GRUPOTEC keeps an eye on solar energy production with Paessler PRTG

The long journey to PRTG

To meet the challenges mentioned above, a higher-level IT monitoring system was needed to properly monitor and consolidate the IT environments of the different plants. Initially, the company developed its own solution based on the open-source solution Nagios. However, this proved to be unsuitable because it was too complex, costly, and limited in its options. Soon, the costs for implementation and maintenance exceeded the license costs that a more easily deployable, commercial monitoring solution would have cost.

In 2017, GRUPOTEC therefore turned to Nunsys, a Spanish IT services company that has been providing GRUPOTEC with reliable support and advice for many years. Nunsys has been working with Paessler, maker of monitoring software, for more than 12 years. Because of its trust in Nunsys, Grupotec spared itself a long and complex evaluation by following the recommendation of Nunsys’s experts – they implemented Paessler PRTG Network Monitor as their new IT monitoring solution.

Oscar Cervera, IT Manager at GRUPOTEC, recalls: “When we get advice from the expert, we follow it. So once again, our trust in Nunsys saved us a lot of time and effort. PRTG proved to be the right solution for our task from the very beginning. The migration from Nagios to PRTG was quick and smooth, and we soon discovered that we could do high-level SCADA development much more easily with PRTG than with Nagios.”

IT monitoring to secure communication

Within a few days, all solar parks were integrated into the central monitoring with PRTG, and GRUPOTEC began to expand the monitoring beyond checking communication availability.

To ensure reliable communication within the solar parks, there is a redundant fiber optic infrastructure in all of them and a firewall that controls both internal and external communication. In addition, all plants are connected to the headquarters via VPN.

Depending on the size, from 2 to 20 switches per plant and several firewalls are used. These devices are mainly integrated into the general supervision via SNMP, which monitors the bandwidth of the network devices as well as various hardware parameters.

“At the beginning of the 30-day free trial period, we had already done much of the migration from Nagios to PRTG and implemented many new and useful features. After purchasing the license, we then only had to enter the license key and could continue working without interruption. In my opinion, this is how a migration should work: Without any risk and with minimal effort,” explained Oscar Cervera, IT Manager at Grupotec.

SLAs, processes, and maps

Once the most important systems and components from both IT and production had been integrated into the overall monitoring system, the monitoring had to be optimized to ensure that interrelationships were immediately recognizable and that, in the event of disruptions, the cause could be quickly localized, evaluated and, if necessary, remedied. To achieve this, GRUPOTEC relies primarily on two features in PRTG: the Business Process sensor and the Maps.

The Business Process sensor allows the results of several sensors (measuring points in PRTG) to be combined in one sensor and weighted using individual formulas. For example, PRTG can localize faults in the fiber optic network by correlating data from the connected switches and marking the affected lines in the event of a fault.

The Business Process sensor can aggregate multiple switch line systems to alert of faults when there are redundant lines. Everything together, switches, lines and the superordinate processes, can be represented in individual dashboards, which are called maps in PRTG. This enables a quick visual check and, in the event of a fault, the source of the fault can be easily localized.

Oscar Cervera explains what this means for Grupotec: “As the operator of the solar parks, we are subject to strict SLAs that demand 99% availability of the communications. Outages must therefore be rectified immediately, otherwise we face penalties. Thanks to the Business Process sensor in PRTG, in the event of an outage we can now see at one glance whether we need to intervene immediately or whether the problem can wait until the next routine maintenance, since the backup is still available. With solar farms spread across Kenya, Spain and England, this is a key advantage.”

Monitoring the industrial components

Efficient root cause analysis in the event of faults is only possible if the entire plant is monitored, i.e. both the industrial components and the IT network and infrastructure. However, the SCADA systems used in the solar plants focus more on the industrial side and the collection of production data via data loggers, and thus do not provide much information on the network components.

With PRTG, GRUPOTEC also monitors these controllers and, thanks to Modbus compatibility, extracts all the information needed.

The TCP/IP and Modbus TCP sensors are used for this purpose. In this way, the team at GRUPOTEC headquarters has an overall view of the power generation of solar parks, as well as other parameters, regardless of which SCADA system is in use.