I the real world a panels advertised gross wattage will seldom be achieved - for overall averaging purposes I subtract 25% or even more depending on weather conditions (less in the Nevada desert)...Everyone’s experience can vary, so based on my 10yrs with 440w of solar and two 6v GC’s, I would suggest to OP having for more solar and an MPPT type controller to help exploit peak harvest hours while avoiding white knuckle stresses...I agree that Li will greatly reduce recovery times and solar wattage requirements...Li will be my next power supply...
