The Sterling Power BBW1212 Battery-to-Battery charger is a unique product that was designed to resolve a problem that is common on boats with separate windlass, bow thruster, and trolling motor batteries, or any separate battery bank that is remote or of a different voltage from the main charging system. RVs can also benefit from these chargers. This model is rated at 30 amps input for 30 minutes, and automatically limits to 20 amps input after that. The Sterling ProCharge-B IP68-rated models are completely waterproof (IEC rating 6 for dustproof, 8 for immersion up to 1 meter) and very moderately priced. They are an excellent choice for charging trolling motor batteries while under way, or charging any trailer-mounted battery bank from the towing vehicle's charging system. Electric wheelchairs, too. These waterproof models are rated at 30 amps for 30 minutes, and 20 amps continuous (at 12 volts). The Sterling Battery to Battery Charger is a quality multi-stage charger that uses the energy coming into a battery from an alternator as a power source, and uses it to charge another battery bank. This has a number of advantages: Each battery bank receives the correct charge current, depending on it's state of charge. The voltage drop induced by a long cable run to a remote or bow-mounted battery is corrected for (these batteries tend to not be fully charged otherwise). Alternator output is maximized, minimizing engine run time for battery charging. Remote batteries are properly maintained and de-sulphated, extending battery life. It is possible to charge batteries who's voltages differ from the primary system.
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