Answer
A PV monitoring platform collects inverter, meter and weather-sensor data to track production, calculate performance ratio and turn faults into alarms and tickets. Choose a manufacturer portal for single-brand fleets, a platform-agnostic tool for mixed hardware, and match the sensor class to IEC 61724-1 when a lender or contract requires it.
Last updated: November 2026
SurgePV publishes this post and sells solar design software. SurgePV’s published scope covers design, modeling and proposals, and it is not a monitoring platform. This guide helps you choose one from other vendors.
Solar assets only earn returns while they run. Yet many fleets still rely on scattered manufacturer apps, delayed email alerts and spreadsheets to track performance. A PV monitoring platform pulls production, environmental and fault data into one place, so operators can spot problems early and show performance to owners, lenders and insurers.
This guide explains what a monitoring platform does, how the main platform types differ, what IEC 61724-1 requires in practice, and how to match a setup to a residential, commercial or utility-scale fleet. Vendor features and prices change, so where this guide does not give a number, it says to ask the vendor in writing.
In this guide:
- What changed in IEC 61724-1 in 2021
- What a PV monitoring platform does
- Key KPIs: performance ratio, yield, availability, degradation
- IEC 61724-1 monitoring classes
- Platform types: manufacturer-locked, platform-agnostic, enterprise
- A feature checklist and what drives cost
- The alarm-to-ticket workflow
- How to choose the right platform
Build the expected-yield baseline first
A monitoring platform can only flag underperformance against a number. Model the expected yield and layout before construction so the baseline is documented.
Book a DemoChecking cost first? See the SurgePV pricing page.
What Changed: IEC 61724-1 Edition 2
The main standard behind PV monitoring changed in 2021, and many vendor documents still quote the old classes.
| Item | Detail |
|---|---|
| Standard | IEC 61724-1, Photovoltaic system performance, Part 1: Monitoring |
| Current edition | Edition 2.0, published 21 July 2021 |
| Replaced | The 2017 first edition |
| Monitoring classes | Defines classes of PV performance monitoring systems; Class C was eliminated in this edition |
| Scope | Terminology, equipment and methods for monitoring and analyzing PV system performance |
Source: the IEC webstore listing for IEC 61724-1:2021. The sensor and data-recording requirements for each class sit in the standard itself, so a contract that names a class should be checked against the standard text and not a vendor summary.
Pro Tip
Specify the monitoring platform and sensors during design, not after installation. Choose hardware with open data access or native integrations so you avoid retrofit data loggers, and record sensor placement and the modeled yield before construction. A solar design platform can hold that expected-yield baseline for handover.
What Is a PV Monitoring Platform?
A PV monitoring platform is cloud software that connects to solar hardware and shows what the system is doing. It reads data from inverters, string combiners, revenue meters, weather stations and sometimes module-level electronics. It then calculates performance metrics, raises alarms and stores history for reporting.
It should answer four questions:
- Is the system producing what it should?
- Where are the faults?
- How much energy and money is being lost?
- What maintenance action should happen next?
Core Functions
| Function | What it does |
|---|---|
| Data acquisition | Pulls inverter, meter and sensor data through APIs, Modbus or data loggers |
| Visualization | Shows production curves, maps and device-level dashboards |
| KPI calculation | Computes PR, specific yield, availability and degradation |
| Alarm management | Detects underperformance, offline devices and threshold breaches |
| Ticketing | Converts alarms into maintenance tickets or work orders |
| Reporting | Produces owner, lender and warranty reports |
| Comparison with expected output | Sets actual output against modeled or satellite-derived expectations |
For installers, the platform is also a retention tool. A customer portal with clear charts reduces support calls and makes maintenance contracts easier to sell.
Key KPIs Tracked by PV Monitoring Platforms
Professional monitoring revolves around a small set of standard metrics. Understand them before you compare platforms.
Performance Ratio (PR)
Performance ratio is the most widely used KPI. It is the final yield divided by the reference yield, as defined in IEC 61724 and described in NREL’s Performance Parameters for Grid-Connected PV Systems (2005). In plain terms, it compares the AC energy a system delivered with what an ideal, lossless system would deliver for the same sunlight.
PR = E_AC / (H_POA × P_STC / 1000)Where:
- E_AC = actual AC energy delivered (kWh)
- H_POA = plane-of-array irradiation (kWh/m²)
- P_STC = installed DC power at standard test conditions (kWp)
The IEA PVPS Task 13 report Analysis of Long-Term Performance of PV Systems (2014) uses PR from its performance database, which follows IEC 61724. It found that systems installed between 1983 and 1990 varied around a PR of 0.7, while newer plants installed between 2005 and 2012 showed typical values of 0.8.
- Installed 1983 to 199070%
- Installed 2005 to 201280%
Source: IEA PVPS Task 13, Report T13-05:2014, values read from the report text (about 0.7 and typical 0.8), checked November 2026.
A lower PR than your design model points to soiling, shading, clipping, wiring losses or hardware faults. Compare it with the modeled PR for the same site, not with a generic target.
