Why do you want to keep 12v connected in storage? Just curious
I have and use a battery disconnect switch on my trailer when in storage.
Due to health issues, I was unable to perform any maintenance on my trailer for seven months, last year. In that time, the batteries had run down significantly. That is why I felt compelled to take some action. The easiest thing for me to do was the small solar panel. I will see soon enough if it was a good decision or not.
I am encouraged that you get great life out of the battery by charging before storing and disconnecting cable. Thanks for your advice.
