If you need an on-board battery charger with multiple battery packs, you can use very serious battery settings, which may include home batteries, starter batteries, towed motor batteries, and more. Multi-cell onboard battery chargers can save you a lot of time and frustration by rotating one or two battery pack chargers in the battery or bringing the battery charger to the boat every time you need to charge.
You're also smart because choosing a rotary multi-bank car charger, or trying to charge multiple batteries with a single charger at the same time, allows you to apply all the benefits of a modern charger maintainer to each battery based on your needs. In the long run, this could extend the life of each battery and save money.
Today's onboard multi-bank chargers are smart chargers with built-in microprocessors that control their multi-phase charging and maintenance processes, and may also include desulfurization and recovery functions. They can provide better battery performance and longer life. They may also allow you to automatically maintain all your batteries during the off-season, leaving your boat ready for spring.
What should you look for in a multi-bank car charger?
power
How much power do you need? The required output of a multi-library system is closely related to the application of each battery. Here is a quick guide to the amperage output of some applications:
o Low Output-(6 amps or less) The low output model may be suitable for maintenance use or any low amp hour battery application.
o Medium output-(9-15 amps) The medium output model is only suitable for trolling motors, only for medium or occasional weekends.
o High Output-(15 amps or higher) High output models will be used in high amp hour battery applications (such as 150 Ah) or any situation where repeated fast charging is required.
Use caution when selecting the amp output according to the instructions. Suppliers and manufacturers typically release amps in two ways. One way is to publish the total amps by multiplying the output of each bank by the number of banks. For example, they might post the output as 40 amps, but what they really tell you is that the charger produces 10 amps of output per library. Another more useful method is to publish the output by bank.
A common quick calculation method to determine how many amps output you need is to determine the ampere-hour rating for each battery and add them together. Then multiply this number by 10% to get the required amperage. For four 105 amp-hour batteries, for four battery chargers, you will need about 10% of 420 amp hours or 42 amps or about 10 amps per group.
battery voltage
Most marine systems are based on 12V or 24V batteries. Make sure your onboard battery charging system is selected to handle the battery voltage on board.
type of battery
Marine batteries can serve a variety of purposes on your boat, from startup to powering all major systems. In marine environments, you may encounter deep cycles, Gel Cel or AGM batteries.
Gel Cel batteries require a special charge curve, which can only be provided by models that specifically charge Gel Cel batteries. Car battery chargers that cannot charge AGM or deep cycle batteries alone cannot properly charge Gel Cel batteries. Be sure to choose a marine model that can handle all battery types.

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