An easy way to keep your batteries fully charged is to utilize a portable solar charger like our Solar Fishing Pole. It is a complete solar charging system that utilizes the power from a 30W solar PV panel that will drop into any fishing rod holder and plugs directly into the auxiliary cigarette lighter. https://www.emarineinc.com/Solar-Fishing-Pole-30W-12VDC-Battery-Charger
Post time: Jan-05-2017