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The CTEK 140A Off Road Bundle combines the CTEK D250SA Smart Charger and the CTEK Smartpass 120 Complete Management Unit. This system will provide your 4WD, van, RV, or other off-grid vehicles with 140 Amps of charging power, enough to keep your batteries charged and ready. 

Whether you are a Do-it-Yourself person or not, this video from Andy gives an excellent step-by-step of how to install the D250SA and Smartpass in your van, RV, or other offgrid vehicle.