while true do
  local reactor = peripheral.wrap("BigReactors-Main_Reactor")
  local low = 1000000
  local high = 10000000  

  if reactor.getEnergyStored() <= low then
    reactor.setActive(true)
  end
  
  if reactor.getEnergyStored() >= high then
    reactor.setActive(false)
  end

  sleep(5)
end