I have some land that I am monitoring for theft with arlo camera system.

I purchased the following 2 - 20 watt solar panels 1 - mppt solar controller rover elite 20A 1 - AT&T hotspot turbo mobile wifi device 1 - arlo camera system spotlight essential 1 - 12v to 5v step down convertor to USB 1 - 7AH lithium battery with overload protection etc..

The turbo att mobile device can last around 15 hrs of time with the built in battery when fully charged.

I setup the two 50 watt solar panels on a tree and wired each positive and negative into the ports on mppt controller. I set the mppt to lithium type and 12v output I wired the battery and step down convertor into the battery terminals on the mppt controller. The step down convertor has a dual usb so i installed one camera and ATT mobile hotspot into it. The panels get about 7 hrs of pure sun when I am testing.

I keep having an issue where as soon as the sun goes down the voltage of the camera and att turbo battery level drop drastically like 50% power level from 100% and dies fairly quickly. I did not experience this with the PWM controller which is odd

I originally had a pwm controller cheap one from ebay running instead of mppt. that seemed to be doing a better job then this one.

I feel like maybe I wired up something incorrectly? Any ideas what could be causing so much draw of power? Should I switch back to a PWM controller instead of mppt? Would a PWM controller with usb ports be more efficient? Did I wire up something incorrectly causing it to draw phantom power?