The regulator, is effectively the brain that controls the power your alternator puts out.
All Balmar alternators use an external regulator to function. The 6 series do also have an internal regulator built in, but this is only really for emergency use, or very simple needs.
There are 6 Balmar models available. The MaxCharge MC-612, MC-614, MC-624 and the ARS-5, these are what are considered ‘smart’ regulators. The BRS-2T is a single stage, adjustable voltage regulator for use where a smart regulator is overkill and finally, the ERS which is a simple, fixed voltage (14.1V) backup regulator for ‘get you home’ situations.