Unbound Solar has a nice breakdown of the best grid-tie and off-grid solar monitoring systems on the market. The page lays out brief descriptions of how the tech works and then discusses pricing and features (with links) for offerings from Enphase, SMA, SolarEdge, Magnum, Midnite, Morningstar, Outback and Schneider. Includes info on compatibility with inverters, data storage, and smart phones/4G.