I recently added solar panels and an MPPT controller for the panels. I then installed this wall charger in my camper trailer and connected it to the MPPT controller's 12v auxiliary output. I was able to charge my phones. Kindle and all other 12V devices offline for a whole week. For the installation I used a standard single installation box. I had to get my own screws to attach the wall charger to the box as they weren't supplied. However, it worked great!
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