A DC-DC charger (also called a Battery-to-Battery or B2B charger) sits between your starter battery and leisure battery. Its job is to take power from the alternator and convert it into the correct, safe charge for your leisure battery.
How Does a DC-DC Charger Work?
- Detection: The charger monitors the starter battery voltage and detects when the engine is running. It only activates at this point, ensuring it never drains your starter battery while you're parked.
- Voltage Transformation: Alternator output isn’t constant, it fluctuates. A DC-DC charger stabilizes this and adjusts it to the exact voltage required for your specific battery type.
- Multi-Stage Charging: It delivers power in controlled stages rather than all at once:
- Bulk: Sends maximum current to charge the battery quickly (up to ~80%)
- Absorption: Reduces current while holding voltage to bring the battery to 100%
- Float: Maintains the battery at full charge without overcharging
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