In the existing Microgrid (MG) market, the technology (MG controller) mainly focuses on operation and management of MG with large size (such as campus/industrial/community etc.) and the generation resources generally involves diesel at least and other renewables (such as PV, wind turbine, Fuel Cell) and storage units. However, MG technology enabling to support a specific critical facility like, for instance hospital, police and fire department, wastewater etc., is overlooked due to the fact that an UPS unit or standalone generator is always used as a backup power supply and there is no real operation and management for this critical facility. With the integration of renewables in particular PV in this critical facility, it is essential to develop a suitable MG control system offering a completely autonomous and self-sustained MG System. This communication paper presents a GE MG solution aiming to develop a MG control system for a small battery-based (Solar-Plus-Storage) MG to support any critical facility with increasing penetration of PV. The expected outcome is to provide some industrial insights and engineering construction experience for Solar-Plus-Storage type of MGs.