Question: We have a three phase power supply (3x25A) at our home in The Netherlands (230V). All three phases are used for an induction cooker, and in parallel, two phases (let's call them 1 and 2) each power about half of the household.

We recently had solar panels installed (about 2.5kWp), and the inverter is tied to the third phase (i.e., not 1 or 2, so it is only directly connected to the induction range). Is this the right way to do it? On the one hand, it seems inefficient to draw most power from phase 1 and 2, and supply power to phase 3. On the other hand, the electrical noise from the inverter is all dumped into phase 3 so perhaps it actually isolates the electrical noise from the rest of the household.

Is there a 'right' way to choose which phase the solar panels are connected to? Or does this squarely fall in the **it really doesn't matter** category?

Answer: 
Being a grid-tied installation, it's quite possible that the power utility had some say in which phase to connect the PV system to. In 3 phase systems, it's necessary to balance the load as equally as possible between the 3 phases but this is difficult to impossible to do within a single household. So the utility designs the distribution network so that a group of homes share the load across the phases and over a large number, the phases are well balanced.

When connecting PV equipment to their system, generally the utility will provide specific instructions on interconnect based on the capacity and type of your system. You may not have been aware of this as the installer was likely the one receiving the instruction, not you.

You might check with the installer as to the reasons why they hooked it up as they did.
You need to evaluate which phase has the highest average load during the daylight hours and put the system on that. If all your loads were 3 phase (I know they are not) having a single phase solar feed would create imbalances in the system.