With everything going on, SIP, life etc I have not been using the boat and last week I charged the batteries and both took forever to charge. One of them I don't think ever fully charged. They are parked about 35 minutes away from me in the boat storage yard, it's not covered. I'm thinking of getting (2) 10 amp solar trickle chargers so I can just hook to battery, put on top of boat cover and let them charge. I think I need (2) even though the batteries are in series I don't think just hooking up one will charge both batteries? Amazon has 10 amp ones in the 40 to 50 dollar range with pretty good reviews but just wondering if anybody has already done something like this.