wired = peripheral.wrap("back")
leftCell = peripheral.wrap("left")
rightCell = peripheral.wrap("right")

function request(amount)
    local cons = wired.getNamesRemote()
    for k, v in pairs(cons) do
        local pipe = peripheral.wrap(v)
        if pipe then
            local id = pipe.getAvailableItems()[1][1]
            pipe.makeRequest(id, amount)
        end
    end
    sleep(1250)
end

function checkEnergy(threshold)
    local leftPercent = leftCell.getEnergyStored("left") / leftCell.getMaxEnergyStored("left")
    local rightPercent = rightCell.getEnergyStored("right") / rightCell.getMaxEnergyStored("right")

    if leftPercent < threshold or rightPercent < threshold then
        request(1)
    end
end

while true do
    checkEnergy(0.95)
    sleep(5)
end