Yes, Powerpal works great with solar!
The app shows the power you are importing from the grid and will show 0W of imported power when your solar array is fully powering your home. This is a great time to run any occasional appliances (like the washing machine or dishwasher) to soak up any spare solar energy, rather than exporting it to the grid, to maximise your solar benefits. It's free to run your appliances at these times, so why not!
You can track the times when your home has spare solar energy available using the energy clock on the Powerpal dashboard - look for a "flat spot" in the middle of the day which shows the times when no energy was required from the grid to power your home.
Most solar inverters will report gross solar generation but do not provide consumption information. Powerpal completes the picture by showing the times when you are importing from the grid (or not) so you can match your appliance usage to when you have spare solar power available.
Please note that Powerpal does not report on solar energy exported to the grid as this is not available via the optical interface on the meter.
If real-time monitoring of your exported solar energy is a key requirement for your household then an alternative (electrician installed) product may be a better fit for your requirements - some good ones on the market are Solar Analytics, Carbon Track, Enphase or the Fronius Smart meter.