It is a trickle charger that I think you just plug in and leave charging the battery continuously at 0.2amps.
Chris
I leave another boat with a battery charger connected to shore power all the time, the only issue is the battery will dry out and lose water , you need to keep watching the levels (don't overfill ,if you do 6 cells become one and the thing stops working altogether) once a month is enough.
