The Ultimate 140A Off Road Charging System comprises the CTEK D250SA, Battery Monitor and Smartpass 120 pack, and offers a powerful solution that is safe and flexible.The D250SA delivers 20A of power to charge, condition and maintain any 12V lead acid service battery while on the move. It is compatible with smart alternators, which means that the D250SA will still operate even if the alternator is shut off.The D250SA also has a built-in temperature sensor that compensates for hot or cold conditions. This ensures that your batteries are fully charged in the shortest possible time without the risk of over or under charging. In addition, it allows for direct connection to solar power sources without the need for a regulator. It features a Maximum Power Point Tracker (MPPT) to get the maximum power out of the solar panels.The separate CTEK Digital Battery Monitor Display constantly monitors the voltage and current (charge and discharge) to show you exactly how much charge you have and how many hours you've got left before your battery bank is empty.To complement the D250SA, the Smartpass 120 is a fully automatic 120A power management system that distributes power between the starter battery, the service battery, and your on-board equipment with the need for traditional diodes or VSR relays.The Smartpass 120 features Dynamic Over Current Protection, providing outputs of up to 350A for up to 10 seconds when powering equipment that require more than 120A. It also has Current Source priority function, wherein it will supply power to critical equipment directly from the alternator when the engine is running. This ensures that critical functions like starters, radios, emergency lights, and communication systems will always have the power needed.The Smartpass 120 can also assist in starting up your engine if the starter battery is flat by drawing power from the service battery. And with battery temperature protection, it switches off charging when the service battery gets too hot.This pack has a 2 year Australian Warranty and is without doubt the ideal system for anybody who has serious power requirements when travelling.Specification D250SA Charger Ambient operating temperature: -20 ˚C to +50 ˚C (- 4 °F to +122 °F) Positioning: Permanent installation / on board Warranty: 2 years Input: 11.5–23 V, 25 A Output: 14.4/14.7 V, 20 A Back current drain*: Corresponding to less than 1 Ah/month Battery types: 12 V:, WET, MF, Ca/Ca, AGM, EFB, GEL Battery capacity: 40–300 Ah Ingress protection: IP65 Smartpass 120S Power Management System Ambient operating temperature: -20 ˚C to +50 ˚C (- 4 °F to +122 °F) Positioning: Permanent installation / on board Warranty: 2 years Input: 11.5–23 V, 120 A (350 A temporarily for 10 seconds) Output: 120 A (350 A temporarily for 10 seconds) Back current drain*: Corresponding to less than 7 Ah/month Battery types: 12 V:, WET, MF, Ca/Ca, AGM, EFB, GEL Battery capacity: 28–800 Ah Ingress protection: IP65 Digital Battery Monitor Supply voltage: 8 - 16 Volts DC Supply current: 1.5 milliamps Battery capacities: 5 - 600 AMP Hour Load current: 199 A Maximum Charge current: 199 A Maximum Shunt Standard: 50 millivolt @ 100 AMPIN THE BOX 1x CTEK D250SA 1x CTEK Smartpass 120S 1x CTEK Digital Battery MonitorSKU: CTEK-40-256-289We accept Change of Mind returns for 14 days after you have received the item in cases where you have changed your mind or made an incorrect purchase and wish to return the product. This also applies to orders canceled when the item has already been dispatched from our warehouse. The item must be in a re-saleable condition to qualify for a change of mind refund. Deductions may apply including Initial and Return Shipping, as well as restocking fee of 10% of the product price