Being out of the country for 7 months does not exempt you from the penalty for not having health insurance that meets the requirements of the Affordable Care Act. You will have to pay the penalty for the full year.
(There is an exemption for someone who was physically present in a foreign country for at least 330 days in a 12-month period. From what you have said, you do not appear to qualify for that exemption. Seven months is less than 330 days.)
