Solarly is a free advisor that answers one sharp question: would a plug-in solar panel on your balcony actually pay off? Enter an address and Solarly pulls the real solar resource for that exact spot from NREL’s PVWatts model, shows your building from above in live aerial imagery, checks how your state treats plug-in solar, and recommends a kit with honest payback math. I designed and built the whole product, and it’s careful to tell you what is live data and what is an estimate.