The longer answer, if the charger is a simple transformer and rectifier then a mains spike (voltage increase) will be passed through. If it is a regulated charger then the regulator should take care of it.
The size of the battery bank and charger will slightly influence the surge absorbing ability. Think of it this way, fill a bath with water, put your hand in and make waves. Now go out into a big lake/ocean and make waves.
regards AllanA life lived in fear is a life half lived.