually he connected for no apparent reason. I sat down at the second controller. The third controller did the same thing, didn't connect, then it just connects like that. The 4th controller was the same, then connected for no reason. At that point, I could go from controller to controller, checking and adjusting. Software allows a lot WHEN IT RUNS. Oooooh…. This morning I get up and plug in my laptop and I can't connect to anything. Tried and gave up for an hour. I'm a former IT guy at a national cable company. and I have to say that they have to start over with the software. So the bottom line is, if you're looking for a good controller, this one is pretty good for the price. If you buy it with software, look for other hardware. I hate giving bad reviews. When I find out the software I will fix it. With today's technology, it would make sense to have a system that would allow controllers to talk to each other to share settings and status. It would be a great system. Enough for now. As promised, I am revising my review. I increase the stars by one. I bought a 60 amp version of this controller to complete the install. I also bought a Windows 7 laptop from E-Bay. The EPSolar software works fine on a laptop running Windows 7. I could not get a stable connection to Windows 10 unless I removed all previous controllers from the software and started over. Even then, it was dubious at best. I have repeatedly connected and disconnected to a Windows 7 laptop with no issues. I would like future versions of the app for Android and IOS to have more options and allow more editing of controller settings. In general, I like controllers. I use 4x 40 amps and once 60 amps in a 4.7 kW system with no problems. My batteries are fully charged before noon and on a cloudless day and then the regulators loosen up and just give the power they need to work. Actually quite nice.