power savings

hi ya all .   i have orangepi one with armbian set up as web site server ... All good seems stable and cool despite being housed in the little cardboard box it arrived in.

Now because I am on alternative power and sometimes this is in greater supply than others I would really like to reduce power consumption as much as possible

Not interested in reducing processor power or memory speed or other things that may impact on its primary task of serving web pages and processing php.

however the only connections to the board are ethernet and power I do not want or need any graphics camera USB or whatever nor do i need any services other than ssh and html.

can I disable the HDMI interface? the graphics engine? USB support? LED's ?       and where is the script that loads all this stuff

any solutions or just pointers on where to start looking would be great

Thanks