I needed a way to control the voltage of my 100Ah AGM battery connected to a charge controller and a 100W solar panel, now I can by do from my mobile phone . READ THE INSTALLATION MANUAL several times, otherwise you will have problems like me. I wanted to cancel the installation. I had to uninstall the app 3 times because I didn't get a confirmation email and couldn't set up WiFi. You should follow the instructions in order and then check your junk mail folder for a reply email. Now when I use it for a week, sometimes the app forgets your password and you have to enter it. If you see the "Save with password" option, make sure you select it. Now I'm happy with this device, although the app is a bit wonky. Without it I would use a voltmeter on the battery and still not know what percentage remains to be charged. I am happy with my purchase.
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