Solar Sentry provides instrumentation and web-based diagnostic services for developers of large solar electric sites. We help them maximize their financial return and minimize risk. Commercial-scale solar electric sites today are under-performing financially due to a lack of information from, and effective management of, the solar array. This costs the owners a significant percentage of their bottom line. Our patented panel-mapping technology includes cost-effective embedded instrumentation that requires virtually no installation effort or expertise. When connected to the internet it 'calls home' and continuously communicates diagnostic and performance information via secure data channels. Our server-based analytic software can pinpoint the exact location of array failures and underperforming solar panels. We use this information to optimize site performance and minimize maintenance cost with a data-driven combination of cost-effective repair and automatic problem mitigation.