CTEK DS DUAL D.C Charger – DC/DC solution for operational charging The DS DUAL charger obtains its energy from DC sources such as alternators. The CTEK DS Dual DC-DC charger will charge, condition and maintain your dual battery system, with the ability to charge from both your alternator while. Why won’t my CTEK DS Dual Charge from Solar Panels? The CTEK D DC-DC Charger will also charge from solar panels while it is getting input from.

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Easy-to-read indicator lights keep you informed of SmartPass charging actions and alert you to any problems that may develop. Conditions must be perfect while using solar power for If the trailer has a solar panel or other charging system on it the SmartPass would be best on the trailer for sure.

Info for this part was: All CTEK battery chargers are set up so they will never overcharge the batteries. D2550s you have a question about this Accessories and Part? Does include the charger right here.

Unfortunately we don’t carry that updated model, but I have confirmed compatibility with the manufacturer for you. Customers compare CTEK to these similar products. Additionally, If there is no input charge from the tow vehicle and the trailer battery is being fual, the tow vehicle’s battery is not going to be drained.


Please read our Returns Policy for more information. This will protect your main starting battery from auxilary drain and regulate current for multi-battery systems.

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Will work on trucks, campers, RVs, 4-wheel drives, boats and tractors. Separates Critical from Non-Critical Electrical Devices The SmartPass also protects the power to critical electrical devices by separating them from non-critical equipment such as marine refrigerators.

Higher Output Rating The SmartPass can provide a higher amperage charge rate which it would receive from an alternator with higher output to handle more demanding service batteries and banks of batteries.

CTEK DS 12 Volt 20 Amp DC to DC Dual Charger

cte, This item qualifies for Free Shipping. You will also want to use a 30 amp fuse instead of a 25 amp before the solar panel input. The width is about four-and-a-quarter inches wide. But by adding a SmartPass you can: It will keep 12V starter and 12V service batteries at peak charge.


The SmartPass warns you if the charge on the service battery gets low. We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions. Things to be Tcek of When Charging a Battery from an Alternator The biggest thing to be aware of is that your alternator will more or less provide just a maintenance charge for your batteries.


It’s designed to charge multiple batteries from multiple sources and if one battery is topped off it would not continue to charge it and it would then apply the current to the other battery.

I have attached a diagram showing how this setup would work for you; I’ve also attached a review video of the SmartPass Unit for you to take a look at. If you want to actually charge the battery of the trailer from a depleted state you would need heavier gauge wire than 10 gauge.

CTEK D250S Dual Input Battery Charger

Now, this is even for housing that rely on generators for power. Keeps You Informed Easy-to-read indicator lights keep you informed of SmartPass charging actions and alert you to any problems that may develop. To answer your questions, the negative from the altenator will not come into play and should stay grounded to the vehicle. Either way, it sounds like the solar panel was connected directly to d520s batteries.

Product Experts Available Now! The cables on it has an eyelet terminal right here that connects to the negative cable.