Completely solve the hot bed power is too large and the load current issue.
Under the premise of normal cooling, it work stable under I(Max)=20A, the current must not exceed 20A while the process working.
If you need anything greater or equal to 15A, this module is a must! For example, if your total power usage is 240W and you have 12V power supply, then it means at least 20A is needed (20 * 12=240W).
As ChiTu controller board is only capable of 15A this setting will not work. To make it work, you need this extra power module.