powergui

gui = peripheral.wrap("top")
modem = peripheral.wrap("bottom")
cells = modem.getNamesRemote()
lastTotal = 0
maxPower = 600000*(#cells)
gui.clear()
box = gui.addBox(95,25,50,14,0xffffff,.2)
label = gui.addText(100,30,"",0x000000)

function round(n)
    return math.floor(n*10)/10
end

while true do
    sleep(1)
    total = 0
    for i,v in ipairs(cells) do
        total = total + modem.callRemote(v,"getEnergyStored")
    end

    powerNet = round((total - lastTotal) / 20)
    powerPercent = round(total / maxPower * 100)

    text = "POWER: " .. total .. " (" .. powerPercent .. "%) NET: " .. powerNet
    label.setText(text)
    box.setWidth(gui.getStringWidth(text)+10)
    lastTotal = total

    --if #(gui.getAllIds()) > 2 then
    --  gui.clear()
    --  box = gui.addBox(95,25,gui.getStringWidth(text)+10,14,0xffffff,.2)
    --  label = gui.addText(100,30,text,0x000000)
    --end
end