ACOPOWER does a wonderful job charging my RV battery. It fully charges my battery in about 5 hours on a transparent, sunny day and 6-7 hours on a foggy day. a far better and cheaper alternative to ceiling mounting. you'll turn this panel towards the sun
if you wish to gather more rays. the duvet is of excellent quality, but beware, it'll not protect you from a fall. I kept the shipping box that came once I packed it in my RV. Good product.