I explain how the calculation should be done and what are the variables to consider, which you should know or find out as a user. 1- I need to know what compression force I need to make a cardboard bale as you want (I, particularly, I don't know). This will tell me what minimum piston diameter I need, taking a given working pressure, which must be less than the max pressure delivered by the pump. Playing with these variables you can determine them, it is not convenient to work with very high pressures (your equipment delivers 175 bar, a relatively high pressure) since the hoses and connectors have prices that depend on the pressure they endure. industrially in gral 80 bar is taken. 2- you talk about a cylinder of 80 to 100 cm of stroke, that will give you a filling volume. Depending on the filling time, you will get the FLOW from the pump you need. If you want to make a bale in 2 days the team is very different to if you want to do it in 2 seconds. (Obviously, in the first case your flow would be very low) 3 - multiply the pressure by the flow rate (in addition to some correction factors) and get the power you need, that is, the power of your electric motor in this case (do not confuse power with voltage, in your motor the voltage is 12 v, the power does not indicate). There is no way for a team of endless tons !!! in that case you could make a black hole that absorbs the world we know and that would be terrible !!