How do I set up SCADA software for real-time telemetry from inverters, sensors, and remote solar sites?

To set up SCADA for real-time telemetry from inverters, sensors, and remote solar sites, think in layers: field devices → communications → SCADA platform → data models/alarms → dashboards/integrations → operations/security.

1) Define what you need to monitor and control

Start with a clear list of signals for each asset type:

Inverters

Typical points:

• AC power, DC power
• Voltage, current, frequency
• Energy produced today / lifetime
• Status, fault codes, warnings
• Temperature, power limit, curtailment setpoint
• Availability / uptime

Sensors / weather stations

• Irradiance (POA, GHI)
• Module temperature, ambient temperature
• Wind speed/direction
• Soiling, humidity, pressure
• Rain gauge
• Battery/fuel level if remote power is involved

Site infrastructure

• Breakers, relays, transformer temps
• Metering (revenue meter, utility meter)
• Grid import/export
• Security/door alarms
• UPS/genset status
• CCTV alarms if integrated

Define:

• Polling frequency: e.g. 1–10 seconds for critical inverter values, 30–60 seconds for environmental data
• Retention: high-resolution short term, summarized long term
• Alarm thresholds: hard faults, warnings, comms loss, performance deviation

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2) Choose the communications architecture

Remote solar sites often need different network paths depending on location and bandwidth.

Common options

• Ethernet/Modbus TCP for inverters, meters, gateways
• Modbus RTU over RS-485 for legacy devices
• DNP3 for utility/SCADA integration
• OPC UA for modern industrial interoperability
• MQTT for lightweight telemetry from edge gateways
• Cellular (4G/5G), radio, fiber, satellite for remote connectivity

Recommended pattern for remote sites

Use an edge gateway/data logger at each site:

• Talks to inverters and sensors locally via Modbus, RS-485, Ethernet, CAN, etc.
• Buffers data when backhaul is down
• Publishes telemetry to central SCADA over VPN/secure channel
• Can perform local rules/logic and control

This is usually better than trying to connect every device directly to central SCADA.

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3) Select SCADA software and architecture

You can deploy SCADA as:

• On-prem server
• Cloud-hosted
• Hybrid
• Distributed with edge nodes

What the SCADA should support

• Multiple drivers/protocols: Modbus, DNP3, OPC UA, MQTT
• Tag database and historian
• Alarm and event management
• Role-based access control
• Dashboards/trending
• Scripting/logic for derived points
• Reporting and API access

Common architecture

1. Field devices
2. Site controller / gateway
3. Central SCADA server
4. Historian/database
5. Web HMI / operator screens
6. Integration layer to EMS, CMMS, ERP, BI tools

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4) Build the tag database and data model

Create a standardized naming convention so all sites look similar.

Example:

• SITE01_INV01_AC_POWER
• SITE01_INV01_STATUS
• SITE01_MET01_EXPORT_KW
• SITE01_WX01_IRRADIANCE
• SITE01_COMMS_GATEWAY_UP

Include metadata:

• Device type
• Site ID
• Protocol
• Units
• Scaling
• Alarm limits
• Timestamp source
• Quality/status

Best practice:

• Normalize units and scaling across vendors
• Separate raw values from calculated values
• Keep a device-to-tag mapping document

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5) Configure device communications

For Modbus devices

• Set slave IDs, baud rate, parity, stop bits
• Confirm register map from vendor
• Verify scaling, endianness, signed/unsigned values
• Define polling rates carefully to avoid bus overload

For Ethernet devices

• Assign IPs, subnet, gateway
• Confirm port numbers and protocol settings
• Use static addressing for site-critical equipment where possible

For remote gateways

• Configure:
  • Local device polling
  • Store-and-forward buffering
  • Time sync (NTP)
  • Secure tunnels/VPN
  • Heartbeat/health monitoring

Test each connection individually before commissioning the full site.

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6) Set up alarms, events, and notifications

Define alarms by priority:

• Critical: inverter trip, site offline, grid fault
• High: repeated device faults, comms loss > X minutes
• Medium: low irradiance vs expected, sensor fault
• Low: maintenance reminders, minor warnings

Configure:

• Deadbands and delays to avoid nuisance alarms
• Alarm acknowledgment workflow
• Escalation via SMS/email/app alerts
• Alarm shelving for maintenance windows

Also create event logs for:

• State changes
• Operator actions
• Setpoint changes
• Comm loss/restoration
• Firmware updates

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7) Trend and historian configuration

For real-time telemetry, you’ll want both live data and long-term history.

Store:

• Raw high-frequency data for a short period
• 1-minute or 5-minute aggregates for long-term reporting
• Alarm/event history separately

Typical reports:

• Daily energy production
• Performance ratio
• Availability
• Downtime by cause
• Irradiance vs expected power
• Sensor health and comms uptime

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8) Add edge logic and control carefully

If you need remote control:

• Start/stop inverters
• Change power limits
• Curtail output
• Operate breakers or relays

Do this only with:

• Authorization and role controls
• Interlocks and safety checks
• Audit logs
• Local fallback logic
• Compliance with utility/grid requirements

For solar plants, control often needs to honor:

• Ramp rates
• Grid codes
• Anti-islanding rules
• Utility dispatch commands

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9) Secure the system

Security is critical for SCADA.

Minimum security controls

• VPN or private APN for remote sites
• Unique credentials per user/device
• Role-based access control
• Disable default passwords
• Network segmentation between OT and IT
• Firewalls with allowlist rules
• Certificate-based auth where possible
• Patch and vulnerability management
• Logging and audit trails
• Backups and disaster recovery

Avoid exposing PLCs/inverters directly to the public internet.

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10) Test before commissioning

Create a FAT/SAT process:

Factory Acceptance Test

• Simulate devices
• Verify every tag
• Check scaling and units
• Validate alarms and reports
• Confirm comms loss handling

Site Acceptance Test

• Validate wiring, grounding, and power
• Test all network paths
• Confirm time sync
• Check latency and packet loss
• Simulate failures and recovery

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11) Practical remote solar site best practice

A robust setup usually looks like this:

• Inverters/sensors → local RTU/data logger
• RTU buffers data and timestamps locally
• Cellular/VPN backhaul to central SCADA
• Central historian + web HMI
• Alarm notifications to ops team
• Remote access only through secure jump host/VPN
• Local fallback logic if backhaul drops

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12) Example implementation stack

One possible stack:

• Field protocol: Modbus RTU/TCP
• Edge gateway: industrial IoT gateway or RTU
• Transport: MQTT over TLS or VPN tunneled Modbus/DNP3
• SCADA/HMI: Ignition, AVEVA, VTScada, Siemens WinCC, iFIX, or similar
• Historian: built-in historian or InfluxDB/SQL-based store
• Dashboards: web HMI, mobile views, Power BI/Grafana
• Alerts: email/SMS/Teams

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13) Common pitfalls to avoid

• Polling too fast and overloading devices
• Mixing units/scaling across vendors
• No buffering at remote sites
• Exposing devices directly to the internet
• Poor time synchronization
• Weak alarm design causing nuisance alerts
• No version control for tag lists and configs
• Not planning for offline operation

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If you want, I can also give you:

1. a reference architecture diagram,
2. a tag list template for solar sites, or
3. a step-by-step setup for a specific SCADA platform like Ignition, AVEVA, or WinCC.