• Take the enclosure and remove the cover with a screwdriver
• Pass the big cable through the central cable gland as you face the enclosure with the cover removed and the cable glands at the top.
• Pass the short antenna through the right hand cable gland (this is unused, it's just to block the hole)

• Pass the long antenna through the left cable gland.

• Connect both the + (red) cables from the battery holders to the bat + terminal on the Solar1 charge controller
• Connect both the - (black) cables from the battery holders to the batt - terminal of the Solar1 charge controller.

• Insert the batteries into the holders
• Place the battery holders to the left of the enclosure. Secure with adhesive silicone.

• Connect the wires  from the plug that came with the TTGO board to the + and - load output of the solar charge controller.
• Use a lump of silicone to attach the solar charge controller to the right-hand side of the enclosure.
• Connect the +/- wires from the large cable you passed through the cable gland to the +/- terminals on the solar charge controller.
• Connect the plug to the TTGO dev board.
• Screw the TTGO dev board to the long antenna. Spin so it does not foul the lid.
• Check that the screen on the dev board is showing some information
• Tighten the cable glands

• Attach the 10w or 20w solar panel to the cable you have passed through the cable gland.

• Put the solar panel in the sun.
• Connect to the Wifi network that has been created and visit 192.168.4.1 in a browser, or launch the Android app and connect to Bluetooth if you have re-flashed the device.

Portable node

It should be possible to make a portable node from this box and this power bank but this is untested.