In today’s world, data is everywhere. Improved data logging capabilities alongside widespread options to store, access and analyse data help diagnose systems in many industries.

Why log solar thermal data?

Data logging solar thermal systems can be a great way to:

  • evaluate if a solar system is running efficiently
  • determine if and when the solar system is overheating
  • maximise the overall system efficiency. This enables you or an engineer to optimise the boiler controls for after heating.

How can I log solar thermal data?

Resol DL2 data logger
Resol DL2 solar water heating data logger

Resol are the market leaders in solar thermal controllers. The DL2 offered by Resol logs solar thermal data. This add-on unit can be connected to any of Resol’s controllers to log key system data such as

  • panel temperatures
  • cylinder temperatures
  • pump speeds
  • faults

Analysing this data can help in increasing your solar system’s efficiency as well as diagnosing any faults or anomalies.

Current controllers with built in data logging

Resol DeltaSol SL Solar Controller
Resol SL solar controller with built in data logging facilities

As an alternative to the DL2 data logger add-on, we can install a modern. Resol Controller that has integrated data logging facilities such as Resol SL, Resol SLL, Resol SLT or Resol BS Plus.

Please also check our controllers page if you are looking for other controller models.

Analysis of the solar thermal data

Once we have the data of your solar thermal system, we prepare the data ready to visualise it with a data package. We then host the data on one of our own servers and give you password protected access. Below you can see some of graphs that we can produce. Please The data package allows you to zoom in on individual data points and points in time. This is particularly helpful to get a deeper understanding of your system. As a result we can offer advise on changing settings of your solar controller or your boiler settings.

Hours run of a solar system during April
Hours run of a solar system during April
A solar heat exchanger data log
Sensor temperatures showing problems with heat transfer as the temperatur distances are too large.
Graph of a solar sytem with two sets of panels and an heat exchanger
Sensor temperatures showing good heat transfer
Solar Thermal system with 3 sensors
Panel temperatures during a sunny day, showing good heat transfer to the cylinder
Cylinder temperatures of a Solar Thermal system with 3 sensors
Cylinder temperatures rising during the day, water extracted in the afternoon and reheating to temperature.