Solar Energy assets like Solar Panels, Inverter Shelters are subject to threats from Fire, Burglary, Tampering etc. Typically Solar Energy EPCs do install Fire Alarms and access control. I think Intrusion Detection is also equally important. We have integrated Intrusion+Fire Detection system which can be connected to Central Monitoring or SCADA.
Access Control can be made more secured. It is possible to generate one time pin which will be sent through mobile and provide access using the pin rather than using costly access control system.