JimK
The cost benefit of buying a larger charger depends on the amount of time you spend at anchor. If it is just a few days a year buy a small, perhaps 40 amp charger and run the generator for a few hours.
If you spend substantial time at anchor consider a combination charger inverter which will provide a 100 or 125 amp charger. This plus you current 20 amp charger will top up the batteries quickly.
Stand alone chargers greater than 40 or 60 amps become expensive.
__________________
Marty
|