I have a motorhome with two deep cycle batteries for a total of 200ah. I purchased this shunt and the powermon device. I separately purchased a 100amp fuse as noted in the installation diagram as a requirement. I had my service facility install the fuse and shunt, as well as make up the necessary heavy duty cables. I then installed the powermon device and bluetooth app. Despite the extra expense for professional installation of the high amp components, I am completely satisfied with this quality system.
So far so good! Everything seems to be working as expected.
Works as expected! Good quality.