Other Essential KPIs
| KPI | Definition | How to read it |
|---|---|---|
| Specific yield | kWh produced per kWp installed | Compare with the modeled yield for the same period and weather |
| Availability | Share of time the system is operational | Compare with the contract or O&M guarantee |
| Degradation or performance loss | Annual loss in output | Track the trend over years, not one month |
| Soiling loss | Production lost to dirt and dust | Compare cleaned and uncleaned reference devices where available |
| Performance index | Measured output versus expected output | Use weather-corrected expected output from the model |
| Energy yield | Total energy over a period | Always state the period and meter boundary |
Key Takeaway
PR shows how efficiently the system turns sunlight into electricity, specific yield shows how productive the site is, and availability shows how reliable it is. Read them together. A high PR with low yield may just mean a dull site, while a low PR in normal sunlight signals a technical problem.
IEC 61724-1 Monitoring Classes Explained
The IEC 61724 series is the international standard family for PV system monitoring and performance assessment. Part 1 covers monitoring, and the series also has a capacity evaluation method (Part 2) and an energy evaluation method (Part 3).
For operational monitoring, Part 1 is the relevant part. It defines classes of monitoring systems. A higher class means tighter requirements on sensors, calibration and data recording, and the edition now in force removed the old Class C.
| Decision | What to specify |
|---|---|
| Class named in the contract | The class and the standard edition, for example IEC 61724-1:2021 |
| Irradiance measurement | The sensor type, its plane-of-array position and its calibration record |
| Energy measurement | A meter with a stated accuracy, with the meter boundary defined |
| Temperature measurement | Module and ambient sensors, with locations recorded |
| Data recording | The recording interval and how gaps are handled |
Inverter counters alone can give a PR with poor accuracy. If you plan to sell a project or raise financing, ask the lender or independent engineer which class and edition they require before you buy sensors.
Types of PV Monitoring Platforms
Not every platform fits every project. The market splits into four broad categories. The examples are named for orientation and are not ratings. Check each vendor’s own site for the hardware it supports, the features it offers and its price.
| Category | Typical fit | Examples to look at |
|---|---|---|
| Manufacturer-locked | Fleets built on one inverter brand | Portals from inverter makers such as SolarEdge, Enphase, SMA and Fronius |
| Platform-agnostic commercial | Mixed hardware across many sites, with O&M and reporting | Independent vendors such as Amperecloud, Solytic, Solar-Log and meteocontrol |
| Utility-scale enterprise | Large portfolios with SCADA integration and lender reporting | Vendors such as AlsoEnergy, Power Factors, Inaccess and Prediktor |
| Open-source or DIY | Technical homeowners on dynamic tariffs | Home Assistant with community integrations |
Manufacturer portals usually come with the hardware and work well when the whole fleet uses one brand. Platform-agnostic tools earn their place when installers and asset managers run several brands. Enterprise platforms add control-room features, and DIY options give flexibility at the cost of setup and upkeep. For a deeper look at system types, see solar monitoring systems compared.
Decision Framework
Single-brand residential installer: start with the manufacturer portal. Multi-brand commercial fleet: use a platform-agnostic tool. Utility-scale plant: choose an enterprise platform with SCADA and bankable reporting. DIY homeowner: Home Assistant if you have the technical skills.
PV Monitoring Platform Feature Checklist
Use this checklist when you evaluate platforms.
| Feature | Why it matters |
|---|---|
| Multi-brand inverter support | Avoids juggling separate apps for mixed fleets |
| Real-time and historical data | Needed for troubleshooting and trend analysis |
| Device-level diagnostics | Pinpoints faults to an inverter, string or MPPT |
| Weather and irradiance integration | Enables PR calculation and weather-corrected comparison |
| KPI reports (PR, yield, availability) | Standard reporting for owners and lenders |
| Financial calculations | Tracks revenue, savings and the value of lost production |
| Alarms and notifications | Email, SMS or push alerts for faults |
| Maintenance ticketing | Converts alarms into trackable work orders |
| Mobile app | Field technicians need access on site |
| API and integrations | Connects to CRM, CMMS, billing and SCADA |
| Document management | Stores as-builts, warranties and O&M contracts |
| User roles and permissions | Controls access across large teams and customers |
The best platforms do more than collect data. They close the loop from detection to resolution.
What Drives PV Monitoring Cost
This guide does not quote platform prices, because vendors publish or quote them separately and they change. Ask each vendor for the figures below in writing.
| Cost driver | What to ask |
|---|---|
| Software fee | Priced per site, per kWp, per device or per user, and the billing period |
| Bundled portal | Whether the inverter maker’s portal is free, and for how long |
| Hardware | Data logger, gateway, revenue-grade meter, irradiance and temperature sensors |
| Connectivity | Cellular or network service for each site |
| Data and API access | Retention period, export formats and any API fees |
| Support and onboarding | Setup, training and response times |
The upfront cost of sensors and meters can be small next to the value of catching underperformance early, so check it with your own numbers. A financial model lets you estimate what a point of availability or PR is worth for a specific site.
