We live full time in our RV and much of that is spent off the grid (no power hooked up), We have solar and do just great without the power, but this item helped us inventory all the power needs of full time life. We were able to determine what every single electrical device we have uses as far as Amp load and wattage. It also helped us determine the size generator we needed as back up to the solar and for running the larger items like the microwave, hair dryer, George Forman Grill, etc. Been using this for over 16 months and it works great. Easy to use and accurate. Highly recommend if you have similar needs.