How To Charge A Deep Cycle Battery From The Alternator. Again, this is all standard stuff in rvs. Deep cycle batteries will vary when it comes to charging duration.
A deep cycle battery assassin the alternator pictured here helped to destroy a very expensive bank of tppl agm batteries in under two years. This process happens over a long period of time till the battery energy is almost depleted. By choosing to use the automatic setting you can allow the technology built into the charging unit to determine how much of a charge your battery needs, and then the unit will switch from a 10 amp.
Is there room in the battery rack to put this battery?
The second is to take the battery out of the boat and make use of a portable charging unit to top the battery up to full. It will take some time to charge a battery off an alternator, especially a deep cycle that is dead. One approach is charging the battery in a place where the charging source is fixed, and another approach is using a portable charger. Divide the amp hour rating of your battery by the amp rating of the charger and you’ll have an estimate of the time needed to reach full charge.