Alarm-to-Ticket O&M Workflow
The value of a monitoring platform shows when something goes wrong. Modern platforms automate the path from fault detection to field resolution.
The Six-Step Workflow
- Fault detection. The platform reads device data and flags anomalies such as zero production, low PR or communication loss.
- Incident creation. A transient event is logged but not yet escalated.
- Alarm escalation. If the incident persists beyond a configured delay, it becomes an alarm.
- Ticket creation. The alarm opens a ticket with the fault type, error code, affected asset, severity and recommended action.
- Work order assignment. The ticket goes to a technician based on location, skill or workload.
- Resolution and close. The technician fixes the fault and documents the work, and the ticket closes when data confirms the fix.
Benefits of Automation
| Benefit | How it helps |
|---|---|
| Response time | Faults reach the right technician without manual triage |
| Truck rolls | Remote diagnostics can avoid some site visits |
| SLA compliance | Automatic timestamps document response and repair times |
| Warranty claims | A maintenance history supports the claim |
| Customer retention | Proactive fixes reduce owner complaints |
Compare vendors on how well alarm thresholds can be tuned. Nuisance alarms that cannot be adjusted push technicians to ignore the system.
Document the design the monitoring will check
Keep the layout, equipment list and modeled energy for each site in one place, so a performance gap has something to be measured against.
Book a DemoChecking cost first? See the SurgePV pricing page.
How to Choose the Right PV Monitoring Platform
Selection depends on fleet size, hardware mix, reporting needs and budget.
Decision Checklist
| Question | If yes | Type to consider |
|---|---|---|
| All systems use one inverter brand? | Use the maker’s portal | Manufacturer-locked |
| Mixed hardware across many sites? | Use one dashboard for all | Platform-agnostic |
| Need lender-grade reports? | Specify the IEC 61724-1 class | Platform-agnostic or enterprise, with matching sensors |
| Heavy O&M workload? | Look for alarm-to-ticket automation | Platform-agnostic or enterprise |
| Utility-scale or SCADA integration? | Use a control-room platform | Enterprise |
| Budget-sensitive residential? | Use the free inverter app | Manufacturer-locked |
Red Flags to Avoid
- Platforms that lock you out of your own data
- No API or export options
- Nuisance alarms that cannot be tuned
- No mobile app for technicians
- Hidden per-site or per-inverter fees
Implementation Tips
- Define KPIs and reporting requirements in the EPC contract.
- Install revenue-grade meters and irradiance sensors during construction.
- Set alarm thresholds from site conditions, not defaults.
- Train technicians on the mobile app before go-live.
- Review monthly PR trends to catch gradual degradation.
Further Reading
For ROI metrics once a platform is live, see commercial solar monitoring ROI metrics. For the definition behind the main KPI, see performance ratio.
Before you commission a site, book a SurgePV demo to see how the design and expected-yield model can be handed over to the owner and O&M team.
Frequently Asked Questions
What is a PV monitoring platform?
A PV monitoring platform is software that collects data from solar inverters, meters, weather stations and sensors to track production, detect faults and report performance. Installers, asset managers and owners use it to manage fleets, cut downtime and show that a system performs as designed.
What are the main KPIs tracked by a PV monitoring platform?
The core KPIs are performance ratio (PR), specific yield in kWh per kWp, availability, degradation or performance loss, soiling loss and a weather-corrected performance index. IEC 61724-1 sets the monitoring requirements behind them, and PR is the ratio of final yield to reference yield.
How much does a PV monitoring platform cost?
The cost depends on whether the portal comes with the inverter, whether you need extra meters and irradiance sensors, and how many sites you manage. Vendors publish prices or quote them, so ask in writing for per-site or per-kWp pricing, hardware, data retention and API fees.
What is the difference between manufacturer-locked and platform-agnostic monitoring?
Manufacturer-locked monitoring works with one maker’s hardware, such as the portals offered by inverter manufacturers. Platform-agnostic monitoring connects mixed hardware brands into one dashboard, which suits installers and asset managers who run multi-brand fleets.
What is IEC 61724 and why does it matter for monitoring?
IEC 61724 is the international standard series for PV system performance monitoring and analysis. Part 1, edition 2.0 from July 2021, defines classes of monitoring systems and removed the earlier Class C. Contracts and lenders often name the class, so the sensors and data recording must match it.
How does an alarm-to-ticket workflow work in PV monitoring?
The platform flags a fault from device data, escalates it to an alarm if it persists, then opens a maintenance ticket for a technician. A good ticket names the fault, the affected asset and the severity, and it closes when data shows the fault has cleared.
What hardware is needed for a PV monitoring platform?
At minimum you need production data from the inverter. For performance reporting, add a revenue-grade meter, a plane-of-array irradiance sensor and module and ambient temperature sensors. A data logger, gateway or cellular modem connects the hardware to the cloud platform.
Where this fits
This article is part of SurgePV's Solar Technology hub, which works through the topic from first principles to the decisions a project team actually has to make.
