We use this with a solar panel on our boat to charge the batteries.

I’m very happy with the result installing this MPPT solar controller, it is small and of very high quality, in my case I made a custom bracket to be able to have access to the fuse box in the future, the app works fantastic and very easy to understand too.

The 2 main problems are that:1. Its not accurate. The voltage reported at the battery is never what the voltage reported to the app is. Its consistently lower than the actual voltage. It means that if you choose the battery profile you are likely overcharging your battery. I had to manually lower the voltage profile to work with the actual voltage output. The good news is that you can change the parameters. The solar input is also inaccurate, claiming lower voltage than its actually getting from the panel and underreporting input.2. The load output is completely worthless, and perhaps even dangerous. It is ALWAYS live. even if you go into the app and turn is off, it's still outputting. Sometimes full battery voltage, sometimes half? It wont give you a consistent voltage when it is turned on either. It will power a solar generator because of the MPPT solar controller in that device, but it wont power a 12v fridge at all, not even to power up the display. Customer support told me its for small loads like lights and fans such, but it's listed as a 10A output in the manual.I reached out to customer support and they tried their best within the language barrier and eventually sent me a replacement unit to try which had the exact same problems.The app is interesting as it requires location permissions to see the controller which you have to connect to each time. The range when installed under hood is laughably poor, as in right at the edge of range from the driver's seat. The app does allow you to modify parameters and provides good data but its otherwise a pretty poor app experience.It's been reliable, in that it keeps providing my battery with solar power, but its required some careful adjustments to the charge parameters to keep from baking my AGM battery and the load output is worthless.

****** The Bluetooth app for this controller requires permissiin to your precise location. Why???****** Update after some more use and comparison to my old PWM controllerI hooked both my old pwm and the new lensun 10 amp controller to my battery, and then switched the solar panel from one controller to the other. I did this test on a cloudless day in late morning. The solar panel was perfectly aligned to the sun.The old PWM controller registered putting out 5.2 amps to the battery, which is exactly what my solar panel is rated for optimum output. The new Lensun controller put out 5.8. Both of these readings were taken using a hoop type ammeter. That's a bit low for an mppt controller.I also measured the input amps coming from the solar panel. With the PWM controller, it was 5.2 amps, exactly as expected. But for the Lensun controller, the amps from the panel was 4.8 or 4.9. I didn't expect that to be so much lower. Note that this is the same panel in both cases.The app reported amp numbers that were significantly lower than my meter. It reported 4.2 or 4.3 amps coming out of the solar panel (instead of 4.8 or 4.9), and 5.1 or 5.2 amps going into the battery (instead of 5.8).The app also reported a voltage at the battery of 14.16, whereas my meter reported 13.68. The app voltage was high, which is surprising, given that another reviewer said the app voltage was low.The app reports the signal strength of this controller as 1 out of 5 bars, even when your phone is right next to it. It also reports various other Bluetooth devices around you, and all those are 1 bar too.The signal strength of the controller is quite weak. Your phone has to be within about 6 or 7 feet of the controller for the app to run.The app reports battery percent full. In the early morning, after running the furnace fan all night, the battery status was reported as 91% full. But in reality the battery was much lower than that. When the sun finally came up, then the controller more accurately reported the battery as 61% full.****** End updateThis MPPT controller comes with all the wires and connectors needed for for the most common hookup, and a Bluetooth app for your phone. You don't have to go out and buy battery cables, or splice on new mc4 connectors for your solar panel.It is a true mppt controller, which converts excess volts to amps, so it outputs more amps to your battery than the amps coming in from the solar panel. The 10 amp controller is truly waterproof. There are no exposed wire terminals that get wet (but the 20 amp one looks different)The amps generated by the controller was 15% more than the amps coming from the panel by my measurements. It was 13% more according to the Bluetooth app. I was a little disappointed with these numbers because I had hoped for 20%, which is typical of other mppt controllers.Update: The controller is putting out around 20% more amps to the battery than it receives from the solar panel. So pretty good, and comparable to other mppt controllers.The app is a bit funky. It initially comes up with the main display screen, with all the touch points disabled. You have to swipe the whole screen right or left to get to the setup screen.The app setup requires you grant permission for the app to see your location in high accuracy. That's weird.The app shows you amps the controller is putting into the battery, amps coming out of the solar panel, and amps going into the load wires, if you use that feature. A fairly nice feature set.The controller uses 15 mA of power when the solar panel is not connected, which was the same as my old PWM controller that has no Bluetooth. Pretty good.The controller is tiny, 3.25" x 3.5" x 0.8". You can put it almost anywhere. The flange you bolt through to hold it in place is 3/16ths" wide. It will be hard to find a bolt small enough and strong enough to fit on that.The fuse on the battery cable is about 3" from the battery terminal. That means you have to leave it in the battery box, or splice on more wire to let it hang outside the battery box. Outside is preferable. Too bad they didn't add another 6 inches of wire.The crimp to the fuse feels like repetitive bending will break it. It probably should be replaced.The documentation is not very good. They do not document which mc4 connector is positive or negative. They say the positive wire is red, but both panel wires are black. The mc4 connector with the barbs on it was negative on my controller.

First of all, I bought this for experimentation and for use is a small solar power station using a lithium ion batter. There are zero controls for this controller except through the bluetooth app which is nearly junk. There are 3 LEDs that give you some indication as to what is going on with the unit but no real detail. The app is difficult to set up and is useful but vague information.The unit is very small -- smaller than the Amazon listing indicates. The battery wiring harness is OK and one of the reasons that I bought the unit. However, there an no screw terminals on the unit for anything. The PV input is via decent solar panel connectors but no other way to connect a panel without some surgery. I suspected that the PV panel inputs were mis-wired (reversed polarity) and there was no easy way to check that. It turns out that the problem was elsewhere and the revers polarity protection saved the unit from max-smoke. I decided to keep the unit as a back-up controller but will not use it in my power station (getting a Renogy 20A MPPT instead). The lack of controls except via the crappy app and the panel input connectors were the 2 main issues that convinced me that life is too short to tolerate this controller. But, did I mention that the battery wiring harness is good?

Easy and waterproof. 100% going to buy a 20 amp next.

I can monitor my battery life, load, and solar output to battery