Over 90% of the PV Power Systems installed are grid tied systems that use the grid rather than batteries to store and draw energy from during night times or low solar radiation. Grid tied Power Systems consist of
- PV modules which are normally roof or ground mounted and could be stationary or sun tracking
- Inverters (s) which convert the DC power delivered by the modules to AC power suitable for grid connection.
- Balance of System Components (hardware, wiring, disconnects, metering and NEC required components)
Using the findings and recommendations of the feasibility study the System Engineering aims at producing detailed engineering documents that can be readily used by PV module and electrical installers and contractors including :
Detailed work breakdown required for site preparation
- Engineering calculations regarding the static and dynamic loading of the installed modules which are heavily influenced by the site climatic conditions.
- If applicable site’s daily and seasonal shadowing maps
- Detailed dimensioned drawings for the module lay outs
- CAD Electrical drawings detailing module stringing, inverter(s) and combiner box (es) connections as well as connection to electrical panels, and if applicable further connection to transformers and the high voltage grid line.
- Details of system performance monitoring system
- Detailed Bill of materials
- Detailed estimated costs
- Application for grid connection permit from the local utility