rstest

local component = require("component")
local pc = require("computer")
local sides = require("sides")
local rs = component.redstone
maxEnergy = pc.maxEnergy()
chargeTo = 95

function rson()
  rs.setOutput(sides.left,15)
end
function rsoff()
  rs.setOutput(sides.left,0)
end

function round(num,numDecimalPlaces)
  local mult = 10^(numDecimalPlaces or 0)
  return math.floor(num * mult + 0.5) /mult
end

function updateEnergy()
  currentEnergy = pc.energy()
  chargeState = round(((currentEnergy / maxEnergy) * 100),2)
end

updateEnergy()
print(chargeState)
if chargeState <= chargeTo then
  rson()
  while chargeState <= chargeTo do
    os.sleep(1)
    updateEnergy()
    print(chargeState)
  end
  rsoff()
end