local reactor = peripheral.wrap ("back")

local MAX_RF = 10000000

local MIN_LEVEL = 0.2
local MAX_LEVEL = 0.8

while true do
    local rf = reactor.getEnergyStored ()

    local percent = rf / MAX_RF
    if percent < MIN_LEVEL then
        reactor.setActive (true)
    elseif percent > MAX_LEVEL then
        reactor.setActive (false)
    end

    sleep (1)
end