Solar charger for 4 6v golf cart batteries LONG TERM?

Solar is awful dependent on where you live and the weather..I have 400 watts on the roof and 200ah of lithium batteries and it won't keep up right now in this weather..5-6 days maybe then it's generator time...Roughly 5-600 watt hours going out daily..The 2k inverter uses 13 watts times four is 300 watts plus daily of I left it on 24/7..

I need my generators even with 4-600 watts of solar where I live in the winter..The summer is just the opposite with all the sun..