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CTEK D250SA 12V 20A On-Board Dual Battery Charger DC to DC with built-in solar regulator - Smart Alternator Compatible

CTEK D250SA 12V 20A On-Board Dual Battery Charger DC to DC



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Information About This Item

Taking On-Board Battery Charging to Another Level


If you spend a lot of time off the beaten track with limited access to mains power, a reliable on-board battery charging system is a valuable asset to have in your vehicle – and the CTEK D250SA is certainly a wise choice.

Replacing the popular CTEK D250S, the new D250SA is an intelligent, on-board 5-stage battery charger with a consistent 20A output that gives users great flexibility when charging and maintaining secondary batteries whilst on the move, whether it be from the vehicle’s alternator or solar power.

Works with All 12V Lead Acid Batteries
The CTEK D250SA is compatible with all 12V lead acid batteries, including GEL and thanks to the user-selectable charge voltages, the D250SA is optimised for AGM batteries as well, boosting output from 14.4V to 14.7V to suit.

Smart Alternator Compatibility
Keeping up with all the latest efficiency-driven vehicle technological upgrades, the D250SA is fully compatible with newer vehicles fitted with ECU controlled 'smart alternators', able to work alongside this system to provide the secondary service battery with optimal charge.

Built for Harsh Aussie Conditions
With it's own, built-in Temperature sensor the D250SA will increase voltage during cold weather and reduces the charge in hot weather for efficient and risk-free charging, no matter where you find yourself ending up.

Take Full Advantage of Solar Power
The D250SA and solar power goes hand-in-hand to further expand the functionality of this great battery charger, with a built-in solar regulator and Maximum Power Point Tracker (MPPT) ensuring maximum power is being generated from the connected solar panel. In addition to this, the unit can also provide a maintenance charge to the vehicle's primary starter battery from the solar panel or the secondary service battery for added piece of mind - We did tell you it was a SMART charger! d250sa-dual-battery-charger-on-board-20a-install-frankies.jpg

Add the CTEK Smart Pass for the Ultimate On-Board Dual Battery Management System
While the D250SA is a very capable and proven unit on its own, when combined with the CTEK SMARTPASS120 they provide users with one of, if not the BEST on-board dual battery power management system on the market, especially for batteries over 100Ah. Together, these intelligent units are able to deliver up to 140A to your secondary service batteries while you’re on the move.



  • A 5-step charger to quickly charge up your service batteries from a range of power sources
  • Smart alternator compatible
  • Built-in Solar regulator
  • Advanced built-in Maximum Power Point Tracker (MPPT) - maximising the power from your solar panels
  • Special AGM function - Selectable 14.7V for AGM batteries \  14.4V option for other batteries
  • Temperature compensation


  • Input: 11.5 - 23V \ 25A
  • Output: Max 14.4V (14.7V in AGM), 20A
  • Back Current Drain: < 1Ah/Month
  • Ambient Temperature: -20°C to 50°C
  • Battery Types: All types on 12V Lead Acid batteries (WET, EFB, Ca/Ca, MF, AGM & GEL)
  • Battery Capacity: 40-300Ah
  • Dimensions: 192x110x65mm (LxWxH)
  • Protection Class: IP65 (splash & dust proof) 

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Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund less a 20% re-stocking fee and any shipping costs which are unable to be retrieved. Frankies will pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

The balance of the refund will be issued as a store credit for purchase of your next product or paid directly back into your PayPal account. You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

To organise a return of an item, please contact the store the purchase was made from, either via phone, email or dropping into the store.


Frankies offer $9 FLAT RATE Australia-wide shipping, no matter the number of items however, some larger/heavier items may incur a higher fee which will be noted during the checkout procedure. Frankies do not ship to PO Boxes, Parcel Lockers or addresses outside of Australia

Warranty - Genuine Australian Stock


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