Battery management in car and caravan has changed substantially within the last few years, battery types vary from lead acid, lithium, glass matt, calcium and the list goes on. Correct fitting is imperative when charging auxiliary battery systems both in car and caravan, there are so many variables.
Vehicle charging in more modern vehicles also varies, Temperature Compensated Alternator (TCA) to a Variable Voltage Alternator (VVA), the older style Alternator Systems charge at a constant voltage (CVC).
Correct battery management must be observed when charging auxiliary batteries given these conditions.
Equipment such as DC to DC Chargers, Solar input, 240 Volt Battery charging will insure the auxiliary battery will reach optimum state of charge.
CCC, has the knowledge when calculating what is required.