IZZY...welcome. It sounds like you are just looking to recharge your batteries during the week rather than have a charging system for daily cruising use. Correct?
Flexible panels are OK for such use but it is the wattage output of any panel that will matter. I suggest no smaller tha 20 watts for keeping batteries recharged during the week. To be of better help we need to know more about your use of the boat and the SIZE of the battery bank.
No longer posting. Reach me by PM!