be a lot cheaper to run a generator than to use solar for grow lighting.
a 100w light for 24hrs will need 400w of panels charging batts for 6hrs per day just to run it for the one day with no reserve for if its a cloudy day and youll need 3-4 times the capacity in the batts so you dont discharge the batts too much.
with solar panels costing around $5+ per watt itd be cheaper to just buy buds for the rest of your life instead.