Photovoltaic converter for water heating. Off grid direct electricity from Volt Polska panels

Hello.
I decided to try and test the volt Polska converter for heating water directly from solar panels.
This is a very good way to obtain hot water (for free), of course I am not talking about purchasing the necessary components. The cheapest way costs about PLN 3,000.
If we invest, there will be enough hot water on sunny days.
The controller takes care of our panels so that they do not operate on a short circuit.
When the sun is weak, it disconnects the system. If the panels are connected tightly to the heater in weak sunlight, the voltage drops to low values ​​and a short circuit occurs.

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