Solar Power Manager 5v - When does USB power activate?

I picked up a Solar Power Manager 5v, plugged up the LiPo 3.7v and device to USB-A. Charging power is provided through micro-usb-in. It's been charging a few hours now but the USB-A device has yet to turn on. It works just fine with the same cable plugged into any other power supply, and turns on when I disconnect the battery.

Should the controller not be trickle-charging the battery while also powering the USB port? Is there maybe a charge threshold the LiPo needs to reach before the controller kicks on the USB power? It's a 8000mAh battery, so that just might take a long time.

Thanks for any help!