A Raspberry Pi would be enough for internet access, they run at about £60 if the school can scrabble up a USB keboard, mouse and HDMI monitor https://thepihut.com/products/raspberry-pi-3-starter-kit?variant=30817948433&gclid=CjwKCAiAxJPVBRB4EiwAsCA4aVWuwX4jJU41aNOSU4ZGRdqI-vwXX_AUbN1TGI1HXt0MvwPwFTasvhoC6m4QAvD_BwE#fo_c=1889&fo_k=accffd44112b0c43afdf952942d34263&fo_s=gplauk
Look at what the Turing Trust are trying to achieve, solar powered classrooms http://turingtrust.co.uk/the-turing-trust-e-library-2/the-solarberry/
our whole budget for this first step is 40 SBD, that item may or may not be available down there. Thank you for your comment and support.
It would also be an excellent educational resource for schoolkids! It's also only half the the cost, so twice as many could be made available for the same effort.
Great idea!