Along with this that drives this air compressor is a 2HP copper wound motor, this is where the weight comes into it as the motor itself weighs 19kg. This is the easiest way to know if your oil-less motor is an actual 2HP. Being an Oil-Less Air Compressor it doesn't matter about the parking level too! compared to oiled Air Compressors. Drawing an impressive 6AMPS compared to 8AMPS on other models this is well suited for low voltage areas! In standard environment conditions when your air compressor reaches 14 PSI you have reached the volume of air in the receiver!. So on this particular model (PO13TT) at 14 PSI you have 18L of compressed air in the tank. At 28 PSI you now have 36L of compressed air in the tank. So if the cutout pressure is 112 PSI, you now have 144L of stored compressed air! Who said small tanks don't hold enough air? As mentioned this can be affected by the temperature and other factors. Smaller tanks also equate to quicker air recovery times of lost pressure along with the lower operating temperatures of the pump. Please note: air compressors i.e piston type, are not designed to run continuously they must cut in and out. Direct drive models should only have up to a 40-50% duty cycle. Belt Drive hobby models are up to 60-70% and full industrial belt drive models are up to 75-85%. If the compressor runs over these duty cycles it could cause failure. Important - first check voltage on each building site as low voltage will cause the motor to fail on all compressors. It must have been better than 230 volts at peak times. Extension leads will cause a voltage drop, it's better to use an extra air hose.