I have a boost converter in a smaller panel with smaller voltages and it works. I pumps even with very low voltage in the panel.
But in this case, what would happen if the panel is providing the power because it's voltage is above the battery voltage, but the current is not enough to activate the mower?
So, the mower would need current from both the panel and battery. Will the panel voltage go down until the battery diode gets forward biased and start to supply current? Even with the boost converter in the panel?
Without the boost converter, could be that most of the time the voltage of the panel is below the battery voltage and it's blocked by the diode. Depending on the most common voltage of the panel with normal light and with the load, not the open circuit voltage.
Maybe there could be some rippling, when the diode gets activated the load will drag the voltage down, deactivate it, and so on.
I'm not sure.