Since we are rarely in contact with an end customer directly, the solar system and its installation had been sold to the customer by one of our partners. This partner had also ordered the installation. For the customer, this meant a completely assembled solar system readily deliverd..
“I am very satisfied with the performance of the equipment and I was especially impressed with your fast and competent service.”
This is what the owner in Bergen op Zoom now says, after the plant has now been in operation 2 for almost 2 weeks. Because everything runs smoothly and we have had contact several times, to make individual optimizations. But go through it step by step.
The course of events.
On 02.02.2017 the installation of the hybrid (PVT) solar system took place. The PVT sun collectors had already been installed on the roof the previous day. And the power line of the PVT sun collectors was already connected to the wall mounted inverter. copper tubes for the solar fluid led – as discussed – into the attic of the house. The necessary equipment should be installed there. Then the two heat pump solar boilers were built in by a local installer. A solar boiler with 3,5 kW for the hot water and the stronger solar boiler with 7,3 kW for the heating.
Now there are now two very powerful heat pump solar boilers, which, according to the residents, provide an extraordinary heating performance and, in addition to the well-running heating, also heats the hot water to all expectations. One more satisfied customer. That is how we like it.
Everything fine after the installation?
At first glance everything looked normal. As we were in the attic, where the heat pump solar boilers were installed, no problems were to be expected. The installer seemd to have everything under control. We had clarified some important questions with him, before the installation took place. Then, In the evening, the shocking news: Water is running from one of the boilers. It turned out, that one pipe had not been connected correctly. Even though we were not the seller or installer, we immediately fixed it ourselves the next day .
Some days later the next news: there was no adequate heating according to owner. This seemed very surprising, because we know from our own experience and previous installations, that the heat pump solar boiler heats water in the tanks in record time . We had to take a personal look.
Problem solving on site.
We drove to the house and found, that some of the older radiators were not properly installed and connected. Not a mistake in our heat pump solar boilers or the installation, but we solved the problem, to demonstrate the performance of the POWER KOMBI MODULE solar system to our customers.
It then turned out, that the inverter was dimensioned incorrectly , so that the PVT solar collectors could not deliver their electrical power. It was designed for an output of 2.200 kW, but the system produces up to 3.000 kW, i. e. due to the cooling of the photovoltaic cells. Again, not a problem of our products, it was just a wrong dimensioned product. We explained that to the electrician, who then solved the problem by replacing the inverter finally.
On that occasion we also correctly connected the condensation drainage. The heat pump solar boilers produce a small amount of condensation water, the quantity of which depends on,. e. g., whether the supply- and removal of air is optimal.
We also built in a recuperator, to maximize the performance of the heat pump solar boiler.
What is a recuperator?
This is a device, which heats the cool back-flowing heating fluid by means of the hot heating fluid flowing towards the heating elements. As a result, the backflowing heating fluid is no longer so very cold and must therefore be heated, to reach the temperature for the heating inflow. That relieves the heat pump solar boiler resp. makes its performance even more efficient. Such a recuperator is virtually the turbo of heat pumps. In addition, recuperators save energy.
Lo and behold: With the new heat exchanger the whole system ran even more efficiently. We then finally optimised the setting of the heat pump solar boiler. Instead of setting the target temperature to 60 ° C, the owner wanted to set the temperature to 50 ° C. As a result, the heat pump solar boiler consumes less energy and the temperature is sufficient for hot showering and heating.
From our experience of this and other installations we have derived some points for a particularly efficient use of our hybrid (PVT) solar system.
General points for an installation:
- Air vents in central locations:
At the highest point of the solar fluid; at the pump, at the highest point of the heating tubes
- Air in- must be installed in the correct size, to ensure optimum performance.
- In the heating circuit only one pump should be installed, so that several pumps do not interfere with one another,.
- A recuperator improves performance and simultaneously saves energy
- A good briefing of the installers before installation is very important. We are happy to help with advice and particularly with intensive training.
The satisfaction of the users of our hybrid (PVT) solar systems is our ultimate goal. Our customer in Bergen op Zoom has also noticed this:
“You as POWER KOMBI MODULES were not directly involved in the sale. Nevertheless, you took care of everything, you were always available for me. And through your extensive knowledge, small problems could be remedied quickly and efficiently, which others could not solve. Impressive”
This is precisely our aim. Satisfied customers. We would be happy to assist you with advice and action: before the sale and afterwards. Let us advise you free of charge and without obligation.