yes correct !!!! but if you have a mind for the dynamics of the operation you will see that which ever puts out the highest voltage will be charging the battery at a rate decided by the charger and the battery characteristics the others are only sitting there not contributing any thing untill the working one is switched off or the output falls below one or the others rate in which case some thing other takes over and its always the highest voltage .
Do you see what i mean or can i explain it in another way ???? they wont add untill they are all exactly the same