text: Ok, we have a 40' trailer in a campground that during peak season has power issues with the voltage dropping well below 110v. I wasn't sure how or what this would do to the situation, but after plugging it in and comparing the voltage before and after, i was amazed. turn the microwave and the ac on, and this compensates to keep the voltage constant. If you have a trailer, you need one of these, it is well worth the money and will help protect your investment.