energyMonitor

local cell = peripheral.wrap("bottom");
local energy = cell.getEnergyStored("north");

local monitor = peripheral.wrap("top");

while true do
    local newEnergy = cell.getEnergyStored("north");

    local delta = (newEnergy - energy) / 20;

    monitor.clear();
    monitor.setCursorPos(1, 1);
    monitor.write(delta);

    energy = newEnergy;

    os.sleep(1);
end