http://www.grapesolar.com/docs/GS-PWM-40BT%20manual.pdfMax Voc 55v, you will be well under that(+/- 22.8v)
Mr Wiz took a cheap tablet and downloaded the app Grape sent, he plugs the tablet into the grape's usb port for power and ends up with a remote display and the added features of the app. One note is the usb follows the load timer, I had mine set for 3 hrs on at dusk and the USB had no power, set to on 24/7 and it had power to charge my phone.
older version at store
https://play.google.com/store/apps/details?id=com.shuorigf&hl=en
