Hello, I live in the country with a pretty crappy power grid. My power goes out at least once a month and already fried a modem with way even with a surge protector. I wanted to get a UPS just so i jave enough time to shut down my pc, modem and router. I was reading that I need Sinewave but I see conflicting info online and the review on Amazon.ca and wanted to get some input on recommendations. Id rather not spend the 200 plus for the ones that are sinewave but will if its 100% necessary. Thank you for any help.