Same as the On Grid Systems, either roof top or ground mounted systems are possible. Similar considerations regarding the roof and the site as in On Grid systems apply.
In addition to solar panels, inverters, racking or mounting structures, and contrrol and monitoring mechanism, the Off Grid systems are supported with backup batteries for electricity storage, in order that there will be electricity during evenings and night time. For economic and total independence in power generation, CHP (Combined Heat and Power) generators can be included.
Again, each site is different. In addition, the local utilities and authorities also vary from city to city, or from country to country. Therefore, the detailed design of each system is inherently different, from panel array layout, electricity wiring, to mechanical designs. Professional judgement, design and experience are critical to the successful integration of latest technologies and of highest power generation, as well as the reliable performance of the system in the coming decades.