the problem is this line
monitor.write( getEnergyStored(draconic_rf_storage) getMaxEnergyStored(draconic_rf_storage) )
you need to combine the two results as strings you do this like so:
monitor.write( tostring(getEnergyStored(draconic_rf_storage)).."/"..tostring(getMaxEnergyStored(draconic_rf_storage)) )
tostring is a function which will convert the number that is returned by you other function to a string so that it can be printed to the monitor
.. combines two strings
"/" just some formatting in the string to separate the two values
another things to note, I'm fairly sure that you are using your draconic_rt_storage incorrectly, it should be more like a peripheral (like you did with the monitor)
Edited by Lupus590, 02 February 2016 - 12:01 PM.