Dual Pro Sportsman Series SS2 20A 2-Bank Marine Battery Charger

The Dual Pro Sportsman Series SS2 is the 2-bank, 20-amp marine battery charger from Dual Pro's Sportsman line - the lighter-weight, more affordable line designed to bring Dual Pro's trusted reliability and safety features to smaller boat installations and budget-conscious owners without sacrificing the core engineering quality that's made Dual Pro the OEM choice of most major boat builders.

Why a multi-bank charger vs a single-bank charger. Many boats have multiple batteries: a starting battery (for the engine), one or more trolling motor batteries (typically 24V or 36V systems requiring 2-3 separate batteries), and sometimes a separate house battery for accessories. Cheaper single-output chargers either (1) only charge one battery at a time (you have to manually swap cables between batteries), or (2) parallel-charge multiple batteries from one output (which works poorly because different batteries in different states of charge end up sharing one common voltage and the weaker batteries get under-charged while the stronger batteries get over-charged). A multi-bank charger like the SS2 has separate independent outputs for each battery, with each output managing its own bank through the proper bulk/absorption/float charging cycle independent of the others. Result: each battery gets the right charge for its individual state, maximizing battery life and ensuring reliable starting/operation.

The SS2 configuration. The SS2 is a 2-bank charger with 10 amps per bank (20 amps total). Most common use cases: (1) Boat with a cranking battery plus a single 12V trolling motor battery - one bank for each. (2) Boat with a 24V trolling motor system (two batteries wired in series) - one bank for each of the two batteries (must wire the charger banks to the individual batteries, not to the series-wired bank). For 36V trolling motor systems (3 batteries), step up to the SS3 with 3 banks. For 48V systems or higher-capacity installations needing more amperage per bank, the larger Pro Charging Systems (PCS) line is the upgrade path.

Battery type compatibility. The standard SS2 (this product) charges Wet Cell flooded lead-acid batteries and AGM batteries. The charger profiles are optimized for these two chemistries - bulk voltage, absorption voltage, and float voltage all set to the values these batteries need for proper charging. For Gelled Electrolyte (Gel) batteries, Dual Pro sells a separate variant of the Sportsman SS2 specifically for Gel chemistry (different model number) - Gel batteries need lower charging voltages than Wet Cell or AGM, so the wrong-chemistry charger will overcharge Gel batteries. Lithium batteries are NOT supported by the SS2 - lithium needs a lithium-specific charger profile that the SS2 doesn't have. Verify your battery type before ordering.

DeltaVolt Intuitive Charging Technology. Dual Pro's proprietary charging algorithm. The DeltaVolt technology continuously monitors the battery's voltage response to the charge current and intelligently adjusts the charging profile based on the actual battery state. This is more sophisticated than the basic timer-based charging algorithms in cheap chargers - DeltaVolt charges faster when the battery can accept more current and slower when the battery needs to taper, all automatically without operator intervention. Practical effect: dramatically faster charging when the battery is in good shape, gentler charging when the battery is older or partially sulfated, and better long-term battery health from optimal charge profiles applied to each charging cycle.

Fully waterproof construction. The SS2 is fully waterproof - rated to handle direct spray, immersion, and the wet bilge environments common on bass boats and trailerable fishing boats. Cheaper consumer-grade chargers are typically water-resistant at best, requiring careful mounting in dry areas. The Dual Pro waterproof construction lets you mount the charger anywhere on the boat including the bilge floor, under-deck wet compartments, or other locations where water exposure is inevitable. No installation restrictions on location due to weather exposure.

Zero spark technology. When you connect a charger output to a battery, the moment of contact can create a small spark - normally harmless, but a major ignition risk in compartments where fuel vapor may be present. The SS2's zero-spark technology delays the output voltage until proper polarity and battery connection are verified, eliminating the connection spark. Combined with the US Coast Guard 33 CFR 183.410 ignition protection certification and ISO 8846 marine standards compliance, the SS2 is approved for installation in any compartment of the boat including engine rooms and fuel-tank compartments where ignition protection is required.

Temperature compensation. The SS2 includes a built-in temperature sensor that adjusts charging voltages based on ambient temperature. Batteries need slightly different charging voltages at different temperatures: higher voltage in cold (battery resistance is higher), lower voltage in heat (to prevent overcharging in hot conditions). Temperature compensation is essential for maximizing battery life - chargers without it under-charge batteries in cold weather and over-charge in summer heat. The SS2's automatic temperature compensation handles this without operator adjustment.

LED state-of-charge indicators. Each bank has dedicated LED indicators that show the current charging state: bulk (high-current initial charge), absorption (voltage-limited finish charge), float (maintenance hold), and any fault conditions. Glance at the charger and you immediately know whether your batteries are charging, finishing, or held in maintenance mode - no guessing about whether the charger is actually doing anything. On-board diagnostic codes provide additional troubleshooting information for fault conditions (over-temperature, reverse polarity, battery disconnect, etc.).

Battery maintenance mode. After completing the bulk and absorption charge phases, the SS2 automatically transitions to maintenance mode - a low-current float charge that holds the battery at full charge without over-charging. This lets you leave the charger plugged in indefinitely during off-season storage or between fishing trips. Batteries left on Dual Pro chargers in maintenance mode typically arrive at the start of the next season fully charged and ready to use - eliminating the dead-battery surprise that plagues boats stored without chargers.

Physical and electrical specs. 4.75 inches tall x 8.00 inches wide x 9.25 inches long. 10.9 lb weight. 120V AC input (standard US household power). 12V or 24V battery system output. 5 ft DC charge cables to the batteries. 3 ft AC power cord to the wall outlet. FCC Parts A & B EMI compliant - won't generate interference with marine electronics. Reverse polarity protected at each output bank - hooking up the wires backward doesn't damage the charger.

Quality and support - the Dual Pro reputation. Dual Pro (Pro Charging Systems) has been the OEM marine charger supplier of choice to most major US boat builders for decades. The 750,000+ customer claim isn't marketing fluff - Dual Pro chargers are installed in production boats from manufacturers like Ranger, Triton, Skeeter, Phoenix, and many others, plus aftermarket sales to thousands of dealers. The 'Green Charger' designation indicates Dual Pro chargers are repairable rather than throw-away - if something fails, Dual Pro can service the unit rather than requiring complete replacement. Customer service operates from Dual Pro's Nashville facility with strong reputation for technical support.

What's in the box. Dual Pro SS2 charger unit, 5 ft DC charge cables (one set per bank, with battery terminal ring connectors), 3 ft AC power cord with standard US three-prong plug, mounting hardware, basic install documentation. The unit is ready for direct installation - no additional purchases required beyond ring terminals if you need to add to existing battery terminal lugs.

Warranty. Dual Pro warranty terms - check current warranty policy on Dual Pro's website at purchase. Dual Pro has well-established warranty service from their US-based Nashville facility with strong reputation for honoring warranty claims promptly.