i have a mysolarbackup "HUB" and it has 2 150watt panels and 3 huge batteries. It works with power tools and TV's as well as giving my computer and household items power. It also can have a wind generator hooked up to it. It works well with the sun and wind . I dont know what all the fuss it. Its a self-contained unit and works just fine. I think its a well made well thought out unit.. ask to speak to Mr. Fink @ mysolarbackup and ask him any questions you like. He made the darn thing. He is very kool and helpful. It works for me.