As promised...I am reporting the status of my 450 amp battery bank being left for 7 months with an inexpensive VW shipping
solar panel I bought off E-Bay for $20. It is rated at 4 watts.
Upon arriving on 'Faiaoahe', I hooked up my A.C. and threw the charger
on. It only climbed to just over 15 amps and only for 20 minutes before it settled down to zero.
Apparently the little charger
did it's job keeping them topped off.
Please note...I cut off the little regulator
and attached a couple of aligator clips and hooked directly to the battery.