DC-DC Battery Chargers

A DC-DC battery charger charges a battery from a DC source rather than from mains power. That distinction defines the category and its uses. A vehicle charges its auxiliary battery from its starter system while driving. A boat charges its house battery from its engine alternator while under way. An off-grid installation charges a storage battery from a DC bus. In each case the charger must manage the charging profile of the battery chemistry it serves, and it must do so while the source voltage moves with engine speed, load, and charge state.

The category lists seven lines: chargers for 12 volt, 16 volt, 24 volt, 36 volt and 48 volt lithium batteries, a bidirectional battery charger, and a lead-acid battery charger. Those lines are category-level listings, which means the battery voltages and chemistries are stated and no charging currents or power ratings are claimed for them here, with one exception: the bidirectional line carries a full published specification and has its own detail page.

The exception is the WG-BC1500M bidirectional battery charger series, whose detail page states that it is waterproof, moves energy in both directions, communicates over RS485, supports charging while the engine is running, and serves 12 volt, 24 volt, 36 volt and 48 volt lithium and AGM batteries. The stated application areas for that series are drones, marine use, industrial use, telecom, new energy vehicles, solar energy storage, unmanned aerial vehicles, and vehicle-mounted power systems. Those figures and applications belong to that series alone and are not shared with any other charger in this category.

Battery chemistry is the first choice a buyer must make in this category, and it cannot be fudged. A lithium battery and a lead-acid battery charge at different voltages, accept different charging profiles, and tolerate different treatment at full charge. A charger built for one chemistry must not be assumed to serve the other, and a charger that claims both must state both, as the bidirectional series does for lithium and AGM. The selection pages for lithium charging and for 12 volt charging work through that choice in detail.

The second choice is system voltage. A 12 volt charger serves the most common auxiliary systems, while 24 volt, 36 volt and 48 volt chargers serve larger vehicles, vessels, and energy installations. The buying guide for 24 volt and 48 volt chargers explains how to match the charger to the battery bank rather than to the source, since the battery voltage is the figure the charger must satisfy.

For chargers other than the bidirectional series, charging current, dimensions, and other performance figures are confirmed during the inquiry, together with quantity, price and delivery time. Certificates are available upon request.