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Polysun 7.0: Updated component catalogues and template databases. New features including cogenerators, generators for off-grid PV systems and ice storage tanks.

Besides new templates (compact systems, multivalent systems), the update also includes new catalogue additions for solar collectors, PV modules and inverters.

Polysun Press Release 7.0 ImageWinterthur, May 26th, 2013 – The following features were added to Polysun or extensively enhanced:

  • Inverter technology for power-controlled heat pumps
  • Cogenerators and combined heat and power
  • Off-grid PV systems with generator
  • Micro-inverters
  • Ice storage tanks

Component catalogue and template database updates give designers a useful helping hand

While it may not sound spectacular, the most significant improvement included in the new Polysun 7.0 update is by no means less important and useful to designers: software provider Vela Solaris has, in fact, extensively overhauled component catalogues, template databases and standard templates of its innovative simulation software, laying the foundations for a more efficient design of solar and geothermal systems.


The current trend of combining PV and heat pumps systems is posing new challenges to system designers; for this reason, starting from version 7.0, the software was extended with additional ready-made templates, including, in particular, new templates from solar inverter producer SMA ( and from young ETH spin-off company Eturnity (


New templates for multivalent systems were also added, making system design and comparison significantly easier (example: heat pump + gas heating or pellets + solar thermal).


In light of the enthusiastic reception it received from users, the programmable controller, introduced in a previous version of Polysun, was enhanced with a number of new templates and new features such as the heating curve for space heating.


In addition, new templates for compact solar thermal systems were added in cooperation  with Austrian company Siko Solar ( which were also presented during the 24th Otti Symposium für Solarthermie held in Bad Staffelstein, Germany.


The software was enhanced with the following new features

Widely used globally, power-controlled heat pumps (inverter technology) can now be displayed through stepless modulating air-water heat pumps in the new 7.0 version of Polysun. This makes it possible to adjust heat generation to the power made available through the PV field. As a result, the heat pump can be operated with a higher percentage of solar power while optimising PV self-consumption.

Micro-inverters: Now, the Polysun design wizard specifically allows systems to be designed with micro-inverters based on the simple «Plug & Play» principle, as offered by micro-inverter manufacturers. This makes inverter dimensioning considerably simpler whilst increasing planning security.

Simulation of cogenerators and combined heat and power (CHP):Standard templates include both electrically-driven and heat-driven systems. Now, component catalogues have been extensively expanded. This, together with the programmable controller, allows the detailed simulation of smart-grid solutions with decentralized power generation both through PV and combined heat and power (CHP).

Generator for off-grid PV systems: Starting from version 7.0, Polysun provides the user with a generator for purely electric and combined heating and power systems (see figure 1), allowing an accurate, true-to-life simulation of off-grid systems. In addition, temporary independence from the grid, as happens in shaky distribution networks, can also be simulated.


 Off-grid PV system with generator

Figure 1: Off-grid PV system with generator. The flexible system configuration with Polysun Designer makes it possible to either add a generator or (not shown in the figure) to expand the system with a grid connection, if necessary. Then, the programmable controller enables the user to review different smart-grid strategies and compare them with one another by means of a physics-based simulation.


Polysun in use worldwide

As a latest innovation, Polysun is now also available in Arabic. This involved translating the whole user interface into this language, a task that, since Arabic is written from right to left, took some extra time and work.


 Polysun in Arabic

Figure 2: Polysun in Arabic. In the Arabic-speaking world texts are written from right to left. Wizards and PDF reports too were accordingly adapted to this way of writing. This brings us a step closer to achieving the goal of global solar energy optimization and efficiency enhancement through simulation.


Overview of new features in Polysun Version 7.0

Download full press release (PDF)