As he’s built up his Minnesota nonprofit that installs solar systems for low-income households, Jason Edens, this week’s InterActivist, has gone from solar activist to solar expert. And it’s a good thing: readers this week barraged him with questions about all things solar. He shines a light on topics ranging from DIY solar-system installation to solar ovens — and he’s got the scoop on web resources and other tools that can help you calculate your solar-power potential as well as costs, savings, emissions reductions, and more.