Shipping Weight: 6 pounds
This 2-battery-charger system features a high level of charging capability. Used together, these chargers can keep a combination of 12V starter battery and 12V service batteries at peak charge. Chargers use power from up to 2 DC power sources.
When used together, the CTEK D250S DUAL battery charger and SmartPass enhancement can meet your most challenging and difficult battery charging needs. They provide a high degree of versatility for complex charging situations.
Designed for use where AC power is unavailable, these chargers are great for use at marinas and rural properties. You just need a solar panel or wind generator to provide a source of electric power. These chargers are good for boats, RVs, campers and trucks. And don't worry about batteries losing their charge in a machine that is left unattended for months. With these chargers on the job, the batteries will be ready to go when you are.
This two-charger set can charge high-capacity service batteries and banks of service batteries. They handle the high output of heavy-duty alternators. This high-capacity capability means that these chargers can match the demands of a large number of electrical devices.
These chargers coordinate input power from as many as two 12V sources, allowing your alternator and another source, such as a solar panel, to provide power at the same time. These CTEK chargers will automatically select the best input source for charging your batteries. And with maximum power point tracking, a built-in feature, they make the most efficient use of solar panels. If AC power is available, you can add an AC/DC charger to these two chargers for even greater versatility and charging power.
Sophisticated charging process protects batteries and electronics and provides the most efficient charging possible. By separating starter and service batteries, only the battery needing a charge takes any power. Separating the service battery from the devices that it powers (that is, consumers) ensures that none of the electric power intended for the battery is drawn off by the consumers. And you can separate critical electronics like radios and navigation equipment from non-critical ones like marine refrigerators. This cuts power to the non-critical devices to make sure that the critical devices continue to operate if the service battery charge gets low.
A goof-proof design distinguishes CTEK's new-generation chargers from the competition - you don't have to be a mechanical guru to keep your battery working at top efficiency. CTEK's patented charging system monitors your battery, providing exactly the charge it needs during each unique charging stage. These chargers use CTEK's automatic switch-mode, pulse-maintenance technology to keep 12V service batteries (including banks of batteries with high parallel loads) and a 12V starter battery at peak charge. This battery charging process keeps your batteries fully charged and maximizes battery life.
CTEK's patented switch-mode, pulse-maintenance charging system is designed with the most up-to-date technology to safely charge your battery. Using carefully monitored, low-grid voltage, CTEK's patented process differs from competitors' chargers by providing the precise final voltage that your battery needs to maintain the optimum charge level. This sophisticated, interactive device will never overcharge or undercharge your battery. You can leave it attached to the battery for months, making it perfect for seasonal vehicle storage.
Overcharging can cause gassing, which can lead to acid concentration and corrosion of the battery's lead plates. It can also cause the battery cells to dry out ("boil dry"), which can allow the battery to overheat and cause a fire.
Undercharging can be just as damaging to your battery as overcharging because chronic undercharging leads to sulfation. Sulfation occurs when the lead and lead dioxide of the battery's plates react with sulfuric battery acid to produce lead sulfate. This, in turn, is converted back to lead, lead oxide and sulfuric acid. A small, unavoidable amount of sulfation and gassing naturally takes place as a result of the chemical processes occurring in lead-acid batteries. However, extensive undercharging causes extra lead sulfate to accumulate on the lead plates of the battery. Because the crystalline form of the sulfate cannot hold an electrical charge, excessive sulfation greatly diminishes the charging ability of the battery, eventually rendering it unusable.
Desulfation is the reversal of sulfation damage. The CTEK charger's unique process not only prevents the undercharging that produces excess sulfation, but it also includes a desulfating step that can often "revive" a lightly sulfated battery. It accomplishes this with carefully monitored electronic pulses of energy that help to break down the lead sulfate crystals, allowing the battery to once again accept a charge.
Ripple-wave percentage is the quantity of disturbances exhibited in current and voltage. CTEK's low-ripple design regulates the incoming current before passing it on to your battery, ensuring a consistent charge. Unlike an old-style charger, this CTEK charger maintains precise control over the output current, keeping a battery healthier, more productive and longer lasting.
The charger uses sophisticated circuitry that is designed to be compatible with today's sensitive electronics and audio equipment. CTEK's low ripple rate eliminates the danger of damage to electronic devices that are connected to the battery, and it prolongs the battery's service life.
This illustration shows the SmartPass in use with the D250S DUAL, a SmartPass and an AC/DC charger all being used at the same time to charge a starter and a service battery. Input power is coming from a solar panel, an alternator and an AC/DC charger. Critical and non-critical electrical devices are connected separately.
Easy-to-read indicator lights on both the D250S DUAL and the SmartPass keep you informed of the charging process and of any error conditions.
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