Field test: PV Modules

A real world comparison between Mono, Poly, PERC and Dual PV Modules.

Total solar yield: --
Total solar yield: --
Total solar yield: --
Total solar yield: --
Total solar yield: --
Total solar yield: --
Installation date: 09-03-2020

* This is a field test and the results are specific for this installation on this location please research which is the best solution for your own situation as the results can be different based on environmental influences.

Total solar yield as of 27/03/2023 when the results were reset:
Mono: 9158 kWh
Split-cell: 9511 kWh
Poly: 9113 kWh
Perc: 9471 kWh
Perc-east: 1970 kWh
Perc-west: 1730 kWh

BlueSky Energy: Energy Storage systems & compatibility

In recent blogs you will have noticed an ever increasing range of battery makes and technologies that are catered for and which integrate well with Victron Energy products. Examples of such products are Victron Quattros, Multis and MPPT solar charge controllers.

An interesting compatible battery technology is Aquion Energy’s Aqueous Hybrid Ion (AHI™) chemistry:

Aquion – safe and sustainable saltwater batteries

The Aquion AHI batteries are 48V, and according to the manufacturer the safest batteries in the world; non-flammable, non-explosive, non-hazardous, and touch-safe. There are no heavy metals or toxic chemicals involved, making them very suitable for Energy Storage.

Details of Victron Energy & Aquion AHI products and their compatibility are listed here:

Why add energy storage to a grid connected solar system?

Countries around the world have many differing reasons and incentives to add Energy Storage Systems. This might be due to an unreliable grid, the opportunity to feed back to the grid with some countries being worthwhile financially to do so and others not. It can, therefore, make sense to utilise as much solar power as possible locally and not feedback or indeed draw from the grid, due to solar becoming more cost effective and more stable than grid energy.

Consequently, if there is an excess of solar power it can effectively be wasted if not stored and used locally, rather than being fed back to the grid. This, of course, is where an Energy Storage System comes in.

Two Energy Storage integration examples

In considering the above we recently heard from BlueSky Energy, an Austrian company that have carried out various installations, integrating Aquion batteries with Victron Energy products. Here are two such examples.

Apartment building in Frauental

This 8 apartment building is in Frauental in the Austrian region of Styria and it is shown in the headline image of this blog, where you can see that the PV system is placed on the roof, the facade, and even the balconies of the building.

This project is a showpiece in terms of self-consumption and increased self-sufficiency. The installed 30kWp photovoltaic system generates enough energy to heat and produce hot water for all of the 8 apartments, as well as enough to charge the Aquion batteries to ensure that all consumers are supplied by the battery stored solar power during the night hours.

The project was implemented by BlueSky Energy and their partner Langmann Consulting.


The energy storage system comprises:


Family home

The installation shown below is a family home energy storage system in Groß St. Florian in the Steiermark region of Austria. Initially, this was a grid connected solar system but recently energy storage was added. The reasons for doing so become apparent when we look at the graphs below, taken from Victron’s VRM portal.

Solar yield

The graph in the example below is taken from this home system, showing solar energy production or yield and where that goes over a 24hr period, in 2 hour time slots.  You’ll note that around a combined 92% of the yield is used directly by the home (yellow bars) and stored in the batteries (blue bars) for night-time use or times of low solar yield. Energy usage or home self-consumption and energy storage are therefore maximised, with only around 8% being fed back to the grid for the reasons discussed previously – such as poor grid feed-in rates or tariffs for example.


Energy consumption

In this graph below we can clearly see the benefits of adding an energy storage system. All the blue in the bars show that the house has been powered from the batteries. The self-sufficiency level of the house has increased to 70%, whereas without an energy storage system it would only be around 35%: the hours where PV production overlaps with demand.



All in all the above graphs demonstrate very good reasons for installing this home energy storage system, the components of which are shown below.


The energy storage system comprises:


It’s good to see more and more Victron Energy products being used with differing battery energy storage technologies, along with confirmed product compatibility on both sides.

Our thanks to Wolfgang Burgstaller of BlueSky Energy for the information and images used in this blog. To learn more about BlueSky and what they can do for you contact:


BlueSky Energy
Fornacher Straße 12
4870 Vöcklamarkt

Tel: +43 (0) 720 0101 88


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